Narrative:An Ilyushin 18, OK-OAD, was destroyed when it crashed near Nürnberg, Germany. All 52 on board were killed.
|Date:||Tuesday 28 March 1961|
|Operator:||CSA Ceskoslovenské Aerolinie|
|C/n / msn:|| 180002102|
|First flight:|| 1960|
|Engines:|| 4 Ivchenko AI-20K|
|Crew:||Fatalities: 8 / Occupants: 8|
|Passengers:||Fatalities: 44 / Occupants: 44|
|Total:||Fatalities: 52 / Occupants: 52 |
|Airplane damage:|| Destroyed|
|Airplane fate:|| Written off (damaged beyond repair)|
|Location:||22 km (13.8 mls) NE of Nürnberg (Germany)
|Phase:|| En route (ENR)|
|Nature:||International Scheduled Passenger|
|Departure airport:||Praha-Ruzyne International Airport (PRG/LKPR), Czech Republic|
|Destination airport:||Zürich-Kloten Airport (ZRH/LSZH), Switzerland|
CSA Flight OK-511 was an international passenger flight from Prague (PRH), Czechoslovakia to Conakry (CKY), Guinea with en route stops at Zurich (ZRH), Switzerland, Rabat (RBA), Morocco, and Dakar (DKR), Senegal.
It departed Prague at 19:41 and reached the cruising altitude of 6000 m at 19:53. At 20:09 the airplane disappeared off radar screens and was found to have crashed following an in-flight structural failure.
On July 12, 1961 another CSA Il-18 operating on the same flight, OK-511, crashed near Casablanca killing all 72 on board.
PROBABLE CAUSE: "In the light of the investigations under-taken, it is probable that the accident occurred in one of the following ways, although the possibility of other causes cannot be ruled out; a) Forced descent causing the aircraft to exceed the structural stress factor in the approach manoeuvre or during the pull-out owing to: 1) The aircraft falling into an uncontrollable flight position because of a defect in an artificial horizon or an electric instrument of equal importance. In air transport flight incidents throughout the world, where unintentional steep dives have occurred, such incidents can be explained by a defect in an artificial horizon. 2) An unnoticed overcontrol of the electrical rudder or aileron trim adjustment occurring when the automatic pilot was operating with flight movements resulting therefrom after the automatic pilot was disconnected. The automatic pilot was not equipped with a trim servo-indicator to give warning of excessive trim adjustment. 3) Physical incapacity of one or both pilots. b) Intentional descent owing to the presence of smoke, fire or similar emergency, during which the structural stress factor was exceeded in the approach manoeuvre or in the pull-out."
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This map shows the airport of departure and the intended destination of the flight. The line between the airports does not
display the exact flight path.
Distance from Praha-Ruzyne International Airport to Zürich-Kloten Airport as the crow flies is 507 km (317 miles).
This information is not presented as the Flight Safety Foundation or the Aviation Safety Networks opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.