# SDR ASAA2023092445294

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 24, 2023
- Submitted: September 26, 2023
- Operation: Air carrier
- Aircraft: [N948AK](https://openairdocs.org/aircraft/N948AK), registered now
- Make and model: Boeing 737-9
- Registry model: [Boeing 737-9](https://openairdocs.org/model/boeing-737-9) (OpenAirDocs)
- Aircraft serial: 44090
- Aircraft time: 3,853 hours, 1,117 cycles
- System (JASC): [2420 · AC Generation System](https://openairdocs.org/jasc/2420)
- Part: Contactor
- Part number: 51080205001
- Condition: Faulty
- Location: E/E Compartment
- 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/ASAA2023092445294

## Discrepancy

ON PREFLIGHT FOUND THE SOURCE OFF WITH APU SELECTED ON LEFT / #1. GROUNDED - YES. REMOVED AND REPLACED AUXILIARY POWER BREAKER C803- P91 AND PERFORMED GOOD TEST OF THE AUXILIARY POWER BREAKER AS PER AMM 24-21-41/401.

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