# SDR ASAA2013042294584

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 22, 2013
- Submitted: April 24, 2013
- Operation: Air carrier
- Aircraft: [N559AS](https://openairdocs.org/aircraft/N559AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35178
- Aircraft time: 24,602 hours, 7,395 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Starter Gen
- Part number: 1152464265
- Part serial: 115246401443
- Condition: Failed
- Location: Apu
- Part time: 24,595 hours, 7,394 cycles
- Stage of operation: TX
- 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/ASAA2013042294584

## Discrepancy

APU UNABLE TO START AFTER THREE ATTEMPTS.  LOW OIL PRESSURE LIGHT ILLUMINATED FOLLOWED BY FAULT LIGHT ON EACH ATTEMPT.  REPLACED APU STARTER GENERATOR UNIT IAW AMM 49-41-21 AND APU STARTER POWER UNIT IAW AMM 49-41-41.  APU GROUND VERIFICATION TESTS PASS.

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