# SDR ASAA2016070517277

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 5, 2016
- Submitted: July 7, 2016
- Operation: Air carrier
- Aircraft: [N570AS](https://openairdocs.org/aircraft/N570AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35185
- Aircraft time: 35,920 hours, 10,644 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Exciter
- Part number: 38880587
- Part serial: 120285
- Condition: Failed
- Location: Apu Engine
- Part time: 2,006 hours, 4,195 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/ASAA2016070517277

## Discrepancy

APU FAULT LIGHT ON DURING START.  ACFT GROUNDED.  ACCOMPLISHED FIM TASK 49-40 TASK 802 AS REQUIRED.  FOUND APU EXCITER, CONNECTOR, AND LEAD BAD. REMOVED AND REPLACED EXCITER IGNITION UNIT IAW AMM 49-41-31.  REMOVED AND REPLACED IGNITER CONNECTOR IAW AMM 49-41-51.  REMOVED AND REPLACED IGNITED CONNECTOR LEAD IAW AMM 49-41-52. RAN APU, OPS CHECKED GOOD.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.