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

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

+--------------+---------------+-----------+---------+------+--------+
| **MSFC       | **In-Flight   | **C       | **      | *    |        |
| Record \#**\ | Anomaly       | ontractor | JSC#**\ | *KSC |        |
| A11016       | Number**\     | Report    | \--     | #**\ |        |
|              | \--           | Number**\ |         | \--  |        |
|              |               | E-100-2   |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Problem    |               |           |         |      |        |
| Title**\     |               |           |         |      |        |
| LO2 LEVEL    |               |           |         |      |        |
| SENSOR       |               |           |         |      |        |
| FAILED       |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
| TEST         |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **EICN#**\   | **ELEMENT**\  | **Cont    | **F     | **   |        |
| \--          | ET            | ractor**\ | SCM#**\ | FCRI |        |
|              |               | MMMSS     | \--     | T**\ |        |
|              |               |           |         | 1    |        |
+--------------+---------------+-----------+---------+------+--------+
| **HCRIT**\   | **Sys_Lvl**\  | **Misc    |         |      |        |
| 1            | Y             | Codes**\  |         |      |        |
|              |               | A B C D E |         |      |        |
|              |               | F G H I J |         |      |        |
|              |               | K L M N O |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| *            | **NO          | *         | **SER/  | *    |        |
| *HARDWARE**\ | MENCLATURE**\ | *PART#**\ | LOT#**\ | *MAN |        |
| EIM          | L02 LEVEL     | 74L4-1    | 948     | UFAC |        |
|              | SENSOR        |           |         | TURE |        |
|              |               |           |         | R**\ |        |
|              |               |           |         | SIMM |        |
|              |               |           |         | ONDS |        |
+--------------+---------------+-----------+---------+------+--------+
| *            | **NO          | *         | **SER/  | *    |        |
| *HARDWARE**\ | MENCLATURE**\ | *PART#**\ | LOT#**\ | *MAN |        |
| LRU          | L02 TANK      | 80        | N/A     | UFAC |        |
|              |               | 911000000 |         | TURE |        |
|              |               |           |         | R**\ |        |
|              |               |           |         | MMC  |        |
+--------------+---------------+-----------+---------+------+--------+
| *            | **NO          | *         | **SER/  | *    |        |
| *HARDWARE**\ | MENCLATURE**\ | *PART#**\ | LOT#**\ | *MAN |        |
| NCA          | L02 LEVEL     | 74L4-1    | 948     | 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   | 11   |        |
|              |               |           |         | /21/ |        |
|              |               |           |         | 1986 |        |
+--------------+---------------+-----------+---------+------+--------+
| **Received   | **Date        | **FMEA    | **IFA:  | *    |        |
| at MSFC**\   | Isolated**\   | Ref       | Mission | *Mis |        |
| 09/28/1987   | \--           | erence**\ | P       | sion |        |
|              |               | 3.1.2.1   | hase**\ | Ela  |        |
|              |               |           | \--     | psed |        |
|              |               |           |         | Tim  |        |
|              |               |           |         | e**\ |        |
|              |               |           |         | \--  |        |
+--------------+---------------+-----------+---------+------+--------+
| *            |               | **S       |         | **   |        |
| *Location**\ |               | ymptom**\ |         | Time |        |
| MAF          |               | EVM -     |         | Cycl |        |
|              |               | CON/MEG   |         | e**\ |        |
|              |               | FAIL      |         | \--  |        |
+--------------+---------------+-----------+---------+------+--------+
| *            |               |           |         |      |        |
| *Effectivity |               |           |         |      |        |
| Text**\      |               |           |         |      |        |
| LWTS 16, 20, |               |           |         |      |        |
| 21, 22,      |               |           |         |      |        |
| 24/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** |               |           |         |      |        |
|              |               |           |         |      |        |
| A LIQUID     |               |           |         |      |        |
| OXYGEN LEVEL |               |           |         |      |        |
| SENSOR, P/N  |               |           |         |      |        |
| 74L4-1,      |               |           |         |      |        |
| FAILED TO    |               |           |         |      |        |
| MEET THE     |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
|              |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| REQUIREMENT  |               |           |         |      |        |
| OF AN ET,    |               |           |         |      |        |
| WORK-        |               |           |         |      |        |
| IN-PROGRESS, |               |           |         |      |        |
| CONFIDENCE   |               |           |         |      |        |
| TEST         |               |           |         |      |        |
|              |               |           |         |      |        |
| PROCEDURE.   |               |           |         |      |        |
| THE MINIMUM  |               |           |         |      |        |
| ALLOWABLE    |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| AT 50 VOLTS  |               |           |         |      |        |
| DC IS 5      |               |           |         |      |        |
|              |               |           |         |      |        |
| MEGOHMS. THE |               |           |         |      |        |
| ACTUAL VALUE |               |           |         |      |        |
| OBTAINED WAS |               |           |         |      |        |
| 2.5 MEGOHMS. |               |           |         |      |        |
| REFERENCE    |               |           |         |      |        |
| MARS         |               |           |         |      |        |
|              |               |           |         |      |        |
| T-62787.     |               |           |         |      |        |
| REF: CAPS    |               |           |         |      |        |
| E-081,       |               |           |         |      |        |
| E-093, MARS  |               |           |         |      |        |
| T62787, AND  |               |           |         |      |        |
| A10102. THIS |               |           |         |      |        |
| PROBLEM      |               |           |         |      |        |
|              |               |           |         |      |        |
| WAS OPENED   |               |           |         |      |        |
| DUE TO       |               |           |         |      |        |
| MU           |               |           |         |      |        |
| LTI-FAILURES |               |           |         |      |        |
| AS REPORTED  |               |           |         |      |        |
| ON CAPS      |               |           |         |      |        |
| E-100B       |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **Contractor |               |           |         |      |        |
| In           |               |           |         |      |        |
| vestigation/ |               |           |         |      |        |
| Resolution** |               |           |         |      |        |
|              |               |           |         |      |        |
| R/C: THE     |               |           |         |      |        |
| TEST         |               |           |         |      |        |
| REQUIREMENTS |               |           |         |      |        |
| FOR THE      |               |           |         |      |        |
| SENSORS ARE  |               |           |         |      |        |
| NOT          |               |           |         |      |        |
| CONSISTENT   |               |           |         |      |        |
| AMONG THE    |               |           |         |      |        |
|              |               |           |         |      |        |
| VENDOR, MAF, |               |           |         |      |        |
| AND THE      |               |           |         |      |        |
| LAUNCH       |               |           |         |      |        |
| SITES. TEST  |               |           |         |      |        |
| REQUIREMENTS |               |           |         |      |        |
| HAVE BEEN    |               |           |         |      |        |
| REVISED      |               |           |         |      |        |
|              |               |           |         |      |        |
| TO BE        |               |           |         |      |        |
| CONSISTENT   |               |           |         |      |        |
| WITH THE     |               |           |         |      |        |
| VENDOR\'S.   |               |           |         |      |        |
| 10/6/87 -    |               |           |         |      |        |
| TASK I       |               |           |         |      |        |
| FAILURE      |               |           |         |      |        |
|              |               |           |         |      |        |
| I            |               |           |         |      |        |
| NVESTIGATION |               |           |         |      |        |
| THE RESULTS  |               |           |         |      |        |
| OF FAILURE   |               |           |         |      |        |
| ANALYSIS     |               |           |         |      |        |
| T-62787/T-62 |               |           |         |      |        |
| 792/T-92260, |               |           |         |      |        |
|              |               |           |         |      |        |
| AS PERFORMED |               |           |         |      |        |
| BY MMC, ARE  |               |           |         |      |        |
| LISTED       |               |           |         |      |        |
| BELOW. THE   |               |           |         |      |        |
| ANALYSIS     |               |           |         |      |        |
| INCLUDED THE |               |           |         |      |        |
|              |               |           |         |      |        |
| ORIGINAL     |               |           |         |      |        |
| FAILURE AS   |               |           |         |      |        |
| WELL AS      |               |           |         |      |        |
| SEVERAL      |               |           |         |      |        |
| OTHER        |               |           |         |      |        |
| SENSORS,     |               |           |         |      |        |
| FROM THE     |               |           |         |      |        |
| SAME LEVEL   |               |           |         |      |        |
|              |               |           |         |      |        |
| SENSOR MAST  |               |           |         |      |        |
| ASSEMBLY,    |               |           |         |      |        |
| WHICH HAD    |               |           |         |      |        |
| LOWER THAN   |               |           |         |      |        |
| EXPECTED     |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
|              |               |           |         |      |        |
| RE           |               |           |         |      |        |
| SISTANCE. 1. |               |           |         |      |        |
| THE CAUSE OF |               |           |         |      |        |
| THE ORIGINAL |               |           |         |      |        |
| SENSOR       |               |           |         |      |        |
| FAILURE,     |               |           |         |      |        |
| SERIAL       |               |           |         |      |        |
| NUMBER       |               |           |         |      |        |
|              |               |           |         |      |        |
| 948, WAS     |               |           |         |      |        |
| ARCING       |               |           |         |      |        |
| BETWEEN THE  |               |           |         |      |        |
| CIRCUIT PATH |               |           |         |      |        |
| ON THE       |               |           |         |      |        |
| SENSOR       |               |           |         |      |        |
| ELEMENT      |               |           |         |      |        |
|              |               |           |         |      |        |
| SUBSTRATE    |               |           |         |      |        |
| AND THE      |               |           |         |      |        |
| METAL CASE   |               |           |         |      |        |
| OF THE       |               |           |         |      |        |
| SENSOR. 2.   |               |           |         |      |        |
| THE PROBABLE |               |           |         |      |        |
| CAUSE OF     |               |           |         |      |        |
|              |               |           |         |      |        |
| THE LOW      |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| ON THE TWO   |               |           |         |      |        |
| ADDITIONAL   |               |           |         |      |        |
| SENSORS,     |               |           |         |      |        |
| SERIAL NUM-  |               |           |         |      |        |
|              |               |           |         |      |        |
| BERS 949 AND |               |           |         |      |        |
| 950, WAS A   |               |           |         |      |        |
| THIN OR      |               |           |         |      |        |
| POROUS       |               |           |         |      |        |
| TEFLON PAINT |               |           |         |      |        |
| ON THE       |               |           |         |      |        |
| TRANSDUCER   |               |           |         |      |        |
|              |               |           |         |      |        |
| CASE         |               |           |         |      |        |
| COMBINED     |               |           |         |      |        |
| WITH THE     |               |           |         |      |        |
| CIRCUIT PATH |               |           |         |      |        |
| ON THE       |               |           |         |      |        |
| SENSOR       |               |           |         |      |        |
| ELEMENT      |               |           |         |      |        |
| SUBSTRATE    |               |           |         |      |        |
|              |               |           |         |      |        |
| PRESSING     |               |           |         |      |        |
| AGAINST THE  |               |           |         |      |        |
| TEFLON       |               |           |         |      |        |
| PAINT. 3.    |               |           |         |      |        |
| THE VENDOR   |               |           |         |      |        |
| ACCEPTANCE   |               |           |         |      |        |
| TESTS DOES   |               |           |         |      |        |
|              |               |           |         |      |        |
| NOT CONTROL  |               |           |         |      |        |
| HUMIDITY     |               |           |         |      |        |
| DURING THE   |               |           |         |      |        |
| ELECTRICAL   |               |           |         |      |        |
| TEST.        |               |           |         |      |        |
| HUMIDITY     |               |           |         |      |        |
| AGGRAVATES   |               |           |         |      |        |
|              |               |           |         |      |        |
| THE PROBLEMS |               |           |         |      |        |
| ASSOCIATED   |               |           |         |      |        |
| WITH THIN OR |               |           |         |      |        |
| POROUS       |               |           |         |      |        |
| TEFLON       |               |           |         |      |        |
| PAINT. 4.    |               |           |         |      |        |
| THE VENDOR   |               |           |         |      |        |
|              |               |           |         |      |        |
| ACCEPTANCE   |               |           |         |      |        |
| TEST         |               |           |         |      |        |
| REQUIRES AN  |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| OF GREATER   |               |           |         |      |        |
| THAN 2       |               |           |         |      |        |
|              |               |           |         |      |        |
| MEGOHMS AT   |               |           |         |      |        |
| 500 VDC. THE |               |           |         |      |        |
| MAF          |               |           |         |      |        |
| REQUIREMENT  |               |           |         |      |        |
| IS 5 MEGOHMS |               |           |         |      |        |
| AT 50 VDC.   |               |           |         |      |        |
| THIS         |               |           |         |      |        |
|              |               |           |         |      |        |
| RESULTED IN  |               |           |         |      |        |
| SENSOR       |               |           |         |      |        |
| SERIAL       |               |           |         |      |        |
| NUMBER 948   |               |           |         |      |        |
| FAILING THE  |               |           |         |      |        |
| MAF          |               |           |         |      |        |
| REQUIREMENT  |               |           |         |      |        |
| WHILE        |               |           |         |      |        |
|              |               |           |         |      |        |
| STILL        |               |           |         |      |        |
| PASSING THE  |               |           |         |      |        |
| VENDOR       |               |           |         |      |        |
| R            |               |           |         |      |        |
| EQUIREMENTS. |               |           |         |      |        |
| 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 ISOLATION |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| TEST OF THE  |               |           |         |      |        |
| LH2          |               |           |         |      |        |
|              |               |           |         |      |        |
| DEPLETION    |               |           |         |      |        |
| SENSORS AND  |               |           |         |      |        |
| TO TEST ALL  |               |           |         |      |        |
| VEHICLES     |               |           |         |      |        |
| THAT HAVE    |               |           |         |      |        |
| ALREADY COM- |               |           |         |      |        |
|              |               |           |         |      |        |
| PLETED FILE  |               |           |         |      |        |
| 4 TESTING.   |               |           |         |      |        |
| CLOSURE      |               |           |         |      |        |
| STATEMENT:   |               |           |         |      |        |
| THE RCN WAS  |               |           |         |      |        |
| APPROVED AND |               |           |         |      |        |
|              |               |           |         |      |        |
| ASSIGNED     |               |           |         |      |        |
| NUMBER       |               |           |         |      |        |
| MT-7484. C.  |               |           |         |      |        |
| ELECTRICAL   |               |           |         |      |        |
| ENGINEERING  |               |           |         |      |        |
| HAS          |               |           |         |      |        |
| INITIATED    |               |           |         |      |        |
| CHANGE       |               |           |         |      |        |
|              |               |           |         |      |        |
| SUMMARY      |               |           |         |      |        |
| B01806 TO    |               |           |         |      |        |
| REVISE THE   |               |           |         |      |        |
| SENSOR       |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| REQUIREMENTS |               |           |         |      |        |
|              |               |           |         |      |        |
| AND TEST     |               |           |         |      |        |
| METHODS AT   |               |           |         |      |        |
| THE VENDOR   |               |           |         |      |        |
| AND AT MAF.  |               |           |         |      |        |
| CLOSURE      |               |           |         |      |        |
| STATEMENT:   |               |           |         |      |        |
| 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 CLOSED  |               |           |         |      |        |
| TASK IV CAPS |               |           |         |      |        |
| CLOSURE      |               |           |         |      |        |
| SUMMARY THE  |               |           |         |      |        |
| SENSOR       |               |           |         |      |        |
|              |               |           |         |      |        |
| EXPERIENCED  |               |           |         |      |        |
| ISOLATION    |               |           |         |      |        |
| RESISTANCE   |               |           |         |      |        |
| FAILURES     |               |           |         |      |        |
| WHICH        |               |           |         |      |        |
| RESULTED     |               |           |         |      |        |
| FROM BOTH    |               |           |         |      |        |
| THE          |               |           |         |      |        |
|              |               |           |         |      |        |
| SENSITIVITY  |               |           |         |      |        |
| OF THE       |               |           |         |      |        |
| SENSOR 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 TEST     |               |           |         |      |        |
| 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      |               |           |         |      |        |
| REMAINING    |               |           |         |      |        |
| 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.  |               |           |         |      |        |
| THE 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     |               |           |         |      |        |
|              |               |           |         |      |        |
| 11/20/87 -   |               |           |         |      |        |
| THE SENSOR   |               |           |         |      |        |
| DESIGN HAS   |               |           |         |      |        |
| NOT BEEN     |               |           |         |      |        |
| CHANGED TO   |               |           |         |      |        |
| PROVIDE      |               |           |         |      |        |
| POSITIVE     |               |           |         |      |        |
|              |               |           |         |      |        |
| PHYSICAL     |               |           |         |      |        |
| SEPARATION   |               |           |         |      |        |
| BETWEEN THE  |               |           |         |      |        |
| ELECTRICAL   |               |           |         |      |        |
| CIRCUIT PATH |               |           |         |      |        |
| OF THE       |               |           |         |      |        |
| SENSOR       |               |           |         |      |        |
|              |               |           |         |      |        |
| ELEMENT AND  |               |           |         |      |        |
| METAL CASE.  |               |           |         |      |        |
| THEREFORE, A |               |           |         |      |        |
| RISK REMAINS |               |           |         |      |        |
| THAT THE     |               |           |         |      |        |
| SENSOR       |               |           |         |      |        |
|              |               |           |         |      |        |
| ELEMENT MAY  |               |           |         |      |        |
| SHIFT IN THE |               |           |         |      |        |
| CASE AT SOME |               |           |         |      |        |
| TIME AFTER   |               |           |         |      |        |
| M            |               |           |         |      |        |
| ANUFACTURING |               |           |         |      |        |
| AND          |               |           |         |      |        |
|              |               |           |         |      |        |
| PRESS        |               |           |         |      |        |
| AGAINST THE  |               |           |         |      |        |
| TEFLON       |               |           |         |      |        |
| COVERED      |               |           |         |      |        |
| INTERIOR OF  |               |           |         |      |        |
| THE CASE     |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+
| **MSFC       |               |           |         |      |        |
| Response/C   |               |           |         |      |        |
| oncurrence** |               |           |         |      |        |
+--------------+---------------+-----------+---------+------+--------+

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

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

  --------------- ------------------- ----------------- ----------- ----------- ------------
  **MSFC          **IFA#**\           **Contractor      **JSC#**\   **KSC#**\   **EICN#**\
  Report#**\      \--                 RPT#**\           \--         \--         \--
  A11016                              E-100-2                                   

  **Asmnt         **Asmnt Part        **Asmnt                                   
  Part#**\        Name**\             Serial/Lot#**\                            
  74L4-1          LOX LEVEL SENSOR    948                                       

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

  **Asmnt FMEA**\ **Asmnt FM**\       **FMEA CSE**\     **FMEA                  
  3.1.2.2         2                   A                 SCSE**\                 
                                                        1                       

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