# SDR UALA2012110506340

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 3, 2012
- Submitted: November 15, 2012
- Operation: Air carrier
- Aircraft: [N544UA](https://openairdocs.org/aircraft/N544UA), registered now
- Make and model: Boeing 757222
- Aircraft serial: 25322
- Aircraft time: 78,960 hours, 22,740 cycles
- Engine: Pwa PW2037
- System (JASC): [4960 · APU Controls](https://openairdocs.org/jasc/4960)
- Part: Control Valve
- Part number: 97980612
- Part serial: 170
- Condition: Faulty
- Location: Apu
- 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/UALA2012110506340

## Discrepancy

APU SHUTDOWN AT GATE UNABLE TO RESTART.  FOUND APU SURGE VALVE SOLENOID DAMAGE.  REPLACED APU SURGE VALVE REF MM 49-53-01.  BITE CONTROLLER MINIFLAG 9 REMOVED AND REPLACED LOAD COMPRESSOR INLET TEMP SENSOR AS PRECAUTION, APU OPS NORMAL.

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