# SDR 20001012SH002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 25, 2000
- Submitted: October 12, 2000
- Operation: Air carrier
- Aircraft: N121GU
- Make and model: Boeing 737-2H6
- Registry model: [Boeing 737-2H6](https://openairdocs.org/model/boeing-737-2h6) (OpenAirDocs)
- Aircraft serial: 20583
- System (JASC): [3260 · Landing Gear Position and Warning](https://openairdocs.org/jasc/3260)
- Part: Switch
- Part number: MS250081
- Condition: Defective
- Location: Nlg
- Stage of operation: CR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/20001012SH002

## Discrepancy

SAL/TGU - FLT TA211 -  DURING CRUISE STAGE FLIGHT, THE THRUST REVERSER NR 2 ISOLATION VALVE LIGHT CAME ON.  ACFT RETURNED FOR MAINT.  UPON LANDING, THE LIGHT WENT OFF AND THRUST REVERSER WORKED NORMALLY.  AFTER  UNEVENTFUL LANDING, MAINT TECHS PERFORMED INSPECTION OF THE NR 2 ISOLATION VALVE AND AIR GROUND SENSORS.  FOUND ELECTRICAL PINS DAMAGED ON THE CONNECTOR OF THE NR 2 ISOLATION VALVE AND AIR GROUND SENSOR SWITCHES WITH DEFECTIVE OPERATION.  CONNECTOR REPAIRED PER SPM 20-11.  REMOVED AND REPLACED NOSE GEAR AIR-GROUND SENSING SWITCH PER AMM 78-34.  PERFORMED RETRACTION AND EXTENSION OF LANDING GEAR PER AMM 7-11-21 AND AMM 78-34-61.  NO DISCREPANCIES NOTED.  FLT TESTS, NORMAL.  ACFT RETURNED TO SERVICE. (X)

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