# SDR CNQ2003F00002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 29, 2003
- Submitted: November 4, 2003
- Operation: Air carrier
- Aircraft: [N900QS](https://openairdocs.org/aircraft/N900QS), registered now
- Make and model: Cessna 750
- Registry model: [Cessna 750](https://openairdocs.org/model/cessna-750) (OpenAirDocs)
- Aircraft serial: 7500123
- Engine: Allsn AE3007C
- System (JASC): [2161 · Cabin Temperature Controller](https://openairdocs.org/jasc/2161)
- Part: Controller
- Part number: IE4510
- Part serial: 02AT04
- Condition: Shorted
- Location: Cabin Temp
- Part time: 2,171 hours
- Stage of operation: DE
- 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/CNQ2003F00002

## Discrepancy

WHILE DESCENDING THROUGH FL330, THE COCKPIT TEMPERATURE CIRCUIT BREAKER TRIPPED.  COCKPIT DISPLAY UNITS NR 1 AND NR 2 WENT INOPERATIVE.  UPON FURTHER DESCENT,  COCKPIT DISPLAY UNITS NR 4 AND NR 5 WENT INOPERATIVE.  ALL DISPLAY UNITS WORKED OK AFTER COOLING OFF.  REPLACED TEMPERATURE CONTROLLER, SYSTEM OPERATIONALLY CHECKED GOOD.

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