Détails:New year's day 1978. It's 20:12 when Air-India flight 855 departs Bombay Airport's runway 27 for a flight to Dubai. The Boeing 747-200, named "Emperor Ashoka", was cleared to climb to 8000 feet and report leaving 2400 feet. Approx. one minute after takeoff the plane enters a gentle right turn heading for the Arabian Sea. The Attitude Director Indicator (ADI) however remained in a right-bank indication, while the wings were already level. The captain then said: "What's happened here, my instrument...". The co-pilot didn't note the captain's concern and replied: "Mine has also toppled, look's fine." The flight engineer however noticed the difference between the captain's ADI and the third spare ADI. Because it was dark outside and the aircraft was over the Arabian Sea, there was no visual contact with the horizon. The captain continued to roll to the left because, looking at his ADI, he still thinks the plane is in a right bank. As the airplane rolled through 40 degrees left, the flight engineer indicated to the captain: "Don't go by that one, don't go by that one...". The plane however continued to roll to the left, to 108 degrees left bank. The 747 started to descend from approx. 2000 feet altitude until it crashed into shallow (10 m deep) water, 3 km offshore in an approx. 35-40deg nose down pitch.
|Date:||dimanche 1 janvier 1978|
|Numéro de série:|| 19959/124|
|Année de Fabrication:|| 1971-03-08 (6 years 10 months)|
|Moteurs:|| 4 Pratt & Whitney JT9D-7J|
|Equipage:||victimes: 23 / à bord: 23|
|Passagers:||victimes: 190 / à bord: 190|
|Total:||victimes: 213 / à bord: 213 |
|Dégats de l'appareil:|| Détruit|
|Conséquences:|| Written off (damaged beyond repair)|
|Lieu de l'accident:||3 km (1.9 milles) W de Bombay-Santacruz Airport (BOM) ( Inde)
|Phase de vol:|| En vol (ENR)|
|Nature:||Transport de Passagers Intern.|
|Aéroport de départ:||Bombay-Santacruz Airport (BOM/VABB), Inde|
|Aéroport de destination:||Dubai Airport (DXB/OMDB), Emirats Arabes Unis|
|Numéro de vol:||AI855|
PROBABLE CAUSE: The probable cause of this accident was due to the irrational control wheel inputs given by the captain following complete unawareness of the attitude of the aircraft on his part after Attitude Director Indicator (ADI) had malfunctioned. The crew failed to gain control based on the other flight instruments. He had failed to determine the attitude of the aircraft with the associated flight instruments including Standby Horizon Indicator. The co-pilot had failed to monitor the flight instruments and did not render any assistance to the captain in ascertaining the attitude of the aircraft.
» Aviation Disasters / D. Gero
» ICAO FILE NO. 78/1-0
» Jet-Airliner Unfälle seit 1952 / J. Richter, Chr. Wolf
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 Bombay-Santacruz Airport et Dubai Airport est de 1915 km (1197 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.