Created Wednesday, Jun 25th 2025 19:57Z, last updated Wednesday, Jun 25th 2025 19:59Z
A United Boeing 777-200, registration N78002 performing flight
UA-879 from London Heathrow,EN (UK) to Houston Intercontinental,TX (USA), was enroute at FL340 over the Atlantic Ocean about 160nm eastnortheast of Gander,NL (Canada) and had requested to climb to FL360, but was instructed to stand by.
A Fedex Boeing 777-200 freighter, registration N879FD performing flight FX-10 from Memphis,TN (USA) to Paris Charles de Gaulle (France), was enroute at FL350 in opposite direction.
Oceanic Control issued a clearance via CPDLC direct to TOPPS but inadvertently included a level change to FL360. The controller immediately recognized the error after transmitting the clearance and issued a voice instruction to maintain FL340 and disregard the CPDLC clearance, however, about two minutes
UA-879 was observed climbing. ATC instructed the crew to descend to FL340 again reiterating that the CPDLC clearance had been cancelled. The crew of
UA-879 reported a TCAS advisory and descended back to FL340 after reaching FL345.
The Canadian TSB reported separation of 1000 feet vertical was re-established within seconds and both flights continued to their destinations.
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