# SDR ASAA2017052120847

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 21, 2017
- Submitted: May 23, 2017
- Operation: Air carrier
- Aircraft: [N587AS](https://openairdocs.org/aircraft/N587AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35684
- Aircraft time: 36,801 hours, 10,725 cycles
- System (JASC): [4970 · APU Indicating System](https://openairdocs.org/jasc/4970)
- Part: Warning System
- Condition: False Activation
- Location: Cockpit
- Stage of operation: NR
- 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/ASAA2017052120847

## Discrepancy

FAULT LIGHT ILLUMINATED DURING APU START. FOLLOWED QRH. AFTER 5 MIN RE-ATTEMPTED START AND LIGHT ILLUMINATED AGAIN. GROUNDED - YES. APU LAST FLIGHT LEG FAULT HISTORY SHOWS FAULT LIGHT MAINTENANCE MESSAGE 49-61157, ECU INTERNAL FAILURE. PERFORMED APU BITE PER FIM 49-60 TASK 804. PERFORMED APU BITE PER FIM 49-60 TASK 801. NO MAINTENANCE MESSAGES WERE SHOWN ON CURRENT STATUS PAGE. APU STARTED NORMALLY.

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