Air Accidents Investigation Branch
September 12
08:57
2024
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.