# SDR 9JLA2022042533543

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 15, 2022
- Submitted: April 25, 2022
- Operation: Air carrier
- Aircraft: [N61GB](https://openairdocs.org/aircraft/N61GB), registered now
- Make and model: Beech 400A
- Registry model: [Beech 400A](https://openairdocs.org/model/hawker-beechcraft-400a) (OpenAirDocs)
- Aircraft serial: RK341
- Aircraft time: 5,272 hours, 4,168 cycles
- System (JASC): [2163 · Cabin Temperature Sensor](https://openairdocs.org/jasc/2163)
- Part: None
- Condition: None
- 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/9JLA2022042533543

## Discrepancy

THE FLIGHT CREW REPORTED WHILE AT FL360 - FL400 NO CABIN TEMPERATURE CONTROL FROM COCKPIT CONTROLLER IN AUTO OR MAN CABIN TEMP RANGED FROM 20C TO -10C OVER 3.7 HOUR FLIGHT. THE MAINTENANCE TEAM DISCOVERED A LOOSE CONNECTION ON CABIN PROPORTIONING VALVE AND ALSO FOUND CABIN AND COCKPIT TEMP CONTROL VALVE LINES SWAPPED. CORRECTED PNEUMATIC LINE INSTALLATION. OPS CHECKS SATISFACTORY. NOTE: IT WAS DETERMINED THIS AIRCRAFT RECENTLY RETURNED TO SERVICE FROM A LARGE MAINTENANCE EVENT BY A MAJOR MRO SPECIALIZING IN THIS AIRFRAME. A CAR REPORT WAS REQUESTED FROM THIS MRO.

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