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
| Status: | |
| Date: | Tuesday 21 March 1950 |
| Type: |  Bristol 170 Freighter 21 |
| Operator: | Bristol Aeroplane Company |
| Registration: | G-AHJJ |
| MSN: | 12742 |
| First flight: | 1946 |
| Crew: | Fatalities: 1 / Occupants: 1 |
| Passengers: | Fatalities: 3 / Occupants: 3 |
| Total: | Fatalities: 4 / Occupants: 4 |
| Aircraft damage: | Damaged beyond repair |
| Location: | near Cowbridge ( United Kingdom)
|
| Phase: | Maneuvering (MNV) |
| Nature: | Test |
| Departure airport: | Filton Airport (FZO/EGTG), United Kingdom |
| Filton Airport (FZO/EGTG), United Kingdom |
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:
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."
Classification:
Tail failure Loss of control
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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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