United B772 and Fedex B772 over Atlantic on Jun 21st 2025, loss of separation, TCAS advisory

Last Update: June 25, 2025 / 19:59:40 GMT/Zulu time

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Incident Facts

Date of incident
Jun 21, 2025

Classification
Incident

Airline
United

Flight number
UA-879

Departure
London Heathrow, United Kingdom

Destination
Houston Intercontinental, United States

Aircraft Registration
N78002

Aircraft Type
Boeing 777-200

ICAO Type Designator
B772

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.
Aircraft Registration Data
Registration mark
N78002
Country of Registration
United States
Date of Registration
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Manufacturer
BOEING
Aircraft Model / Type
777-224
Number of Seats
Fgg Subscribe to unlock
ICAO Aircraft Type
B772
Year of Manufacture
Eiel Subscribe to unlock
Serial Number
Lqnme Subscribe to unlock
Aircraft Address / Mode S Code (HEX)
Ibkqpf Subscribe to unlock
Engine Count
K Subscribe to unlock
Engine Manufacturer
Mk Subscribe to unlock
Engine Model
Ggbkfpec Subscribe to unlock
Engine Type
Bm qjfdqA Subscribe to unlock
Pounds of Thrust
Qeqdf Subscribe to unlock
Main Owner
DdmbpjdqgnkAfAbjk fmlAm cf gplimcqbklpckbckbpiqdjcddkhceAAmeqfnlqbAcig m Subscribe to unlock
Incident Facts

Date of incident
Jun 21, 2025

Classification
Incident

Airline
United

Flight number
UA-879

Departure
London Heathrow, United Kingdom

Destination
Houston Intercontinental, United States

Aircraft Registration
N78002

Aircraft Type
Boeing 777-200

ICAO Type Designator
B772

This article is published under license from Avherald.com. © of text by Avherald.com.
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