# SDR ASAA12511599

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 24, 2012
- Submitted: May 30, 2012
- Operation: Air carrier
- Aircraft: [N512AS](https://openairdocs.org/aircraft/N512AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 39043
- Aircraft time: 14,194 hours, 4,513 cycles
- Engine: Cfmint CFM567B273
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Apu
- Part number: 38007021
- Part serial: P7343
- Condition: Failed
- Part time: 8,597 hours, 9,608 cycles
- Stage of operation: NR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA12511599

## Discrepancy

CSS FAILED WITH APU FAULT LIGHT. CSS INCOMPLETE DID NOT ATTEMPT THIRD START.  ACFT GROUNDED.  FAULT HISTORY: MSG 49-31016 MSG 49-41010 ( NO ACCELL SHUTDOWN). MSG 49-91005 (HIGH OIL PRESS) MSG49 91007 (LOW OIL PRESS). MESSAGES 49 31016 (OVERTEMP). 49-41010, 49-41010, & 49-11019.  AFTER REVIEWING DATA POWERPLANT ENGINEERING RECOMMENDS REMOVING APU.  REPLACED APU IAW T/C 78349010. OPS CHECKED GOOD.

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