# SDR UALA2011090204724

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 2, 2011
- Submitted: September 29, 2011
- Operation: Air carrier
- Aircraft: [N508UA](https://openairdocs.org/aircraft/N508UA), registered now
- Make and model: Boeing 757222
- Aircraft serial: 24744
- Aircraft time: 73,047 hours, 22,624 cycles
- Engine: Pwa PW2037
- System (JASC): [3231 · Landing Gear Door Retract Section](https://openairdocs.org/jasc/3231)
- Part: Sequence Valve
- Part number: 60B002477
- Part serial: 2768
- Condition: Faulty
- Location: Nlg
- Stage of operation: LD
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2011090204724

## Discrepancy

USED ALT GEAR TO EXTEND ON LANDING AFTER NO NOSE GEAR GREEN LIGHT.  AS PER FAULT ISOLATION PROCEDURE 32-30-00 FIG 104, FOUND THE DOOR OPERATED SEQUENCE VALVE AT FAULT.  REPLACED NOSE GEAR DOOR OPERATED SEQUENCE VALVE.

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