# SDR CALA2015013093041

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 29, 2015
- Submitted: January 30, 2015
- Operation: Air carrier
- Aircraft: [N221UA](https://openairdocs.org/aircraft/N221UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 30552
- Aircraft time: 57,453 hours, 7,014 cycles
- Engine: Pwa PW40903
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Unknown
- Condition: Malfunctioned
- Location: Apu
- Stage of operation: CR
- 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/CALA2015013093041

## Discrepancy

APU DID NOT START AT ALTITUDE, START OK ON GND.  COMPLETED FIM 49-43 TASK 805 STEPS C 5 - C 7 D 1 & 2.  ACTION PRECAUTION CHANGED PRSOV, PRESS CONTROLLER & PRESS SENSOR.  NO ACTIVE OR LATCHED MSGS.

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