# SDR ASAA2018112127073

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 21, 2018
- Submitted: November 27, 2018
- Operation: Air carrier
- Aircraft: [N517AS](https://openairdocs.org/aircraft/N517AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35197
- Aircraft time: 38,272 hours, 11,329 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Ignition Unit
- Part number: 38880587
- Part serial: 111147
- Condition: Failed
- Location: Apu
- Part time: 1,530 hours, 2,838 cycles
- Stage of operation: TX
- 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/ASAA2018112127073

## Discrepancy

ON TAXI IN, STARTED APU, RECEIVED "FAULT " LIGHT. GROUNDED - YES. REF FIM 49-40 TASK 802, REMOVED AND REPLACED APU IGNITION UNIT PER AMM 49-41-31. ACCOMPLISHED MULTIPLE APU STARTS, NO DEFECTS NOTED. CURRENT STATUS SHOWS NO FAULTS.

---
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.