# SDR ASAA2015041911416

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 19, 2015
- Submitted: April 23, 2015
- Operation: Air carrier
- Aircraft: [N435AS](https://openairdocs.org/aircraft/N435AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43292
- Aircraft time: 5,725 hours, 1,897 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Apu
- Condition: Malfunctioned
- Stage of operation: CR
- 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/ASAA2015041911416

## Discrepancy

APU FAILED TO START AT FL 36 & FL 320 WITH FAULT LIGHT. FAULT LIGHT ILLUMINATED DURING APU START ATTEMPT FL360, FAULT LIGHT REMAINED ON FOR 4 MINUTES 40 SEC, FAULT LIGHT ILLUMINATED DURING SECOND ATTEMPT AT FL320, FAULT LIGHT REMAINED ILLUMINATED FOR 6 MINUTES 15 SECS, NO THIRD ATTEMPT MADE IAW APU FAULT LIGHT QRH.  ACFT GROUNDED.

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