# SDR SWAA092638

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 26, 2009
- Submitted: April 28, 2009
- Operation: Air carrier
- Aircraft: [N470WN](https://openairdocs.org/aircraft/N470WN), registered now
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 33860
- Aircraft time: 18,351 hours, 10,612 cycles
- System (JASC): [3260 · Landing Gear Position and Warning](https://openairdocs.org/jasc/3260)
- Part: Sensor
- Part number: AD450017
- Condition: Damaged
- Location: Nlg
- Stage of operation: CL
- 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/SWAA092638

## Discrepancy

AIR TURNBACK, WITH GEAR HANDLE IN OFF POSITION, NLG FELL TO DOWN POSITION WITH UNSAFE LIGHT INDICATION.  FOUND NLG S854 SENSOR DAMAGED AND OBSTRUCTING UPLOCK ASSY.  REMOVED AND REPLACED S854 UPLOCK SENSOR PER MM.

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