# SDR ASAA2017102122275

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 21, 2017
- Submitted: October 23, 2017
- Operation: Air carrier
- Aircraft: [N478AS](https://openairdocs.org/aircraft/N478AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44105
- Aircraft time: 9,122 hours, 3,079 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Warning Light
- Condition: False Activation
- Location: Apu Fault
- Stage of operation: TX
- How discovered: O
- Nature of condition: N
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017102122275

## Discrepancy

APU FAULT LIGHT ILLUMINATED FOR 1 MINUTE, AFTER TURNING IT OFF AFTER ENGINE START.  ACFT GROUNDED.  ACCOMPLISHED APU BITE CHECK IAW FIM 49-60, 801.  NO CURRENT FAULTS LOGGED. FAULT 49-61223.  FOUND TO BE INTERMITTENT. APU GROUND VERIFICATION CHECKED NORMAL.

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