# SDR ASAA2013052094857

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 20, 2013
- Submitted: May 23, 2013
- Operation: Air carrier
- Aircraft: [N413AS](https://openairdocs.org/aircraft/N413AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 35205
- Aircraft time: 538 hours, 173 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Warning Light
- Condition: False Activation
- Location: Apu
- Stage of operation: TX
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2013052094857

## Discrepancy

ON APU START, MAINTENANCE LIGHT ILLUMINATED.  ACFT GROUNDED.  PERFORMED APU BITE TEST REF 49-60 TASK 801, FOUND FAULT CODE 49-91227 LOGGED.  VERIFIED OIL LEVEL IAW MM 12-13-31, NO FAULTS FOUND.  ACCOMPLISHED FIM TASK 49-90 TASK 804 NO FAULTS NOTED, GROUND VERIFICATION CHECKS NORMAL.

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