# SDR ASAA2023031242375

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 12, 2023
- Submitted: March 16, 2023
- Operation: Air carrier
- Aircraft: [N938AK](https://openairdocs.org/aircraft/N938AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 43381
- Aircraft time: 2,728 hours, 790 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: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023031242375

## Discrepancy

APU "FAULT" LIGHT WHILE ATTEMPTING START. GROUNDED - YES. IN OMF FOUND MAINT MESSAGE 49-41254 START CONVERTER UNIT SHOWS START SYSTEM INOP. PERFORMED GVI OF CONNECTOR P6 REF B737-9 AMM 49-11-01 AND B737-9 IFIM 49-40-00-810-818. NO DEFECTS NOTED. STARTED AND RAN APU 5 TIMES WITH NO FAULTS NOTED. APU STARTS AND OPERATES NORMAL.

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