# SDR DXTA200808183233

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 18, 2008
- Submitted: May 14, 2009
- Operation: Air carrier
- Aircraft: [N944QS](https://openairdocs.org/aircraft/N944QS), registered now
- Make and model: Cessna 750
- Registry model: [Cessna 750](https://openairdocs.org/model/cessna-750) (OpenAirDocs)
- Aircraft serial: 7500144
- Aircraft time: 7,694 hours, 4,692 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Ecu
- Part number: 73838433
- Part serial: 9912106
- Condition: Defective
- Location: Enironmental Sys
- Part time: 2,137 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA200808183233

## Discrepancy

IN FLIGHT, CREW SMELLED DEEP MUSTY SMELL FOLLOWED BY BURNING SMELL FROM ENVIROMENTAL SYS. ISOLATED THE COCKPIT PAC AND SMELL WENT AWAY AFTER ABOUT 5 MIN. REPLACED THE AFT (COCKPIT) ECU IAW MM 21-51-00 AND ALSO REPLACED BOTH WATER SEPARATOR BAGS. SERVICED BOTH ECU'S. STARTED APU AND RAN BOTH PACKS. LEAK CHECK GOOD. RAN COCKPIT ECU FOR 30 MINUTES, OPERATES NORMAL.

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