![]() ![]() So by the time Adria flight stopped its climb, it was at flight level 330 over Zagreb, at the same time and the same level as of British Airways flight. This meant that the British Airways crew was not able to understand the conversation involving their imminent collision with the Adria flight. Realizing the imminent danger of collision, US Controller instructed Adria flight to stop climbing immediately, in doing so he reverted to his native language (not English). ![]() Also, US Controller was busy with other traffic so he did not contact Adria’s flight.Īt 10:14 Adria contacted US Controller while climbing through level 325 for level 350. Adria could not contact US Controller for a considerable amount of time due to heavy traffic or some other unknown reason. In a normal situation, Adria would have contacted US Controller, giving its position and level and the Controller would have assigned it a new squawk code. It must be known here that with help of Squawk Code it is easier for a Controller to identify an aircraft. When Adria was at 310, MS Controller advised it to contact USC and release the squawk code assigned by MSC.ĥ0 Interesting Airplane Facts You Never Knew Upon crossing of concerning aircraft, MS Controller gave climb instructions to Adria to flight level 350. US Controller saw the strip and said to the coordinator that yes, it can climb after the crossing of an aircraft (not British Airways) appearing on his screen. Then Middle Sector Coordinator came to US Controller, with the flight strip of Adria flight, and asked for its climb to level 350. ![]() MS controller asked US controller for the climb of Adria aircraft to flight level 350, but US Controller was too busy to be interrupted. Adria flight 550 was in the middle sector at flight level 260 (i.e. 33000 feet) and estimated over Zagreb at time 10:14 UTC. British Airways flight was with upper sector maintaining flight level 330 (i.e. On the day of the accident, Zagreb ATC was not having adequate manpower so all controllers were heavily work-loaded. The upper sector (US) was handling flights above 31000 feet, the middle sector (MS) responsible for flights between 25000 feet to 31000 feet, and the lower sector (LS) handled flights below 25000 feet. In those days, Zagreb ATC has three sectors named Lower, Middle, and Upper Sectors. One of the ill-fated flights, a Trident aircraft of British Airways Flight 476 was flying from London to Istanbul and another flight was Inex-Adria Aviopromet Flight 550 (a DC-9) from Split, Yugoslavia to Cologne, West Germany. In the mid-70s, Zagreb ATC Centre was one of the busiest area control centers in Europe as Zagreb was a common reporting point for traffic flying between northern Europe and South-eastern Europe, the Middle East, and Asia. Improper Co-ordination between ATC Units: Zagreb Mid-air Collision (1976) 5 Most Catastropic Crashes From Airplane Faultsġ. ![]()
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