# SDR DXTA2026040707520

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 3, 2026
- Submitted: April 14, 2026
- Operation: Air carrier
- Aircraft: [N216QS](https://openairdocs.org/aircraft/N216QS), registered now
- Make and model: Cndair CL6002B16
- Aircraft serial: 6077
- Aircraft time: 8,594 hours, 4,793 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Cabin Pressure
- Condition: Malfunctioned
- 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/DXTA2026040707520

## Discrepancy

ON DEPARTURE, OUR AIRPLANE WAS NOT PRESSURIZING. WE CONTINUED TO CLIMB, AND AT ABOUT 3500 FEET. THE AIRPLANE STARTED TO RAPIDLY PRESSURIZE. WHEN IT HIT A NEGATIVE ALTITUDE, I SELECTED MANUAL, WITH THE RATE KNOB AT ZERO, AND THEN IT GOT VERY HOT IN THE COCKPIT, AND LIGHT SMOKE IN THE CABIN, AND THE AIRPLANE CONTINUED TO OVER PRESSURIZE. TWO THINGS WERE NOTED BEFORE I SELECTED MANUAL, THE PRESS CONT BUTTON HAD "FAIL" ILLUMINATED AND THE FAULT  LIGHT WAS ILLUMINATED. TO STOP THE AIRPLANE FROM OVER PRESSURIZING, (NOW AT -2000 FEET CABIN ALTITUDE AND STILL COMING DOWN AT ROUGHLY 3-4000' A MINUTE). I TURNED BOTH PACKS OFF AND PRESSED THE DEPRESS BUTTON. NOW SITTING  HERE ON THE GROUND, IF DEPRESS IS DESELECT SELECTED, AND THE PACKS ARE TURNED ON THE AIRPLANE WILL PRESSURIZE ON THE GROUND. THE CONTROL FAULT LIGHT IS STILL ILLUMINATED, AND THE FAIL LIGHT IN THE PRESS CON BUTTON IS STILL SHOWING. AND WITH IT SELECTED IN AUTO, WE HAVE AN AUTO PRESS, AMBER CAS   GAINED ACCESS TO AIRCRAFT. REMOVED PANEL 131AL AND INSPECTED CPC/CPAM WITH NO DEFECTS. PERFORMED SELF TEST OF CPC WITH NO DEFECTS OF FAULT LT, SELF TEST OPS CHECK GOOD, PRESSURIZED AIRCRAFT IN MANUAL MODE WITH NO DEFECTS NOTED.   PERFORMED A MDC DOWNLOAD & SENT TO MCC. MAINTENANCE PERFORMED 21-00-00 AND SMARTFIX AMBER AUTO PRESS 21-31-00.   REMOVED COPILOT SIDE PANEL TO ACCESS COCKPIT FAN/SENSOR UNIT.  REMOVED SCAT TUBE FROM UNIT AND VACCUMED HOSE, CLEANED, CLEANED CONNECTOR.  REINSTALLED HOSE AND CONNCTOR. REINSTALLED COPILOT€™S SIDE PANEL.  PERFORMED OPERATIONAL CHECK OF THE TEMPERATURE CONTROL AND INDICATION SYSTEM.  COCKPIT TEMP WAS ABLE TO BE CONTROLLED FRO COLD TO HOT.  OPS CHECK GOOD.  PERFORMED IAW BOMBARDIER AMM CH 21-61-19-000-801 AND 21-61-00-710-801.  OSD: 4/7/2026

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