# SDR DXTA200702388

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 7, 2007
- Submitted: August 8, 2007
- Operation: Air carrier
- Aircraft: [N978QS](https://openairdocs.org/aircraft/N978QS), registered now
- Make and model: Cessna 750
- Registry model: [Cessna 750](https://openairdocs.org/model/cessna-750) (OpenAirDocs)
- Aircraft serial: 7500187
- Aircraft time: 5,748 hours, 3,525 cycles
- Engine: Allsn AE3007C
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Acm
- Condition: Failed
- Stage of operation: DE
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA200702388

## Discrepancy

DURING DESCENT WITH POWER REDUCED TO APPROX 75-80 PERCENT N1 A PUFF OF SMOKE COME FROM BOTH OF THE COCKPIT WEMACS BELOW THE GLARESHIELD FOLLOWED BY VERY STRONG SULFUR ODOR.   TROUBLESHOT DISCREPANCY TO A FAILED COCKPIT ACM. REMOVED AND REPLACED ACM IAW 750 MM CHAPTER 21-50-01 OPS CHECK GOOD.

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