# SDR DXTA200802971

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 30, 2008
- Submitted: April 21, 2008
- Operation: Air carrier
- Aircraft: [N921QS](https://openairdocs.org/aircraft/N921QS), registered now
- Make and model: Cessna 750
- Registry model: [Cessna 750](https://openairdocs.org/model/cessna-750) (OpenAirDocs)
- Aircraft serial: 7500241
- Aircraft time: 3,050 hours, 1,928 cycles
- Engine: Allsn AE3007C
- System (JASC): [2170 · Humidity Control System](https://openairdocs.org/jasc/2170)
- Part: Coalescer Bag
- Part number: 7464513
- Condition: Dirty
- Location: A/C Bay
- Part time: 3,050 hours, 1,929 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA200802971

## Discrepancy

CABIN ALTITUDE SPIKED TO 4000 FT/MIN CLIMB DURING GEAR RETRACTION.  SHORTLY THERE AFTER SMOKE ENTERED THE CABIN THEN DISSIPATED.  REPLACED BOTH COALESCER SOCKS IAW MM 12-10-01.  ACCOMPLISHED MANUAL CONTROL VALVE PLUMBING LEAK TEST, LT AND RT CABIN PRESSURE CONTROL SYSTEM STATIC LEAK TEST AND ELECTROPNEUMATIC TRANSFER VALVE PLUMBING LEAK TEST IAW MM 21-30-00.  ALL TESTS AND LEAK CHECKS ARE GOOD.

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