Incident at WINNIPEG / JAMES ARMSTRONG RICHARDSON INTL MB (CYWG)

Summary

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.

Details


CADORS Number 2001C0141
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 2001-02-11 - 21:46
Day or Night? Day-time
Fatalities 0
Injuries
Aerodrome ID CYWG
Aerodrome Name WINNIPEG / JAMES ARMSTRONG RICHARDSON INTL MB (CYWG)
Geographic Location Manitoba, Canada, North America, Prairie and Northern Region, 80 NM E of Winnipeg
TSB Occurrence Number A01C0022
TSB Class of Investigation Class 5
AOR Number 13949
Reported By NAV CANADA
Categories System/component failure or malfunction [non-powerplant],Other
Events



Aircraft Details (1 aircraft)

Type Aeroplane
 Silhouette image of Aeroplane
Canadian Registration GTJX | Flightaware (Registration) | Flightaware (Tracking) | AvHerald
Foreign Registration
Country of Registration Canada
Occurrence Type Incident
Owner CALM AIR INTERNATIONAL LTD (CA
Operator CALM AIR INTERNATIONAL LTD. (1487) Commercial
Make  Silhouette image of SAAB
SAAB
Model 340B
Year Built 1989
Engine Type Turbo prop
Engine Make GENERAL ELECTRIC
Engine Model CT7-9B
Gear Type Land
Private No
Amateur Built No
Flight Number CAV 3706
Flight Rule
CARS Subpart
Phase of Flight Cruise
Damage No Damage
Fatalities 0
Injuries 0
Events Diversion,Decompression/pressurization

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