Incident at Stephenville, 60 NM south.


1997-01-21: A Boeing 767, N338AA operating as AAL106 was eastbound at FL370, routing ALEX direct to Gander. The Boeing 747, C-GAGA operating as ACA871 was westbound at FL370. routing St. John's direct MIILS. The Gander high level domestic controller was aware of the crossing tracks. His attention was temporarily diverted from the monitor while performing other tasks when the required separation was compromised. As the controller contacted AAL106 to give him a climb clearance to FL410 which was his requested oceanic altitude, AAL106 had a TCAS advisory. ACA871 also had a TCAS advisory and descended to FL364 as AAL106 passed to the North. The controller then advised ACA871 of traffic at FL350 and ACA871 returned to FL370. The required separation of 5 miles lateral had been reduced to 4 miles. Nav Canada will be investigating. TSB closed.


CADORS Number 1997A0025
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 1997-01-19 - 16:40
Day or Night?
Fatalities 0
Aerodrome ID
Aerodrome Name
Geographic Location Newfoundland and Labrador, Canada, North America, Atlantic Region, Stephenville, 60 NM south.
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 GAGA | Flightaware (Registration) | Flightaware (Tracking) | AvHerald
Foreign Registration
Country of Registration Canada
Occurrence Type Incident
Operator Commercial
Make  Silhouette image of BOEING
Model 747 233B
Year Built 1974
Engine Type Turbo fan
Engine Make
Engine Model
Gear Type Land
Private No
Amateur Built No
Flight Number ACA871
Flight Rule
CARS Subpart
Phase of Flight Cruise
Damage Unknown
Fatalities 0
Injuries 0
Events Conflict - loss of separation,TCAS alert

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