# SDR UALA2013072605249

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 25, 2013
- Submitted: August 21, 2013
- Operation: Air carrier
- Aircraft: [N667UA](https://openairdocs.org/aircraft/N667UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 29239
- Aircraft time: 53,466 hours, 14,062 cycles
- Engine: Pwa PW4056
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Valve
- Part number: 97980612
- Part serial: 219
- Condition: Malfunctioned
- Location: Apu
- Stage of operation: TX
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2013072605249

## Discrepancy

APU AUTOSHUTDOWN TWICE PRIOR TO STARTING NR 2 ENGINE.  AUDIBLE VIBRATION AND COMPRESSOR STALL.  MOTORED NR 1 ENGINE ALL PARAMETERS GOOD. AS SOON AS DEMAND WAS REMOVED APU AUTO SHUTDOWN WITH VIBRATION AND SURGE. REPLACED SURGE VALVE IAW MM, OPS CHECKED GOOD THROUGH 4 ENGINE STARTS.

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