# SDR UALA2011121206828

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 11, 2011
- Submitted: January 13, 2012
- Operation: Air carrier
- Aircraft: [N781UA](https://openairdocs.org/aircraft/N781UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26945
- Aircraft time: 62,905 hours, 11,125 cycles
- Engine: Pwa PW4077
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Control Valve
- Part number: 8102042
- Part serial: 1654
- Condition: Failed
- Location: Cabin Air
- Stage of operation: NR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2011121206828

## Discrepancy

MAINT MESSAGE 21-24102 DISPLAYED WHEN DOING CABIN TEMP CONTROL BITE TEST. RIGHT UPPER FLOW CONTROL VALVE INOPERATIVE. REPLACED UPPER FLOW CONTROL VALVE PER MM, OPS CHECKED NORMAL.

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