# SDR ASAA2019062329831

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 23, 2019
- Submitted: July 2, 2019
- Operation: Air carrier
- Aircraft: [N419AS](https://openairdocs.org/aircraft/N419AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41734
- Aircraft time: 24,785 hours, 8,090 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Starter Gen
- Condition: Failed
- Location: Apu
- Part time: 5,740 hours, 11,189 cycles
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019062329831

## Discrepancy

APU WILL NOT START. FAULT & MAINT LIGHT. GROUNDED - YES.  TROUBLE SHOOTING ON W/O: 458518 TASKCARD: N/R-00002 FOUND MAINT MSG 49-41244 GEN DIODE FAIL SHUTDOWN. ACCOMPLISHED B737-900 FIM 49-40 TASK 806. APU REQUIRES STARTER GENERATOR REPLACEMENT. REMOVED AND REPLACED APU STARTER GEN REF B737-900 AMM 49-41-21. APU OPS CHECKS GOOD.

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