# SDR ASAA2023110145986

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 1, 2023
- Submitted: November 3, 2023
- Operation: Air carrier
- Aircraft: [N971AK](https://openairdocs.org/aircraft/N971AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 43339
- Aircraft time: 6,904 hours, 1,983 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: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023110145986

## Discrepancy

APU "FAULT" LIGHT ON GRND START. FAULT CODE 49-41254 (MAINTENANCE CODE) STARTER CONVERTER UNIT SHOWS START SYSTEM INOP. GROUNDED - YES. PERFORMED APU BITE - FOUND FAULT CODE 49-41012. RMVD AND REINSTALLED SCU. STARTED APU 3X - NO ISSUES. SYS OPS NML. REF IFIM 49-41012.

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