Incident at 56/00N 050/00W (ATS operating irregularity)


1996-11-12: The Boeing 777 was at FL390 on track "W". At 0258 z the pilot reported that due to a wing Anti-Ice Unit failure he would not be able to use ETOPS alternate airports. He advised that he was now at FL380 and turned left to divert to Dulles. Gander ACC was unable to issue a descent due to lower altitude traffic so UAL914 proceeded 30 miles north of track and descended to FL290 without clearance. At FL290 Gander ACC issued a clearance to Dulles. During the descent UAL914 conflicted with the following traffic: FIN104 @ FL370, BAW216 @ FL350, NWA50 @ FL330 and COA34 @ FL310. UAL914 did not declare an emergency and no assistance was required. TSB closed.


CADORS Number 1996A0859
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 1996-11-12 - 02:58
Day or Night?
Fatalities 0
Aerodrome ID
Aerodrome Name
Geographic Location Canada, Gander Oceanic, Atlantic Region, 56/00N 050/00W
TSB Occurrence Number
TSB Class of Investigation
AOR Number
Reported By NAV CANADA
Categories Airprox/TCAS alert/loss of separation/(near) midair collisions,ATM/CNS
Events ATS operating irregularity

Aircraft Details (1 aircraft)

Type Aeroplane
 Silhouette image of Aeroplane
Canadian Registration
Foreign Registration
Country of Registration Canada
Occurrence Type Incident
Operator UNITED AIR LINES, INC. (422) Commercial
Make  Silhouette image of BOEING
Model 777 200
Year Built
Engine Type
Engine Make
Engine Model
Gear Type Land
Private No
Amateur Built No
Flight Number
Flight Rule
CARS Subpart
Phase of Flight Cruise
Damage Unknown
Fatalities 0
Injuries 0
Events Conflict - loss of separation

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