# SDR UALA2010122804749

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 28, 2010
- Submitted: December 30, 2010
- Operation: Air carrier
- Aircraft: [N771UA](https://openairdocs.org/aircraft/N771UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26932
- Aircraft time: 61,240 hours, 11,328 cycles
- Engine: Pwa PW4077
- System (JASC): [4950 · APU Bleed Air System](https://openairdocs.org/jasc/4950)
- Part: Control Valve
- Part number: 32908144
- Condition: Defective
- Location: Apu
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2010122804749

## Discrepancy

APU BLEED AIR STATUS MESSAGE.  MAT SHOWS MAINT MESSAGE 49-111 80 SURGE CONTROL VALVE DOES NOT FOLLOW COMMAND.  PLACED DEFECT ON MEL 4952A, APU BLEED AIR SYS INOP.  REPLACED SURGE CONTROL VALVE.

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