Pilot Debrief

DEHAVILLAND DHC-2T near Petersville, AK — 2024-07-13

Final reportANC24LA064
Sign in to save
Date
2024-07-13
Location
Petersville, AK, USA
Aircraft
DEHAVILLAND DHC-2T
Registration
N535KT
Category
Airplane
Highest injury
None
Fatalities
0

Probable cause

An in-flight loss of thrust due to an uncommanded feathering of the propeller for reasons that could not be determined.

NTSB narrative

The pilot was conducting an air tour flight when the airplane’s propeller rpm decreased and the propeller subsequently stopped producing noticeable thrust. The pilot cycled the propeller but the propeller rpm continued to decrease.. The pilot performed a forced landing, which resulted in substantial damage to the fuselage and wings. The pilot reported no mechanical issues with the airplane other than the loss of propeller pitch control and subsequent loss of thrust. Postaccident examination and testing of the propeller and overspeed governors revealed that they performed within their respective manufacturer’s specifications, and no abnormalities were observed that would have prevented normal operation. The engine was completely disassembled and all damage noted was consistent with impact. The cause of the propeller rpm becoming uncontrollable could not be determined.

NTSB coding

Evidence available

  • Photos
  • 9 docket documents
View NTSB final reportView NTSB docket

Docket documents9

Related mishaps