# SDR ASAA2023070743941

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 7, 2023
- Submitted: July 11, 2023
- Operation: Air carrier
- Aircraft: [N942AK](https://openairdocs.org/aircraft/N942AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 44102
- Aircraft time: 4,035 hours, 1,170 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: LD
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023070743941

## Discrepancy

ATTEMPTED TWO APU STARTS AFTER LANDING IN SEA. BOTH RESULTED IN AMBER FAULT LIGHTS. GROUNDED - YES. FAULT CODE 49-41012 IS DRIVEN BY CORRELATED FAULT 49-41254 (START CONVERTER UNIT SHOWS START SYSTEM INOP). BOTH FAULTS SHOW NOT ACTIVE, PER B737-9 IFIM TASK 49-40-00-810-818, FAULTS WERE INTERMITTENT. RAN APU MULTIPLE TIMES, APU STARTS NORMALLY AND SUPPLIES POWER AND AIR NORMALLY.

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