May 26, 2021
Accident
Substantial Hollister, CA
Injuries2 minor
Phase of Flight-
ConditionsVMC
OperationFAR 091
Probable Cause
The improper installation of a relief valve spring that was shorter than the standard spring length, which slowed the response of the propeller governor to change the pitch of the blades during climbout, resulting in a partial loss of power.
NTSB WPR21LA208