# SDR KY7A20260716001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 16, 2026
- Submitted: July 20, 2026
- Operation: Air carrier
- Aircraft: [N820DC](https://openairdocs.org/aircraft/N820DC), registered now
- Make and model: Frchld SA227DC
- Aircraft serial: DC820B
- Aircraft time: 42,608 hours, 45,566 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Controller
- Part number: HYLZ504341
- Part serial: 987F
- Condition: Faulted
- Location: Zone 100
- Stage of operation: CL
- How discovered: O
- Nature of condition: M, B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/KY7A20260716001

## Discrepancy

SMOKE IN CABIN, A/C BLOWING EXTREMELY HOT AIR. EMERGENCY DECLARED AND AIRCRAFT RETURNED TO FIELD.  R & R RH FLOW CONTROL VALVE IAW SA227 MM 21-10-20, R+R LH+RH MIXING VALVES IAW SA227 MM 21-40-00, R+R CABIN TEMP CONTROLLER IAW SA227 MM 21-60-00, OPS + LEAK CHECKS GOOD. RTS CHECK C/W

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