# SDR AALA202507106424

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 9, 2025
- Submitted: July 10, 2025
- Operation: Air carrier
- Aircraft: [N799AN](https://openairdocs.org/aircraft/N799AN), registered now
- Make and model: Boeing 777223
- Aircraft serial: 30258
- Aircraft time: 92,002 hours, 11,987 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 8102212
- Condition: Faulted
- Location: Zone 200
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202507106424

## Discrepancy

AIRCRAFT WAS NOT GROUNDED: FLIGHT DIVERTED DUE TO UNCONTROLLABLE AFT CABIN TEMP FROM ROW 26-40 ZONE F TRIM SHOWS FAILED. AIRCRAFT LANDEDED OVERWIGHT AND AN EMERGENCY DECLARE. LAMNDED WITHOUT INCIDENT. MAINTENANCE REPLACED ZONE "F" TRIM AIR MODULATING VALVE IAW AMM 21-61-02.

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