Pilot Debrief

WEATHERLY AVIATION CO INC 620B near Hettinger, ND — 2011-07-30

Final reportCEN11LA541
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Date
2011-07-30
Location
Hettinger, ND, USA
Aircraft
WEATHERLY AVIATION CO INC 620B
Registration
N90181
Category
Airplane
Highest injury
None
Fatalities
0
Phase of flight
Maneuvering

Probable cause

Internal failure of the engine for undetermined reasons.

NTSB narrative

The agricultural airplane was maneuvering at 500 feet above ground level when the engine lost power, and oil immediately covered the windscreen. During the forced landing, the airplane impacted a dirt berm and came to rest in a ditch. A postaccident examination of the engine showed a hole in the side of the No. 5 cylinder, which is located at the bottom of the engine. The examination also revealed that several of the connecting rods, including the No. 5 master rod, were broken. There was no evidence in the engine of scoring, thermal damage, or oil starvation. Due to the extent of the engine damage, the initial failure mode could not be determined. At the time of the accident, the engine had accumulated 43 hours since major overhaul.

Analysis

Primary failure mode
Engine power loss

NTSB coding

Evidence available

  • 5 docket documents
View NTSB final reportView NTSB docket

Docket documents5

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