Incident at WINNIPEG / JAMES ARMSTRONG RICHARDSON INTL MB (CYWG)
2001-02-12: The crew of CAV 3706, a Saab 340, reported a pressurization problem eighty miles east of Winnipeg on a flight to Thunder Bay. They descended from FL 210 to 5,000 feet and returned to Winnipeg. Landed safely at 2200Z. No equipment required. TSB has been in touch with the operator.
2001-02-15: UPDATE TSB reported that the Saab 340B had departed Winnipeg on a scheduled flight for Thunder Bay. When the aircraft was at FL 210 and approximately 80 nautical miles east of Winnipeg, the crew sensed (air pressure in ears) the onset of a problem with the aircraft pressurization system. Although the bleed valves checked normal, the cabin pressure panel indicated a climb. The cabin then rapidly depressurized climbing to over 20,000 feet cabin altitude. The crew donned their oxygen masks and initiated an emergency descent as per the checklist. ATC was informed that the aircraft had depressurized and the flight would be returning to Winnipeg. After descent to below 10,000 feet, the crew ensured that the passengers were not having medical problems and supplemental oxygen was discontinued. The crew briefed ATC about the problem and advised that they did not require CFR for landing; the flight landed uneventfully. Company maintenance personnel determined that the pressurization outflow valves had frozen open. Heat was applied to thaw the valves. The aircraft was returned to service and the flight continued on its way without further problem. There were no reported injuries as a result of this occurrence.
|Occurred At||- 21:46|
|Day or Night?|
|TSB Occurrence Number|
|TSB Class of Investigation|
Aircraft Details (1 aircraft)
|Canadian Registration||| Flightaware (Registration) | Flightaware (Tracking) | AvHerald|
|Country of Registration|
|Phase of Flight|