On 21st March 1946 Spitfire IX PT766 of 595 Sqn crashed at Bishopston after the pilot lost control whilst flying in cloud causing the a/c to dive vertically into the ground.
On 21st March 1950 Bristol 170 Freighter G-AHJJ departed on its second test flight from Filton after conversion from Mk.2A to Mk.21. Some 34 minutes after departure the aircraft entered a spin, crashing out of control at Cowbridge, killing all four on board. The accident investigation concluded that "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."
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