# SDR ASAA2018101526469

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 11, 2018
- Submitted: October 15, 2018
- Operation: Air carrier
- Aircraft: [N440AS](https://openairdocs.org/aircraft/N440AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41705
- Aircraft time: 19,932 hours, 6,619 cycles
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Ignition Unit
- Part number: 38880587
- Part serial: 130236
- Condition: Failed
- Location: Apu
- Part time: 3,183 hours, 6,028 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/ASAA2018101526469

## Discrepancy

APU FAULT LIGHT CAME ON AND WOULD NOT RESET. GROUNDED - YES. REMOVED AND REPLACED APU IGNITION UNIT AND LEAD. OPS CHECK GOOD. REFERENCE APPLICABLE STEPS IN AMM 49-41-31 AND 49-41-52.

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