# SDR ASAA2023052843385

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 28, 2023
- Submitted: May 30, 2023
- Operation: Air carrier
- Aircraft: [N924AK](https://openairdocs.org/aircraft/N924AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 43333
- Aircraft time: 6,055 hours, 1,716 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: TX
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023052843385

## Discrepancy

APU FAULT LIGHT ON FIRST START ATTEMPT ON TAXI IN, WAITED 5 MINUTES, FAULT CLEARED, SUCCESSFUL START ON ATTEMPT #2. GROUNDED - YES. PERFORMED TROUBLESHOOTING & FOUND MAINTENANCE MESSAGE 49-41012 NO APU ROTATION SHUTDOWN & 49-41254 START CONVERTER UNIT SHOWS START SYSTEM INOP. PERFORMED B737-9 IFIM TASK 49-40-00-810-805 STEPS 1 & 2. MESSAGES SHOW AS NOT ACTIVE & NO PREVIOUS HISTORY ON A/C. COMPLETED APU START WITH NO FAULTS NOTED NOTED. FAULTS ARE INTERMITTENT.

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