# SDR ASAA2021051234803

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 12, 2021
- Submitted: May 14, 2021
- Operation: Air carrier
- Aircraft: [N577AS](https://openairdocs.org/aircraft/N577AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35186
- Aircraft time: 50,691 hours, 15,074 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Apu
- Condition: Unknown
- Stage of operation: LD
- 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/ASAA2021051234803

## Discrepancy

AFTER LANDING APU FAILED TO START, FAULT LIGHT ILLUMINATED. GROUNDED - YES. PERFORMED APU BITE. CURRENT FAULT SHOWS 49-41180. PERFORMED B737-800 FIM 49-40 TASK 804, NO FAULTS FOUND. NO CURRENT FAULTS PRESENT.

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