# SDR ASAA2016071017332

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 10, 2016
- Submitted: July 13, 2016
- Operation: Air carrier
- Aircraft: [N535AS](https://openairdocs.org/aircraft/N535AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35200
- Aircraft time: 21,783 hours, 6,331 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Ignition Unit
- Part number: 38880587
- Part serial: 100581
- Condition: Failed
- Location: Apu
- Part time: 6,228 hours, 9,534 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/ASAA2016071017332

## Discrepancy

APU START UNSUCCESSFUL ON TAXI IN.  FAULT LIGHT OBSERVED.  ACFT GROUNDED.  TROUBLESHOOT IAW FIM 802, NO FLAME SHUTDOWN.  FOUND INOPERATIVE IGNITION SYS, R & R IGNITION UNIT IAW AMM 49-41-31.  R & R APU PLUG & LEAD IAW AMM 49-41-00.  APU OPS CHECK NORMAL.

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