# SDR ASAA2013102096207

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 20, 2013
- Submitted: October 23, 2013
- Operation: Air carrier
- Aircraft: [N517AS](https://openairdocs.org/aircraft/N517AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35197
- Aircraft time: 18,729 hours, 5,658 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Exciter
- Part number: 38880587
- Part serial: 086971102431
- Condition: Unknown
- Location: Apu
- Part time: 7,750 hours, 8,103 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2013102096207

## Discrepancy

APU FAILED TO START.  RECEIVED A FAULT LIGHT AND MAINT MESSAGE 49-41180.  ACFT GROUNDED.  STARTED APU NUMEROUS TIMES SUCCESSFULLY.  FAULT CODE DOES NOT REAPPEAR.  OPS CHECKED GOOD IAW FIM 49-40, TASK 804.   REMOVED AND REPLACED APU IGNITION EXCITER OPS CHECKED GOOD. REF. AMM 49-41-31.

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