Jun 8, 2020
Accident
Substantial Anchorage, AK
InjuriesNone
Phase of Flight-
ConditionsVMC
OperationFAR 091
Probable Cause
The fatigue fracture of the American Iron and Steel Institute (AISI) 1025 carbon steel rudder post, which resulted in structural failure of the rudder. Contributing to the fatigue failure was the post’s susceptibility to fatigue cracking under normal service conditions.
NTSB ANC20LA059