# SDR ASAA2016022115609

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 21, 2016
- Submitted: February 24, 2016
- Operation: Air carrier
- Aircraft: [N590AS](https://openairdocs.org/aircraft/N590AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35687
- Aircraft time: 31,258 hours, 9,464 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Exciter
- Part number: 38880587
- Part serial: 120334
- Condition: Failed
- Location: Apu
- Part time: 1,238 hours, 2,598 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/ASAA2016022115609

## Discrepancy

ON GROUND TRIED TO START APU, WOULD NOT START W/ FAULT LIGHT ILLUMINATED.  AFTER 5 MINUTES FAULT LIGHT EXTINGUISHED.  ACFT GROUNDED.  R & R APU IGNITION UNIT REF AMM 49-41-31,  R & R APU IGNITION LEAD REF AMM 49-41-52.  OPS CHECK NORMAL, APU STARTS NO CURRENT FAULTS LOGGED.

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