-----------------------------------------------------------------------
  **MSFC PRACA : 2003-02-12 08:41**

  -----------------------------------------------------------------------

  -----------------------------------------------------------------------
  MSFC Problem Reporting and Corrective Action (PRACA) System

  WHOLE RECORD REPORT( + ADDENDUM)
  -----------------------------------------------------------------------

+-------------+---------------+-----------+-----------+------+--------+
| **MSFC      | **In-Flight   | **C       | **JSC#**\ | *    |        |
| Record      | Anomaly       | ontractor | \--       | *KSC |        |
| \#**\       | Number**\     | Report    |           | #**\ |        |
| A17695      | \--           | Number**\ |           | \--  |        |
|             |               | S-087     |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Problem   |               |           |           |      |        |
| Title**\    |               |           |           |      |        |
| ET-117 LH2  |               |           |           |      |        |
| TANK POST   |               |           |           |      |        |
| PROOF       |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **EICN#**\  | **ELEMENT**\  | **Cont    | *         | **   |        |
| \--         | ET            | ractor**\ | *FSCM#**\ | FCRI |        |
|             |               | LOCKHEED  | \--       | T**\ |        |
|             |               | MARTIN    |           | 3    |        |
+-------------+---------------+-----------+-----------+------+--------+
| **HCRIT**\  | **Sys_Lvl**\  | **Misc    |           |      |        |
| 1           | \--           | Codes**\  |           |      |        |
|             |               | A B C D E |           |      |        |
|             |               | F G H I J |           |      |        |
|             |               | K L M N O |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **          | **NO          | *         | **SE      | *    |        |
| HARDWARE**\ | MENCLATURE**\ | *PART#**\ | R/LOT#**\ | *MAN |        |
| EIM         | \--           | \--       | \--       | UFAC |        |
|             |               |           |           | TURE |        |
|             |               |           |           | R**\ |        |
|             |               |           |           | \--  |        |
+-------------+---------------+-----------+-----------+------+--------+
| **          | **NO          | *         | **SE      | *    |        |
| HARDWARE**\ | MENCLATURE**\ | *PART#**\ | R/LOT#**\ | *MAN |        |
| LRU         | \--           | \--       | \--       | UFAC |        |
|             |               |           |           | TURE |        |
|             |               |           |           | R**\ |        |
|             |               |           |           | \--  |        |
+-------------+---------------+-----------+-----------+------+--------+
| **          | **NO          | *         | **SE      | *    |        |
| HARDWARE**\ | MENCLATURE**\ | *PART#**\ | R/LOT#**\ | *MAN |        |
| NCA         | LH2 TANK POST | 809140    | 1131190   | UFAC |        |
|             | PROOF         | 04000-519 |           | TURE |        |
|             |               |           |           | R**\ |        |
|             |               |           |           | MAF  |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Test/O    | **Prevailing  | **F /     | **Fail    | **   |        |
| peration**\ | Condtion**\   | U**\      | Mode**\   | Caus |        |
| M - MFG     | N -           | F         | MS -      | e**\ |        |
|             | INSPECTION    |           | STRUCT    | MW - |        |
|             |               |           |           | MFG- |        |
|             |               |           |           | WORK |        |
+-------------+---------------+-----------+-----------+------+--------+
| **System**\ | **Defect**\   | **Ma      | **Work    | **   |        |
| PRESSURE    | DC - BROKEN   | terial**\ | C         | Fail |        |
| VES         |               | S -       | ontact**\ | Dat  |        |
|             |               | STRUCT    | W.M       | e**\ |        |
|             |               |           | ATHEESSEN | 06   |        |
|             |               |           |           | /08/ |        |
|             |               |           |           | 2001 |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Received  | **Date        | **FMEA    | **IFA:    | *    |        |
| at MSFC**\  | Isolated**\   | Ref       | Mission   | *Mis |        |
| 06/11/2001  | 06/08/2001    | erence**\ | Phase**\  | sion |        |
|             |               | \--       | \--       | Ela  |        |
|             |               |           |           | psed |        |
|             |               |           |           | Tim  |        |
|             |               |           |           | e**\ |        |
|             |               |           |           | \--  |        |
+-------------+---------------+-----------+-----------+------+--------+
| **          |               | **S       |           | **   |        |
| Location**\ |               | ymptom**\ |           | Time |        |
| MAF         |               | MS -      |           | Cycl |        |
|             |               | STRUCT    |           | e**\ |        |
|             |               |           |           | \--  |        |
+-------------+---------------+-----------+-----------+------+--------+
| **          |               |           |           |      |        |
| Effectivity |               |           |           |      |        |
| Text**\     |               |           |           |      |        |
| \--         |               |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Vehicle   |               |           |           |      |        |
| Effectivity |               |           |           |      |        |
| Codes**     |               |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Vehicle   | **Vehicle     | **Vehicle | **Vehicle | *    |        |
| 1**\        | 2**\          | 3**\      | 4**\      | *Veh |        |
| \--         | \--           | \--       | \--       | icle |        |
|             |               |           |           | 5**\ |        |
|             |               |           |           | \--  |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Mission   |               |           |           |      |        |
| Effectivity |               |           |           |      |        |
| Codes**     |               |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Mssn 1**\ | **Mssn 2**\   | **Mssn    | **Mssn    | **   |        |
| \--         | \--           | 3**\      | 4**\      | Mssn |        |
|             |               | \--       | \--       | 5**\ |        |
|             |               |           |           | \--  |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Estimated |               |           |           |      |        |
| Completion  |               |           |           |      |        |
| Dates**     |               |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **MSFC      | **Contractor  | **LVL 3   | **Remark  |      |        |
| Approved    | Req Defer     | Close**\  | /         |      |        |
| Defer Until | Until Date**\ | \--       | Action**\ |      |        |
| Date**\     | \--           |           | \--       |      |        |
| \--         |               |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **In        |               |           |           |      |        |
| vestigation |               |           |           |      |        |
| /           |               |           |           |      |        |
| Resolution  |               |           |           |      |        |
| Summary**   |               |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Last MSFC | **CN RSLV     | **Defer   | **Add     | *    |        |
| Update**\   | SBMT**\       | Date**\   | Date**\   | *R/C |        |
| 02/01/2002  | \--           | \--       | 0         | Code |        |
|             |               |           | 6/12/2001 | s**\ |        |
|             |               |           |           | 2 -  |        |
|             |               |           |           | MFG  |        |
|             |               |           |           | 4 -  |        |
|             |               |           |           | TEST |        |
|             |               |           |           | \--  |        |
+-------------+---------------+-----------+-----------+------+--------+
| *           |               |           |           |      |        |
| *Assignee** |               |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Design**\ | **Chief       | **S &     | **P       | *    |        |
| M. BUTLER   | Engineer**\   | MA**\     | roject**\ | *Pro |        |
|             | N. OTTE       | K. LAYNE  | \--       | ject |        |
|             |               |           |           | MG   |        |
|             |               |           |           | R**\ |        |
|             |               |           |           | J.   |        |
|             |               |           |           | SME  |        |
|             |               |           |           | LSER |        |
+-------------+---------------+-----------+-----------+------+--------+
| *           |               |           |           |      |        |
| *Approval** |               |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Design**\ | **Chief       | **S &     | **P       | *    |        |
| M. BUTLER   | Engineer**\   | MA**\     | roject**\ | *Pro |        |
|             | N. OTTE       | K. LAYNE  | \--       | ject |        |
|             |               |           |           | MG   |        |
|             |               |           |           | R**\ |        |
|             |               |           |           | J.   |        |
|             |               |           |           | SME  |        |
|             |               |           |           | LSER |        |
+-------------+---------------+-----------+-----------+------+--------+
| **PAC       | **PAC Review  | **MSFC    | **        | *    |        |
| Assignee**\ | Complete**\   | Closure   | Status**\ | *F/A |        |
| T. WHITE    | TW            | Date**\   | C -       | C    |        |
|             |               | 0         | CLOSED    | ompl |        |
|             |               | 1/31/2002 |           | etio |        |
|             |               |           |           | n**\ |        |
|             |               |           |           | \--  |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Problem   | **SEV**\      | **Program | **REVL**\ | **O  |        |
| Type**\     | \--           | Name**\   | \--       | PRIN |        |
| \--         |               | \--       |           | C**\ |        |
|             |               |           |           | \--  |        |
+-------------+---------------+-----------+-----------+------+--------+
| **FUNC      | **Software    | *         |           | **SU | **So   |
| MOD**\      | E             | *Software |           | BTYP | ftware |
| \--         | ffectivity**\ | Fail      |           | E**\ | C      |
|             | \-- \-- \--   | CD**\     |           | \--  | losure |
|             | \-- \--       | \--       |           |      | CD**\  |
|             |               |           |           |      | \--    |
+-------------+---------------+-----------+-----------+------+--------+
| **RES       | **Approval    |           |           |      |        |
| PERSON      | Signature     |           |           |      |        |
| L2**\       | L3**\         |           |           |      |        |
| \--         | \--           |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Related   | **Related     |           |           |      |        |
| Document    | Document      |           |           |      |        |
| Type**\     | ID**\         |           |           |      |        |
| \--         | N055015       |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Related   |               |           |           |      |        |
| Document    |               |           |           |      |        |
| Title**\    |               |           |           |      |        |
| NCD         |               |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Related   | **Related     |           |           |      |        |
| Document    | Document      |           |           |      |        |
| Type**\     | ID**\         |           |           |      |        |
| \--         | \--           |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Related   |               |           |           |      |        |
| Document    |               |           |           |      |        |
| Title**\    |               |           |           |      |        |
| \--         |               |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Related   | **Related     |           |           |      |        |
| Document    | Document      |           |           |      |        |
| Type**\     | ID**\         |           |           |      |        |
| \--         | \--           |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Related   |               |           |           |      |        |
| Document    |               |           |           |      |        |
| Title**\    |               |           |           |      |        |
| \--         |               |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| *           |               |           |           |      |        |
| *Contractor |               |           |           |      |        |
| Status      |               |           |           |      |        |
| Summary**   |               |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Reliabil  |               |           |           |      |        |
| ity/Quality |               |           |           |      |        |
| Assurance   |               |           |           |      |        |
| Concerns,   |               |           |           |      |        |
| Recomme     |               |           |           |      |        |
| ndations:** |               |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **Problem   |               |           |           |      |        |
| De          |               |           |           |      |        |
| scription** |               |           |           |      |        |
|             |               |           |           |      |        |
| DURING POST |               |           |           |      |        |
| PROOF       |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| OF THE LH2  |               |           |           |      |        |
| TANK FOR    |               |           |           |      |        |
| ET-117, TWO |               |           |           |      |        |
|             |               |           |           |      |        |
| CRACKS WERE |               |           |           |      |        |
| FOUND ON    |               |           |           |      |        |
| RIBS C-35 & |               |           |           |      |        |
| C-37        |               |           |           |      |        |
| (BARREL #3) |               |           |           |      |        |
| NEXT TO THE |               |           |           |      |        |
| S-12        |               |           |           |      |        |
|             |               |           |           |      |        |
| STRINGER ON |               |           |           |      |        |
| THE ISL. A  |               |           |           |      |        |
| HELIUM LEAK |               |           |           |      |        |
| CHECK WAS   |               |           |           |      |        |
| PERFORMED   |               |           |           |      |        |
| ON JUNE 8,  |               |           |           |      |        |
|             |               |           |           |      |        |
| 2001, AND A |               |           |           |      |        |
| LEAK        |               |           |           |      |        |
| CONDITION   |               |           |           |      |        |
| WAS         |               |           |           |      |        |
| IDENTIFIED. |               |           |           |      |        |
| FURTHER     |               |           |           |      |        |
| EVALUATION  |               |           |           |      |        |
| OF THE      |               |           |           |      |        |
|             |               |           |           |      |        |
| HELIUM LEAK |               |           |           |      |        |
| CHECK,      |               |           |           |      |        |
| DETERMINED  |               |           |           |      |        |
| THAT THE    |               |           |           |      |        |
| LEAK        |               |           |           |      |        |
| INDICATION  |               |           |           |      |        |
| FOR C35 WAS |               |           |           |      |        |
| 0.3         |               |           |           |      |        |
|             |               |           |           |      |        |
| X 10\^-7    |               |           |           |      |        |
| ATM-CC/SEC  |               |           |           |      |        |
| AND FOR C37 |               |           |           |      |        |
| WAS 1.1 X   |               |           |           |      |        |
| 10\^-6      |               |           |           |      |        |
| ATM-CC/SEC. |               |           |           |      |        |
| WHEN THE    |               |           |           |      |        |
|             |               |           |           |      |        |
| TANK WAS    |               |           |           |      |        |
| LEAK        |               |           |           |      |        |
| CHECKED     |               |           |           |      |        |
| WITH        |               |           |           |      |        |
| NITROGEN IN |               |           |           |      |        |
| BLDG. 451   |               |           |           |      |        |
| AT 6        |               |           |           |      |        |
|             |               |           |           |      |        |
| PSI NO LEAK |               |           |           |      |        |
| WAS         |               |           |           |      |        |
| DETECTED.   |               |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| *           |               |           |           |      |        |
| *Contractor |               |           |           |      |        |
| Inve        |               |           |           |      |        |
| stigation/R |               |           |           |      |        |
| esolution** |               |           |           |      |        |
|             |               |           |           |      |        |
| 0           |               |           |           |      |        |
| 6/11/2001 - |               |           |           |      |        |
| CONTRACTOR  |               |           |           |      |        |
| SUBMITTED   |               |           |           |      |        |
| PROBLEM     |               |           |           |      |        |
| REPORT      |               |           |           |      |        |
| OPENER AS   |               |           |           |      |        |
| FOLLOWS:    |               |           |           |      |        |
|             |               |           |           |      |        |
| GENERAL:    |               |           |           |      |        |
|             |               |           |           |      |        |
| DURING      |               |           |           |      |        |
| PERFORMANCE |               |           |           |      |        |
| OF THE      |               |           |           |      |        |
| ET-117 LH2  |               |           |           |      |        |
| TANK POST   |               |           |           |      |        |
| PROOF       |               |           |           |      |        |
| SHAKEDOWN   |               |           |           |      |        |
|             |               |           |           |      |        |
| INSPECTION, |               |           |           |      |        |
| TWO CRACKS  |               |           |           |      |        |
| WERE        |               |           |           |      |        |
| VISUALLY    |               |           |           |      |        |
| IDENTIFIED  |               |           |           |      |        |
| ON RIBS     |               |           |           |      |        |
| C-35 & C-37 |               |           |           |      |        |
|             |               |           |           |      |        |
| NEXT TO THE |               |           |           |      |        |
| S-12        |               |           |           |      |        |
| STRINGER ON |               |           |           |      |        |
| THE ISL.    |               |           |           |      |        |
| THE CRACKS  |               |           |           |      |        |
| ARE LOCATED |               |           |           |      |        |
| WHERE THE   |               |           |           |      |        |
|             |               |           |           |      |        |
| RIBS        |               |           |           |      |        |
| TRANSITION  |               |           |           |      |        |
| INTO THE    |               |           |           |      |        |
| WELD LAND   |               |           |           |      |        |
| AND THE     |               |           |           |      |        |
| THROUGH THE |               |           |           |      |        |
| \"DUTTON\"  |               |           |           |      |        |
|             |               |           |           |      |        |
| GROOVE.     |               |           |           |      |        |
| THIS IS     |               |           |           |      |        |
| NEXT TO THE |               |           |           |      |        |
| HB3-8 WELD  |               |           |           |      |        |
| AT STATION  |               |           |           |      |        |
| 1377, ON    |               |           |           |      |        |
| BARREL \#   |               |           |           |      |        |
|             |               |           |           |      |        |
| 3\.         |               |           |           |      |        |
| SUBSEQUENT  |               |           |           |      |        |
| IN          |               |           |           |      |        |
| VESTIGATION |               |           |           |      |        |
| HAS SHOWN   |               |           |           |      |        |
| THAT THE    |               |           |           |      |        |
| CRACK ON    |               |           |           |      |        |
| C-37 WAS    |               |           |           |      |        |
|             |               |           |           |      |        |
| VISIBLE ON  |               |           |           |      |        |
| THE OSL.    |               |           |           |      |        |
| HOWEVER,    |               |           |           |      |        |
| THERE WAS   |               |           |           |      |        |
| NO EVIDENCE |               |           |           |      |        |
| ON THE OSL  |               |           |           |      |        |
| OF AN       |               |           |           |      |        |
|             |               |           |           |      |        |
| IMPACT THAT |               |           |           |      |        |
| COULD HAVE  |               |           |           |      |        |
| CAUSED THE  |               |           |           |      |        |
| DAMAGE.     |               |           |           |      |        |
|             |               |           |           |      |        |
| C-35 (#1)   |               |           |           |      |        |
| C-37 (#2)   |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-\-      |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
| \-\-\-      |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| X-RAY       |               |           |           |      |        |
| LENGTH      |               |           |           |      |        |
| 1.025\"     |               |           |           |      |        |
| 1.225\"     |               |           |           |      |        |
|             |               |           |           |      |        |
| UT          |               |           |           |      |        |
| REMAINING   |               |           |           |      |        |
| LIGAMENT    |               |           |           |      |        |
| 0.100\" 0.0 |               |           |           |      |        |
| -VISUAL     |               |           |           |      |        |
| THRU WALL   |               |           |           |      |        |
|             |               |           |           |      |        |
| VISUAL -    |               |           |           |      |        |
| NCD LENGTH  |               |           |           |      |        |
| 1.000\"     |               |           |           |      |        |
| 1.100\"     |               |           |           |      |        |
|             |               |           |           |      |        |
| VISUAL -    |               |           |           |      |        |
| NCD WIDTH   |               |           |           |      |        |
| 0.125\"     |               |           |           |      |        |
| 0.125\"     |               |           |           |      |        |
|             |               |           |           |      |        |
| THE CRACK   |               |           |           |      |        |
| ON C-37     |               |           |           |      |        |
| APPEARS TO  |               |           |           |      |        |
| RUN FROM    |               |           |           |      |        |
| THE ISL TO  |               |           |           |      |        |
| THE OSL     |               |           |           |      |        |
| LEAVING A   |               |           |           |      |        |
|             |               |           |           |      |        |
| DIMPLE AND  |               |           |           |      |        |
| CRACK ON    |               |           |           |      |        |
| THE OSL.    |               |           |           |      |        |
|             |               |           |           |      |        |
| PANEL ID    |               |           |           |      |        |
| #\'S        |               |           |           |      |        |
|             |               |           |           |      |        |
| \           |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| DESCRI      |               |           |           |      |        |
| PTION/STATE |               |           |           |      |        |
| PART \#     |               |           |           |      |        |
| SERIAL \#   |               |           |           |      |        |
|             |               |           |           |      |        |
| TRIM LOG    |               |           |           |      |        |
| 80911       |               |           |           |      |        |
| 4400940M509 |               |           |           |      |        |
| OP1 1042590 |               |           |           |      |        |
|             |               |           |           |      |        |
| DELIVERED   |               |           |           |      |        |
| PART        |               |           |           |      |        |
| (FORMED)    |               |           |           |      |        |
| 80911       |               |           |           |      |        |
| 4400930-502 |               |           |           |      |        |
| 0000024     |               |           |           |      |        |
|             |               |           |           |      |        |
| MACHINED    |               |           |           |      |        |
| 80911       |               |           |           |      |        |
| 4400920-502 |               |           |           |      |        |
| 0000023     |               |           |           |      |        |
|             |               |           |           |      |        |
| INITIAL     |               |           |           |      |        |
| IN          |               |           |           |      |        |
| VESTIGATION |               |           |           |      |        |
| HAS SHOWN   |               |           |           |      |        |
| THAT THE    |               |           |           |      |        |
| RIBS &      |               |           |           |      |        |
| STRINGERS   |               |           |           |      |        |
| ARE THE     |               |           |           |      |        |
|             |               |           |           |      |        |
| PROPER      |               |           |           |      |        |
| THICKNESS.  |               |           |           |      |        |
| IN          |               |           |           |      |        |
| ADDITION,   |               |           |           |      |        |
| THE WEB     |               |           |           |      |        |
| THICKNESS   |               |           |           |      |        |
| WAS         |               |           |           |      |        |
| MEASURED    |               |           |           |      |        |
| AND         |               |           |           |      |        |
|             |               |           |           |      |        |
| MEETS       |               |           |           |      |        |
| ENGINEERING |               |           |           |      |        |
| RE          |               |           |           |      |        |
| QUIREMENTS. |               |           |           |      |        |
|             |               |           |           |      |        |
| TASK I      |               |           |           |      |        |
| FAIL        |               |           |           |      |        |
| URE/PROBLEM |               |           |           |      |        |
| IN          |               |           |           |      |        |
| VESTIGATION |               |           |           |      |        |
|             |               |           |           |      |        |
| A. DEVELOP  |               |           |           |      |        |
| AND CLOSE   |               |           |           |      |        |
| FAULT TREE. |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
|             |               |           |           |      |        |
| MATERIALS   |               |           |           |      |        |
| TASK LEAD   |               |           |           |      |        |
|             |               |           |           |      |        |
| D. BOLSTAD  |               |           |           |      |        |
| / D4600 -   |               |           |           |      |        |
| P.          |               |           |           |      |        |
| HINKELDEY / |               |           |           |      |        |
| D4600       |               |           |           |      |        |
|             |               |           |           |      |        |
| DESIGN TASK |               |           |           |      |        |
| LEAD        |               |           |           |      |        |
|             |               |           |           |      |        |
| J. PILET /  |               |           |           |      |        |
| D4130 - F.  |               |           |           |      |        |
| MANTO /     |               |           |           |      |        |
| D4100       |               |           |           |      |        |
|             |               |           |           |      |        |
| OVERLOAD /  |               |           |           |      |        |
| FABRICATION |               |           |           |      |        |
| TASK LEAD   |               |           |           |      |        |
|             |               |           |           |      |        |
| M. QUIGGLE  |               |           |           |      |        |
| / D3000     |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/25/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| B. PERFORM  |               |           |           |      |        |
| FAILURE     |               |           |           |      |        |
| ANALYSIS AT |               |           |           |      |        |
| THE REQUEST |               |           |           |      |        |
| OF FAULT    |               |           |           |      |        |
| TREE        |               |           |           |      |        |
|             |               |           |           |      |        |
| TEAM.       |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| D.          |               |           |           |      |        |
| BOLS        |               |           |           |      |        |
| TAD/D4600 - |               |           |           |      |        |
| P.          |               |           |           |      |        |
| HINKELDEY / |               |           |           |      |        |
| D4600       |               |           |           |      |        |
|             |               |           |           |      |        |
| W.          |               |           |           |      |        |
| MATTHEES    |               |           |           |      |        |
| SEN/D3741 - |               |           |           |      |        |
| D.          |               |           |           |      |        |
| WES         |               |           |           |      |        |
| TPHAL/D3740 |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/25/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| C. DEVELOP  |               |           |           |      |        |
| FLEET       |               |           |           |      |        |
| CLEARANCE   |               |           |           |      |        |
| RATIONAL    |               |           |           |      |        |
| INDEPENDENT |               |           |           |      |        |
| OF FAULT    |               |           |           |      |        |
|             |               |           |           |      |        |
| TREE        |               |           |           |      |        |
| INV         |               |           |           |      |        |
| ESTIGATION. |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| T.          |               |           |           |      |        |
| MCKEO       |               |           |           |      |        |
| UGH/D3741 - |               |           |           |      |        |
| D. WESTPHAL |               |           |           |      |        |
| / D3740     |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/25/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| C.1 PERFORM |               |           |           |      |        |
| AN          |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| OF RIBS AND |               |           |           |      |        |
| STRINGERS   |               |           |           |      |        |
| TO          |               |           |           |      |        |
|             |               |           |           |      |        |
| DETERMINE   |               |           |           |      |        |
| IF ANY      |               |           |           |      |        |
| OTHER       |               |           |           |      |        |
| CRACKS OR   |               |           |           |      |        |
| DAMAGE      |               |           |           |      |        |
| EXISTS      |               |           |           |      |        |
| (ET-118     |               |           |           |      |        |
|             |               |           |           |      |        |
| THRU 122).  |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| J. SPRAY /  |               |           |           |      |        |
| D3724 - D.  |               |           |           |      |        |
| OWENS /     |               |           |           |      |        |
| D3720       |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/25/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| C.2 REVIEW  |               |           |           |      |        |
| NCDS &      |               |           |           |      |        |
| SAFETY      |               |           |           |      |        |
| INCIDENT    |               |           |           |      |        |
| REPORTS FOR |               |           |           |      |        |
| ET-117 LH2  |               |           |           |      |        |
|             |               |           |           |      |        |
| TANK TO     |               |           |           |      |        |
| DETERMINE   |               |           |           |      |        |
| IF ANY      |               |           |           |      |        |
| INCIDENT    |               |           |           |      |        |
| OCCURRED.   |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| T. MCKEOUGH |               |           |           |      |        |
| / D3741 -   |               |           |           |      |        |
| D.          |               |           |           |      |        |
| WES         |               |           |           |      |        |
| TPHAL/D3740 |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/18/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| C.3 REVIEW  |               |           |           |      |        |
| NCD HISTORY |               |           |           |      |        |
| FOR         |               |           |           |      |        |
| PREVIOUS    |               |           |           |      |        |
| OCCURRENCES |               |           |           |      |        |
| OF CRACKS.  |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| J.          |               |           |           |      |        |
| VARRIE      |               |           |           |      |        |
| LLO/D3741 - |               |           |           |      |        |
| D.          |               |           |           |      |        |
| WES         |               |           |           |      |        |
| TPHAL/D3740 |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/18/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| C.4 DEVELOP |               |           |           |      |        |
| AN          |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| METHOD FOR  |               |           |           |      |        |
| BUILT       |               |           |           |      |        |
| TANKS.      |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| T. MCKEOUGH |               |           |           |      |        |
| / D3741 &   |               |           |           |      |        |
| S. MCEVOY / |               |           |           |      |        |
| 3742        |               |           |           |      |        |
|             |               |           |           |      |        |
| D. WESTPHAL |               |           |           |      |        |
| / D3740     |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/25/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| C.5 REVIEW  |               |           |           |      |        |
| BUILD PAPER |               |           |           |      |        |
| AND         |               |           |           |      |        |
| INTERVIEW   |               |           |           |      |        |
| INSPECTORS  |               |           |           |      |        |
| AND         |               |           |           |      |        |
|             |               |           |           |      |        |
| PR          |               |           |           |      |        |
| ACTITIONERS |               |           |           |      |        |
| TO          |               |           |           |      |        |
| DETERMINE   |               |           |           |      |        |
| NUMBER AND  |               |           |           |      |        |
| TYPE OF     |               |           |           |      |        |
|             |               |           |           |      |        |
| I           |               |           |           |      |        |
| NSPECTIONS. |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| T. MCKEOUGH |               |           |           |      |        |
| / D3741 -   |               |           |           |      |        |
| D.          |               |           |           |      |        |
| WES         |               |           |           |      |        |
| TPHAL/D3740 |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/18/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| CAUSE       |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| UNDER       |               |           |           |      |        |
| IN          |               |           |           |      |        |
| VESTIGATION |               |           |           |      |        |
|             |               |           |           |      |        |
| TASK II     |               |           |           |      |        |
| CORRECTIVE  |               |           |           |      |        |
| ACTION      |               |           |           |      |        |
|             |               |           |           |      |        |
| PENDING     |               |           |           |      |        |
| RESULTS OF  |               |           |           |      |        |
| INVE        |               |           |           |      |        |
| STIGATIONS. |               |           |           |      |        |
|             |               |           |           |      |        |
| TASK III    |               |           |           |      |        |
| CLEARANCE   |               |           |           |      |        |
| OF          |               |           |           |      |        |
| EF          |               |           |           |      |        |
| FECTIVITIES |               |           |           |      |        |
|             |               |           |           |      |        |
| IN WORK,    |               |           |           |      |        |
| SEE TASKS   |               |           |           |      |        |
| I.A & I.B.  |               |           |           |      |        |
|             |               |           |           |      |        |
| TASK IV     |               |           |           |      |        |
| CAPS        |               |           |           |      |        |
| CLOSURE     |               |           |           |      |        |
| SUMMARY     |               |           |           |      |        |
|             |               |           |           |      |        |
| PENDING     |               |           |           |      |        |
| COMPLETION  |               |           |           |      |        |
| OF ALL      |               |           |           |      |        |
| TASKS.      |               |           |           |      |        |
|             |               |           |           |      |        |
| 0           |               |           |           |      |        |
| 6/29/2001 - |               |           |           |      |        |
| CONTRACTOR  |               |           |           |      |        |
| SUBMITTED   |               |           |           |      |        |
| UPDATE      |               |           |           |      |        |
| PLA         |               |           |           |      |        |
| N-OF-ACTION |               |           |           |      |        |
| FOR CLOSURE |               |           |           |      |        |
|             |               |           |           |      |        |
| REQUEST AS  |               |           |           |      |        |
| FOLLOWS:    |               |           |           |      |        |
|             |               |           |           |      |        |
| PROBLEM     |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-        |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| \*DURING    |               |           |           |      |        |
| POST PROOF  |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| OF THE LH2  |               |           |           |      |        |
| TANK FOR    |               |           |           |      |        |
| ET-117, TWO |               |           |           |      |        |
| CRACKS      |               |           |           |      |        |
|             |               |           |           |      |        |
| WERE FOUND  |               |           |           |      |        |
| ON RIBS     |               |           |           |      |        |
| C-35 & C-37 |               |           |           |      |        |
| (BARREL #3) |               |           |           |      |        |
| NEXT TO THE |               |           |           |      |        |
| S-12        |               |           |           |      |        |
| STRINGER ON |               |           |           |      |        |
|             |               |           |           |      |        |
| THE ISL. A  |               |           |           |      |        |
| HELIUM LEAK |               |           |           |      |        |
| CHECK WAS   |               |           |           |      |        |
| PERFORMED   |               |           |           |      |        |
| ON JUNE 8,  |               |           |           |      |        |
| 2001, AND A |               |           |           |      |        |
| LEAK        |               |           |           |      |        |
|             |               |           |           |      |        |
| CONDITION   |               |           |           |      |        |
| WAS         |               |           |           |      |        |
| IDENTIFIED. |               |           |           |      |        |
| FURTHER     |               |           |           |      |        |
| EVALUATION  |               |           |           |      |        |
| OF THE      |               |           |           |      |        |
| HELIUM LEAK |               |           |           |      |        |
| CHECK,      |               |           |           |      |        |
|             |               |           |           |      |        |
| DETERMINED  |               |           |           |      |        |
| THAT THE    |               |           |           |      |        |
| INDICATION  |               |           |           |      |        |
| WAS         |               |           |           |      |        |
| BACKGROUND  |               |           |           |      |        |
| LEVEL. WHEN |               |           |           |      |        |
| THE TANK    |               |           |           |      |        |
| WAS         |               |           |           |      |        |
|             |               |           |           |      |        |
| LEAK        |               |           |           |      |        |
| CHECKED     |               |           |           |      |        |
| WITH        |               |           |           |      |        |
| NITROGEN IN |               |           |           |      |        |
| BLDG. 451   |               |           |           |      |        |
| AT 6 PSI NO |               |           |           |      |        |
| LEAK WAS    |               |           |           |      |        |
| DETECTED.   |               |           |           |      |        |
|             |               |           |           |      |        |
| C           |               |           |           |      |        |
| RITICALITY: |               |           |           |      |        |
|             |               |           |           |      |        |
| \           |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| \*          |               |           |           |      |        |
| CRITICALITY |               |           |           |      |        |
| 3           |               |           |           |      |        |
|             |               |           |           |      |        |
| UPDATED     |               |           |           |      |        |
| PROBLEM,    |               |           |           |      |        |
| ALL TASKS   |               |           |           |      |        |
| IN TASK I & |               |           |           |      |        |
| CLOSED TASK |               |           |           |      |        |
| III.        |               |           |           |      |        |
|             |               |           |           |      |        |
| \* -        |               |           |           |      |        |
| DENOTES     |               |           |           |      |        |
| CHANGES     |               |           |           |      |        |
| FROM LAST   |               |           |           |      |        |
| REVISION.   |               |           |           |      |        |
|             |               |           |           |      |        |
| GENERAL:    |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-        |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| DURING      |               |           |           |      |        |
| PERFORMANCE |               |           |           |      |        |
| OF THE      |               |           |           |      |        |
| ET-117 LH2  |               |           |           |      |        |
| TANK POST   |               |           |           |      |        |
| PROOF       |               |           |           |      |        |
| SHAKEDOWN   |               |           |           |      |        |
|             |               |           |           |      |        |
| INSPECTION, |               |           |           |      |        |
| TWO CRACKS  |               |           |           |      |        |
| WERE        |               |           |           |      |        |
| VISUALLY    |               |           |           |      |        |
| IDENTIFIED  |               |           |           |      |        |
| ON RIBS     |               |           |           |      |        |
| C-35 & C-37 |               |           |           |      |        |
|             |               |           |           |      |        |
| NEXT TO THE |               |           |           |      |        |
| S-12        |               |           |           |      |        |
| STRINGER ON |               |           |           |      |        |
| THE ISL.    |               |           |           |      |        |
| THE CRACKS  |               |           |           |      |        |
| ARE LOCATED |               |           |           |      |        |
| WHERE THE   |               |           |           |      |        |
|             |               |           |           |      |        |
| RIBS        |               |           |           |      |        |
| TRANSITION  |               |           |           |      |        |
| INTO THE    |               |           |           |      |        |
| WELD LAND   |               |           |           |      |        |
| AND THROUGH |               |           |           |      |        |
| THE         |               |           |           |      |        |
| \"DUTTON\"  |               |           |           |      |        |
| GROOVE.     |               |           |           |      |        |
|             |               |           |           |      |        |
| THIS IS     |               |           |           |      |        |
| NEXT TO THE |               |           |           |      |        |
| HB3-8 WELD  |               |           |           |      |        |
| AT STATION  |               |           |           |      |        |
| 1377, ON    |               |           |           |      |        |
| BARREL \#   |               |           |           |      |        |
| 3.          |               |           |           |      |        |
|             |               |           |           |      |        |
| SUBSEQUENT  |               |           |           |      |        |
| IN          |               |           |           |      |        |
| VESTIGATION |               |           |           |      |        |
| HAS SHOWN   |               |           |           |      |        |
| THAT THE    |               |           |           |      |        |
| CRACK ON    |               |           |           |      |        |
| C-37 HAS    |               |           |           |      |        |
| WITNESS     |               |           |           |      |        |
|             |               |           |           |      |        |
| MARKS ON    |               |           |           |      |        |
| THE OSL.    |               |           |           |      |        |
|             |               |           |           |      |        |
| CRACK ID    |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-        |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| C-35 (#1)   |               |           |           |      |        |
| C-37 (#2)   |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-\-      |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
| \-\-\-      |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| X-RAY       |               |           |           |      |        |
| LENGTH      |               |           |           |      |        |
| 1.025\"     |               |           |           |      |        |
| 1.225\"     |               |           |           |      |        |
|             |               |           |           |      |        |
| UT          |               |           |           |      |        |
| REMAINING   |               |           |           |      |        |
| LIGAMENT    |               |           |           |      |        |
| 0.100\" 0.0 |               |           |           |      |        |
| -VISUAL     |               |           |           |      |        |
| THRU WALL   |               |           |           |      |        |
|             |               |           |           |      |        |
| VISUAL -    |               |           |           |      |        |
| NCD LENGTH  |               |           |           |      |        |
| 1.000\"     |               |           |           |      |        |
| 1.100\"     |               |           |           |      |        |
|             |               |           |           |      |        |
| VISUAL -    |               |           |           |      |        |
| NCD WIDTH   |               |           |           |      |        |
| 0.125\"     |               |           |           |      |        |
| 0.125\"     |               |           |           |      |        |
|             |               |           |           |      |        |
| THE CRACK   |               |           |           |      |        |
| ON C-37     |               |           |           |      |        |
| APPEARS TO  |               |           |           |      |        |
| RUN FROM    |               |           |           |      |        |
| THE ISL TO  |               |           |           |      |        |
| THE OSL     |               |           |           |      |        |
| LEAVING A   |               |           |           |      |        |
|             |               |           |           |      |        |
| DIMPLE AND  |               |           |           |      |        |
| CRACK ON    |               |           |           |      |        |
| THE OSL.    |               |           |           |      |        |
|             |               |           |           |      |        |
| PANEL ID    |               |           |           |      |        |
| #\'S        |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-\       |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| DESCRI      |               |           |           |      |        |
| PTION/STATE |               |           |           |      |        |
| PART \#     |               |           |           |      |        |
| SERIAL \#   |               |           |           |      |        |
|             |               |           |           |      |        |
| TRIM LOG    |               |           |           |      |        |
| 80911       |               |           |           |      |        |
| 4400940M509 |               |           |           |      |        |
| OP1 1042590 |               |           |           |      |        |
|             |               |           |           |      |        |
| DELIVERED   |               |           |           |      |        |
| PART        |               |           |           |      |        |
| (FORMED)    |               |           |           |      |        |
| 80911       |               |           |           |      |        |
| 4400930-502 |               |           |           |      |        |
| 0000024     |               |           |           |      |        |
|             |               |           |           |      |        |
| MACHINED    |               |           |           |      |        |
| 80911       |               |           |           |      |        |
| 4400920-502 |               |           |           |      |        |
| 0000023     |               |           |           |      |        |
|             |               |           |           |      |        |
| INITIAL     |               |           |           |      |        |
| IN          |               |           |           |      |        |
| VESTIGATION |               |           |           |      |        |
| HAS SHOWN   |               |           |           |      |        |
| THAT THE    |               |           |           |      |        |
| RIBS &      |               |           |           |      |        |
| STRINGERS   |               |           |           |      |        |
| ARE THE     |               |           |           |      |        |
|             |               |           |           |      |        |
| PROPER      |               |           |           |      |        |
| THICKNESS.  |               |           |           |      |        |
| IN          |               |           |           |      |        |
| ADDITION,   |               |           |           |      |        |
| THE WEB     |               |           |           |      |        |
| THICKNESS   |               |           |           |      |        |
| WAS         |               |           |           |      |        |
| MEASURED    |               |           |           |      |        |
| AND         |               |           |           |      |        |
|             |               |           |           |      |        |
| MEETS       |               |           |           |      |        |
| ENGINEERING |               |           |           |      |        |
| RE          |               |           |           |      |        |
| QUIREMENTS. |               |           |           |      |        |
|             |               |           |           |      |        |
| TASK I      |               |           |           |      |        |
| FAIL        |               |           |           |      |        |
| URE/PROBLEM |               |           |           |      |        |
| IN          |               |           |           |      |        |
| VESTIGATION |               |           |           |      |        |
|             |               |           |           |      |        |
| A. DEVELOP  |               |           |           |      |        |
| AND CLOSE   |               |           |           |      |        |
| FAULT TREE. |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
|             |               |           |           |      |        |
| MATERIALS   |               |           |           |      |        |
| TASK LEAD   |               |           |           |      |        |
|             |               |           |           |      |        |
| D. BOLSTAD  |               |           |           |      |        |
| / D4600 -   |               |           |           |      |        |
| P.          |               |           |           |      |        |
| HINKELDEY / |               |           |           |      |        |
| D4600       |               |           |           |      |        |
|             |               |           |           |      |        |
| DESIGN TASK |               |           |           |      |        |
| LEAD        |               |           |           |      |        |
|             |               |           |           |      |        |
| J. PILET /  |               |           |           |      |        |
| D4130 - F.  |               |           |           |      |        |
| MANTO /     |               |           |           |      |        |
| D4100       |               |           |           |      |        |
|             |               |           |           |      |        |
| OVERLOAD /  |               |           |           |      |        |
| FABRICATION |               |           |           |      |        |
| TASK LEAD   |               |           |           |      |        |
|             |               |           |           |      |        |
| M. QUIGGLE  |               |           |           |      |        |
| / D3000     |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/25/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| \*          |               |           |           |      |        |
| EXTENSION:  |               |           |           |      |        |
| 7/20/01 -   |               |           |           |      |        |
| FORMAL      |               |           |           |      |        |
| CLOSURE OF  |               |           |           |      |        |
| ALL ITEMS   |               |           |           |      |        |
|             |               |           |           |      |        |
| \* STATUS:  |               |           |           |      |        |
|             |               |           |           |      |        |
| \-          |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| NO ISSUES   |               |           |           |      |        |
| WERE FOUND  |               |           |           |      |        |
| WITH THE    |               |           |           |      |        |
| MATERIAL OR |               |           |           |      |        |
| DESIGN OF   |               |           |           |      |        |
| THE PANEL.  |               |           |           |      |        |
|             |               |           |           |      |        |
| HOWEVER,    |               |           |           |      |        |
| THE         |               |           |           |      |        |
| OVERLOAD -  |               |           |           |      |        |
| FABRICATION |               |           |           |      |        |
| LEG OF THE  |               |           |           |      |        |
| FAULT TREE  |               |           |           |      |        |
| SHOWS       |               |           |           |      |        |
|             |               |           |           |      |        |
| DAMAGE      |               |           |           |      |        |
| OCCURRING   |               |           |           |      |        |
| AT MAF AS A |               |           |           |      |        |
| POSSIBLE    |               |           |           |      |        |
| AREA OF     |               |           |           |      |        |
| CONCERN.    |               |           |           |      |        |
|             |               |           |           |      |        |
| CLOSURE OF  |               |           |           |      |        |
| ALL ITEMS   |               |           |           |      |        |
| IS IN WORK. |               |           |           |      |        |
|             |               |           |           |      |        |
| B. PERFORM  |               |           |           |      |        |
| FAILURE     |               |           |           |      |        |
| ANALYSIS AT |               |           |           |      |        |
| THE REQUEST |               |           |           |      |        |
| OF          |               |           |           |      |        |
|             |               |           |           |      |        |
| FAULT TREE  |               |           |           |      |        |
| TEAM.       |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| D. BOLSTAD  |               |           |           |      |        |
| / D4600 -   |               |           |           |      |        |
| P.          |               |           |           |      |        |
| HINKELDEY/  |               |           |           |      |        |
| D4600       |               |           |           |      |        |
|             |               |           |           |      |        |
| W.          |               |           |           |      |        |
| MATTHEESSEN |               |           |           |      |        |
| / D3741 -   |               |           |           |      |        |
| D.WES       |               |           |           |      |        |
| TPHAL/D3740 |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/25/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| \*          |               |           |           |      |        |
| EXTENSION:  |               |           |           |      |        |
| 7/20/01 -   |               |           |           |      |        |
| FORMAL      |               |           |           |      |        |
| CLOSURE OF  |               |           |           |      |        |
| ALL ITEMS   |               |           |           |      |        |
|             |               |           |           |      |        |
| \* STATUS:  |               |           |           |      |        |
|             |               |           |           |      |        |
| \-          |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| MATERIAL    |               |           |           |      |        |
| MEETS       |               |           |           |      |        |
| ENGINEERING |               |           |           |      |        |
| RE          |               |           |           |      |        |
| QUIREMENTS. |               |           |           |      |        |
| FRACTURE    |               |           |           |      |        |
| SURFACES    |               |           |           |      |        |
| ARE         |               |           |           |      |        |
|             |               |           |           |      |        |
| CONSISTENT  |               |           |           |      |        |
| WITH A      |               |           |           |      |        |
| TENSILE     |               |           |           |      |        |
| OVER-LOAD   |               |           |           |      |        |
| SCENARIO.   |               |           |           |      |        |
| NO          |               |           |           |      |        |
| ANOMALIES   |               |           |           |      |        |
|             |               |           |           |      |        |
| WERE NOTED  |               |           |           |      |        |
| DURING THE  |               |           |           |      |        |
| ANALYSIS.   |               |           |           |      |        |
|             |               |           |           |      |        |
| C. DEVELOP  |               |           |           |      |        |
| FLEET       |               |           |           |      |        |
| CLEARANCE   |               |           |           |      |        |
| RATIONAL    |               |           |           |      |        |
| INDEPENDENT |               |           |           |      |        |
| OF FAULT    |               |           |           |      |        |
|             |               |           |           |      |        |
| TREE        |               |           |           |      |        |
| INV         |               |           |           |      |        |
| ESTIGATION. |               |           |           |      |        |
|             |               |           |           |      |        |
| RESPON      |               |           |           |      |        |
| SIBILITY:T. |               |           |           |      |        |
| MCKEOUGH /  |               |           |           |      |        |
| D3741 - D.  |               |           |           |      |        |
| WESTPHAL /  |               |           |           |      |        |
| D3740       |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/25/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| \*          |               |           |           |      |        |
| COMPLETE:   |               |           |           |      |        |
| 6/25/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| \* CLOSURE  |               |           |           |      |        |
| STATEMENT:  |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-        |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| SEE TASK    |               |           |           |      |        |
| III.        |               |           |           |      |        |
|             |               |           |           |      |        |
| C.1 PERFORM |               |           |           |      |        |
| AN          |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| OF RIBS AND |               |           |           |      |        |
| STRINGERS   |               |           |           |      |        |
| TO          |               |           |           |      |        |
| DETERMINE   |               |           |           |      |        |
|             |               |           |           |      |        |
| IF ANY      |               |           |           |      |        |
| OTHER       |               |           |           |      |        |
| CRACKS OR   |               |           |           |      |        |
| DAMAGE      |               |           |           |      |        |
| EXISTS      |               |           |           |      |        |
| (ET-117     |               |           |           |      |        |
| THRU 122).  |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| J. SPRAY /  |               |           |           |      |        |
| D3724 - D.  |               |           |           |      |        |
| OWENS /     |               |           |           |      |        |
| D3720       |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/25/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| \*          |               |           |           |      |        |
| EXTENSION:  |               |           |           |      |        |
| 8/14/01 -   |               |           |           |      |        |
| COMPLETION  |               |           |           |      |        |
| OF ET-122   |               |           |           |      |        |
| BARREL #4   |               |           |           |      |        |
|             |               |           |           |      |        |
| \* STATUS:  |               |           |           |      |        |
|             |               |           |           |      |        |
| \-          |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| NO          |               |           |           |      |        |
| DI          |               |           |           |      |        |
| SCREPANCIES |               |           |           |      |        |
| WERE NOTED. |               |           |           |      |        |
| ET-117 THRU |               |           |           |      |        |
| 120         |               |           |           |      |        |
|             |               |           |           |      |        |
| COMPLETE.   |               |           |           |      |        |
| BARRELS 1,  |               |           |           |      |        |
| 2, AND 3    |               |           |           |      |        |
| FOR ET-121  |               |           |           |      |        |
| AND BARRELS |               |           |           |      |        |
| 1 AND 2     |               |           |           |      |        |
|             |               |           |           |      |        |
| FOR ET-122  |               |           |           |      |        |
| ARE         |               |           |           |      |        |
| COMPLETE.   |               |           |           |      |        |
|             |               |           |           |      |        |
| C.2 REVIEW  |               |           |           |      |        |
| NCDS &      |               |           |           |      |        |
| SAFETY      |               |           |           |      |        |
| INCIDENT    |               |           |           |      |        |
| REPORTS FOR |               |           |           |      |        |
| ET-117 LH2  |               |           |           |      |        |
| TANK TO     |               |           |           |      |        |
|             |               |           |           |      |        |
| DETERMINE   |               |           |           |      |        |
| IF ANY      |               |           |           |      |        |
| INCIDENT    |               |           |           |      |        |
| OCCURRED.   |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| T. MCKEOUGH |               |           |           |      |        |
| / D3741 -   |               |           |           |      |        |
| D. WESTPHAL |               |           |           |      |        |
| / D3740     |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/18/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| \*          |               |           |           |      |        |
| EXTENSION:  |               |           |           |      |        |
| 7/20/01 -   |               |           |           |      |        |
| FORMAL      |               |           |           |      |        |
| CLOSURE OF  |               |           |           |      |        |
| ALL ITEMS   |               |           |           |      |        |
|             |               |           |           |      |        |
| \* STATUS:  |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| REVIEW      |               |           |           |      |        |
| SHOWED NO   |               |           |           |      |        |
| INCIDENCES  |               |           |           |      |        |
| IN THE AREA |               |           |           |      |        |
| OF INTEREST |               |           |           |      |        |
| ON          |               |           |           |      |        |
|             |               |           |           |      |        |
| ET-117 LH2  |               |           |           |      |        |
| TANK.       |               |           |           |      |        |
|             |               |           |           |      |        |
| C.3 REVIEW  |               |           |           |      |        |
| NCD HISTORY |               |           |           |      |        |
| FOR         |               |           |           |      |        |
| PREVIOUS    |               |           |           |      |        |
| OCCURRENCES |               |           |           |      |        |
| OF CRACKS.  |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| J.          |               |           |           |      |        |
| VARRIELLO / |               |           |           |      |        |
| D3741 - D.  |               |           |           |      |        |
| WESTPHAL /  |               |           |           |      |        |
| D3740       |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/18/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| \*          |               |           |           |      |        |
| COMPLETE:   |               |           |           |      |        |
| 6/18/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| \* CLOSURE  |               |           |           |      |        |
| STATEMENT:  |               |           |           |      |        |
|             |               |           |           |      |        |
| \-          |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| REVIEW WAS  |               |           |           |      |        |
| PERFORMED   |               |           |           |      |        |
| AND ALL     |               |           |           |      |        |
| PREVIOUS    |               |           |           |      |        |
| NON-C       |               |           |           |      |        |
| ONFORMANCES |               |           |           |      |        |
| WERE        |               |           |           |      |        |
|             |               |           |           |      |        |
| MAPPED AND  |               |           |           |      |        |
| PROVIDED TO |               |           |           |      |        |
| THE FAULT   |               |           |           |      |        |
| TREE BLOCK  |               |           |           |      |        |
| LEADS       |               |           |           |      |        |
|             |               |           |           |      |        |
| C.4 DEVELOP |               |           |           |      |        |
| AN          |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| METHOD FOR  |               |           |           |      |        |
| BUILT       |               |           |           |      |        |
| TANKS.      |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| T. MCKEOUGH |               |           |           |      |        |
| / D3741 &   |               |           |           |      |        |
| S. MCEVOY / |               |           |           |      |        |
| 3742        |               |           |           |      |        |
|             |               |           |           |      |        |
| D. WESTPHAL |               |           |           |      |        |
| / D3740     |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/25/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| \*          |               |           |           |      |        |
| COMPLETE:   |               |           |           |      |        |
| 7/27/01     |               |           |           |      |        |
| FORMAL      |               |           |           |      |        |
| CLOSURE IN  |               |           |           |      |        |
| PROCESS     |               |           |           |      |        |
|             |               |           |           |      |        |
| \* STATUS:  |               |           |           |      |        |
|             |               |           |           |      |        |
| \-          |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| SEVERAL     |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| METHODS     |               |           |           |      |        |
| WERE        |               |           |           |      |        |
| EVALUATED.  |               |           |           |      |        |
| THE MOST    |               |           |           |      |        |
|             |               |           |           |      |        |
| EFFICIENT   |               |           |           |      |        |
| VISUAL      |               |           |           |      |        |
| METHOD WAS  |               |           |           |      |        |
| A           |               |           |           |      |        |
| HORIZONTAL  |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| WITH        |               |           |           |      |        |
|             |               |           |           |      |        |
| TANK ENTRY  |               |           |           |      |        |
| USING A     |               |           |           |      |        |
| SPOTTING    |               |           |           |      |        |
| SCOPE AS    |               |           |           |      |        |
| NECESSARY.  |               |           |           |      |        |
| A VERTICAL  |               |           |           |      |        |
|             |               |           |           |      |        |
| VISUAL      |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| FROM THE    |               |           |           |      |        |
| 2058 FRAME  |               |           |           |      |        |
| USING THE   |               |           |           |      |        |
| SAME        |               |           |           |      |        |
| SPOTTER     |               |           |           |      |        |
|             |               |           |           |      |        |
| SCOPE       |               |           |           |      |        |
| PRODUCED    |               |           |           |      |        |
| ACCEPTABLE  |               |           |           |      |        |
| RESULTS,    |               |           |           |      |        |
| HOWEVER ONE |               |           |           |      |        |
| RIB ABOVE   |               |           |           |      |        |
|             |               |           |           |      |        |
| EACH \"T\"  |               |           |           |      |        |
| RING WAS    |               |           |           |      |        |
| BLOCKED     |               |           |           |      |        |
| FROM VIEW.  |               |           |           |      |        |
| AN          |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
|             |               |           |           |      |        |
| PERFORMED   |               |           |           |      |        |
| FROM THE    |               |           |           |      |        |
| FWD END OF  |               |           |           |      |        |
| THE LH2     |               |           |           |      |        |
| TANK WITH   |               |           |           |      |        |
| OUT MAKING  |               |           |           |      |        |
| A           |               |           |           |      |        |
|             |               |           |           |      |        |
| TANK ENTRY, |               |           |           |      |        |
| PROVIDED    |               |           |           |      |        |
| VISUAL      |               |           |           |      |        |
| AC          |               |           |           |      |        |
| CESSIBILITY |               |           |           |      |        |
| TO THE RIBS |               |           |           |      |        |
| THAT        |               |           |           |      |        |
|             |               |           |           |      |        |
| COULD NOT   |               |           |           |      |        |
| BE          |               |           |           |      |        |
| INSPECTED   |               |           |           |      |        |
| FROM THE    |               |           |           |      |        |
| AFT END.    |               |           |           |      |        |
| THROUGH THE |               |           |           |      |        |
| TANK,       |               |           |           |      |        |
|             |               |           |           |      |        |
| (DUAL WALL) |               |           |           |      |        |
| X-RAY       |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| WAS         |               |           |           |      |        |
| DEVELOPED   |               |           |           |      |        |
| AND COULD   |               |           |           |      |        |
| DETECT A    |               |           |           |      |        |
|             |               |           |           |      |        |
| CRACK OF    |               |           |           |      |        |
| THE TYPE    |               |           |           |      |        |
| SEEN ON     |               |           |           |      |        |
| ET-117 LH2  |               |           |           |      |        |
| TANK.       |               |           |           |      |        |
|             |               |           |           |      |        |
| C.5 REVIEW  |               |           |           |      |        |
| BUILD PAPER |               |           |           |      |        |
| AND         |               |           |           |      |        |
| INTERVIEW   |               |           |           |      |        |
| INSPECTORS  |               |           |           |      |        |
| AND         |               |           |           |      |        |
| PR          |               |           |           |      |        |
| ACTITIONERS |               |           |           |      |        |
|             |               |           |           |      |        |
| TO          |               |           |           |      |        |
| DETERMINE   |               |           |           |      |        |
| NUMBER AND  |               |           |           |      |        |
| TYPE OF     |               |           |           |      |        |
| I           |               |           |           |      |        |
| NSPECTIONS. |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| T. MCKEOUGH |               |           |           |      |        |
| / D3741 -   |               |           |           |      |        |
| D. WESTPHAL |               |           |           |      |        |
| / D3740     |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/18/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| \*          |               |           |           |      |        |
| COMPLETE:   |               |           |           |      |        |
| 6/18/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| \* CLOSURE  |               |           |           |      |        |
| STATEMENT:  |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| NUMBER AND  |               |           |           |      |        |
| TYPE OF     |               |           |           |      |        |
| INSPECTIONS |               |           |           |      |        |
| WERE        |               |           |           |      |        |
| IDENTIFIED  |               |           |           |      |        |
| AND ADDED   |               |           |           |      |        |
| TO          |               |           |           |      |        |
|             |               |           |           |      |        |
| THE ET-117  |               |           |           |      |        |
| LH2 TANK    |               |           |           |      |        |
| PRODUCTION  |               |           |           |      |        |
| FAULT TREE  |               |           |           |      |        |
| FLOW CHART. |               |           |           |      |        |
|             |               |           |           |      |        |
| INTERVIEWS  |               |           |           |      |        |
| WITH        |               |           |           |      |        |
| PR          |               |           |           |      |        |
| ACTITIONERS |               |           |           |      |        |
| WERE        |               |           |           |      |        |
| PERFORMED   |               |           |           |      |        |
| TO          |               |           |           |      |        |
| DETERMINE   |               |           |           |      |        |
|             |               |           |           |      |        |
| EF          |               |           |           |      |        |
| FECTIVENESS |               |           |           |      |        |
| OF POST     |               |           |           |      |        |
| PROOF       |               |           |           |      |        |
| I           |               |           |           |      |        |
| NSPECTIONS. |               |           |           |      |        |
| IT WAS A    |               |           |           |      |        |
| CONSENSUS   |               |           |           |      |        |
|             |               |           |           |      |        |
| AMONG THE   |               |           |           |      |        |
| PR          |               |           |           |      |        |
| ACTITIONERS |               |           |           |      |        |
| THAT THE    |               |           |           |      |        |
| CLEANING    |               |           |           |      |        |
| /INSPECTION |               |           |           |      |        |
| WOULD       |               |           |           |      |        |
|             |               |           |           |      |        |
| DETECT THIS |               |           |           |      |        |
| TYPE OF     |               |           |           |      |        |
| DEFECT.     |               |           |           |      |        |
| THIS STEP   |               |           |           |      |        |
| IN THE      |               |           |           |      |        |
| PROCESS IS  |               |           |           |      |        |
|             |               |           |           |      |        |
| PERFORMED   |               |           |           |      |        |
| BY THREE    |               |           |           |      |        |
| DIFFERENT   |               |           |           |      |        |
| OR          |               |           |           |      |        |
| GANIZATIONS |               |           |           |      |        |
| (PRODUCTION |               |           |           |      |        |
|             |               |           |           |      |        |
| PR          |               |           |           |      |        |
| ACTITIONER, |               |           |           |      |        |
| QUALITY     |               |           |           |      |        |
| CONTROL     |               |           |           |      |        |
| INSPECTOR   |               |           |           |      |        |
| AND A       |               |           |           |      |        |
| MEMBER OF   |               |           |           |      |        |
| DCMA).      |               |           |           |      |        |
|             |               |           |           |      |        |
| CAUSE       |               |           |           |      |        |
|             |               |           |           |      |        |
| \*          |               |           |           |      |        |
| INADVERTENT |               |           |           |      |        |
| DAMAGE TO   |               |           |           |      |        |
| BARREL      |               |           |           |      |        |
| SECTION     |               |           |           |      |        |
| DURING MAF  |               |           |           |      |        |
| F           |               |           |           |      |        |
| ABRICATION. |               |           |           |      |        |
|             |               |           |           |      |        |
| TASK II     |               |           |           |      |        |
| CORRECTIVE  |               |           |           |      |        |
| ACTION      |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| PENDING     |               |           |           |      |        |
| RESULTS OF  |               |           |           |      |        |
| INVE        |               |           |           |      |        |
| STIGATIONS. |               |           |           |      |        |
|             |               |           |           |      |        |
| TASK III    |               |           |           |      |        |
| CLEARANCE   |               |           |           |      |        |
| OF          |               |           |           |      |        |
| EF          |               |           |           |      |        |
| FECTIVITIES |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-\-\     |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| \* FLIGHT   |               |           |           |      |        |
| RATIONALE:  |               |           |           |      |        |
|             |               |           |           |      |        |
| O FAULT     |               |           |           |      |        |
| TREE TEAM   |               |           |           |      |        |
| AND SENIOR  |               |           |           |      |        |
| REVIEW      |               |           |           |      |        |
| BOARD       |               |           |           |      |        |
| CONCLUDED   |               |           |           |      |        |
|             |               |           |           |      |        |
| THAT THIS   |               |           |           |      |        |
| WAS AN      |               |           |           |      |        |
| ISOLATED    |               |           |           |      |        |
| EVENT AND   |               |           |           |      |        |
| NOT THE     |               |           |           |      |        |
| RESULT OF   |               |           |           |      |        |
|             |               |           |           |      |        |
| A SYSTEMIC  |               |           |           |      |        |
| PROBLEM.    |               |           |           |      |        |
|             |               |           |           |      |        |
| \- ET       |               |           |           |      |        |
| DESIGN AND  |               |           |           |      |        |
| MATERIALS   |               |           |           |      |        |
| WERE        |               |           |           |      |        |
| EXONERATED  |               |           |           |      |        |
| AS          |               |           |           |      |        |
| C           |               |           |           |      |        |
| ONTRIBUTORS |               |           |           |      |        |
|             |               |           |           |      |        |
| TO THE      |               |           |           |      |        |
| ET-117      |               |           |           |      |        |
| ANOMALY.    |               |           |           |      |        |
|             |               |           |           |      |        |
| \- RIGOROUS |               |           |           |      |        |
| REVIEW OF   |               |           |           |      |        |
| THE PROCESS |               |           |           |      |        |
| I           |               |           |           |      |        |
| NSTRUCTIONS |               |           |           |      |        |
| FOR POST    |               |           |           |      |        |
|             |               |           |           |      |        |
| PROOF       |               |           |           |      |        |
| PROCESSING  |               |           |           |      |        |
| FOUND NO    |               |           |           |      |        |
| IN          |               |           |           |      |        |
| ADEQUACIES. |               |           |           |      |        |
|             |               |           |           |      |        |
| \- FAULT    |               |           |           |      |        |
| TREE AND    |               |           |           |      |        |
| FRACTURE    |               |           |           |      |        |
| FACE        |               |           |           |      |        |
| ANALYSIS    |               |           |           |      |        |
| CONCLUDED   |               |           |           |      |        |
| THAT        |               |           |           |      |        |
|             |               |           |           |      |        |
| THE ET-117  |               |           |           |      |        |
| DAMAGE      |               |           |           |      |        |
| EVENT       |               |           |           |      |        |
| OCCURRED    |               |           |           |      |        |
| DURING      |               |           |           |      |        |
| PROCESSING, |               |           |           |      |        |
| PRIOR TO    |               |           |           |      |        |
|             |               |           |           |      |        |
| PROOF TEST. |               |           |           |      |        |
|             |               |           |           |      |        |
| \- CRACKS   |               |           |           |      |        |
| COULD HAVE  |               |           |           |      |        |
| OCCURRED    |               |           |           |      |        |
| DURING THE  |               |           |           |      |        |
| DAMAGE      |               |           |           |      |        |
| EVENT OR    |               |           |           |      |        |
|             |               |           |           |      |        |
| DURING THE  |               |           |           |      |        |
| PROOF TEST  |               |           |           |      |        |
| DUE TO      |               |           |           |      |        |
| RESIDUAL    |               |           |           |      |        |
| STRESS FROM |               |           |           |      |        |
|             |               |           |           |      |        |
| THE DAMAGE  |               |           |           |      |        |
| EVENT.      |               |           |           |      |        |
|             |               |           |           |      |        |
| \- FIRST OF |               |           |           |      |        |
| THREE       |               |           |           |      |        |
| PLANNED     |               |           |           |      |        |
| POST-PROOF  |               |           |           |      |        |
| CLEANING    |               |           |           |      |        |
| AND         |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
|             |               |           |           |      |        |
| STEPS       |               |           |           |      |        |
| IDENTIFIED  |               |           |           |      |        |
| CRACKS.     |               |           |           |      |        |
|             |               |           |           |      |        |
| \-          |               |           |           |      |        |
| IN          |               |           |           |      |        |
| VESTIGATION |               |           |           |      |        |
| VALIDATED   |               |           |           |      |        |
| PROOF TEST  |               |           |           |      |        |
| AND POST    |               |           |           |      |        |
| PROOF       |               |           |           |      |        |
|             |               |           |           |      |        |
| INSPECTIONS |               |           |           |      |        |
| FOR         |               |           |           |      |        |
| CE          |               |           |           |      |        |
| RTIFICATION |               |           |           |      |        |
| OF TANKS.   |               |           |           |      |        |
|             |               |           |           |      |        |
| TASK IV     |               |           |           |      |        |
| CAPS        |               |           |           |      |        |
| CLOSURE     |               |           |           |      |        |
| SUMMARY     |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-\-      |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| PENDING     |               |           |           |      |        |
| COMPLETION  |               |           |           |      |        |
| OF ALL      |               |           |           |      |        |
| TASKS.      |               |           |           |      |        |
|             |               |           |           |      |        |
| 1           |               |           |           |      |        |
| 1/27/2001 - |               |           |           |      |        |
| CONTRACTOR  |               |           |           |      |        |
| SUBMITTED   |               |           |           |      |        |
| FULL        |               |           |           |      |        |
| CLOSURE AS  |               |           |           |      |        |
| FOLLOWS:    |               |           |           |      |        |
|             |               |           |           |      |        |
| PROBLEM     |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-        |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| DURING POST |               |           |           |      |        |
| PROOF       |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| OF THE LH2  |               |           |           |      |        |
| TANK FOR    |               |           |           |      |        |
| ET-117, TWO |               |           |           |      |        |
|             |               |           |           |      |        |
| CRACKS WERE |               |           |           |      |        |
| FOUND ON    |               |           |           |      |        |
| RIBS C-35 & |               |           |           |      |        |
| C-37        |               |           |           |      |        |
| (BARREL #3) |               |           |           |      |        |
| NEXT TO THE |               |           |           |      |        |
| S-12        |               |           |           |      |        |
|             |               |           |           |      |        |
| STRINGER ON |               |           |           |      |        |
| THE ISL. A  |               |           |           |      |        |
| HELIUM LEAK |               |           |           |      |        |
| CHECK WAS   |               |           |           |      |        |
| PERFORMED   |               |           |           |      |        |
| ON JUNE 8,  |               |           |           |      |        |
|             |               |           |           |      |        |
| 2001, AND A |               |           |           |      |        |
| LEAK        |               |           |           |      |        |
| CONDITION   |               |           |           |      |        |
| WAS         |               |           |           |      |        |
| IDENTIFIED. |               |           |           |      |        |
| FURTHER     |               |           |           |      |        |
| EVALUATION  |               |           |           |      |        |
| OF THE      |               |           |           |      |        |
|             |               |           |           |      |        |
| HELIUM LEAK |               |           |           |      |        |
| CHECK,      |               |           |           |      |        |
| DETERMINED  |               |           |           |      |        |
| THAT THE    |               |           |           |      |        |
| INDICATION  |               |           |           |      |        |
| WAS         |               |           |           |      |        |
| BACKGROUND  |               |           |           |      |        |
|             |               |           |           |      |        |
| LEVEL. WHEN |               |           |           |      |        |
| THE TANK    |               |           |           |      |        |
| WAS LEAK    |               |           |           |      |        |
| CHECKED     |               |           |           |      |        |
| WITH        |               |           |           |      |        |
| NITROGEN IN |               |           |           |      |        |
| BLDG. 451   |               |           |           |      |        |
| AT 6        |               |           |           |      |        |
|             |               |           |           |      |        |
| PSI NO LEAK |               |           |           |      |        |
| WAS         |               |           |           |      |        |
| DETECTED.   |               |           |           |      |        |
|             |               |           |           |      |        |
| GENERAL:    |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-        |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| DURING      |               |           |           |      |        |
| PERFORMANCE |               |           |           |      |        |
| OF THE      |               |           |           |      |        |
| ET-117 LH2  |               |           |           |      |        |
| TANK POST   |               |           |           |      |        |
| PROOF       |               |           |           |      |        |
| SHAKEDOWN   |               |           |           |      |        |
|             |               |           |           |      |        |
| INSPECTION, |               |           |           |      |        |
| TWO CRACKS  |               |           |           |      |        |
| WERE        |               |           |           |      |        |
| VISUALLY    |               |           |           |      |        |
| IDENTIFIED  |               |           |           |      |        |
| ON RIBS     |               |           |           |      |        |
| C-35 & C-37 |               |           |           |      |        |
|             |               |           |           |      |        |
| NEXT TO THE |               |           |           |      |        |
| S-12        |               |           |           |      |        |
| STRINGER ON |               |           |           |      |        |
| THE ISL.    |               |           |           |      |        |
| THE CRACKS  |               |           |           |      |        |
| ARE LOCATED |               |           |           |      |        |
| WHERE THE   |               |           |           |      |        |
|             |               |           |           |      |        |
| RIBS        |               |           |           |      |        |
| TRANSITION  |               |           |           |      |        |
| INTO THE    |               |           |           |      |        |
| WELD LAND   |               |           |           |      |        |
| AND THROUGH |               |           |           |      |        |
| THE         |               |           |           |      |        |
| \"DUTTON\"  |               |           |           |      |        |
| GROOVE.     |               |           |           |      |        |
|             |               |           |           |      |        |
| THIS IS     |               |           |           |      |        |
| NEXT TO THE |               |           |           |      |        |
| HB3-8 WELD  |               |           |           |      |        |
| AT STATION  |               |           |           |      |        |
| 1377, ON    |               |           |           |      |        |
| BARREL \#   |               |           |           |      |        |
| 3.          |               |           |           |      |        |
|             |               |           |           |      |        |
| SUBSEQUENT  |               |           |           |      |        |
| IN          |               |           |           |      |        |
| VESTIGATION |               |           |           |      |        |
| HAS SHOWN   |               |           |           |      |        |
| THAT THE    |               |           |           |      |        |
| CRACK ON    |               |           |           |      |        |
| C-37 HAS    |               |           |           |      |        |
| WITNESS     |               |           |           |      |        |
|             |               |           |           |      |        |
| MARKS ON    |               |           |           |      |        |
| THE OSL.    |               |           |           |      |        |
|             |               |           |           |      |        |
| CRACK ID    |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-        |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| C-35 (#1)   |               |           |           |      |        |
| C-37 (#2)   |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-\-      |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
| \-\-\-      |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| X-RAY       |               |           |           |      |        |
| LENGTH      |               |           |           |      |        |
| 1.025\"     |               |           |           |      |        |
| 1.225\"     |               |           |           |      |        |
|             |               |           |           |      |        |
| UT          |               |           |           |      |        |
| REMAINING   |               |           |           |      |        |
| LIGAMENT    |               |           |           |      |        |
| 0.100\"     |               |           |           |      |        |
| 0.0 -       |               |           |           |      |        |
| VISUAL THRU |               |           |           |      |        |
| WALL        |               |           |           |      |        |
|             |               |           |           |      |        |
| VISUAL -    |               |           |           |      |        |
| NCD LENGTH  |               |           |           |      |        |
| 1.000\"     |               |           |           |      |        |
| 1.100\"     |               |           |           |      |        |
|             |               |           |           |      |        |
| VISUAL -    |               |           |           |      |        |
| NCD WIDTH   |               |           |           |      |        |
| 0.125\"     |               |           |           |      |        |
| 0.125\"     |               |           |           |      |        |
|             |               |           |           |      |        |
| THE CRACK   |               |           |           |      |        |
| ON C-37     |               |           |           |      |        |
| APPEARS TO  |               |           |           |      |        |
| RUN FROM    |               |           |           |      |        |
| THE ISL TO  |               |           |           |      |        |
| THE OSL     |               |           |           |      |        |
| LEAVING A   |               |           |           |      |        |
|             |               |           |           |      |        |
| DIMPLE AND  |               |           |           |      |        |
| CRACK ON    |               |           |           |      |        |
| THE OSL.    |               |           |           |      |        |
|             |               |           |           |      |        |
| PANEL ID    |               |           |           |      |        |
| #\'S        |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\         |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| DESCRI      |               |           |           |      |        |
| PTION/STATE |               |           |           |      |        |
| PART \#     |               |           |           |      |        |
| SERIAL \#   |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
| \-\-\-      |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
| \-\-\-      |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| TRIM LOG    |               |           |           |      |        |
| 80911       |               |           |           |      |        |
| 4400940M509 |               |           |           |      |        |
| OP1 1042590 |               |           |           |      |        |
|             |               |           |           |      |        |
| DELIVERED   |               |           |           |      |        |
| PART        |               |           |           |      |        |
| (FORMED)    |               |           |           |      |        |
| 80911       |               |           |           |      |        |
| 4400930-502 |               |           |           |      |        |
| 0000024     |               |           |           |      |        |
|             |               |           |           |      |        |
| MACHINED    |               |           |           |      |        |
| 80911       |               |           |           |      |        |
| 4400920-502 |               |           |           |      |        |
| 0000023     |               |           |           |      |        |
|             |               |           |           |      |        |
| INITIAL     |               |           |           |      |        |
| IN          |               |           |           |      |        |
| VESTIGATION |               |           |           |      |        |
| HAS SHOWN   |               |           |           |      |        |
| THAT THE    |               |           |           |      |        |
| RIBS &      |               |           |           |      |        |
| STRINGERS   |               |           |           |      |        |
| ARE THE     |               |           |           |      |        |
|             |               |           |           |      |        |
| PROPER      |               |           |           |      |        |
| THICKNESS.  |               |           |           |      |        |
| IN          |               |           |           |      |        |
| ADDITION,   |               |           |           |      |        |
| THE WEB     |               |           |           |      |        |
| THICKNESS   |               |           |           |      |        |
| WAS         |               |           |           |      |        |
| MEASURED    |               |           |           |      |        |
| AND         |               |           |           |      |        |
|             |               |           |           |      |        |
| MEETS       |               |           |           |      |        |
| ENGINEERING |               |           |           |      |        |
| RE          |               |           |           |      |        |
| QUIREMENTS. |               |           |           |      |        |
|             |               |           |           |      |        |
| TASK I      |               |           |           |      |        |
| FAIL        |               |           |           |      |        |
| URE/PROBLEM |               |           |           |      |        |
| IN          |               |           |           |      |        |
| VESTIGATION |               |           |           |      |        |
|             |               |           |           |      |        |
| \-          |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| \* A.       |               |           |           |      |        |
| DEVELOP AND |               |           |           |      |        |
| CLOSE FAULT |               |           |           |      |        |
| TREE.       |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
|             |               |           |           |      |        |
| MATERIALS   |               |           |           |      |        |
| TASK LEAD   |               |           |           |      |        |
|             |               |           |           |      |        |
| D.          |               |           |           |      |        |
| BOLS        |               |           |           |      |        |
| TAD/D4600 - |               |           |           |      |        |
| P.          |               |           |           |      |        |
| HINK        |               |           |           |      |        |
| ELDEY/D4600 |               |           |           |      |        |
|             |               |           |           |      |        |
| DESIGN TASK |               |           |           |      |        |
| LEAD        |               |           |           |      |        |
|             |               |           |           |      |        |
| J.          |               |           |           |      |        |
| PI          |               |           |           |      |        |
| LET/D4130 - |               |           |           |      |        |
| F.          |               |           |           |      |        |
| MANTO/D4100 |               |           |           |      |        |
|             |               |           |           |      |        |
| OVERLOAD /  |               |           |           |      |        |
| FABRICATION |               |           |           |      |        |
| TASK LEAD   |               |           |           |      |        |
|             |               |           |           |      |        |
| M. QUIGGLE  |               |           |           |      |        |
| / D3000     |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/25/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| EXTENSION:  |               |           |           |      |        |
| 7/20/01 -   |               |           |           |      |        |
| FORMAL      |               |           |           |      |        |
| CLOSURE OF  |               |           |           |      |        |
| ALL ITEMS   |               |           |           |      |        |
|             |               |           |           |      |        |
| EXTENSION:  |               |           |           |      |        |
| 11/2/01 -   |               |           |           |      |        |
| FORMAL      |               |           |           |      |        |
| CLOSURE OF  |               |           |           |      |        |
| ALL ITEMS   |               |           |           |      |        |
|             |               |           |           |      |        |
| COMPLETE:   |               |           |           |      |        |
| 10/31/01    |               |           |           |      |        |
|             |               |           |           |      |        |
| \* CLOSURE  |               |           |           |      |        |
| STATEMENT:  |               |           |           |      |        |
|             |               |           |           |      |        |
| \-          |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| NO ISSUES   |               |           |           |      |        |
| WERE FOUND  |               |           |           |      |        |
| WITH THE    |               |           |           |      |        |
| MATERIAL OR |               |           |           |      |        |
| DESIGN OF   |               |           |           |      |        |
| THE PANEL.  |               |           |           |      |        |
|             |               |           |           |      |        |
| HOWEVER,    |               |           |           |      |        |
| THE         |               |           |           |      |        |
| OVERLOAD -  |               |           |           |      |        |
| FABRICATION |               |           |           |      |        |
| LEG OF THE  |               |           |           |      |        |
| FAULT TREE  |               |           |           |      |        |
| SHOWS       |               |           |           |      |        |
| DAMAGE      |               |           |           |      |        |
|             |               |           |           |      |        |
| OCCURRING   |               |           |           |      |        |
| AT MAF AS A |               |           |           |      |        |
| POSSIBLE    |               |           |           |      |        |
| AREA OF     |               |           |           |      |        |
| CONCERN.    |               |           |           |      |        |
| THREE       |               |           |           |      |        |
| POSSIBLE    |               |           |           |      |        |
| ITEMS       |               |           |           |      |        |
|             |               |           |           |      |        |
| WERE NOTED: |               |           |           |      |        |
|             |               |           |           |      |        |
| 1\.         |               |           |           |      |        |
| IMPROPER    |               |           |           |      |        |
| CLAMPING OF |               |           |           |      |        |
| PANEL IN    |               |           |           |      |        |
| L           |               |           |           |      |        |
| ONGITUDINAL |               |           |           |      |        |
| BARREL WELD |               |           |           |      |        |
| FIXTURE     |               |           |           |      |        |
|             |               |           |           |      |        |
| (5016 TOOL) |               |           |           |      |        |
|             |               |           |           |      |        |
| 2\.         |               |           |           |      |        |
| INADVERTENT |               |           |           |      |        |
| OBJECT      |               |           |           |      |        |
| OBSTRUCTION |               |           |           |      |        |
| DURING TANK |               |           |           |      |        |
| ROTATION IN |               |           |           |      |        |
| MAJOR       |               |           |           |      |        |
|             |               |           |           |      |        |
| WELD TOOLS. |               |           |           |      |        |
|             |               |           |           |      |        |
| 3\.         |               |           |           |      |        |
| I           |               |           |           |      |        |
| NADVERTENT, |               |           |           |      |        |
| UNREPORTED  |               |           |           |      |        |
| IMPACT      |               |           |           |      |        |
|             |               |           |           |      |        |
| TESTING WAS |               |           |           |      |        |
| CONDUCTED   |               |           |           |      |        |
| IN THE 5016 |               |           |           |      |        |
| TOOL TO     |               |           |           |      |        |
| DETERMINE   |               |           |           |      |        |
| IF DEBRIS   |               |           |           |      |        |
| OR OTHER    |               |           |           |      |        |
|             |               |           |           |      |        |
| CONDITIONS  |               |           |           |      |        |
| COULD       |               |           |           |      |        |
| GENERATE    |               |           |           |      |        |
| CRACKS IN   |               |           |           |      |        |
| TAPERED     |               |           |           |      |        |
| RIBS AND IT |               |           |           |      |        |
| WAS         |               |           |           |      |        |
| DETERMINED  |               |           |           |      |        |
|             |               |           |           |      |        |
| THAT THIS   |               |           |           |      |        |
| COULD       |               |           |           |      |        |
| OCCUR.      |               |           |           |      |        |
|             |               |           |           |      |        |
| IN ADDITION |               |           |           |      |        |
| THE TESTING |               |           |           |      |        |
| DETERMINED  |               |           |           |      |        |
| THAT THE    |               |           |           |      |        |
| FOLLOWING:  |               |           |           |      |        |
|             |               |           |           |      |        |
| 1\. DESIGN  |               |           |           |      |        |
| HAS THE     |               |           |           |      |        |
| REQUIRED    |               |           |           |      |        |
| PROOF TEST  |               |           |           |      |        |
| CAPABILITY  |               |           |           |      |        |
| &           |               |           |           |      |        |
| TEMPERATURE |               |           |           |      |        |
|             |               |           |           |      |        |
| CORRECTED   |               |           |           |      |        |
| FLIGHT      |               |           |           |      |        |
| CAPABILITY. |               |           |           |      |        |
|             |               |           |           |      |        |
| 2\.         |               |           |           |      |        |
| RESIDUAL    |               |           |           |      |        |
| STRESSES    |               |           |           |      |        |
| FROM        |               |           |           |      |        |
| FORMING     |               |           |           |      |        |
| WHEN        |               |           |           |      |        |
| COMBINED    |               |           |           |      |        |
| WITH PROOF  |               |           |           |      |        |
| TEST        |               |           |           |      |        |
|             |               |           |           |      |        |
| STRESSES    |               |           |           |      |        |
| WILL NOT    |               |           |           |      |        |
| CAUSE       |               |           |           |      |        |
| FAILURE.    |               |           |           |      |        |
|             |               |           |           |      |        |
| REF. FAULT  |               |           |           |      |        |
| TREE        |               |           |           |      |        |
| (CLOSED     |               |           |           |      |        |
| COPY) & THE |               |           |           |      |        |
| P           |               |           |           |      |        |
| RESENTATION |               |           |           |      |        |
| DATED       |               |           |           |      |        |
| 10/24/01    |               |           |           |      |        |
|             |               |           |           |      |        |
| B. PERFORM  |               |           |           |      |        |
| FAILURE     |               |           |           |      |        |
| ANALYSIS AT |               |           |           |      |        |
| THE REQUEST |               |           |           |      |        |
| OF FAULT    |               |           |           |      |        |
| TREE TEAM.  |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| D. BOLSTAD  |               |           |           |      |        |
| / D4600 -   |               |           |           |      |        |
| P.          |               |           |           |      |        |
| HINKELDEY / |               |           |           |      |        |
| D4600       |               |           |           |      |        |
|             |               |           |           |      |        |
| W.          |               |           |           |      |        |
| MATTHEESSEN |               |           |           |      |        |
| / D3741 -   |               |           |           |      |        |
| D.          |               |           |           |      |        |
| WES         |               |           |           |      |        |
| TPHAL/D3740 |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/25/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| EXTENSION:  |               |           |           |      |        |
| 7/20/01 -   |               |           |           |      |        |
| FORMAL      |               |           |           |      |        |
| CLOSURE OF  |               |           |           |      |        |
| ALL ITEMS   |               |           |           |      |        |
|             |               |           |           |      |        |
| \*          |               |           |           |      |        |
| EXTENSION:  |               |           |           |      |        |
| 11/31/01 -  |               |           |           |      |        |
| FORMAL      |               |           |           |      |        |
| CLOSURE OF  |               |           |           |      |        |
| ALL ITEMS   |               |           |           |      |        |
|             |               |           |           |      |        |
| \*          |               |           |           |      |        |
| COMPLETE:   |               |           |           |      |        |
| 11/14/01    |               |           |           |      |        |
|             |               |           |           |      |        |
| \* CLOSURE  |               |           |           |      |        |
| STATEMENT:  |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| MATERIAL    |               |           |           |      |        |
| MEETS       |               |           |           |      |        |
| ENGINEERING |               |           |           |      |        |
| RE          |               |           |           |      |        |
| QUIREMENTS. |               |           |           |      |        |
| FRACTURE    |               |           |           |      |        |
| SURFACES    |               |           |           |      |        |
| ARE         |               |           |           |      |        |
|             |               |           |           |      |        |
| CONSISTENT  |               |           |           |      |        |
| WITH A      |               |           |           |      |        |
| TENSILE     |               |           |           |      |        |
| OVER-LOAD   |               |           |           |      |        |
| SCENARIO.   |               |           |           |      |        |
| NO          |               |           |           |      |        |
| ANOMALIES   |               |           |           |      |        |
| WERE NOTED  |               |           |           |      |        |
|             |               |           |           |      |        |
| DURING THE  |               |           |           |      |        |
| ANALYSIS.   |               |           |           |      |        |
| FAILURE     |               |           |           |      |        |
| MODE WAS    |               |           |           |      |        |
| DUPLICATED  |               |           |           |      |        |
| USING 3 & 4 |               |           |           |      |        |
| POINT       |               |           |           |      |        |
|             |               |           |           |      |        |
| BENDING ON  |               |           |           |      |        |
| PANELS.     |               |           |           |      |        |
| BASED ON    |               |           |           |      |        |
| ANALYSIS OF |               |           |           |      |        |
| FRACTURE    |               |           |           |      |        |
| SURFACES,   |               |           |           |      |        |
| FRACTURE    |               |           |           |      |        |
|             |               |           |           |      |        |
| OCCURRED    |               |           |           |      |        |
| AFTER ALL   |               |           |           |      |        |
| PROCESSING  |               |           |           |      |        |
| AT THE      |               |           |           |      |        |
| SUPPLIERS.  |               |           |           |      |        |
| REF:        |               |           |           |      |        |
| ETT         |               |           |           |      |        |
| R-MS-01-026 |               |           |           |      |        |
|             |               |           |           |      |        |
| MATERIAL    |               |           |           |      |        |
| FAILURE     |               |           |           |      |        |
| ANALYSIS    |               |           |           |      |        |
| FOR ET-117  |               |           |           |      |        |
| LH2 CRACK   |               |           |           |      |        |
| RIB FAULT   |               |           |           |      |        |
| TREE,       |               |           |           |      |        |
| NOVEMBER    |               |           |           |      |        |
|             |               |           |           |      |        |
| 9, 2001.    |               |           |           |      |        |
|             |               |           |           |      |        |
| C. DEVELOP  |               |           |           |      |        |
| FLEET       |               |           |           |      |        |
| CLEARANCE   |               |           |           |      |        |
| RATIONAL    |               |           |           |      |        |
| INDEPENDENT |               |           |           |      |        |
| OF FAULT    |               |           |           |      |        |
|             |               |           |           |      |        |
| TREE        |               |           |           |      |        |
| INV         |               |           |           |      |        |
| ESTIGATION. |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| T. MCKEOUGH |               |           |           |      |        |
| / D3741 -   |               |           |           |      |        |
| D.          |               |           |           |      |        |
| WES         |               |           |           |      |        |
| TPHAL/D3740 |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/25/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| COMPLETE:   |               |           |           |      |        |
| 6/25/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| CLOSURE     |               |           |           |      |        |
| STATEMENT:  |               |           |           |      |        |
|             |               |           |           |      |        |
| \-          |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| SEE TASK    |               |           |           |      |        |
| III.        |               |           |           |      |        |
|             |               |           |           |      |        |
| C.1 PERFORM |               |           |           |      |        |
| AN          |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| OF RIBS AND |               |           |           |      |        |
| STRINGERS   |               |           |           |      |        |
| TO          |               |           |           |      |        |
|             |               |           |           |      |        |
| DETERMINE   |               |           |           |      |        |
| IF ANY      |               |           |           |      |        |
| OTHER       |               |           |           |      |        |
| CRACKS OR   |               |           |           |      |        |
| DAMAGE      |               |           |           |      |        |
| EXISTS      |               |           |           |      |        |
| (ET-117     |               |           |           |      |        |
|             |               |           |           |      |        |
| THRU 122).  |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| J. SPRAY /  |               |           |           |      |        |
| D3724 D.    |               |           |           |      |        |
| OWENS /     |               |           |           |      |        |
| D3720       |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/25/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| EXTENSION:  |               |           |           |      |        |
| 8/14/01 -   |               |           |           |      |        |
| COMPLETION  |               |           |           |      |        |
| OF ET-122   |               |           |           |      |        |
| BARREL #4   |               |           |           |      |        |
|             |               |           |           |      |        |
| EXTENSION:  |               |           |           |      |        |
| 11/2/01 -   |               |           |           |      |        |
| FORMAL      |               |           |           |      |        |
| CLOSURE OF  |               |           |           |      |        |
| ALL ITEMS   |               |           |           |      |        |
|             |               |           |           |      |        |
| COMPLETE:   |               |           |           |      |        |
| 10/31/01    |               |           |           |      |        |
|             |               |           |           |      |        |
| CLOSURE     |               |           |           |      |        |
| STATEMENT:  |               |           |           |      |        |
|             |               |           |           |      |        |
| \-          |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| NO          |               |           |           |      |        |
| ADDITIONAL  |               |           |           |      |        |
| CRACKS ON   |               |           |           |      |        |
| ET-117 WERE |               |           |           |      |        |
| NOTED.      |               |           |           |      |        |
| ET-118 THRU |               |           |           |      |        |
| 122 WERE    |               |           |           |      |        |
| ALSO        |               |           |           |      |        |
|             |               |           |           |      |        |
| INSPECTED   |               |           |           |      |        |
| AND NO      |               |           |           |      |        |
| CRACKED     |               |           |           |      |        |
| STRINGERS   |               |           |           |      |        |
| WERE        |               |           |           |      |        |
| DOCUMENTED. |               |           |           |      |        |
| REF.: J.    |               |           |           |      |        |
| SPRAY       |               |           |           |      |        |
|             |               |           |           |      |        |
| DATED       |               |           |           |      |        |
| 8/29/2001.  |               |           |           |      |        |
|             |               |           |           |      |        |
| \* C.2      |               |           |           |      |        |
| REVIEW NCDS |               |           |           |      |        |
| & SAFETY    |               |           |           |      |        |
| INCIDENT    |               |           |           |      |        |
| REPORTS FOR |               |           |           |      |        |
| ET-117 LH2  |               |           |           |      |        |
|             |               |           |           |      |        |
| TANK TO     |               |           |           |      |        |
| DETERMINE   |               |           |           |      |        |
| IF ANY      |               |           |           |      |        |
| INCIDENT    |               |           |           |      |        |
| OCCURRED.   |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| T.          |               |           |           |      |        |
| MCKEO       |               |           |           |      |        |
| UGH/D3741 - |               |           |           |      |        |
| D.          |               |           |           |      |        |
| WES         |               |           |           |      |        |
| TPHAL/D3740 |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/18/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| EXTENSION:  |               |           |           |      |        |
| 7/20/01 -   |               |           |           |      |        |
| FORMAL      |               |           |           |      |        |
| CLOSURE OF  |               |           |           |      |        |
| ALL ITEMS   |               |           |           |      |        |
|             |               |           |           |      |        |
| EXTENSION:  |               |           |           |      |        |
| 11/2/01 -   |               |           |           |      |        |
| FORMAL      |               |           |           |      |        |
| CLOSURE OF  |               |           |           |      |        |
| ALL ITEMS   |               |           |           |      |        |
|             |               |           |           |      |        |
| COMPLETE:   |               |           |           |      |        |
| 10/31/01    |               |           |           |      |        |
|             |               |           |           |      |        |
| CLOSURE     |               |           |           |      |        |
| STATEMENT:  |               |           |           |      |        |
|             |               |           |           |      |        |
| \-          |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| REVIEW      |               |           |           |      |        |
| SHOWED NO   |               |           |           |      |        |
| INCIDENCES  |               |           |           |      |        |
| IN THE AREA |               |           |           |      |        |
| OF INTEREST |               |           |           |      |        |
| ON ET-117   |               |           |           |      |        |
| LH2         |               |           |           |      |        |
|             |               |           |           |      |        |
| TANK. DATA  |               |           |           |      |        |
| WAS         |               |           |           |      |        |
| I           |               |           |           |      |        |
| NCORPORATED |               |           |           |      |        |
| INTO THE    |               |           |           |      |        |
| FAULT TREE. |               |           |           |      |        |
|             |               |           |           |      |        |
| \* C.3      |               |           |           |      |        |
| REVIEW NCD  |               |           |           |      |        |
| HISTORY FOR |               |           |           |      |        |
| PREVIOUS    |               |           |           |      |        |
| OCCURRENCES |               |           |           |      |        |
| OF CRACKS   |               |           |           |      |        |
|             |               |           |           |      |        |
| OR CRACK    |               |           |           |      |        |
| LIKE        |               |           |           |      |        |
| I           |               |           |           |      |        |
| NDICATIONS. |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| J.          |               |           |           |      |        |
| VARRIELLO / |               |           |           |      |        |
| D3741 - D.  |               |           |           |      |        |
| WES         |               |           |           |      |        |
| TPHAL/D3740 |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/18/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| COMPLETE:   |               |           |           |      |        |
| 6/18/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| CLOSURE     |               |           |           |      |        |
| STATEMENT:  |               |           |           |      |        |
|             |               |           |           |      |        |
| \-          |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| REVIEW WAS  |               |           |           |      |        |
| PERFORMED   |               |           |           |      |        |
| AND ALL     |               |           |           |      |        |
| PREVIOUS    |               |           |           |      |        |
| NON-C       |               |           |           |      |        |
| ONFORMANCES |               |           |           |      |        |
| WERE MAPPED |               |           |           |      |        |
| AND         |               |           |           |      |        |
|             |               |           |           |      |        |
| PROVIDED TO |               |           |           |      |        |
| THE FAULT   |               |           |           |      |        |
| TREE BLOCK  |               |           |           |      |        |
| LEADS.      |               |           |           |      |        |
|             |               |           |           |      |        |
| \* C.4      |               |           |           |      |        |
| DEVELOP AN  |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| METHOD FOR  |               |           |           |      |        |
| BUILT       |               |           |           |      |        |
| TANKS.      |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| T. MCKEOUGH |               |           |           |      |        |
| / D3741 &   |               |           |           |      |        |
| S. MCEVOY / |               |           |           |      |        |
| 3742        |               |           |           |      |        |
|             |               |           |           |      |        |
| D. WESTPHAL |               |           |           |      |        |
| / D3740     |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/25/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| COMPLETE:   |               |           |           |      |        |
| 7/27/01     |               |           |           |      |        |
| FORMAL      |               |           |           |      |        |
| CLOSURE IN  |               |           |           |      |        |
| PROCESS     |               |           |           |      |        |
|             |               |           |           |      |        |
| EXTENSION:  |               |           |           |      |        |
| 11/2/01 -   |               |           |           |      |        |
| FORMAL      |               |           |           |      |        |
| CLOSURE OF  |               |           |           |      |        |
| ALL ITEMS   |               |           |           |      |        |
|             |               |           |           |      |        |
| COMPLETE:   |               |           |           |      |        |
| 10/31/01    |               |           |           |      |        |
|             |               |           |           |      |        |
| CLOSURE     |               |           |           |      |        |
| STATEMENT:  |               |           |           |      |        |
|             |               |           |           |      |        |
| \-          |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| SEVERAL     |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| METHODS     |               |           |           |      |        |
| WERE        |               |           |           |      |        |
| EVALUATED.  |               |           |           |      |        |
| THE MOST    |               |           |           |      |        |
| EFFICIENT   |               |           |           |      |        |
| VISUAL      |               |           |           |      |        |
|             |               |           |           |      |        |
| METHOD WAS  |               |           |           |      |        |
| A           |               |           |           |      |        |
| HORIZONTAL  |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| WITH TANK   |               |           |           |      |        |
| ENTRY USING |               |           |           |      |        |
| A SPOTTING  |               |           |           |      |        |
|             |               |           |           |      |        |
| SCOPE AS    |               |           |           |      |        |
| NECESSARY.  |               |           |           |      |        |
| A VERTICAL  |               |           |           |      |        |
| VISUAL      |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| FROM THE    |               |           |           |      |        |
| 2058 FRAME  |               |           |           |      |        |
|             |               |           |           |      |        |
| USING THE   |               |           |           |      |        |
| SAME        |               |           |           |      |        |
| SPOTTER     |               |           |           |      |        |
| SCOPE       |               |           |           |      |        |
| PRODUCED    |               |           |           |      |        |
| ACCEPTABLE  |               |           |           |      |        |
| RESULTS,    |               |           |           |      |        |
| HOWEVER,    |               |           |           |      |        |
| ONE         |               |           |           |      |        |
|             |               |           |           |      |        |
| RIB ABOVE   |               |           |           |      |        |
| EACH \"T\"  |               |           |           |      |        |
| RING WAS    |               |           |           |      |        |
| BLOCKED     |               |           |           |      |        |
| FROM VIEW.  |               |           |           |      |        |
| AN          |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| PERFORMED   |               |           |           |      |        |
|             |               |           |           |      |        |
| FROM THE    |               |           |           |      |        |
| FWD END OF  |               |           |           |      |        |
| THE LH2     |               |           |           |      |        |
| TANK        |               |           |           |      |        |
| WITHOUT     |               |           |           |      |        |
| MAKING A    |               |           |           |      |        |
| TANK ENTRY, |               |           |           |      |        |
| PROVIDED    |               |           |           |      |        |
|             |               |           |           |      |        |
| VISUAL      |               |           |           |      |        |
| AC          |               |           |           |      |        |
| CESSIBILITY |               |           |           |      |        |
| TO THE RIBS |               |           |           |      |        |
| THAT COULD  |               |           |           |      |        |
| NOT BE      |               |           |           |      |        |
| INSPECTED   |               |           |           |      |        |
| FROM THE    |               |           |           |      |        |
|             |               |           |           |      |        |
| AFT END.    |               |           |           |      |        |
|             |               |           |           |      |        |
| THROUGH THE |               |           |           |      |        |
| TANK, (DUAL |               |           |           |      |        |
| WALL) X-RAY |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| WAS         |               |           |           |      |        |
| DEVELOPED   |               |           |           |      |        |
| AND COULD   |               |           |           |      |        |
|             |               |           |           |      |        |
| DETECT A    |               |           |           |      |        |
| CRACK OF    |               |           |           |      |        |
| THE TYPE    |               |           |           |      |        |
| SEEN ON     |               |           |           |      |        |
| ET-117 LH2  |               |           |           |      |        |
| TANK.       |               |           |           |      |        |
|             |               |           |           |      |        |
| C.5 REVIEW  |               |           |           |      |        |
| BUILD PAPER |               |           |           |      |        |
| AND         |               |           |           |      |        |
| INTERVIEW   |               |           |           |      |        |
| INSPECTORS  |               |           |           |      |        |
| AND         |               |           |           |      |        |
|             |               |           |           |      |        |
| PR          |               |           |           |      |        |
| ACTITIONERS |               |           |           |      |        |
| TO          |               |           |           |      |        |
| DETERMINE   |               |           |           |      |        |
| NUMBER AND  |               |           |           |      |        |
| TYPE OF     |               |           |           |      |        |
|             |               |           |           |      |        |
| I           |               |           |           |      |        |
| NSPECTIONS. |               |           |           |      |        |
|             |               |           |           |      |        |
| RESP        |               |           |           |      |        |
| ONSIBILITY: |               |           |           |      |        |
| T. MCKEOUGH |               |           |           |      |        |
| / D3741 -   |               |           |           |      |        |
| D.          |               |           |           |      |        |
| WES         |               |           |           |      |        |
| TPHAL/D3740 |               |           |           |      |        |
|             |               |           |           |      |        |
| ECD:        |               |           |           |      |        |
| 6/18/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| COMPLETE:   |               |           |           |      |        |
| 6/18/01     |               |           |           |      |        |
|             |               |           |           |      |        |
| CLOSURE     |               |           |           |      |        |
| STATEMENT:  |               |           |           |      |        |
|             |               |           |           |      |        |
| \-          |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| NUMBER AND  |               |           |           |      |        |
| TYPE OF     |               |           |           |      |        |
| INSPECTIONS |               |           |           |      |        |
| WERE        |               |           |           |      |        |
| IDENTIFIED  |               |           |           |      |        |
| AND ADDED   |               |           |           |      |        |
| TO THE      |               |           |           |      |        |
| ET-117      |               |           |           |      |        |
|             |               |           |           |      |        |
| LH2 TANK    |               |           |           |      |        |
| PRODUCTION  |               |           |           |      |        |
| FAULT TREE  |               |           |           |      |        |
| FLOW CHART. |               |           |           |      |        |
| INTERVIEWS  |               |           |           |      |        |
| WITH        |               |           |           |      |        |
|             |               |           |           |      |        |
| PR          |               |           |           |      |        |
| ACTITIONERS |               |           |           |      |        |
| WERE        |               |           |           |      |        |
| PERFORMED   |               |           |           |      |        |
| TO          |               |           |           |      |        |
| DETERMINE   |               |           |           |      |        |
| EF          |               |           |           |      |        |
| FECTIVENESS |               |           |           |      |        |
| OF POST     |               |           |           |      |        |
| PROOF       |               |           |           |      |        |
|             |               |           |           |      |        |
| I           |               |           |           |      |        |
| NSPECTIONS. |               |           |           |      |        |
| IT WAS A    |               |           |           |      |        |
| CONSENSUS   |               |           |           |      |        |
| AMONG THE   |               |           |           |      |        |
| PR          |               |           |           |      |        |
| ACTITIONERS |               |           |           |      |        |
| THAT THE    |               |           |           |      |        |
|             |               |           |           |      |        |
| CLEANING    |               |           |           |      |        |
| /INSPECTION |               |           |           |      |        |
| WOULD       |               |           |           |      |        |
| DETECT THIS |               |           |           |      |        |
| TYPE OF     |               |           |           |      |        |
| DEFECT.     |               |           |           |      |        |
| THIS STEP   |               |           |           |      |        |
| IN THE      |               |           |           |      |        |
|             |               |           |           |      |        |
| PROCESS IS  |               |           |           |      |        |
| PERFORMED   |               |           |           |      |        |
| BY THREE    |               |           |           |      |        |
| DIFFERENT   |               |           |           |      |        |
| OR          |               |           |           |      |        |
| GANIZATIONS |               |           |           |      |        |
| (PRODUCTION |               |           |           |      |        |
|             |               |           |           |      |        |
| PR          |               |           |           |      |        |
| ACTITIONER, |               |           |           |      |        |
| QUALITY     |               |           |           |      |        |
| CONTROL     |               |           |           |      |        |
| INSPECTOR   |               |           |           |      |        |
| AND A       |               |           |           |      |        |
| MEMBER OF   |               |           |           |      |        |
| DCMA).      |               |           |           |      |        |
|             |               |           |           |      |        |
| CAUSE:      |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-\-      |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| INADVERTENT |               |           |           |      |        |
| DAMAGE TO   |               |           |           |      |        |
| BARREL      |               |           |           |      |        |
| SECTION     |               |           |           |      |        |
| DURING MAF  |               |           |           |      |        |
| F           |               |           |           |      |        |
| ABRICATION. |               |           |           |      |        |
|             |               |           |           |      |        |
| TASK II     |               |           |           |      |        |
| CORRECTIVE  |               |           |           |      |        |
| ACTION      |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| NONE        |               |           |           |      |        |
| REQUIRED,   |               |           |           |      |        |
| THIS IS AN  |               |           |           |      |        |
| EXPLAINED   |               |           |           |      |        |
| CLOSURE     |               |           |           |      |        |
| CAPS. SEE   |               |           |           |      |        |
| CLEARANCE   |               |           |           |      |        |
| OF          |               |           |           |      |        |
|             |               |           |           |      |        |
| EFF         |               |           |           |      |        |
| ECTIVITIES, |               |           |           |      |        |
| TASK III.   |               |           |           |      |        |
|             |               |           |           |      |        |
| TASK III    |               |           |           |      |        |
| CLEARANCE   |               |           |           |      |        |
| OF          |               |           |           |      |        |
| EF          |               |           |           |      |        |
| FECTIVITIES |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-\-\     |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| \* FLIGHT   |               |           |           |      |        |
| RATIONALE:  |               |           |           |      |        |
|             |               |           |           |      |        |
| 0 FAULT     |               |           |           |      |        |
| TREE TEAM   |               |           |           |      |        |
| AND SENIOR  |               |           |           |      |        |
| REVIEW      |               |           |           |      |        |
| BOARD       |               |           |           |      |        |
| CONCLUDED   |               |           |           |      |        |
| THAT THIS   |               |           |           |      |        |
| WAS         |               |           |           |      |        |
|             |               |           |           |      |        |
| AN ISOLATED |               |           |           |      |        |
| EVENT AND   |               |           |           |      |        |
| NOT THE     |               |           |           |      |        |
| RESULT OF A |               |           |           |      |        |
| SYSTEMIC    |               |           |           |      |        |
| PROBLEM.    |               |           |           |      |        |
|             |               |           |           |      |        |
| \- ET       |               |           |           |      |        |
| DESIGN AND  |               |           |           |      |        |
| MATERIALS   |               |           |           |      |        |
| WERE        |               |           |           |      |        |
| EXONERATED  |               |           |           |      |        |
| AS          |               |           |           |      |        |
| C           |               |           |           |      |        |
| ONTRIBUTORS |               |           |           |      |        |
| TO THE      |               |           |           |      |        |
|             |               |           |           |      |        |
| ET-117      |               |           |           |      |        |
| ANOMALY.    |               |           |           |      |        |
|             |               |           |           |      |        |
| \- RIGOROUS |               |           |           |      |        |
| REVIEW OF   |               |           |           |      |        |
| THE PROCESS |               |           |           |      |        |
| I           |               |           |           |      |        |
| NSTRUCTIONS |               |           |           |      |        |
| FOR POST    |               |           |           |      |        |
| PROOF       |               |           |           |      |        |
|             |               |           |           |      |        |
| PROCESSING  |               |           |           |      |        |
| FOUND NO    |               |           |           |      |        |
| IN          |               |           |           |      |        |
| ADEQUACIES. |               |           |           |      |        |
|             |               |           |           |      |        |
| \- FAULT    |               |           |           |      |        |
| TREE AND    |               |           |           |      |        |
| FRACTURE    |               |           |           |      |        |
| FACE        |               |           |           |      |        |
| ANALYSIS    |               |           |           |      |        |
| CONCLUDED   |               |           |           |      |        |
| THAT THE    |               |           |           |      |        |
| ET-         |               |           |           |      |        |
|             |               |           |           |      |        |
| 117 DAMAGE  |               |           |           |      |        |
| EVENT       |               |           |           |      |        |
| OCCURRED    |               |           |           |      |        |
| DURING      |               |           |           |      |        |
| PROCESSING, |               |           |           |      |        |
| PRIOR TO    |               |           |           |      |        |
| PROOF       |               |           |           |      |        |
|             |               |           |           |      |        |
| TEST.       |               |           |           |      |        |
|             |               |           |           |      |        |
| 0 THE FIRST |               |           |           |      |        |
| OF THREE    |               |           |           |      |        |
| PLANNED     |               |           |           |      |        |
| POST-PROOF  |               |           |           |      |        |
| CLEANING    |               |           |           |      |        |
| AND         |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
|             |               |           |           |      |        |
| STEPS       |               |           |           |      |        |
| IDENTIFIED  |               |           |           |      |        |
| CRACKS.     |               |           |           |      |        |
|             |               |           |           |      |        |
| 0           |               |           |           |      |        |
| IN          |               |           |           |      |        |
| VESTIGATION |               |           |           |      |        |
| VALIDATED   |               |           |           |      |        |
| PROOF TEST  |               |           |           |      |        |
| AND POST    |               |           |           |      |        |
| PROOF       |               |           |           |      |        |
| INSPECTIONS |               |           |           |      |        |
|             |               |           |           |      |        |
| FOR         |               |           |           |      |        |
| CE          |               |           |           |      |        |
| RTIFICATION |               |           |           |      |        |
| OF TANKS.   |               |           |           |      |        |
|             |               |           |           |      |        |
| \* METHOD   |               |           |           |      |        |
| OF          |               |           |           |      |        |
| DETECTION   |               |           |           |      |        |
| IN FLIGHT:  |               |           |           |      |        |
|             |               |           |           |      |        |
| NONE, SEE   |               |           |           |      |        |
| FLIGHT      |               |           |           |      |        |
| RATIONALE   |               |           |           |      |        |
|             |               |           |           |      |        |
| \* MISSION  |               |           |           |      |        |
| EFFECT:     |               |           |           |      |        |
|             |               |           |           |      |        |
| FRACTURE    |               |           |           |      |        |
| TESTING OF  |               |           |           |      |        |
| THE CRACKED |               |           |           |      |        |
| RIBS        |               |           |           |      |        |
| D           |               |           |           |      |        |
| EMONSTRATED |               |           |           |      |        |
| THAT A TANK |               |           |           |      |        |
|             |               |           |           |      |        |
| WITH THESE  |               |           |           |      |        |
| CRACKS      |               |           |           |      |        |
| COULD       |               |           |           |      |        |
| COMPLETE    |               |           |           |      |        |
| MISSION.    |               |           |           |      |        |
| REF:        |               |           |           |      |        |
| ETT         |               |           |           |      |        |
| R-MS-01-026 |               |           |           |      |        |
| -           |               |           |           |      |        |
|             |               |           |           |      |        |
| MATERIAL    |               |           |           |      |        |
| FAILURE     |               |           |           |      |        |
| ANALYSIS    |               |           |           |      |        |
| FOR ET-117  |               |           |           |      |        |
| LH2 CRACK   |               |           |           |      |        |
| RIB FAULT   |               |           |           |      |        |
| TREE,       |               |           |           |      |        |
|             |               |           |           |      |        |
| NOVEMBER 9, |               |           |           |      |        |
| 2001.       |               |           |           |      |        |
|             |               |           |           |      |        |
| \*          |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| POINT TO    |               |           |           |      |        |
| FIND        |               |           |           |      |        |
| DEFECT:     |               |           |           |      |        |
|             |               |           |           |      |        |
| POST PROOF  |               |           |           |      |        |
| CLEAN &     |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| OF LH2      |               |           |           |      |        |
| INTERIOR,   |               |           |           |      |        |
| IS A SERIES |               |           |           |      |        |
| OF          |               |           |           |      |        |
|             |               |           |           |      |        |
| CLEANING &  |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| STEPS       |               |           |           |      |        |
| PERFORMED   |               |           |           |      |        |
| IN          |               |           |           |      |        |
| DEPENDENTLY |               |           |           |      |        |
| BY THREE    |               |           |           |      |        |
|             |               |           |           |      |        |
| ORG         |               |           |           |      |        |
| ANIZATIONS, |               |           |           |      |        |
| SEE TASK    |               |           |           |      |        |
| I.C.5.      |               |           |           |      |        |
|             |               |           |           |      |        |
| TASK IV     |               |           |           |      |        |
| CAPS        |               |           |           |      |        |
| CLOSURE     |               |           |           |      |        |
| SUMMARY     |               |           |           |      |        |
|             |               |           |           |      |        |
| \-\-\-      |               |           |           |      |        |
| \-\-\-\-\-\ |               |           |           |      |        |
| -\-\-\-\-\- |               |           |           |      |        |
| \-\-\-\-\-- |               |           |           |      |        |
|             |               |           |           |      |        |
| \*          |               |           |           |      |        |
|             |               |           |           |      |        |
| DURING POST |               |           |           |      |        |
| PROOF       |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
| (SHAKEDOWN) |               |           |           |      |        |
| OF THE LH2  |               |           |           |      |        |
| TANK FOR    |               |           |           |      |        |
| ET-117,     |               |           |           |      |        |
|             |               |           |           |      |        |
| TWO CRACKS  |               |           |           |      |        |
| WERE FOUND  |               |           |           |      |        |
| ON RIBS     |               |           |           |      |        |
| C-35 & C-37 |               |           |           |      |        |
| (BARREL #3) |               |           |           |      |        |
| NEXT TO THE |               |           |           |      |        |
| S-12        |               |           |           |      |        |
|             |               |           |           |      |        |
| STRINGER ON |               |           |           |      |        |
| THE ISL.    |               |           |           |      |        |
| THIS IS     |               |           |           |      |        |
| NEXT TO THE |               |           |           |      |        |
| HB3-8 WELD  |               |           |           |      |        |
| AT STATION  |               |           |           |      |        |
| 1377,       |               |           |           |      |        |
|             |               |           |           |      |        |
| ON BARREL   |               |           |           |      |        |
| \# 3. A     |               |           |           |      |        |
| THREE POINT |               |           |           |      |        |
| APPROACH    |               |           |           |      |        |
| WAS USED TO |               |           |           |      |        |
| INVESTIGATE |               |           |           |      |        |
| THIS        |               |           |           |      |        |
|             |               |           |           |      |        |
| INCIDENT &  |               |           |           |      |        |
| PROVIDE     |               |           |           |      |        |
| FLEET       |               |           |           |      |        |
| CLEARANCE:  |               |           |           |      |        |
|             |               |           |           |      |        |
| 1\. FORMAL  |               |           |           |      |        |
| FAULT TREE  |               |           |           |      |        |
|             |               |           |           |      |        |
| 2\.         |               |           |           |      |        |
| INDEPENDENT |               |           |           |      |        |
| FAILURE     |               |           |           |      |        |
| ANALYSIS    |               |           |           |      |        |
|             |               |           |           |      |        |
| 3\.         |               |           |           |      |        |
| DETERMINE   |               |           |           |      |        |
| FLEET       |               |           |           |      |        |
| CLEARANCE / |               |           |           |      |        |
| FLIGHT      |               |           |           |      |        |
| RATIONALE   |               |           |           |      |        |
|             |               |           |           |      |        |
| THE FAULT   |               |           |           |      |        |
| TREE WAS    |               |           |           |      |        |
| DIVIDED     |               |           |           |      |        |
| INTO THREE  |               |           |           |      |        |
| AREAS AND   |               |           |           |      |        |
| RESULTED IN |               |           |           |      |        |
| THE         |               |           |           |      |        |
|             |               |           |           |      |        |
| FOLLOWING   |               |           |           |      |        |
| C           |               |           |           |      |        |
| ONCLUSIONS: |               |           |           |      |        |
|             |               |           |           |      |        |
| 1\.         |               |           |           |      |        |
| MATERIALS - |               |           |           |      |        |
| THE LH2     |               |           |           |      |        |
| BARREL      |               |           |           |      |        |
| PANEL MET   |               |           |           |      |        |
| ALL         |               |           |           |      |        |
| SP          |               |           |           |      |        |
| ECIFICATION |               |           |           |      |        |
|             |               |           |           |      |        |
| RE          |               |           |           |      |        |
| QUIREMENTS. |               |           |           |      |        |
|             |               |           |           |      |        |
| 2\.         |               |           |           |      |        |
| DESIGN -    |               |           |           |      |        |
| THE DESIGN  |               |           |           |      |        |
| OF THE      |               |           |           |      |        |
| PANEL IS    |               |           |           |      |        |
| ADEQUATE &  |               |           |           |      |        |
| MEETS ALL   |               |           |           |      |        |
|             |               |           |           |      |        |
| RE          |               |           |           |      |        |
| QUIREMENTS. |               |           |           |      |        |
|             |               |           |           |      |        |
| 3\.         |               |           |           |      |        |
| OVERLOAD /  |               |           |           |      |        |
| FA          |               |           |           |      |        |
| BRICATION - |               |           |           |      |        |
| THE         |               |           |           |      |        |
| POSSIBILITY |               |           |           |      |        |
| OF          |               |           |           |      |        |
| INADVERTENT |               |           |           |      |        |
| &           |               |           |           |      |        |
|             |               |           |           |      |        |
| UNREPORTED  |               |           |           |      |        |
| DAMAGE      |               |           |           |      |        |
| EXISTS.     |               |           |           |      |        |
| ADDITIONAL  |               |           |           |      |        |
| TESTING     |               |           |           |      |        |
| CONFIRMED   |               |           |           |      |        |
| THAT        |               |           |           |      |        |
|             |               |           |           |      |        |
| SEVERAL     |               |           |           |      |        |
| DAMAGE      |               |           |           |      |        |
| SCENARIOS   |               |           |           |      |        |
| AT MAF WERE |               |           |           |      |        |
| POSSIBLE.   |               |           |           |      |        |
|             |               |           |           |      |        |
| INDEPENDENT |               |           |           |      |        |
| FAILURE     |               |           |           |      |        |
| ANALYSIS    |               |           |           |      |        |
| SHOWED THE  |               |           |           |      |        |
| FOLLOWING:  |               |           |           |      |        |
|             |               |           |           |      |        |
| 1\. THE     |               |           |           |      |        |
| MATERIAL    |               |           |           |      |        |
| MEETS ALL   |               |           |           |      |        |
| SP          |               |           |           |      |        |
| ECIFICATION |               |           |           |      |        |
| RE          |               |           |           |      |        |
| QUIREMENTS. |               |           |           |      |        |
|             |               |           |           |      |        |
| 2\. THE     |               |           |           |      |        |
| FRACTURE    |               |           |           |      |        |
| SURFACES    |               |           |           |      |        |
| ARE         |               |           |           |      |        |
| CONSISTENT  |               |           |           |      |        |
| WITH THE    |               |           |           |      |        |
| PROPOSED    |               |           |           |      |        |
| DAMAGE      |               |           |           |      |        |
|             |               |           |           |      |        |
| SCENARIOS   |               |           |           |      |        |
| AND COULD   |               |           |           |      |        |
| ONLY        |               |           |           |      |        |
| OCCURRED AT |               |           |           |      |        |
| MAF PRIOR   |               |           |           |      |        |
| TO PROOF    |               |           |           |      |        |
| TEST.       |               |           |           |      |        |
|             |               |           |           |      |        |
| 3\. NO      |               |           |           |      |        |
| AB          |               |           |           |      |        |
| NORMALITIES |               |           |           |      |        |
| WERE NOTED. |               |           |           |      |        |
|             |               |           |           |      |        |
| FLEET       |               |           |           |      |        |
| CLEAR       |               |           |           |      |        |
| ANCE/FLIGHT |               |           |           |      |        |
| RATIONALE   |               |           |           |      |        |
| WITH INPUT  |               |           |           |      |        |
| FROM THE    |               |           |           |      |        |
| FAULT TREE  |               |           |           |      |        |
| GROUP       |               |           |           |      |        |
|             |               |           |           |      |        |
| & FAILURE   |               |           |           |      |        |
| ANALYSIS    |               |           |           |      |        |
| GROUP       |               |           |           |      |        |
| DETERMINED  |               |           |           |      |        |
| THAT:       |               |           |           |      |        |
|             |               |           |           |      |        |
| 1\. THIS    |               |           |           |      |        |
| WAS AN      |               |           |           |      |        |
| ISOLATED    |               |           |           |      |        |
| EVENT AND   |               |           |           |      |        |
| NOT THE     |               |           |           |      |        |
| RESULT OF A |               |           |           |      |        |
| SYSTEMIC    |               |           |           |      |        |
|             |               |           |           |      |        |
| PROBLEM.    |               |           |           |      |        |
|             |               |           |           |      |        |
| 2\. THE     |               |           |           |      |        |
| FIRST OF    |               |           |           |      |        |
| THREE       |               |           |           |      |        |
| PLANNED     |               |           |           |      |        |
| POST-PROOF  |               |           |           |      |        |
| CLEANING    |               |           |           |      |        |
| AND         |               |           |           |      |        |
| INSPECTION  |               |           |           |      |        |
|             |               |           |           |      |        |
| STEPS       |               |           |           |      |        |
| IDENTIFIED  |               |           |           |      |        |
| CRACKS.     |               |           |           |      |        |
|             |               |           |           |      |        |
| 3\. THE     |               |           |           |      |        |
| IN          |               |           |           |      |        |
| VESTIGATION |               |           |           |      |        |
| VALIDATED   |               |           |           |      |        |
| PROOF TEST  |               |           |           |      |        |
| AND POST    |               |           |           |      |        |
| PROOF       |               |           |           |      |        |
|             |               |           |           |      |        |
| INSPECTIONS |               |           |           |      |        |
| FOR         |               |           |           |      |        |
| CE          |               |           |           |      |        |
| RTIFICATION |               |           |           |      |        |
| OF TANKS.   |               |           |           |      |        |
|             |               |           |           |      |        |
| IN ADDITION |               |           |           |      |        |
| TWO METHODS |               |           |           |      |        |
| WERE        |               |           |           |      |        |
| DEVELOPED   |               |           |           |      |        |
| TO INSPECT  |               |           |           |      |        |
| TANKS FOR   |               |           |           |      |        |
| DAMAGE POST |               |           |           |      |        |
|             |               |           |           |      |        |
| PROOF. THIS |               |           |           |      |        |
| WAS A       |               |           |           |      |        |
| SERIES OF   |               |           |           |      |        |
| ASSISTED    |               |           |           |      |        |
| VISUAL      |               |           |           |      |        |
| INSPECTIONS |               |           |           |      |        |
| IN VARIOUS  |               |           |           |      |        |
|             |               |           |           |      |        |
| TANK        |               |           |           |      |        |
| ATTITUDES & |               |           |           |      |        |
| A DOUBLE    |               |           |           |      |        |
| WALL X-RAY  |               |           |           |      |        |
| METHOD      |               |           |           |      |        |
| BASED ON    |               |           |           |      |        |
| THE         |               |           |           |      |        |
| FINDINGS    |               |           |           |      |        |
|             |               |           |           |      |        |
| IMP         |               |           |           |      |        |
| LEMENTATION |               |           |           |      |        |
| WAS NOT     |               |           |           |      |        |
| NECESSARY.  |               |           |           |      |        |
|             |               |           |           |      |        |
| \*\*\*\*\*  |               |           |           |      |        |
| \*\*\*\*\*\ |               |           |           |      |        |
| *\*\*\*\*\* |               |           |           |      |        |
| \*\*\*\*\*\ |               |           |           |      |        |
| *\*\*\*\*\* |               |           |           |      |        |
| \*\*\*\*\*\ |               |           |           |      |        |
| *\*\*\*\*\* |               |           |           |      |        |
| \*\*\*\*\*\ |               |           |           |      |        |
| *\*\*\*\*\* |               |           |           |      |        |
| \*\*\*\*\*\ |               |           |           |      |        |
| *\*\*\*\*\* |               |           |           |      |        |
|             |               |           |           |      |        |
| THIS        |               |           |           |      |        |
| ADDENDUM    |               |           |           |      |        |
| WAS         |               |           |           |      |        |
| REQUESTED   |               |           |           |      |        |
| BY NASA     |               |           |           |      |        |
| S&MA.       |               |           |           |      |        |
|             |               |           |           |      |        |
| TO REDUCE   |               |           |           |      |        |
| THE RISK OF |               |           |           |      |        |
| L02/LH2     |               |           |           |      |        |
| TANK DAMAGE |               |           |           |      |        |
| OCCURRING   |               |           |           |      |        |
| AFTER PROOF |               |           |           |      |        |
| TEST        |               |           |           |      |        |
|             |               |           |           |      |        |
| BARREL      |               |           |           |      |        |
| CRACK THE   |               |           |           |      |        |
| FOLLOWING   |               |           |           |      |        |
| E           |               |           |           |      |        |
| NHANCEMENTS |               |           |           |      |        |
| WERE        |               |           |           |      |        |
| IDENTIFIED  |               |           |           |      |        |
| DURING THE  |               |           |           |      |        |
| ET          |               |           |           |      |        |
|             |               |           |           |      |        |
| 117         |               |           |           |      |        |
| INV         |               |           |           |      |        |
| ESTIGATION. |               |           |           |      |        |
|             |               |           |           |      |        |
| 1\. ANGLE   |               |           |           |      |        |
| IRONS HAVE  |               |           |           |      |        |
| BEEN        |               |           |           |      |        |
| INSTALLED   |               |           |           |      |        |
| AT THE 7077 |               |           |           |      |        |
| AND 7419    |               |           |           |      |        |
| TOOLS TO    |               |           |           |      |        |
|             |               |           |           |      |        |
| PREVENT A   |               |           |           |      |        |
| VEHICLE OR  |               |           |           |      |        |
| DOLLY FROM  |               |           |           |      |        |
| COMING INTO |               |           |           |      |        |
| CONTACT     |               |           |           |      |        |
| WITH THE    |               |           |           |      |        |
| TANK.       |               |           |           |      |        |
|             |               |           |           |      |        |
| 2\. THE     |               |           |           |      |        |
| MPPS HAVE   |               |           |           |      |        |
| BEEN        |               |           |           |      |        |
| REVISED TO  |               |           |           |      |        |
| SPECIFY THE |               |           |           |      |        |
| FOLLOWING   |               |           |           |      |        |
| AT THE 7077 |               |           |           |      |        |
|             |               |           |           |      |        |
| (LH2) AND   |               |           |           |      |        |
| THE         |               |           |           |      |        |
| 7419(LO2)   |               |           |           |      |        |
| TOOL;       |               |           |           |      |        |
|             |               |           |           |      |        |
| A. VERIFY   |               |           |           |      |        |
| CLEARANCE   |               |           |           |      |        |
| PRIOR TO    |               |           |           |      |        |
| ROTATION    |               |           |           |      |        |
|             |               |           |           |      |        |
| B.          |               |           |           |      |        |
| LOC         |               |           |           |      |        |
| KOUT/TAGOUT |               |           |           |      |        |
| ROTATION    |               |           |           |      |        |
| WHEN NOT IN |               |           |           |      |        |
| USE         |               |           |           |      |        |
|             |               |           |           |      |        |
| C. INSTALL  |               |           |           |      |        |
| BARRICADE   |               |           |           |      |        |
| WITH POST   |               |           |           |      |        |
| AND CHAINS  |               |           |           |      |        |
|             |               |           |           |      |        |
| D. POST     |               |           |           |      |        |
| SIGNAGE     |               |           |           |      |        |
|             |               |           |           |      |        |
| 3\. VIDEO   |               |           |           |      |        |
| S           |               |           |           |      |        |
| URVEILLANCE |               |           |           |      |        |
| SCHEDULED   |               |           |           |      |        |
| TO BE       |               |           |           |      |        |
| IMPLEMENTED |               |           |           |      |        |
|             |               |           |           |      |        |
| 4\. THE     |               |           |           |      |        |
| FOLLOWING   |               |           |           |      |        |
| MAJOR TANK  |               |           |           |      |        |
| MOVES WILL  |               |           |           |      |        |
| BE          |               |           |           |      |        |
| WITNESSED   |               |           |           |      |        |
| BY QC:      |               |           |           |      |        |
|             |               |           |           |      |        |
| LO2 TANK    |               |           |           |      |        |
| MAJOR MOVES |               |           |           |      |        |
|             |               |           |           |      |        |
| \*7419 TO   |               |           |           |      |        |
| CELL \"F\"  |               |           |           |      |        |
| 2000-166    |               |           |           |      |        |
|             |               |           |           |      |        |
| CELL \"F\"  |               |           |           |      |        |
| TO 7419     |               |           |           |      |        |
| 2000-289    |               |           |           |      |        |
|             |               |           |           |      |        |
| 7419 TO     |               |           |           |      |        |
| CELL \"E\"  |               |           |           |      |        |
| 2000-290    |               |           |           |      |        |
|             |               |           |           |      |        |
| LH2 TANK    |               |           |           |      |        |
| MAJOR MOVES |               |           |           |      |        |
|             |               |           |           |      |        |
| 5068 TO     |               |           |           |      |        |
| BUCKS       |               |           |           |      |        |
| 4000-503    |               |           |           |      |        |
|             |               |           |           |      |        |
| BUCKS TO    |               |           |           |      |        |
| 7077        |               |           |           |      |        |
| 4000-119    |               |           |           |      |        |
|             |               |           |           |      |        |
| 7077 TO     |               |           |           |      |        |
| BUCKS       |               |           |           |      |        |
| 4000-517    |               |           |           |      |        |
|             |               |           |           |      |        |
| \*BUCKS TO  |               |           |           |      |        |
| 451         |               |           |           |      |        |
| 4000-502    |               |           |           |      |        |
|             |               |           |           |      |        |
| 451 TO      |               |           |           |      |        |
| BUCKS       |               |           |           |      |        |
| 4000-201    |               |           |           |      |        |
|             |               |           |           |      |        |
| BUCKS TO    |               |           |           |      |        |
| CELL \"P\"  |               |           |           |      |        |
| 4000-014    |               |           |           |      |        |
|             |               |           |           |      |        |
| CELL \"P\"  |               |           |           |      |        |
| TO CELL     |               |           |           |      |        |
| \"N\"       |               |           |           |      |        |
| 4000-531    |               |           |           |      |        |
|             |               |           |           |      |        |
| CELL \"N\"  |               |           |           |      |        |
| TO CELL     |               |           |           |      |        |
| \"E\"       |               |           |           |      |        |
| 4000-534    |               |           |           |      |        |
|             |               |           |           |      |        |
| \*QC        |               |           |           |      |        |
| COVERED     |               |           |           |      |        |
| THIS PRIOR  |               |           |           |      |        |
| TO ET 117   |               |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+
| **MSFC      |               |           |           |      |        |
| Response/Co |               |           |           |      |        |
| ncurrence** |               |           |           |      |        |
|             |               |           |           |      |        |
| 0           |               |           |           |      |        |
| 7/09/2001 - |               |           |           |      |        |
| BOARD       |               |           |           |      |        |
| ACCEPTED    |               |           |           |      |        |
| PLAN OF     |               |           |           |      |        |
| ACTION      |               |           |           |      |        |
| UNTIL       |               |           |           |      |        |
| 8/30/2001 - |               |           |           |      |        |
| PER         |               |           |           |      |        |
|             |               |           |           |      |        |
| RATIONALE   |               |           |           |      |        |
| (B): THE    |               |           |           |      |        |
| PROBLEM     |               |           |           |      |        |
| CONDITION   |               |           |           |      |        |
| IS CLEARLY  |               |           |           |      |        |
| SCREENED    |               |           |           |      |        |
| DURING      |               |           |           |      |        |
|             |               |           |           |      |        |
| PREFLIGHT   |               |           |           |      |        |
| CHECKOUT OR |               |           |           |      |        |
| SPECIAL     |               |           |           |      |        |
| TESTS.      |               |           |           |      |        |
|             |               |           |           |      |        |
| 0           |               |           |           |      |        |
| 8/30/2001 - |               |           |           |      |        |
| PROBLEM     |               |           |           |      |        |
| REOPENED    |               |           |           |      |        |
| SINCE       |               |           |           |      |        |
| DEFERRAL    |               |           |           |      |        |
| DATE        |               |           |           |      |        |
| PASSED.     |               |           |           |      |        |
|             |               |           |           |      |        |
| 1           |               |           |           |      |        |
| 1/19/2001 - |               |           |           |      |        |
| MSFC        |               |           |           |      |        |
| APPROVED    |               |           |           |      |        |
| INTERIM     |               |           |           |      |        |
| CLOSURE     |               |           |           |      |        |
| THRU        |               |           |           |      |        |
| 12/31/2001. |               |           |           |      |        |
|             |               |           |           |      |        |
| 1/02/2002 - |               |           |           |      |        |
| PROBLEM     |               |           |           |      |        |
| REOPENED    |               |           |           |      |        |
| SINCE       |               |           |           |      |        |
| DEFERRAL    |               |           |           |      |        |
| DATE        |               |           |           |      |        |
| PASSED.     |               |           |           |      |        |
|             |               |           |           |      |        |
| 1/31/2002 - |               |           |           |      |        |
| BOARD       |               |           |           |      |        |
| ACCEPTED    |               |           |           |      |        |
| PROBLEM     |               |           |           |      |        |
| CLOSURE     |               |           |           |      |        |
| RATIONALE.  |               |           |           |      |        |
| SIGNATURES  |               |           |           |      |        |
| ARE ON      |               |           |           |      |        |
|             |               |           |           |      |        |
| FILE IN THE |               |           |           |      |        |
| PAC. THIS   |               |           |           |      |        |
| PROBLEM IS  |               |           |           |      |        |
| OFFICIALLY  |               |           |           |      |        |
| CLOSED.     |               |           |           |      |        |
+-------------+---------------+-----------+-----------+------+--------+

  -----------------------------------------------------------------------
  MSFC Problem Reporting and Corrective Action (PRACA) System

  ASSESSMENT ADDENDUM REPORT
  -----------------------------------------------------------------------

  ----------------- ---------------- ------------------ ----------- ----------- ------------
  **MSFC Report#**\ **IFA#**\        **Contractor       **JSC#**\   **KSC#**\   **EICN#**\
  A17695            \--              RPT#**\            \--         \--         \--
                                     S-087                                      

  **Asmnt Part#**\  **Asmnt Part     **Asmnt                                    
  80914004000-519   Name**\          Serial/Lot#**\                             
                    LH2 TANK         1131190                                    

  **HCRIT CD**\     **FCRIT CD**\    **CAUSE CD**\      **FAIL                  
  1                 3                MW - MFG-WORK      MODE**\                 
                                                        MS - STRUCT             

  **Asmnt FMEA**\   **Asmnt FM**\    **FMEA CSE**\      **FMEA                  
  \--               \--              \--                SCSE**\                 
                                                        \--                     

  **Asmnt FMEA**\   **Asmnt FM**\    **FMEA CSE**\      **FMEA                  
  \--               \--              \--                SCSE**\                 
                                                        \--                     

  **Asmnt FMEA**\   **Asmnt FM**\    **FMEA CSE**\      **FMEA                  
  \--               \--              \--                SCSE**\                 
                                                        \--                     

  **Correlated      **Correlated     **Correlated                               
  Part#**\          Part#**\         Part#**\                                   
  \--               \--              \--                                        

  **Associated      **Associated     **Associated                               
  LRU#**\           LRU#**\          LRU#**\                                    
  \--               \--              \--                                        

  **MAJOR DESIGN                                                                
  CHANGES**                                                                     

  **APRV DATE**\    **DESCRIPTION OF                                            
  \--               CHANGES**\                                                  
                    \--                                                         

  **ASSESSMENT                                                                  
  TEXT**                                                                        
  ----------------- ---------------- ------------------ ----------- ----------- ------------