# SDR UALA2008120806786

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 7, 2008
- Submitted: December 11, 2008
- Operation: Air carrier
- Aircraft: [N768UA](https://openairdocs.org/aircraft/N768UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26919
- Aircraft time: 54,894 hours, 10,228 cycles
- Engine: Pwa PW4077
- System (JASC): [4950 · APU Bleed Air System](https://openairdocs.org/jasc/4950)
- Part: Pressure Sensor
- Condition: Defective
- Location: Apu
- Stage of operation: IN
- How discovered: O
- Nature of condition: W
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2008120806786

## Discrepancy

APU FAILED DURING STARTING, AUTO SHUTDOWN (TWICE).   REPLACED DELTA PRESSURE SENSOR, TOTAL PRESSURE SENSOR AND SURGE CONTROL VALVE.  RAN APU AND DRY MOTORED ENGINE, OPS OK.

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