# SDR UALA2010011900233

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 19, 2010
- Submitted: January 22, 2010
- Operation: Air carrier
- Aircraft: [N228UA](https://openairdocs.org/aircraft/N228UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 30556
- Aircraft time: 33,021 hours, 4,077 cycles
- Engine: Pwa PW4090
- System (JASC): [2100 · Air Conditioning System](https://openairdocs.org/jasc/2100)
- Part: Valve
- Part number: 8102212
- Part serial: 200110012
- Condition: Malfunctioned
- Location: Cabin Air
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2010011900233

## Discrepancy

F-D COMPARTMENT SHOWS NO AMBER TEMP DEMAND SETTIING IN AUTO OR MANUAL. SWAPPED TRIM AIR MODULATING VALVES BETWEEN FLIGHT DECK AND C ZONE.  F- D TEMP CONTROL AND INDICATION NORMAL.  DEACTIVATED ZONE C TRIM AIR MODULATION VALVE TO CLOSED POSITION.  REPLACED TRIM VALVE, OPS CKD OK.

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