Narrative:Bristol 170 Freighter 21 had just been converted from Mk. 2A to Mk. 21 and was on its second test flight for the Certificate of Airworthiness renewal. Some 34 minutes past departure the aircraft entered a spin, crashing out of control.
PROBABLE CAUSE: "The accident is a result of a structural failure of the fuselage stern frame to which the fin is attached and must be attributed to the application on the fin and rudder of a load greater than the design ultimate load. Calculations suggest that the cause of this overloading was excessive rudder movement at a speed greater than 120 knots EAS."
Loss of control
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 Filton Airport to Filton Airport as the crow flies is 0 km (0 miles).
This information is not presented as the Flight Safety Foundation or the Aviation Safety Networkĺs opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.