Incident at GANDER INTL NL (CYQX) (Conflict - loss of separation, ATS operating irregularity)


2003-02-20: TSB - Update 2003/02/19 - A03A0025: LTU8252, an Airbus A-300 was en route from Basel, Switzerland to Puerto Plata, Dominican Republic at Fl360 routing 48N/20W at 1219 UTC, estimating 48N/30W at 1317 UTC and 45N/40W at Mach .82. MYT011, an Airbus A-330 was en route from Manchester, UK to Bridgetown, Barbados at FL380 routing 51N/20W at 1231 UTC, estimating 49N/30W at 1333 UTC and 42N/40W at Mach .81. (Crossing track with LTU8252) LTU8252 progressed 30W at 1319 UTC and at that time the crew requested a climb to FL380. The Gander oceanic controller completed a trial probe based on the estimated time of MYT011 at 30W to determine if the required separation between the two aircraft would be maintained and the probe showed that the two aircraft would have 17 minutes separation at the closest point and cleared LTU8252 to FL380. At 1334 UTC, MTY011 reported to Gander ACC that they had progressed by 30W at 1331 UTC. (Two minutes earlier than the estimate). This information was not entered into the system until 1359 UTC, by which time the two aircraft had already crossed tracks. It is estimated that the aircraft crossed tracks with 13 minutes longitudinal separation at the same altitude where 15 minutes longitudinal or 1000 feet vertical are required.
2003-02-17: An Airbus A300 (LTU8252) had a routing of 48N 20W - 48N 30W - 45N 40W at Flight level 360. Another Airbus A300 (MYT011) had a routing of 51N 20W - 49N 30W - 42N 40W at Flight Level 380. LTU8252 was cleared to Flight Level 380 with less than the required separation with MYT011. Both aircraft were Westbound within Gander ACC.


CADORS Number 2003A0104
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 2003-02-17 - 13:31
Day or Night? Day-time
Fatalities 0
Aerodrome ID CYQX
Aerodrome Name GANDER INTL NL (CYQX)
Geographic Location Gander Oceanic, Atlantic Region, Gander ACC
TSB Occurrence Number A03A0025
TSB Class of Investigation Class 5
AOR Number 27667
Reported By NAV CANADA
Categories Airprox/TCAS alert/loss of separation/(near) midair collisions,ATM/CNS
Events Conflict - loss of separation,ATS operating irregularity

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