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Accident description
Last updated: 19 October 2017
Status:
Date:Wednesday 2 December 1970
Time:ca 10:00 GMT
Type:Silhouette image of generic CL44 model; specific model in this crash may look slightly different
Canadair CL-44J
Operator:Cargolux
Registration: TF-LLG
C/n / msn: 36
First flight: 1964-03-25 (6 years 8 months)
Engines: 4 Rolls-Royce Tyne 515
Crew:Fatalities: 4 / Occupants: 4
Passengers:Fatalities: 0 / Occupants: 0
Total:Fatalities: 4 / Occupants: 4
Ground casualties:Fatalities: 3
Airplane damage: Damaged beyond repair
Location:10 km (6.3 mls) NW of Dhaka-Tejgaon Airport (DAC) (   Bangladesh)
Phase: Approach (APR)
Nature:Cargo
Departure airport:Tehran-Mehrabad Airport (THR/OIII), Iran
Destination airport:Dhaka-Tejgaon Airport (DAC/VGTJ), Bangladesh
Narrative:
The Canadair CL-44J transport plane departed Luxemburg Airport at 14:00 GMT on December 1 and flew to Hamburg in Germany were it was loaded with 27,5 tons of child food. These Swiss Red Cross supplies were to be flown to Dhaka, East-Pakistan (now Bangladesh) to help victims of floodings.
A refueling stop was made in Tehran, Iran, were it left the following day at 01:30 GMT. About 10:00 GMT, the pilot lost control of the airplane while on approach to Dhaka-Tejgaon Airport. The CL-44 crashed into farmhouses. Three persons on the ground were killed, along with the entire crew of four.
It appeared that the hydraulic gust lock system activated in flight, causing the controls to lock. It was speculated that hydraulic back pressure had built up caused by a malfunctioning switch valve when hydraulics where armed on descend.

Classification:
Locked rudders/ailerons/gustlock

Loss of control

Sources:
» CL44.com
» O.H.Jonsson


Photos

photo of Canadair CL-44J TF-LLG
TF-LLG was bought by Cargolux August 11, 1970
photo of Canadair CL-44J TF-LLG
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Map
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 Tehran-Mehrabad Airport to Dhaka-Tejgaon Airport as the crow flies is 3941 km (2463 miles).
Accident location: Global; accuracy within tens or hundreds of kilometers.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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