AAIB investigation to Fan Jet Falcon Series D, G-FRAK
Fan Jet Falcon Series D (G-FRAK), temporary control restriction whilst in-flight over south-west England, 14 November 2023
The pitch control became restricted whilst operating at FL190. A MAYDAY was declared, and the aircraft diverted to the nearest suitable airfield. During the approach, the restriction cleared with a “thud” and the aircraft landed without further incident.
Subsequent investigation determined that the restriction was caused by rainwater collecting in a compartment under the pitch control idler link and then freezing at high altitude.
To prevent a recurrence, two safety actions have been taken; a modification by the operator to reduce the possibility of rainwater ingress and a modification by the aircraft manufacturer to increase drainage of the affected compartment.
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