Incident at In the vicinity of: CALGARY INTL AB (CYYC)
2015-04-17: TSB Update : A03W0020: A Cessna 402C, (Registered as C-FAFB) operating as FLZ712 was inbound to Calgary from the north at 8000 feet ASL on vectors. A Beechcraft King Air, E90 (Registered as C-FNCB) was also inbound to Calgary from the north in a descent to a cleared altitude of 9000 feet ASL. As C-FNCB approached 9000 feet the aircraft were separated by 3 miles on radar. C-FNCB continued in a non-cleared descent. When C-FNCB approached 8800 feet the controller questioned them about their altitude and gave them an altimeter check. The pilot acknowledged the clearance and continued in the descent below the cleared altitude. A loss of separation occurred when C-FNCB descended below 9000 ASL. The controller attempted to stop the descent and issued vectors in order to regain separation. The aircraft came within 1.28 miles and 300 feet vertically of each other. In this area, either 1000 feet vertical or 3 miles separation is required. Separation was regained when 3 miles radar separation was achieved, about 2 ½ minutes after the loss of separation occurred.
2003-02-03: ALZ 712, a Cessna 402, was inbound to Calgary from the north, level at 8,000 feet and on a vector. C-FNCB, a Beech King Air, was also inbound to Calgary from the north, was in descent cleared to 9,000 feet. When C-FNCB approached 9,000 feet, the two aircraft were separated by 3 miles radar. The crew of C-FNCB did not stop at their cleared altitude; instead they continued the descent. As they descended past 8,800 feet, the Controller questioned the crew about their altitude and gave them an altimeter check. The pilot acknowledged the clearance and continued to descend below the cleared altitude. The Controller then tried to halt the descent of C-FNCB and issued vectors and traffic information to both aircraft in an attempt to regain separation. A loss of separation occurred when C-FNCB descended below their cleared altitude of 9,000 feet. The aircraft came within 1.28 miles and 300 feet vertical from each other in an area that required either 1,000 feet vertical or 3 miles separation. Separation was regained when 3 miles radar separation was achieved about 2 1/2 minutes after the initial loss of separation.
|Occurred At||- 03:09|
|Day or Night?|
|TSB Occurrence Number|
|TSB Class of Investigation|
Aircraft Details (2 aircraft)
|Canadian Registration||| Flightaware (Registration) | Flightaware (Tracking) | AvHerald||| Flightaware (Registration) | Flightaware (Tracking) | AvHerald|
|Country of Registration|
|Phase of Flight|