# SDR ASAA0956538

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 3, 2009
- Submitted: September 8, 2009
- Operation: Air carrier
- Aircraft: [N560AS](https://openairdocs.org/aircraft/N560AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35179
- Aircraft time: 11,729 hours, 3,707 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Starter Gen
- Part number: 28B5457
- Part serial: 76B0548
- Condition: Faulty
- Location: Apu
- Part time: 11,729 hours, 3,707 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA0956538

## Discrepancy

APU FAILED WITH FAULT LIGHT.  STARTED APU UNABLE TO CONFIRM DISCREPANCY.  PERFORMED BITE CHECK OF APU.  FOUND FAULT CODE 49 41012 FOR FLT LEGS 0 1 & 2 & 49 41248 FOR FLT LEGS 3 & 4 PERFORMED FIM 49 40 00 810 803 A F.1 4(A E).  REPLACED STARTER/GEN REF MM 49 41 31 & ALSO REPLACED STARTER CONVERTER UNIT REF MM 49 41 61.  ALL OPS & LEAK CHECKS GOOD.

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