Accident
Last updated: 20 June 2013
| Statuts: | Enquête Officielle |
| Date: | 10 SEP 1976 |
| Heure: | 10:14 |
| Type/Sous-type: | Hawker Siddeley HS-121 Trident 3B |
| Compagnie: | British Airways |
| Immatriculation: | G-AWZT |
| Numéro de série: | 2320 |
| Année de Fabrication: | 1972 |
| Heures de vol: | 8627 |
| Cycles: | 6952 |
| Moteurs: | 3 Rolls Royce 512-5W Spey |
| Equipage: | victimes: 9 / à bord: 9 |
| Passagers: | victimes: 54 / à bord: 54 |
| Total: | victimes: 63 / à bord: 63 |
| Victime de la collision: | victimes: 113 |
| Dégats de l'appareil: | Perte Totale |
| Conséquences: | Written off (damaged beyond repair) |
| Lieu de l'accident: | près de Vrbovec (Croatie)
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| Phase de vol: | En vol (ENR) |
| Nature: | Transport de Passagers Intern. |
| Aéroport de départ: | London-Heathrow Airport (LHR/EGLL), Royaume Uni |
| Istanbul-Yesilköy Airport (IST/LTBA), Turquie | |
| Numéro de vol: | 475 |
Flight BA475 (a HS-121 Trident) took from London-Heathrow at 08:32 GMT for a flight to Istanbul. About 1½ hours later, the aircraft approached the ZAG VOR beacon on airway UB5 at FL330 (10000m), heading 116° (speed 905km/h).
At the same time the Inex Adria DC-9-31 also approached the ZAG VOR, but flew airway UB9, climbing from FL260 to FL350. The DC-9 had taken off from Split at 09:48 GMT for a flight to Köln.
At 10:14:14 the DC-9 captain radioed that they were climbing through FL325. According to ATC data the Flight BA475 was approaching ZAG VOR at FL335 (FL330 actually). Zagreb ATC asked (in Serbo-Croatian) the Inex flight to maintain their present altitude. At 10:14:38 the crew of flight JP550 replied (also in Serbo-Croatian) that they where maintaining FL330.
Three seconds afterwards the outer five meters of the DC-9's left wing cut through the Trident's cockpit.
Due to the sudden decompression, the forward part of the Trident's fuselage disintegrated. The remaining part of the fuselage struck the ground tail-first and slid some 4-5m. to the left.
With it's left wing torn off, the DC-9 tumbled down and hit the ground right-wing first.
CAUSES OF THE ACCIDENT: "1) Direct cause of the accident was the struck of the DC-9 wing into the middle side of the TRIDENT THREE fuselage which occurred at the height of 33.000 feet above Zagreb VOR so that both aircraft became uncontrollable and fell on the ground.; 2) Improper ATC operation; 3) Non-compliance with regulations on continuous listening to the appropriate radio frequency of ATC and non-performance of look-out duty from the cockpits of either aircraft."
Sources:
» Air Disasters
» Aviation Week & Space Technology
» Collision course / by Tony Brkic
Official accident investigation report
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Photos
Plan
Ce plan montre l'aéroport de départ ainsi que la supposé destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre London-Heathrow Airport et Istanbul-Yesilköy Airport est de 2495 km (1560 miles).
La distance entre London-Heathrow Airport et Istanbul-Yesilköy Airport est de 2495 km (1560 miles).
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HS-121 Trident
- 11ème loss
- 117 built
- le accident 2ème le plus grave (à ce moment là)
- le accident 3ème le plus grave (en ce moment)
Croatie- le accident 2ème le plus grave (à ce moment là)
- le accident 3ème le plus grave (en ce moment)