# SDR UALA2011072203741

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 21, 2011
- Submitted: August 17, 2011
- Operation: Air carrier
- Aircraft: N543UA
- Make and model: Boeing 757222
- Aircraft serial: 25698
- Aircraft time: 75,914 hours, 22,065 cycles
- Engine: Pwa PW2037
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Exciter
- Part number: 106170756
- Part serial: 67
- Condition: Faulty
- Location: Apu Engine
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2011072203741

## Discrepancy

APU FAULT ON START.  BITE APU BOX, 2 MSG LATCHED, NO FLAME LIGHT-OFF, CLEARED MSG AND TRY RESTART, NO JOY.  GOT 30 PERCENT THEN APU FAULT STATUS MSG. EXCITER FAULTY.

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