# SDR ASAA2017070521289

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 5, 2017
- Submitted: July 6, 2017
- Operation: Air carrier
- Aircraft: [N570AS](https://openairdocs.org/aircraft/N570AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35185
- Aircraft time: 39,469 hours, 11,691 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Exciter
- Part number: 38880587
- Part serial: 160312
- Condition: Failed
- Location: Apu
- Part time: 917 hours, 1,863 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/ASAA2017070521289

## Discrepancy

ON TAXI IN APU FAULT LIGHT ILLUMINATED. FOLLOWED QRH PROCEDURE. APU SWITCH OFF, NO RESTART ATTEMPTED. GROUNDED - YES. FAULT MESSAGE 49-41011 (NO FLAME SHUTDOWN). PERFORMED FIM TASK 49-40-00 TASK 802. REMOVED AND REPLACED IGNITION EXCITER UNIT WITH NEW PER AMM 49-41-31. OPS CHECK GOOD. NO FAULTS ON RESTART.

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