Air Accidents Investigation Branch
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The front cockpit canopy detached from the aircraft during the climb, shortly after takeoff from London Biggin Hill Airport. The aircraft returned to the airport and landed safely. Neither occupant was injured and the aircraft did not sustain any additional damage, but the canopy was not recovered.
The pilot commented that low time on type and distraction during pre-flight preparations contributed to not closing the cockpit side door prior to takeoff. This meant that when the canopy was closed prior to departure it did not latch properly.