Détails:The Britannia aircraft approached Ljubljana runway 31 at night when it crashed into trees.
|Date:||jeudi 1 septembre 1966|
|Type/Sous-type:||Bristol 175 Britannia 102|
|Numéro de série:|| 12903|
|Année de Fabrication:|| 1954|
|Heures de vol:||18444|
|Equipage:||victimes: 6 / à bord: 7|
|Passagers:||victimes: 92 / à bord: 110|
|Total:||victimes: 98 / à bord: 117 |
|Dégats de l'appareil:|| Perte Totale|
|Conséquences:|| Written off (damaged beyond repair)|
|Lieu de l'accident:||3 km (1.9 milles) SE of Ljubljana-Brnik Airport (LJU) ( Slovénie)
|Phase de vol:|| En approche (APR)|
|Aéroport de départ:||London-Luton Airport (LTN/EGGW), Royaume Uni|
|Aéroport de destination:||Ljubljana-Brnik Airport (LJU/LJLJ), Slovénie|
|Numéro de vol:|| 105|
PROBABLE CAUSE: "The probable cause of the accident was that the pilot-in-command did not set his altimeter to the QFE-968 mb in accordance with the information passed by the controller. However, the whole approach to the airport was made as if the altimeter had been set to the QFE, and resulted in the approach being about 1250ft lower than procedural safety altitudes, so that the aircraft's approach was too low, because although it was a moonlight night he could not distinguish any visual land marks, which might have warned him of the low altitude, due to the nature of the trees covered terrain over which they were flying. As the altimeter error passed unnoticed by both pilots and because they were not carrying out cross-checks of the two altimeters in accordance with the relevant operations manual instruction attachment No. 15, the error was not corrected by climbing to a safe altitude.
This disregard of the procedure laid down in the check lists and operations manual for approach and landing may be explained by the fact that the approach was carried out on a moonlight night in calm weather and with visibility of approximately 12nm, which reduced the crew's concentration on precisely following the prescribed procedures and checks.
The visual effect of the runway slope made the situation worse, giving the pilots a wrong impression of the aircraft's approach angle. The co-pilot's altimeter was found set at 1005,5 mb. The difference between the QNH and QFE passed to the aircraft was approximately equivalent to 1000ft. A figure which might have led to further confusion."
» Flight International 19.12.1968 (1018)
» ICAO Circular 88-AN/74 Volume II (124-133)
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre London-Luton Airport et Ljubljana-Brnik Airport est de 1237 km (773 miles).
Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.