AAIB investigation to Reims Cessna F406, G-FIND
Incapacitation of a task specialist during unpressurised survey flight, near St Neots, Cambridgeshire, 4 April 2021.
Summary:
During an unpressurised aerial photography flight at 12,000 ft the task specialist lost consciousness. The pilot commenced a rapid descent and diverted to London Luton (Luton) Airport. During the descent the task specialist regained consciousness. The aircraft landed normally.
The pilot was using supplementary oxygen during the flight whereas the task specialist was not. It could not be determined what caused the loss of consciousness.
Following the incident, the operator took safety action to require task specialists and survey operators to use supplementary oxygen for all unpressurised flights above 10,000 ft.
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