# SDR UALA2008121506893

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 14, 2008
- Submitted: December 17, 2008
- Operation: Air carrier
- Aircraft: [N121UA](https://openairdocs.org/aircraft/N121UA), registered now
- Make and model: Boeing 747422
- Aircraft serial: 29167
- Aircraft time: 40,529 hours, 4,855 cycles
- Engine: Pwa PW4056
- System (JASC): [3220 · Nose/Tail Landing Gear](https://openairdocs.org/jasc/3220)
- Part: Actuator
- Part number: 65B825854
- Condition: Activated
- Location: Nlg
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2008121506893

## Discrepancy

A 'GEAR DISAGREE' MSG WITH ASSOCIATED 'GEAR DOOR' EICAS.  DURING GEAR SWING WITH WLG & BDG PINNED. NLG UP & LOCKED NORMALLY BUT WHEN SWINGING ALL GEARS (NOT PINNED) THE NLG WILL NOT RETRACT FULLY.  SUSPECT NOSE-BODY LANDING GEAR SELECTOR VLV AT FAULT.  REPLACED NLG RETRACT ACTUATOR AND NLG LOCK.  OPS CHK NORMAL.

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