# SDR ASAA2016082717820

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 27, 2016
- Submitted: August 31, 2016
- Operation: Air carrier
- Aircraft: [N495AS](https://openairdocs.org/aircraft/N495AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41728
- Aircraft time: 2,007 hours, 649 cycles
- System (JASC): [2420 · AC Generation System](https://openairdocs.org/jasc/2420)
- Part: Electrical Sys
- Condition: Malfunctioned
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2016082717820

## Discrepancy

APU WILL NOT TRANSFER POWER TO LEFT SIDE. A/C TRANSFER BUSS 1 ACCEPTS POWER FROM GP AND GENERATOR 1 WILL NOT ACCEPT POWER FROM APU, SOURCE OFF LIGHT ILLUMINATES. ACFT GROUNDED.  T/S SYSTEM, FOUND AUXILIARY POWER BREAKER C803 INOPERATIVE.  R & R AUXILIARY POWER BREAKER, REF AMM 24-21-41-400-801.  OPS CHECK OK.

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