# SDR ASAA2014033107383

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 31, 2014
- Submitted: April 3, 2014
- Operation: Air carrier
- Aircraft: [N433AS](https://openairdocs.org/aircraft/N433AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41704
- Aircraft time: 1,776 hours, 573 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Apu
- Condition: Malfunctioned
- Part time: 6,639 hours, 7,604 cycles
- Stage of operation: TX
- 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/ASAA2014033107383

## Discrepancy

APU WOULD NOT START WITH FAULT LIGHT ON GROUND.  WAITED FIVE MINUTES AND ATTEMPTED AGAIN, SAME RESULT.  ACFT GROUNDED.  ACCOMPLISHED FIM 49-40, TASK 805.  AC & APU WIRING IS GOOD. NO DEFECTS NOTED. CHANGED APU IGNITION UNIT AS PRECAUTION IAW MM 49-41-31-400-801. OPS CHECKED GOOD.

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