Incident at Yorkton, Saskatchewan


1996-12-10: Air Canada (ACA268), a DC9, enroute Vancouver to Winnipeg experienced pressurization problems approximately 50 NM north of Yorkton deviating around weather. The flight made a rapid descent from flight level 350 to flight level 240, then levelled off and continued to Winnipeg. The aircraft landed safely at 0418Z. UPDATE: Company maintenance inspection found the pneumatic and air conditioning systems to be operating normally; however, a minor clearance anomaly (occasionally binding) with the pressurization outflow butterfly valve was rectified by shimming the butterfly valve. Recent occurrences of DC9 pressurization problems while deviating around convective weather have prompted the airline to conduct a technical review of the circumstances.


CADORS Number 1996C0339
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 1996-08-19 - 03:35
Day or Night?
Fatalities 0
Aerodrome ID
Aerodrome Name
Geographic Location Saskatchewan, Canada, North America, Prairie and Northern Region, Yorkton, Saskatchewan
TSB Occurrence Number
TSB Class of Investigation
AOR Number
Reported By NAV CANADA
Categories System/component failure or malfunction [non-powerplant]

Aircraft Details (1 aircraft)

Type Aeroplane
 Silhouette image of Aeroplane
Canadian Registration FTMK | Flightaware (Registration) | Flightaware (Tracking) | AvHerald
Foreign Registration
Country of Registration Canada
Occurrence Type Incident
Operator Commercial
Make  Silhouette image of DOUGLAS
Model DC9 32
Year Built 1968
Engine Type Turbo jet
Engine Make
Engine Model
Gear Type
Private No
Amateur Built No
Flight Number ACA268
Flight Rule
CARS Subpart
Phase of Flight Cruise
Damage Unknown
Fatalities 0
Injuries 0
Events Decompression/pressurization

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