A343 / B744, en-route, south of Newfoundland Canada, 1998

Summary: 

On 20 July 1998, after an ATC error south of Newfoundland, an Air France A340 and an Air Canada 747-400 were on directly converging tracks and at the same level. Collision was avoided by the correct actioning of coordinated TCAS RAs by both aircraft.

Event Details
When: 
20/07/1998
Event Type: 
Day/Night: 
Night
Flight Conditions: 
IMC

18870

Flight Details
Aircraft: 
Operator: 
Type of Flight: 
Public Transport (Passenger)
Flight Origin: 
Intended Destination: 
Take-off Commenced: 
Yes
Flight Airborne: 
Yes
Flight Completed: 
Yes
Phase of Flight: 
Cruise

18871

Flight Details
Operator: 
Type of Flight: 
Public Transport (Passenger)
Intended Destination: 
Take-off Commenced: 
Yes
Flight Airborne: 
No
Flight Completed: 
No
Phase of Flight: 
Cruise
Location
General
Tag(s): 
Aircraft-aircraft near miss
HF
Tag(s): 
ATC clearance error, Ineffective Monitoring, Procedural non compliance
LOS
Tag(s): 
Required Separation not maintained, ATC Error, Near Miss
EPR
Tag(s): 
PAN declaration
Outcome
Damage or injury: 
No
Non-aircraft damage: 
No
Non-occupant Casualties: 
No
Off Airport Landing: 
No
Ditching: 
No
Causal Factor Group(s)
Group(s): 
Air Traffic Management
Safety Recommendation(s)
Group(s): 
None Made
Investigation Type
Type: 
Independent

Description

On 20 July 1998, after an ATC error south of Newfoundland, an Air France A340 Family and an Air Canada 747-400 were on directly converging tracks and at the same level. Collision was avoided by the correct actioning of coordinated Airborne Collision Avoidance System (ACAS) RAs by both aircraft.

Synopsis

The following is extracted from the synopsis of the official Transport Safety Board (Canada)Report:

"Air France flight 033 (AFR033), an Airbus A340 aircraft, was en route from Houston, Texas, USA, to Paris, France, at flight level FL370 with a routing of WHALE, BANCS, and latitude 46N longitude 50W (Oceanic Track "X"). Air Canada flight 870 (ACA870), a Boeing B747 aircraft, was en route from Montreal, Quebec, to Paris at FL370 with a routing of MILLS, COLOR, and latitude 47N longitude 50W (Oceanic Track "W"). ACA870 was re-cleared from MILLS direct to latitude 45N longitude 50W (Oceanic Track "Y"). The new routing placed ACA870 on a converging track with AFR033. Approximately 30 miles west of the BANCS intersection, both aircraft received and responded to traffic avoidance and collision advisory system (TCAS) resolution advisories (RA). A loss of separation occurred at approximately 0213 Coordinated Universal Time (UTC) when the two aircraft closed to approximately 400 ft vertically and 1.9 nm horizontally. The required separation in the airspace for these aircraft is 5 nm horizontally or 1000 ft vertically."

Loss of Separation near BANCS

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