# SDR ASAA2023032842646

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 28, 2023
- Submitted: March 31, 2023
- Operation: Air carrier
- Aircraft: [N589AS](https://openairdocs.org/aircraft/N589AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35686
- Aircraft time: 55,259 hours, 16,286 cycles
- System (JASC): [2420 · AC Generation System](https://openairdocs.org/jasc/2420)
- Part: Contactor
- Part number: 11519681
- Condition: Faulty
- Location: E/E, P91
- Stage of operation: NR
- 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/ASAA2023032842646

## Discrepancy

APU GEN OFF BUS LIGHT DOES NOT ILLUMINATE AFTER APU START W/APU ELECTRIC AVAILABLE BUT NOT ON BUS. LIGHT BULBS TEST OK. GROUNDED - YES. REPLACED AUX POWER BREAKER C803 REF B737-800 AMM 24-21-41.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.