Pilot Debrief

PIPER J3C-65 near Gosport, IN — 2021-08-06

Final reportCEN21LA359
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Date
2021-08-06
Location
Gosport, IN, USA
Aircraft
PIPER J3C-65
Registration
N6269H
Category
Airplane
Highest injury
None
Fatalities
0

Probable cause

A total loss of engine power during cruise flight due to the failure of a cylinder exhaust valve stem, which led to a forced landing during which the airplane impacted terrain.

NTSB narrative

The pilot stated that, during cruise flight, the airplane experienced “significant” vibration, which was followed by a total loss of engine power. The pilot performed a forced landing to a field, during which the airplane nosed over and impacted terrain. Postaccident examination of the airplane engine revealed that the No. 4 cylinder exhaust valve stem was broken at its base and the seat was turned sideways. Pieces of the stem were found in the cylinder. The failure of the exhaust valve resulted in reduced engine compression leading to the total loss of engine power.

NTSB coding

Evidence available

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

Docket documents3

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