# SDR ASAA2012081592727

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 1, 2012
- Submitted: August 30, 2012
- Operation: Air carrier
- Aircraft: [N594AS](https://openairdocs.org/aircraft/N594AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35191
- Aircraft time: 16,914 hours, 5,269 cycles
- Engine: Cfmint CFM567B273
- 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: CR
- 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/ASAA2012081592727

## Discrepancy

FAULT LIGHT DURING INFLT APU START. ( NOTE )  FL 380 TEMP -44C TEMP FLUCTUATED  800-820 DEGREES.  PRIOR FAULT LIGHT ILLUMINATION.  VERBAL FROM FLIGHT CREW WAS APU STARTED ON 2ND ATTEMPT ABOVE FL 290.  RAN APU BITE FOUND MAINT MESSAGE 49-41010 NO ACCELARATION SHUTDOWN.  C/W FAULT ISOLATION TASK 49-40-00-810-801.  COULD NOT DUPLICATE MALFUNCTION.  NO HISTORY LAST 30 DAYS. CURRENTLY ON DEFERRAL FOR CSS VERIFICATION FLIGHT.

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