# SDR ASAA0956191

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 10, 2009
- Submitted: July 14, 2009
- Operation: Air carrier
- Aircraft: [N577AS](https://openairdocs.org/aircraft/N577AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35186
- Aircraft time: 9,071 hours, 2,631 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Apu
- Condition: Malfunctioned
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA0956191

## Discrepancy

WHILE PERFOMING T/C 08031001 FOUND APU START CONV CB EXTENDED P91 PANEL E AND E COMP.  ACFT GROUNDED.  PERFORMED APU BITE 49-60 TASK 801. NO MESSAGES FOUND. ACCOMPLISHED FIM TASK 49-40-00-810-810. NO DEFECTS FOUND. GRND RAN APU 2 TIMES NO FAULTS FOUND REF 49-11-00-060-801. RESET CBIAW MM 20 60 01. INSPECTED CB WIRING AT P91 ALL CKS NORMAL. NO HISTORY ON THIS MR.

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