# SDR UALA2010051701656

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 15, 2010
- Submitted: May 17, 2010
- Operation: Air carrier
- Aircraft: [N120UA](https://openairdocs.org/aircraft/N120UA), registered now
- Make and model: Boeing 747422
- Aircraft serial: 29166
- Aircraft time: 45,349 hours, 5,413 cycles
- Engine: Pwa PW4056
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Apu
- Part number: S351U0022
- Part serial: 900556PWC
- Condition: Faulty
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2010051701656

## Discrepancy

APU WOULDN'T START.  2 ATTEMPTS.  SPOOLED UP TO 14PCT THEN SHUTDOWN.  SPOOLED UPTO 14PCT THEN SHUTDOWN.  APU NO LIGHT OFF.  DUE TO CHRONIC ASD-OPS OK & ODOR IN CABIN.  REPLACED APU, OPS CK'S GOOD.

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