# SDR ASAA2016071317366

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 13, 2016
- Submitted: July 15, 2016
- Operation: Air carrier
- Aircraft: [N534AS](https://openairdocs.org/aircraft/N534AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35202
- Aircraft time: 21,947 hours, 6,405 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Exciter
- Part number: 38880587
- Part serial: 086971101476
- Condition: Failed
- Location: Apu
- Part time: 1,797 hours, 3,833 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/ASAA2016071317366

## Discrepancy

APU FAULT LIGHT ILLUMINATES DURING START.  ACFT GROUNDED.  REMOVED AND REPLACED EXCITER IGNITION UNIT IAW AMM 49-41-31.

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