# SDR AALA202606250843

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 7, 2026
- Submitted: June 26, 2026
- Operation: Air carrier
- Aircraft: [N905NN](https://openairdocs.org/aircraft/N905NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31156
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Valve
- Part number: 3989085
- Part serial: AA001
- Condition: Inoperative
- Location: Zone 100
- Part time: 17,067 hours, 7,945 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202606250843

## Discrepancy

AIRCRAFT WAS GROUNDED: RETURN BACK TO DALLAS DUE TO HIGH CABIN TEMPERATURE. WAS UNABLE TO GET CABIN TEMPERATURE BELOW 90 DEGREES. EMERGENCY DECLARED LANDED WITHOUT INCIDENT. MAINTENANCE L/H TEMP/TRIM VALVE INOP, REMOVED AND INSTALLED SERVICEABLE VALVE, OPS CHECK GOOD, TEMP IS GOOD FORWARD AND AFT CABIN, IAW AMM 21-51-16.

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