Incident at 50 NM W of Calgary, AB


1999-02-01: CDN 664, a B737, was enroute from Vancouver to Calgary and the crew was cleared to descend to FL 220 above GLR 772, a Beech 1900, which was level at FL 210 and same direction as CDN 664. At 1759Z, CDN 664 was observed 4 miles ahead of GLR 772 and descending through the assigned altitude of FL 220 without clearance. When questioned by the controller, the crew of CDN 664 acknowledged at FL 213 and commenced a climb back to FL 220. After arriving at Calgary, the pilot of CDN 664 called Edmonton ACC to explain the the a/c had some throttle problems at the time of the occurrence and the crew was going through a possible single-engine checklist scenario and they did not hear the altitude alert. OPI - Enforcement


CADORS Number 1999C0075
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 1999-01-31 - 17:59
Day or Night?
Fatalities 0
Aerodrome ID
Aerodrome Name
Geographic Location Alberta, Canada, North America, Prairie and Northern Region, 50 NM W of Calgary, AB
TSB Occurrence Number
TSB Class of Investigation
AOR Number
Reported By NAV CANADA
Categories Airprox/TCAS alert/loss of separation/(near) midair collisions

Aircraft Details (1 aircraft)

Type Aeroplane
 Silhouette image of Aeroplane
Canadian Registration
Foreign Registration
Country of Registration Canada
Occurrence Type Incident
Operator Commercial
Make  Silhouette image of BOEING
Model 737 200
Year Built
Engine Type Turbo fan
Engine Make
Engine Model
Gear Type Land
Private No
Amateur Built No
Flight Number CDN 664
Flight Rule
CARS Subpart
Phase of Flight Cruise
Damage Unknown
Fatalities 0
Injuries 0
Events Conflict - loss of separation

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