# SDR CALA2013100791791

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 6, 2013
- Submitted: October 8, 2013
- Operation: Air carrier
- Aircraft: [N786UA](https://openairdocs.org/aircraft/N786UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26938
- Aircraft time: 72,008 hours, 10,264 cycles
- Engine: Pwa PW40903
- System (JASC): [4950 · APU Bleed Air System](https://openairdocs.org/jasc/4950)
- Part: Pressure Sensor
- Condition: Faulty
- Location: Apu
- Stage of operation: TX
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2013100791791

## Discrepancy

APU AUTO SHUTDOWN AFTER ENGINE START.  REPLACED APU CHECK VALUE DIFFERENTIAL PRESSURE SENSOR & SURGE CONTROL VALVE IAW AMM, OPERATIONS CHECKED NORMAL.  RAN BOTH ENGINES, APU OPERATIONS NORMAL.

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