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

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

+--------------+---------------+-----------+---------+------+--------+
| **MSFC       | **In-Flight   | **C       | **      | *    |        |
| Record \#**\ | Anomaly       | ontractor | JSC#**\ | *KSC |        |
| A10102       | Number**\     | Report    | \--     | #**\ |        |
|              | \--           | Number**\ |         | \--  |        |
|              |               | E-100-1   |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Problem    |               |           |         |      |        |
| Title**\     |               |           |         |      |        |
| LH2 LEVEL    |               |           |         |      |        |
| SENSOR       |               |           |         |      |        |
| FAILED       |               |           |         |      |        |
| INSULATION   |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| TEST         |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **EICN#**\   | **ELEMENT**\  | **Cont    | **F     | **   |        |
| \--          | ET            | ractor**\ | SCM#**\ | FCRI |        |
|              |               | MMMSS     | \--     | T**\ |        |
|              |               |           |         | 1    |        |
+--------------+---------------+-----------+---------+------+--------+
| **HCRIT**\   | **Sys_Lvl**\  | **Misc    |         |      |        |
| 1            | Y             | Codes**\  |         |      |        |
|              |               | A **(4)** |         |      |        |
|              |               | B C D E F |         |      |        |
|              |               | G H I J K |         |      |        |
|              |               | L M N O   |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| *            | **NO          | *         | **SER/  | *    |        |
| *HARDWARE**\ | MENCLATURE**\ | *PART#**\ | LOT#**\ | *MAN |        |
| EIM          | LH2 LEVEL     | 74L4-2    | 1293    | UFAC |        |
|              | SENSOR        |           |         | TURE |        |
|              |               |           |         | R**\ |        |
|              |               |           |         | SIMM |        |
|              |               |           |         | ONDS |        |
+--------------+---------------+-----------+---------+------+--------+
| *            | **NO          | *         | **SER/  | *    |        |
| *HARDWARE**\ | MENCLATURE**\ | *PART#**\ | LOT#**\ | *MAN |        |
| LRU          | LH2 TANK      | 80        | N/A     | UFAC |        |
|              |               | 911000000 |         | TURE |        |
|              |               |           |         | R**\ |        |
|              |               |           |         | MMC  |        |
+--------------+---------------+-----------+---------+------+--------+
| *            | **NO          | *         | **SER/  | *    |        |
| *HARDWARE**\ | MENCLATURE**\ | *PART#**\ | LOT#**\ | *MAN |        |
| NCA          | LH2 LEVEL     | 74L4-2    | 1293    | UFAC |        |
|              | SENSOR        |           |         | TURE |        |
|              |               |           |         | R**\ |        |
|              |               |           |         | SIMM |        |
|              |               |           |         | ONDS |        |
+--------------+---------------+-----------+---------+------+--------+
| **Test/      | **Prevailing  | **F /     | **Fail  | **   |        |
| Operation**\ | Condtion**\   | U**\      | Mode**\ | Caus |        |
| A - ATP      | F -           | F         | EE -    | e**\ |        |
|              | FUNCTIONAL    |           | RANDOM  | E    |        |
|              |               |           |         | TP - |        |
|              |               |           |         | EI-T |        |
|              |               |           |         | EST- |        |
|              |               |           |         | INST |        |
+--------------+---------------+-----------+---------+------+--------+
| **System**\  | **Defect**\   | **Ma      | **Work  | **   |        |
| ELECTRICAL   | EM - ELADJ    | terial**\ | Con     | Fail |        |
|              |               | C - EEE   | tact**\ | Dat  |        |
|              |               |           | J.      | e**\ |        |
|              |               |           | ADAMS   | 05   |        |
|              |               |           |         | /20/ |        |
|              |               |           |         | 1986 |        |
+--------------+---------------+-----------+---------+------+--------+
| **Received   | **Date        | **FMEA    | **IFA:  | *    |        |
| at MSFC**\   | Isolated**\   | Ref       | Mission | *Mis |        |
| 06/23/1986   | \--           | erence**\ | P       | sion |        |
|              |               | 3.6.1.1   | hase**\ | Ela  |        |
|              |               |           | \--     | psed |        |
|              |               |           |         | Tim  |        |
|              |               |           |         | e**\ |        |
|              |               |           |         | \--  |        |
+--------------+---------------+-----------+---------+------+--------+
| *            |               | **S       |         | **   |        |
| *Location**\ |               | ymptom**\ |         | Time |        |
| SIMMONDS     |               | EVM -     |         | Cycl |        |
|              |               | CON/MEG   |         | e**\ |        |
|              |               | FAIL      |         | \--  |        |
+--------------+---------------+-----------+---------+------+--------+
| *            |               |           |         |      |        |
| *Effectivity |               |           |         |      |        |
| Text**\      |               |           |         |      |        |
| LWTS 16, 20, |               |           |         |      |        |
| 21, 22, 24   |               |           |         |      |        |
| AND SUBS     |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Vehicle    |               |           |         |      |        |
| Effectivity  |               |           |         |      |        |
| Codes**      |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Vehicle    | **Vehicle     | **Vehicle | **      | *    |        |
| 1**\         | 2**\          | 3**\      | Vehicle | *Veh |        |
| \--          | \--           | \--       | 4**\    | icle |        |
|              |               |           | \--     | 5**\ |        |
|              |               |           |         | \--  |        |
+--------------+---------------+-----------+---------+------+--------+
| **Mission    |               |           |         |      |        |
| Effectivity  |               |           |         |      |        |
| Codes**      |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Mssn 1**\  | **Mssn 2**\   | **Mssn    | **Mssn  | **   |        |
| \--          | \--           | 3**\      | 4**\    | Mssn |        |
|              |               | \--       | \--     | 5**\ |        |
|              |               |           |         | \--  |        |
+--------------+---------------+-----------+---------+------+--------+
| **Estimated  |               |           |         |      |        |
| Completion   |               |           |         |      |        |
| Dates**      |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **MSFC       | **Contractor  | **LVL 3   | *       |      |        |
| Approved     | Req Defer     | Close**\  | *Remark |      |        |
| Defer Until  | Until Date**\ | \--       | /       |      |        |
| Date**\      | \--           |           | Ac      |      |        |
| \--          |               |           | tion**\ |      |        |
|              |               |           | \--     |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **I          |               |           |         |      |        |
| nvestigation |               |           |         |      |        |
| / Resolution |               |           |         |      |        |
| Summary**    |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Last MSFC  | **CN RSLV     | **Defer   | **Add   | *    |        |
| Update**\    | SBMT**\       | Date**\   | Date**\ | *R/C |        |
| 02/10/1995   | 09/28/1987    | \--       | \--     | Code |        |
|              |               |           |         | s**\ |        |
|              |               |           |         | 4 -  |        |
|              |               |           |         | TEST |        |
|              |               |           |         | \--  |        |
|              |               |           |         | \--  |        |
+--------------+---------------+-----------+---------+------+--------+
| **Assignee** |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Design**\  | **Chief       | **S &     | **Pro   | *    |        |
| P. MULLER    | Engineer**\   | MA**\     | ject**\ | *Pro |        |
|              | J. NICHOLS    | R.        | M.      | ject |        |
|              |               | JACKSON   | PESSIN  | MG   |        |
|              |               |           |         | R**\ |        |
|              |               |           |         | \--  |        |
+--------------+---------------+-----------+---------+------+--------+
| **Approval** |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Design**\  | **Chief       | **S &     | **Pro   | *    |        |
| P. MULLER    | Engineer**\   | MA**\     | ject**\ | *Pro |        |
|              | J. NICHOLS    | R.        | M.      | ject |        |
|              |               | JACKSON   | PESSIN  | MG   |        |
|              |               |           |         | R**\ |        |
|              |               |           |         | \--  |        |
+--------------+---------------+-----------+---------+------+--------+
| **PAC        | **PAC Review  | **MSFC    | **St    | *    |        |
| Assignee**\  | Complete**\   | Closure   | atus**\ | *F/A |        |
| J.EL-IBRAHIM | JE            | Date**\   | C -     | C    |        |
|              |               | 1         | CLOSED  | ompl |        |
|              |               | 2/17/1987 |         | etio |        |
|              |               |           |         | n**\ |        |
|              |               |           |         | \--  |        |
+--------------+---------------+-----------+---------+------+--------+
| **Problem    | **SEV**\      | **Program | **      | **O  |        |
| Type**\      | \--           | Name**\   | REVL**\ | PRIN |        |
| \--          |               | \--       | \--     | C**\ |        |
|              |               |           |         | \--  |        |
+--------------+---------------+-----------+---------+------+--------+
| **FUNC       | **Software    | *         |         | **SU | **So   |
| MOD**\       | E             | *Software |         | BTYP | ftware |
| \--          | ffectivity**\ | Fail      |         | E**\ | C      |
|              | \-- \-- \--   | CD**\     |         | \--  | losure |
|              | \-- \--       | \--       |         |      | CD**\  |
|              |               |           |         |      | \--    |
+--------------+---------------+-----------+---------+------+--------+
| **RES PERSON | **Approval    |           |         |      |        |
| L2**\        | Signature     |           |         |      |        |
| \--          | L3**\         |           |         |      |        |
|              | \--           |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Related    | **Related     |           |         |      |        |
| Document     | Document      |           |         |      |        |
| Type**\      | ID**\         |           |         |      |        |
| \--          | \--           |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Related    |               |           |         |      |        |
| Document     |               |           |         |      |        |
| Title**\     |               |           |         |      |        |
| \--          |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Related    | **Related     |           |         |      |        |
| Document     | Document      |           |         |      |        |
| Type**\      | ID**\         |           |         |      |        |
| \--          | \--           |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Related    |               |           |         |      |        |
| Document     |               |           |         |      |        |
| Title**\     |               |           |         |      |        |
| \--          |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Related    | **Related     |           |         |      |        |
| Document     | Document      |           |         |      |        |
| Type**\      | ID**\         |           |         |      |        |
| \--          | \--           |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Related    |               |           |         |      |        |
| Document     |               |           |         |      |        |
| Title**\     |               |           |         |      |        |
| \--          |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Contractor |               |           |         |      |        |
| Status       |               |           |         |      |        |
| Summary**    |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Reliabi    |               |           |         |      |        |
| lity/Quality |               |           |         |      |        |
| Assurance    |               |           |         |      |        |
| Concerns,    |               |           |         |      |        |
| Recomm       |               |           |         |      |        |
| endations:** |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Problem    |               |           |         |      |        |
| D            |               |           |         |      |        |
| escription** |               |           |         |      |        |
|              |               |           |         |      |        |
| REF:         |               |           |         |      |        |
| PREVIOUS     |               |           |         |      |        |
| CAPS E-081,  |               |           |         |      |        |
| E-093, MARS  |               |           |         |      |        |
| T-53578,     |               |           |         |      |        |
| A11016. A    |               |           |         |      |        |
| LIQUID       |               |           |         |      |        |
|              |               |           |         |      |        |
| HYDROGEN     |               |           |         |      |        |
| LEVEL SENSOR |               |           |         |      |        |
| FAILED TO    |               |           |         |      |        |
| MEET THE     |               |           |         |      |        |
| INSULATION   |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
|              |               |           |         |      |        |
| REQUIREMENT  |               |           |         |      |        |
| OF THE       |               |           |         |      |        |
| VENDOR       |               |           |         |      |        |
| ACCEPTANCE   |               |           |         |      |        |
| TEST PLAN.   |               |           |         |      |        |
| THE MINIMUM  |               |           |         |      |        |
| ALLOWABLE    |               |           |         |      |        |
|              |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| AT 500 VOLTS |               |           |         |      |        |
| DC IS 2      |               |           |         |      |        |
| MEGHOMS. THE |               |           |         |      |        |
| ACTUAL VALUE |               |           |         |      |        |
| OBTAINED WAS |               |           |         |      |        |
|              |               |           |         |      |        |
| A NEAR 0     |               |           |         |      |        |
| OHMS         |               |           |         |      |        |
| INDICATION   |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Contractor |               |           |         |      |        |
| In           |               |           |         |      |        |
| vestigation/ |               |           |         |      |        |
| Resolution** |               |           |         |      |        |
|              |               |           |         |      |        |
| REMEDIAL     |               |           |         |      |        |
| ACTION - THE |               |           |         |      |        |
| TEST         |               |           |         |      |        |
| REQUIREMENTS |               |           |         |      |        |
| FOR THE      |               |           |         |      |        |
| SENSORS ARE  |               |           |         |      |        |
| NOT          |               |           |         |      |        |
|              |               |           |         |      |        |
| CONSISTENT   |               |           |         |      |        |
| AMONG THE    |               |           |         |      |        |
| VENDOR, MAF, |               |           |         |      |        |
| AND THE      |               |           |         |      |        |
| LAUNCH SITE. |               |           |         |      |        |
| TEST         |               |           |         |      |        |
|              |               |           |         |      |        |
| REQUIREMENTS |               |           |         |      |        |
| HAVE BEEN    |               |           |         |      |        |
| REVISED TO   |               |           |         |      |        |
| BE           |               |           |         |      |        |
| CONSISTENT   |               |           |         |      |        |
| WITH THE     |               |           |         |      |        |
| VENDOR\'S    |               |           |         |      |        |
|              |               |           |         |      |        |
| ALSO,THE     |               |           |         |      |        |
| REVISION TO  |               |           |         |      |        |
| INCLUDE      |               |           |         |      |        |
| CONTROLS ON  |               |           |         |      |        |
| THE RELATIVE |               |           |         |      |        |
| HUMIDITY AND |               |           |         |      |        |
| THE          |               |           |         |      |        |
|              |               |           |         |      |        |
| TEMPERATURE  |               |           |         |      |        |
| DURING THE   |               |           |         |      |        |
| TEST. LAUNCH |               |           |         |      |        |
| CONSTRAINT - |               |           |         |      |        |
| NONE. THE    |               |           |         |      |        |
| FAILURE      |               |           |         |      |        |
|              |               |           |         |      |        |
| OCCURRED     |               |           |         |      |        |
| DURING       |               |           |         |      |        |
| ACCEPTANCE   |               |           |         |      |        |
| TESTING AT   |               |           |         |      |        |
| THE VENDOR.  |               |           |         |      |        |
| ALL LEVEL    |               |           |         |      |        |
| SENSORS ARE  |               |           |         |      |        |
|              |               |           |         |      |        |
| TESTED AGAIN |               |           |         |      |        |
| WHEN         |               |           |         |      |        |
| INSTALLED IN |               |           |         |      |        |
| AN ET.       |               |           |         |      |        |
| 6/26/86      |               |           |         |      |        |
| BACKGROUND   |               |           |         |      |        |
| INFORMATION  |               |           |         |      |        |
| -            |               |           |         |      |        |
|              |               |           |         |      |        |
| LIQUID LEVEL |               |           |         |      |        |
| SENSORS      |               |           |         |      |        |
| UNDERGO A    |               |           |         |      |        |
| SERIES OF    |               |           |         |      |        |
| VENDOR LEVEL |               |           |         |      |        |
| ACCEPTANCE   |               |           |         |      |        |
| TESTS        |               |           |         |      |        |
|              |               |           |         |      |        |
| TO ASSURE    |               |           |         |      |        |
| THAT THEY    |               |           |         |      |        |
| ARE IN       |               |           |         |      |        |
| COMPLIANCE   |               |           |         |      |        |
| WITH THE     |               |           |         |      |        |
| DRAWING      |               |           |         |      |        |
| REQUIREMENTS |               |           |         |      |        |
|              |               |           |         |      |        |
| THE SEQUENCE |               |           |         |      |        |
| OF TESTS, UP |               |           |         |      |        |
| TO THE POINT |               |           |         |      |        |
| AT WHICH     |               |           |         |      |        |
| FAILURE      |               |           |         |      |        |
| OCCURRED ON  |               |           |         |      |        |
|              |               |           |         |      |        |
| THIS SENSOR, |               |           |         |      |        |
| ARE AS       |               |           |         |      |        |
| FOLLOWS: 1.  |               |           |         |      |        |
| VERIFICATION |               |           |         |      |        |
| OF THE       |               |           |         |      |        |
| PHYSICAL     |               |           |         |      |        |
| DIMENSIONS   |               |           |         |      |        |
|              |               |           |         |      |        |
| OF THE       |               |           |         |      |        |
| SENSOR. 2.   |               |           |         |      |        |
| VISUAL       |               |           |         |      |        |
| EXAMINATION  |               |           |         |      |        |
| OF THE       |               |           |         |      |        |
| SURFACE      |               |           |         |      |        |
| FINISH OF    |               |           |         |      |        |
| THE CASE     |               |           |         |      |        |
|              |               |           |         |      |        |
| AND THE      |               |           |         |      |        |
| CONDITION OF |               |           |         |      |        |
| THE WIRES.   |               |           |         |      |        |
| 3. WEIGHT OF |               |           |         |      |        |
| THE SENSOR.  |               |           |         |      |        |
| 4.           |               |           |         |      |        |
| DIELECTRIC   |               |           |         |      |        |
|              |               |           |         |      |        |
| STRENGTH     |               |           |         |      |        |
| TEST OF 500  |               |           |         |      |        |
| VOLTS AC FOR |               |           |         |      |        |
| 1 MINUTE. 5. |               |           |         |      |        |
| INSULATION   |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
|              |               |           |         |      |        |
| GREATER THAN |               |           |         |      |        |
| 2 MEGOHMS AT |               |           |         |      |        |
| 500 VOLTS    |               |           |         |      |        |
| DC, AT WHICH |               |           |         |      |        |
| POINT THE    |               |           |         |      |        |
| SENSOR       |               |           |         |      |        |
|              |               |           |         |      |        |
| FAILED AND   |               |           |         |      |        |
| TESTING WAS  |               |           |         |      |        |
| HALTED.      |               |           |         |      |        |
| LATER TESTS  |               |           |         |      |        |
| IN THE       |               |           |         |      |        |
| SERIES       |               |           |         |      |        |
| INCLUDE      |               |           |         |      |        |
|              |               |           |         |      |        |
| THERMAL      |               |           |         |      |        |
| SHOCK,       |               |           |         |      |        |
| RESPONSE     |               |           |         |      |        |
| RATE,        |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| OF THE       |               |           |         |      |        |
| ELEMENT,     |               |           |         |      |        |
| ETC. FAILURE |               |           |         |      |        |
|              |               |           |         |      |        |
| INV          |               |           |         |      |        |
| ESTIGATION - |               |           |         |      |        |
| THE VENDOR,  |               |           |         |      |        |
| SIMMONDS     |               |           |         |      |        |
| PRECISION,   |               |           |         |      |        |
| WILL PERFORM |               |           |         |      |        |
| THE          |               |           |         |      |        |
|              |               |           |         |      |        |
| INITIAL      |               |           |         |      |        |
| STEPS OF THE |               |           |         |      |        |
| FAILURE      |               |           |         |      |        |
| ANALYSIS AT  |               |           |         |      |        |
| THEIR        |               |           |         |      |        |
| FACILITY.    |               |           |         |      |        |
| THE F/A PLAN |               |           |         |      |        |
|              |               |           |         |      |        |
| HAS BEEN     |               |           |         |      |        |
| COORDINATED  |               |           |         |      |        |
| WITH MMC     |               |           |         |      |        |
| RELIABILITY  |               |           |         |      |        |
| ASSURANCE    |               |           |         |      |        |
| AND WILL BE  |               |           |         |      |        |
|              |               |           |         |      |        |
| WITNESSED BY |               |           |         |      |        |
| THE MMC      |               |           |         |      |        |
| PROCUREMENT  |               |           |         |      |        |
| QUALITY      |               |           |         |      |        |
| REP          |               |           |         |      |        |
| RESENTATIVE. |               |           |         |      |        |
| 7/15/86 PRB  |               |           |         |      |        |
|              |               |           |         |      |        |
| STATUS - FA  |               |           |         |      |        |
| PARTIALLY    |               |           |         |      |        |
| COMPLETE.    |               |           |         |      |        |
| EXPECT       |               |           |         |      |        |
| COMPLETION   |               |           |         |      |        |
| WITHIN 40    |               |           |         |      |        |
| DAYS. MR     |               |           |         |      |        |
|              |               |           |         |      |        |
| G. P.        |               |           |         |      |        |
| BRIDWELL     |               |           |         |      |        |
| REQUESTED    |               |           |         |      |        |
| THE PROBLEM  |               |           |         |      |        |
| REPORTS      |               |           |         |      |        |
| SHOULD       |               |           |         |      |        |
| INDICATE     |               |           |         |      |        |
| THAT THIS    |               |           |         |      |        |
|              |               |           |         |      |        |
| SENSOR IS    |               |           |         |      |        |
| INT          |               |           |         |      |        |
| ERCHANGEABLE |               |           |         |      |        |
| WITH THE     |               |           |         |      |        |
| DEPLETION    |               |           |         |      |        |
| SENSOR AND   |               |           |         |      |        |
| THE          |               |           |         |      |        |
| DEPLETION    |               |           |         |      |        |
|              |               |           |         |      |        |
| SENSOR HAS A |               |           |         |      |        |
| CRITICALITY  |               |           |         |      |        |
| 1 FUNCTION.  |               |           |         |      |        |
| MMC          |               |           |         |      |        |
| CONCURRED.   |               |           |         |      |        |
| 8/21/86 PRB  |               |           |         |      |        |
| STATUS       |               |           |         |      |        |
|              |               |           |         |      |        |
| \- TWO       |               |           |         |      |        |
| ADDITIONAL   |               |           |         |      |        |
| NOISE        |               |           |         |      |        |
| FAILURES ON  |               |           |         |      |        |
| -039.        |               |           |         |      |        |
| FAILURE      |               |           |         |      |        |
| ANALYSIS TO  |               |           |         |      |        |
| BE           |               |           |         |      |        |
|              |               |           |         |      |        |
| CONDUCTED ON |               |           |         |      |        |
| THE          |               |           |         |      |        |
| ADDITIONAL   |               |           |         |      |        |
| FAILURES.    |               |           |         |      |        |
| 9/18/86 PRB  |               |           |         |      |        |
| STATUS - FA  |               |           |         |      |        |
|              |               |           |         |      |        |
| CONTINUING   |               |           |         |      |        |
| AT VENDOR.   |               |           |         |      |        |
| FAILURE IS   |               |           |         |      |        |
| AN ARC-OVER. |               |           |         |      |        |
| PIN HOLES IN |               |           |         |      |        |
| COVER PAINT  |               |           |         |      |        |
|              |               |           |         |      |        |
| IS WHERE     |               |           |         |      |        |
| ARC-OVERS    |               |           |         |      |        |
| OCCUR. COVER |               |           |         |      |        |
| TO GE FOR    |               |           |         |      |        |
| FA. FAILURE  |               |           |         |      |        |
| CONSIDERED   |               |           |         |      |        |
| NORMAL       |               |           |         |      |        |
|              |               |           |         |      |        |
| PRODUCTION   |               |           |         |      |        |
| FALLOUT.     |               |           |         |      |        |
| TEST IS AT   |               |           |         |      |        |
| 500V. ACTUAL |               |           |         |      |        |
| USAGE IS     |               |           |         |      |        |
| A            |               |           |         |      |        |
| PPROXIMATELY |               |           |         |      |        |
| 20V          |               |           |         |      |        |
|              |               |           |         |      |        |
| NO           |               |           |         |      |        |
| CORRECTIVE   |               |           |         |      |        |
| ACTION       |               |           |         |      |        |
| PLANNED. ECD |               |           |         |      |        |
| IS MID       |               |           |         |      |        |
| OCTOBER 86.  |               |           |         |      |        |
| 10/16/86 PRB |               |           |         |      |        |
|              |               |           |         |      |        |
| STATUS - NO  |               |           |         |      |        |
| CHANGE. ECD  |               |           |         |      |        |
| FOR          |               |           |         |      |        |
| COMPLETION   |               |           |         |      |        |
| AT MMC IS    |               |           |         |      |        |
| 12-5-86.     |               |           |         |      |        |
| 2/19/87 PRB  |               |           |         |      |        |
|              |               |           |         |      |        |
| STATUS -     |               |           |         |      |        |
| ELECTRICAL   |               |           |         |      |        |
| ENGINEERING  |               |           |         |      |        |
| WILL         |               |           |         |      |        |
| GENERATE A   |               |           |         |      |        |
| PRCN TO      |               |           |         |      |        |
| REVISE OMRSD |               |           |         |      |        |
|              |               |           |         |      |        |
| FILE 4 TO    |               |           |         |      |        |
| INCLUDE AN   |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| CHECK OF THE |               |           |         |      |        |
| LH2 ECO      |               |           |         |      |        |
| SENSORS      |               |           |         |      |        |
|              |               |           |         |      |        |
| AND TO TEST  |               |           |         |      |        |
| ALL VEHICLES |               |           |         |      |        |
| THAT HAVE    |               |           |         |      |        |
| ALREADY      |               |           |         |      |        |
| COMPLETED    |               |           |         |      |        |
| FILE 4       |               |           |         |      |        |
| TESTING      |               |           |         |      |        |
|              |               |           |         |      |        |
| ENGINEERING  |               |           |         |      |        |
| IS ALSO      |               |           |         |      |        |
| EVALUATING   |               |           |         |      |        |
| THE EFFECT   |               |           |         |      |        |
| OF THE       |               |           |         |      |        |
| ADDITIONAL   |               |           |         |      |        |
| SENSOR       |               |           |         |      |        |
|              |               |           |         |      |        |
| FAILURE UPON |               |           |         |      |        |
| THE          |               |           |         |      |        |
| A            |               |           |         |      |        |
| CCEPTABILITY |               |           |         |      |        |
| OF THE       |               |           |         |      |        |
| SENSORS IN   |               |           |         |      |        |
| COMPLETED    |               |           |         |      |        |
| ETS. 4/31/87 |               |           |         |      |        |
|              |               |           |         |      |        |
| \-           |               |           |         |      |        |
| ADDITIONAL   |               |           |         |      |        |
| CORRECTIVE   |               |           |         |      |        |
| ACTIONS      |               |           |         |      |        |
| REQUIRED.    |               |           |         |      |        |
| ECD 6/19/87  |               |           |         |      |        |
| 5/28/87 -    |               |           |         |      |        |
| UPDATE       |               |           |         |      |        |
|              |               |           |         |      |        |
| STATUS - NO  |               |           |         |      |        |
| CHANGE       |               |           |         |      |        |
| 9/29/87      |               |           |         |      |        |
| CLOSURE      |               |           |         |      |        |
| UPDATE - REF |               |           |         |      |        |
| MMC CAPS     |               |           |         |      |        |
| E-100B       |               |           |         |      |        |
| GENERAL      |               |           |         |      |        |
|              |               |           |         |      |        |
| A.           |               |           |         |      |        |
| BACKGROUND   |               |           |         |      |        |
| INFORMATION  |               |           |         |      |        |
| THE          |               |           |         |      |        |
| CRYOGENIC,   |               |           |         |      |        |
| POINT,       |               |           |         |      |        |
| LIQUID LEVEL |               |           |         |      |        |
| SENSORS,     |               |           |         |      |        |
|              |               |           |         |      |        |
| PART NUMBERS |               |           |         |      |        |
| 74L4-1 AND   |               |           |         |      |        |
| -2, LOX AND  |               |           |         |      |        |
| LH2 SENSORS  |               |           |         |      |        |
| R            |               |           |         |      |        |
| ESPECTIVELY, |               |           |         |      |        |
| ARE          |               |           |         |      |        |
|              |               |           |         |      |        |
| VIRTUALLY    |               |           |         |      |        |
| IDENTICAL IN |               |           |         |      |        |
| C            |               |           |         |      |        |
| ONSTRUCTION. |               |           |         |      |        |
| THE SOLE     |               |           |         |      |        |
| DIFFERENCE   |               |           |         |      |        |
| BETWEEN THE  |               |           |         |      |        |
|              |               |           |         |      |        |
| SENSORS LIES |               |           |         |      |        |
| IN THE TYPE  |               |           |         |      |        |
| OF TEFLON    |               |           |         |      |        |
| INSULATION   |               |           |         |      |        |
| ON THE       |               |           |         |      |        |
| OUTPUT       |               |           |         |      |        |
| WIRES. THE   |               |           |         |      |        |
|              |               |           |         |      |        |
| SENSORS ARE  |               |           |         |      |        |
| USED TO      |               |           |         |      |        |
| INDICATE THE |               |           |         |      |        |
| PROPELLANT   |               |           |         |      |        |
| LEVELS IN    |               |           |         |      |        |
| THE ET AND,  |               |           |         |      |        |
| IN           |               |           |         |      |        |
|              |               |           |         |      |        |
| THE CASE OF  |               |           |         |      |        |
| THE LH2      |               |           |         |      |        |
| SENSORS,     |               |           |         |      |        |
| FOUR ARE     |               |           |         |      |        |
| USED AS      |               |           |         |      |        |
| PROPELLANT   |               |           |         |      |        |
| DEPLETION    |               |           |         |      |        |
|              |               |           |         |      |        |
| SENSORS TO   |               |           |         |      |        |
| SHUTDOWN THE |               |           |         |      |        |
| ORBITER MAIN |               |           |         |      |        |
| ENGINES.     |               |           |         |      |        |
| VENDOR LEVEL |               |           |         |      |        |
| ACCEPTANCE   |               |           |         |      |        |
|              |               |           |         |      |        |
| TESTING      |               |           |         |      |        |
| VERIFIES     |               |           |         |      |        |
| PHYSICAL     |               |           |         |      |        |
| DIMENSIONS,  |               |           |         |      |        |
| RESPONSE     |               |           |         |      |        |
| RATE,        |               |           |         |      |        |
| ELEMENT      |               |           |         |      |        |
|              |               |           |         |      |        |
| RESISTANCE,  |               |           |         |      |        |
| AND          |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| OF EACH      |               |           |         |      |        |
| SENSOR.      |               |           |         |      |        |
| TESTS AT MAF |               |           |         |      |        |
| AND          |               |           |         |      |        |
|              |               |           |         |      |        |
| THE LAUNCH   |               |           |         |      |        |
| SITES CHECK  |               |           |         |      |        |
| ELEMENT      |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| AND          |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
|              |               |           |         |      |        |
| TASK I - THE |               |           |         |      |        |
| RESULTS OF   |               |           |         |      |        |
| FAILURE      |               |           |         |      |        |
| ANALYSIS     |               |           |         |      |        |
| T-53578      |               |           |         |      |        |
| PERFORMED BY |               |           |         |      |        |
| SIMMONDS     |               |           |         |      |        |
|              |               |           |         |      |        |
| PRECISION    |               |           |         |      |        |
| ARE AS       |               |           |         |      |        |
| FOLLOWS: 1.  |               |           |         |      |        |
| THE CAUSE OF |               |           |         |      |        |
| THE SENSOR   |               |           |         |      |        |
| FAILURE WAS  |               |           |         |      |        |
| ARCING       |               |           |         |      |        |
|              |               |           |         |      |        |
| BETWEEN THE  |               |           |         |      |        |
| CIRCUIT PATH |               |           |         |      |        |
| ON THE       |               |           |         |      |        |
| SENSOR       |               |           |         |      |        |
| ELEMENT      |               |           |         |      |        |
| SUBSTRATE    |               |           |         |      |        |
| AND THE      |               |           |         |      |        |
| METAL        |               |           |         |      |        |
|              |               |           |         |      |        |
| CASE OF THE  |               |           |         |      |        |
| SENSOR. 2.   |               |           |         |      |        |
| THE SENSOR   |               |           |         |      |        |
| DESIGN IS    |               |           |         |      |        |
| SUCH THAT    |               |           |         |      |        |
| THE CIRCUIT  |               |           |         |      |        |
| PATH         |               |           |         |      |        |
|              |               |           |         |      |        |
| ON THE       |               |           |         |      |        |
| SUBSTRATE    |               |           |         |      |        |
| CAN CONTACT  |               |           |         |      |        |
| THE METAL    |               |           |         |      |        |
| CASE FROM    |               |           |         |      |        |
| WHICH IT IS  |               |           |         |      |        |
| SUPPOSED     |               |           |         |      |        |
|              |               |           |         |      |        |
| TO BE        |               |           |         |      |        |
| INSULATED.   |               |           |         |      |        |
| THE SOLE     |               |           |         |      |        |
| INSULATION   |               |           |         |      |        |
| AT THAT      |               |           |         |      |        |
| POINT IS THE |               |           |         |      |        |
| SPRAYED ON,  |               |           |         |      |        |
|              |               |           |         |      |        |
| BAKED,       |               |           |         |      |        |
| TEFLON PAINT |               |           |         |      |        |
| ON THE       |               |           |         |      |        |
| INTERNAL     |               |           |         |      |        |
| SURFACES OF  |               |           |         |      |        |
| THE CASE. 3. |               |           |         |      |        |
| THE TEFLON   |               |           |         |      |        |
|              |               |           |         |      |        |
| PAINT ON THE |               |           |         |      |        |
| CASE MET THE |               |           |         |      |        |
| DESIGN       |               |           |         |      |        |
| REQUIREMENTS |               |           |         |      |        |
| FOR          |               |           |         |      |        |
| THICKNESS.   |               |           |         |      |        |
| TASK II      |               |           |         |      |        |
|              |               |           |         |      |        |
| CORRECTIVE   |               |           |         |      |        |
| ACTION A.    |               |           |         |      |        |
| THE VENDOR   |               |           |         |      |        |
| DEVELOPED AN |               |           |         |      |        |
| ASSEMBLY AID |               |           |         |      |        |
| TO MORE      |               |           |         |      |        |
|              |               |           |         |      |        |
| ACCURATELY   |               |           |         |      |        |
| CENTER THE   |               |           |         |      |        |
| SUBSTRATE IN |               |           |         |      |        |
| THE CASE.    |               |           |         |      |        |
| THIS SHOULD  |               |           |         |      |        |
| REDUCE THE   |               |           |         |      |        |
|              |               |           |         |      |        |
| OCCURRENCES  |               |           |         |      |        |
| OF THE       |               |           |         |      |        |
| CIRCUIT PATH |               |           |         |      |        |
| TOUCHING THE |               |           |         |      |        |
| INTERNAL     |               |           |         |      |        |
| SURFACE OF   |               |           |         |      |        |
| THE          |               |           |         |      |        |
|              |               |           |         |      |        |
| CASE         |               |           |         |      |        |
| (REFERENCE   |               |           |         |      |        |
| MARS         |               |           |         |      |        |
| T-53578).    |               |           |         |      |        |
| HOWEVER, THE |               |           |         |      |        |
| DESIGN OF    |               |           |         |      |        |
| THE SENSOR   |               |           |         |      |        |
|              |               |           |         |      |        |
| PROVIDES NO  |               |           |         |      |        |
| POSITIVE     |               |           |         |      |        |
| MECHANICAL   |               |           |         |      |        |
| SEPARATION   |               |           |         |      |        |
| AND THE      |               |           |         |      |        |
| PARTS COULD  |               |           |         |      |        |
| SHIFT        |               |           |         |      |        |
|              |               |           |         |      |        |
| INTO CONTACT |               |           |         |      |        |
| AT A LATER   |               |           |         |      |        |
| TIME. B.     |               |           |         |      |        |
| ELECTRICAL   |               |           |         |      |        |
| ENGINEERING  |               |           |         |      |        |
| HAS          |               |           |         |      |        |
| SUBMITTED    |               |           |         |      |        |
|              |               |           |         |      |        |
| PRCN-MMC-XL  |               |           |         |      |        |
| TO REVISE    |               |           |         |      |        |
| OMRSD FILE 4 |               |           |         |      |        |
| TO INCLUDE   |               |           |         |      |        |
| AN ISO-      |               |           |         |      |        |
| LATION       |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
|              |               |           |         |      |        |
| TEST OF THE  |               |           |         |      |        |
| LH2          |               |           |         |      |        |
| DEPLETION    |               |           |         |      |        |
| SENSORS AND  |               |           |         |      |        |
| TO TEST ALL  |               |           |         |      |        |
| VEHICLES     |               |           |         |      |        |
| THAT HAVE    |               |           |         |      |        |
|              |               |           |         |      |        |
| ALREADY      |               |           |         |      |        |
| COMPLETED    |               |           |         |      |        |
| FILE 4       |               |           |         |      |        |
| TESTING. THE |               |           |         |      |        |
| RCN HAS BEEN |               |           |         |      |        |
| APPROVED AND |               |           |         |      |        |
|              |               |           |         |      |        |
| ASSIGNED     |               |           |         |      |        |
| NUMBER       |               |           |         |      |        |
| MT-7484.     |               |           |         |      |        |
| CHANGE       |               |           |         |      |        |
| SUMMARY      |               |           |         |      |        |
| B01806 WAS   |               |           |         |      |        |
| APPROVED ON  |               |           |         |      |        |
|              |               |           |         |      |        |
| SEPTEMBER    |               |           |         |      |        |
| 16, 1987.    |               |           |         |      |        |
| THE VENDOR   |               |           |         |      |        |
| ATP          |               |           |         |      |        |
| REQUIREMENTS |               |           |         |      |        |
| WERE REVISED |               |           |         |      |        |
| TO INCLUDE   |               |           |         |      |        |
|              |               |           |         |      |        |
| HUMIDITY AND |               |           |         |      |        |
| TEMPERATURE  |               |           |         |      |        |
| CONTROLS     |               |           |         |      |        |
| DURING THE   |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
|              |               |           |         |      |        |
| TESTS. THE   |               |           |         |      |        |
| MAF FLIGHT   |               |           |         |      |        |
| ACCEPTANCE   |               |           |         |      |        |
| R            |               |           |         |      |        |
| EQUIREMENTS, |               |           |         |      |        |
| MMC          |               |           |         |      |        |
| -ET-TM04K-B, |               |           |         |      |        |
| WERE         |               |           |         |      |        |
|              |               |           |         |      |        |
| REVISED TO   |               |           |         |      |        |
| REQUIRE THE  |               |           |         |      |        |
| SAME         |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| VALUE AS     |               |           |         |      |        |
| USED DURING  |               |           |         |      |        |
|              |               |           |         |      |        |
| THE VENDOR   |               |           |         |      |        |
| ATP. TASK    |               |           |         |      |        |
| III          |               |           |         |      |        |
| CLEARANCE OF |               |           |         |      |        |
| E            |               |           |         |      |        |
| FFECTIVITIES |               |           |         |      |        |
| THERE ARE NO |               |           |         |      |        |
|              |               |           |         |      |        |
| CONSTRAINTS. |               |           |         |      |        |
| ALL ETS ARE  |               |           |         |      |        |
| TO BE        |               |           |         |      |        |
| RETESTED FOR |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| OF THE       |               |           |         |      |        |
|              |               |           |         |      |        |
| LH2          |               |           |         |      |        |
| DEPLETION    |               |           |         |      |        |
| CIRCUITS,    |               |           |         |      |        |
| PER RCN      |               |           |         |      |        |
| MT-7484.     |               |           |         |      |        |
| TASK IV CAPS |               |           |         |      |        |
| CLOSURE      |               |           |         |      |        |
| SUMMARY      |               |           |         |      |        |
|              |               |           |         |      |        |
| THE SENSORS  |               |           |         |      |        |
| EXPERIENCED  |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| FAILURES     |               |           |         |      |        |
| WHICH        |               |           |         |      |        |
| RESULTED     |               |           |         |      |        |
|              |               |           |         |      |        |
| FROM BOTH    |               |           |         |      |        |
| THE          |               |           |         |      |        |
| SENSITIVITY  |               |           |         |      |        |
| OF THE       |               |           |         |      |        |
| SENSORS TO   |               |           |         |      |        |
| HIGH         |               |           |         |      |        |
| HUMIDITY AND |               |           |         |      |        |
| THE          |               |           |         |      |        |
|              |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| REQUIREMENTS |               |           |         |      |        |
| BEING MORE   |               |           |         |      |        |
| STRINGENT AT |               |           |         |      |        |
| MAF THAN AT  |               |           |         |      |        |
|              |               |           |         |      |        |
| THE VENDOR.  |               |           |         |      |        |
| H            |               |           |         |      |        |
| ISTORICALLY, |               |           |         |      |        |
| THERE HAVE   |               |           |         |      |        |
| BEEN NO      |               |           |         |      |        |
| LEVEL        |               |           |         |      |        |
| MEASUREMENT  |               |           |         |      |        |
| CIRCUIT      |               |           |         |      |        |
|              |               |           |         |      |        |
| FAILURES AT  |               |           |         |      |        |
| KSC WHICH    |               |           |         |      |        |
| WERE         |               |           |         |      |        |
| ATTRIBUTED   |               |           |         |      |        |
| TO LOW       |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| ON           |               |           |         |      |        |
|              |               |           |         |      |        |
| ANY OF THE   |               |           |         |      |        |
| A            |               |           |         |      |        |
| PPROXIMATELY |               |           |         |      |        |
| 20 SENSORS   |               |           |         |      |        |
| ON EACH      |               |           |         |      |        |
| ET.THE       |               |           |         |      |        |
| SENSOR       |               |           |         |      |        |
| DESIGN IS    |               |           |         |      |        |
|              |               |           |         |      |        |
| CONSIDERED   |               |           |         |      |        |
| TO BE        |               |           |         |      |        |
| ADEQUATE.    |               |           |         |      |        |
| THE          |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| REQUIREMENTS |               |           |         |      |        |
| WERE         |               |           |         |      |        |
|              |               |           |         |      |        |
| REVISED AT   |               |           |         |      |        |
| THE VENDOR,  |               |           |         |      |        |
| MAF, AND THE |               |           |         |      |        |
| LAUNCH SITE. |               |           |         |      |        |
| THE CHANGES  |               |           |         |      |        |
| WILL         |               |           |         |      |        |
|              |               |           |         |      |        |
| INCREASE THE |               |           |         |      |        |
| LIKELIHOOD   |               |           |         |      |        |
| OF DETECTING |               |           |         |      |        |
| SENSOR       |               |           |         |      |        |
| FAILURES     |               |           |         |      |        |
| DURING       |               |           |         |      |        |
| VENDOR       |               |           |         |      |        |
|              |               |           |         |      |        |
| ACCEPTANCE   |               |           |         |      |        |
| TESTING,     |               |           |         |      |        |
| RATHER THAN  |               |           |         |      |        |
| AFTER        |               |           |         |      |        |
| INSTALLATION |               |           |         |      |        |
| ON AN ET.    |               |           |         |      |        |
| THE          |               |           |         |      |        |
|              |               |           |         |      |        |
| REQUIREMENTS |               |           |         |      |        |
| AT THE       |               |           |         |      |        |
| LAUNCH SITE  |               |           |         |      |        |
| FOR THE      |               |           |         |      |        |
| SENSORS IN   |               |           |         |      |        |
| THE LH2      |               |           |         |      |        |
| DEPLETION    |               |           |         |      |        |
|              |               |           |         |      |        |
| CIRCUITS     |               |           |         |      |        |
| WERE REVISED |               |           |         |      |        |
| TO INCLUDE   |               |           |         |      |        |
| AN ISOLATION |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| TEST TO THE  |               |           |         |      |        |
|              |               |           |         |      |        |
| SAME VALUE   |               |           |         |      |        |
| AS A NEW     |               |           |         |      |        |
| SENSOR. LOW  |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| WILL CAUSE   |               |           |         |      |        |
| AN           |               |           |         |      |        |
|              |               |           |         |      |        |
| ORBITER      |               |           |         |      |        |
| LEVEL SENSOR |               |           |         |      |        |
| SIGNAL       |               |           |         |      |        |
| CONDITIONER  |               |           |         |      |        |
| TO GIVE A    |               |           |         |      |        |
| FALSE        |               |           |         |      |        |
| \"WET\"      |               |           |         |      |        |
|              |               |           |         |      |        |
| INDICATION.  |               |           |         |      |        |
| SINCE THIS   |               |           |         |      |        |
| FAILURE MODE |               |           |         |      |        |
| IS CRITICAL  |               |           |         |      |        |
| ONLY FOR THE |               |           |         |      |        |
| LH2          |               |           |         |      |        |
|              |               |           |         |      |        |
| DEPLETION    |               |           |         |      |        |
| CIRCUITS,    |               |           |         |      |        |
| ADDITIONAL   |               |           |         |      |        |
| TESTS FOR    |               |           |         |      |        |
| THE REMAIN-  |               |           |         |      |        |
| ING SENSORS  |               |           |         |      |        |
| WERE         |               |           |         |      |        |
|              |               |           |         |      |        |
| NOT ADDED TO |               |           |         |      |        |
| THE TESTING  |               |           |         |      |        |
| AT THE       |               |           |         |      |        |
| LAUNCH SITE. |               |           |         |      |        |
| THE VENDOR   |               |           |         |      |        |
| ACCEPTANCE   |               |           |         |      |        |
| TEST         |               |           |         |      |        |
|              |               |           |         |      |        |
| REQUIREMENTS |               |           |         |      |        |
| ARE NOW      |               |           |         |      |        |
| SUFFICIENTLY |               |           |         |      |        |
| STRINGENT TO |               |           |         |      |        |
| DETECT THE   |               |           |         |      |        |
| MAJORITY OF  |               |           |         |      |        |
|              |               |           |         |      |        |
| ALL SENSORS  |               |           |         |      |        |
| WHICH HAVE   |               |           |         |      |        |
| LOW          |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
| RESISTANCE.  |               |           |         |      |        |
| A LIMITED    |               |           |         |      |        |
| NUMBER OF    |               |           |         |      |        |
|              |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| TEST         |               |           |         |      |        |
| FAILURES CAN |               |           |         |      |        |
| BE EXPECTED  |               |           |         |      |        |
| TO OCCUR     |               |           |         |      |        |
| DURING       |               |           |         |      |        |
|              |               |           |         |      |        |
| VENDOR       |               |           |         |      |        |
| TESTING AS A |               |           |         |      |        |
| NATURAL      |               |           |         |      |        |
| RESULT OF    |               |           |         |      |        |
| THE SENSOR   |               |           |         |      |        |
| DESIGN. THIS |               |           |         |      |        |
| PROBLEM      |               |           |         |      |        |
|              |               |           |         |      |        |
| IS SUBMITTED |               |           |         |      |        |
| TO MSFC FOR  |               |           |         |      |        |
| CLOSURE      |               |           |         |      |        |
| REVIEW AND   |               |           |         |      |        |
| APPROVAL     |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **MSFC       |               |           |         |      |        |
| Response/C   |               |           |         |      |        |
| oncurrence** |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+

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

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

  --------------- ------------------- ------------------ ----------- ----------- ------------
  **MSFC          **IFA#**\           **Contractor       **JSC#**\   **KSC#**\   **EICN#**\
  Report#**\      \--                 RPT#**\            \--         \--         \--
  A10102                              E-100-1                                    

  **Asmnt         **Asmnt Part        **Asmnt                                    
  Part#**\        Name**\             Serial/Lot#**\                             
  74L4-2          LH2 LEVEL SENSOR    1293                                       

  **HCRIT CD**\   **FCRIT CD**\       **CAUSE CD**\      **FAIL                  
  \--             1R                  ETP - EI-TEST-INST MODE**\                 
                                                         EM - ELECT              
                                                         LEAK                    

  **Asmnt FMEA**\ **Asmnt FM**\       **FMEA CSE**\      **FMEA                  
  3.6.1.1         1                   A                  SCSE**\                 
                                                         N/A                     

  **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**                                                                         
  --------------- ------------------- ------------------ ----------- ----------- ------------