# SDR ASAA2017112822740

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 28, 2017
- Submitted: December 1, 2017
- Operation: Air carrier
- Aircraft: [N563AS](https://openairdocs.org/aircraft/N563AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35180
- Aircraft time: 42,082 hours, 12,640 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Exciter
- Part number: 38880587
- Part serial: 131192
- Condition: Failed
- Location: Apu
- Part time: 1,254 hours, 2,299 cycles
- 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/ASAA2017112822740

## Discrepancy

APU FAULT LIGHT ILLUMINATED DURING APU START. APU DID NOT START. GROUNDED - YES. VERIFIED APU WILL NOT ACCELERATE PAST 12% DURING START. REMOVED & REPLACED APU IGNITION EXCITER. OPS CHECK NORMAL, REF B737-800 FIM 49-40 TASK 805 & AMM 49-41-31-000-801, 49-41-31-400-801, & 49-11-00-860-801.

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