# SDR ASAA2019091230702

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 12, 2019
- Submitted: September 16, 2019
- Operation: Air carrier
- Aircraft: [N530AS](https://openairdocs.org/aircraft/N530AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 36578
- Aircraft time: 36,792 hours, 10,854 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Exciter
- Part number: 38880587
- Part serial: 140217
- Condition: Failed
- Location: Apu
- Part time: 2,897 hours, 4,913 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/ASAA2019091230702

## Discrepancy

APU FAULT LIGHT ILLUMINATED DURING START. FAULT LIGHT EXTINGUISHED AFTER 5 MINUTES. GROUNDED - YES. APU WOULD NOT START, TRIED TWICE. REMOVED AND REPLACED APU EXCITER UNIT IAW AMM 49-41-31-000-801 AND 49-41-31-400-801, ETOPS GROUND FUNCTIONAL CHECK GOOD IAW AMM 49-11-00-860-801.

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