# SDR DXTA200702322

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 7, 2007
- Submitted: July 16, 2007
- 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: 6,661 hours, 4,090 cycles
- Engine: Allsn AE3007C
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Acm
- Part number: 73838433
- Part serial: 9812081
- Condition: Failed
- Location: Aft Service Bay
- Part time: 4,722 hours, 2,915 cycles
- 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/DXTA200702322

## Discrepancy

DESCENDING TROUGH FL310 CREW HEARD A VERY LOUD POP SOUND FOLLOWED IMMEDIATELY BY A STRONG SMOKE SMELL.  NO SMOKE WAS OBSERVED, THE POP SOUND SEEMED TO COME FROM CABIN AREA.  T/S FOUND AFT (COCKPIT) ACM INOP. GAINED ACCESS TO ACM.  REMOVED ACM AND INSTALLED A REPAIRED ACM. REINSTALLED ACCESS ITEMS. OPS AND LEAK CHECK CHECKS GOOD. WORK DONE IAW MM 21-51-00.

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