Incident at Gander Ocean Airspace (Conflict - loss of separation)


1997-07-22: British Airways (BAW) 178 and Air Canada (ACA) 868 were on the same track to 30 West. BAW was behind and faster. At 1830z BAW requested climb to FL 370. Gander ATC cleared aircraft to FL 330 as ACA already occupied FL 370. Clearance was relayed via Gander International Flight Service Station (IFSS). The IFSS specialist cleared the aircraft to FL330 but the aircraft readback FL370. The discrepancy was not detected by the specialist. When BAW reported level at FL370, the estimated longitudinal separation with ACA was 6 minutes (require 10 minutes). ACA cleared to FL410. TSB case closed.


CADORS Number 1995A0121
Occurrence Type Incident
Reported By
Occurred At 1995-01-19 - 18:41
Day or Night? Day-time
Fatalities 0
Injuries 0
Aerodrome ID
Aerodrome Name
Geographic Location Gander Oceanic, Atlantic Region, Gander Ocean Airspace
TSB Occurrence Number
TSB Class of Investigation
AOR Number
Reported By
Categories Airprox/TCAS alert/loss of separation/(near) midair collisions
Events Conflict - loss of separation

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