# SDR ASAA2013102696234

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 26, 2013
- Submitted: October 28, 2013
- Operation: Air carrier
- Aircraft: [N557AS](https://openairdocs.org/aircraft/N557AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35176
- Aircraft time: 28,355 hours, 8,369 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Igniter
- Part number: 38880587
- Part serial: 110279
- Condition: Failed
- Location: Apu
- Part time: 2,879 hours, 3,929 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2013102696234

## Discrepancy

APU FAILED TO START ON THREE ATTEMPTS.  FAULT LIGHT ILLUMINATED WITH MAINT MESSAGE 49-41181, IGNITION UNIT CIRCUIT SHOWS OPEN.  CYCLED AUX PWR UNIT CIRCUIT BREAKER.  NO HELP.  ACFT GROUNDED. REPLACED APU IGNITER PLUG, LEAD, AND APU IGNITION UNIT IAW MM 49-41-51-400-801 AND 49-41-52-400-801 AND 49-41-31-400-801.  OPS CHECK NORMAL.

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