# SDR CALA2022112803240

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 28, 2022
- Submitted: November 28, 2022
- Operation: Air carrier
- Aircraft: [N785UA](https://openairdocs.org/aircraft/N785UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26954
- Aircraft time: 102,789 hours, 13,566 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Condition: Faulty
- Location: Cabin Air
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2022112803240

## Discrepancy

ON AIR SYS SCHEMATIC ZONE B SHOWS NO TEMP CTRL DISPLAYED MAGEN TA TRIM AIR ZONEB INOPERATIVE WITH ASSOCIATED ZONE. REPLACED ZONE B TRIM AIR MODULATING VALVE. SYSTEM TEST GOOD. LEAK CK GOOD.

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