# SDR DXTA2026010506395

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 1, 2026
- Submitted: January 16, 2026
- Operation: Air carrier
- Aircraft: [N387QS](https://openairdocs.org/aircraft/N387QS), registered now
- Make and model: Cessna 680SOV
- Aircraft serial: 6800119
- Aircraft time: 16,859 hours, 11,317 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Control Valve
- Condition: Stuck
- Location: Cabin Temp
- Stage of operation: NR
- How discovered: O
- Nature of condition: B, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA2026010506395

## Discrepancy

BURNING ODOR IN CABIN. GOT VERY HOT & CHKD TEMP CONTROLLER, TEMP FLASHING 300 & E5. ATTEMPTED TO ADJUST CONTROLLER TO REDUCE TEMP,  NO SUCCESS. PILOT SIDE OF CONTROLLER SEEMS TO BE WORKING NORMALLY.  POWERED ACFT & BEEN ABLE TO DUPLICATE DISCREPANCY.  PERFORMED ECS BURN OUT PROCEDURE & NOTED TEMP ON CABIN DUCT STAY STUCK BTWN 120-180 DEGREES, NEVER WENT DOWN AS COCKPIT ONE WHICH DUCT TEMP DROPS AT 40 DEGREES WHEN SELECTED FULL COLD.  ACCESSED CABIN & COCKPIT TEMP CONTROL VALVES ON AFT MX BAY & NOTED COCKPIT VALVE POSITION IND MOVING WHEN SELECTED COLD OR WARM TO CLOSE OR OPEN, CABIN TEMP CONTROL VALVE ISN'T MOVING WHEN COMMANDED TO COLD.  ACCOMPLISHED T/S STEP IAW AMM 21-61-00, STEP E, & FOUND ALL WIRE CHKS OK,  INSPECTED VALVE VT014.   TURNED EVERYTHING DOWN,  REMOVED CABIN TEMP CONTROL VALVE VT014 IAW AMM 21-22-05 & FOUND BUTTERFLY STUCK IN OPEN POSITION, CAUSING OVRHT ON DUCT DUE ALL BLEED AIR PASSING & BURN ODOR IN CABIN, UNDER DISCREPANCY 3.1  SWAPPED WITH COCKPIT TEMP CONTROL VALVE IAW AMM 21-22-05, POWERED BACK ON & GOT E5 CODE FLASHING ON COCKPIT SIDE WHICH CONFIRM VALVE INTERNALLY DAMAGED & STUCK, ABLE TO COOL CABIN USING VALVE FROM COCKPIT, SWAPPED BACK TO ORIG CONFIG.   R & R  CABIN TEMP CONTROL VALVE IAW AMM 21-22-05, OPS & LEAK CHKD OK, WORKED IAW AMM 21-22-05. OK FOR SERVICE.

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