# SDR ASAA2012070592501

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 5, 2012
- Submitted: July 10, 2012
- Operation: Air carrier
- Aircraft: [N519AS](https://openairdocs.org/aircraft/N519AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 36482
- Aircraft time: 12,993 hours, 3,943 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Exciter
- Part number: 38880587
- Part serial: 086971102770
- Condition: Failed
- Location: Apu
- Part time: 7,200 hours, 5,884 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2012070592501

## Discrepancy

APU FAULT LIGHT ILLUMINATED ON START ATTEMPT.  WAITED 5 MIN, FAULT LIGHT EXTINGISHED ATTEMPTED SECOND START, FAULT LIGHT ILLUMINATED AGAIN.  R & R APU IGNITION UNIT, IGNITER PLUG, AND IGNITION LEAD IAW AMM 49-41-31, 49-41-51 AND 49-41-52.  PERFORMED APU STARTING AND OPERATION IAW AMM 49-11-00-860-801, APU STARTED OK AND OPS CHECKED GOOD.

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