Jun 20, 2014
Accident
Substantial Lock Haven, PA
InjuriesNone
Phase of Flight-
ConditionsVMC
OperationFAR 091
Probable Cause
The airplane owner’s failure to clean and lubricate the engine valve guides and stems, which resulted in a partial loss of engine power during the initial climb due to an exhaust valve failure.
NTSB ERA14LA308