Final
2 minor
May 26, 2021
N75016 accident at Hollister, CA
Boeing A75N1(PT17) — Loss of engine power (partial) at 1C9 (Hollister, CA)
DateMay 26, 2021
Tail numberN75016
AircraftBoeing A75N1(PT17) · Boeing-Stearman Kaydet · ST75
Location1C9 — Hollister, CA
Phase of flightInitial Climb
OperationPart 91 Personal
Injuries2 minor
NTSB caseWPR21LA208
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.
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