# SDR ASAA2020021042091

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 4, 2020
- Submitted: February 11, 2020
- Operation: Air carrier
- Aircraft: [N462AS](https://openairdocs.org/aircraft/N462AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36362
- Aircraft time: 22,716 hours, 7,386 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Exciter
- Part number: 38880585
- Part serial: J18180167
- Condition: Faulted
- Location: Apu
- Part time: 2,007 hours, 3,370 cycles
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020021042091

## Discrepancy

APU FAULT LIGHT ON START. MULTIPLE ATTEMPTS. GROUNDED - YES. REMOVED AND REPLACED APU IGNITION UNIT  REF B737-900 AMM 49-41-31/401.  OPS CHECK GOOD.

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