Pilot Debrief

Cessna 177RG near Marietta, OH — 2010-06-07

Final reportCEN10LA306
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Date
2010-06-07
Location
Marietta, OH, USA
Aircraft
Cessna 177RG
Registration
N2016Q
Category
Airplane
Highest injury
None
Fatalities
0
Phase of flight
Descent

Probable cause

The total loss of engine power due to the fatigue failure of the No. 2 cylinder attachment fasteners as a result of improper engine overhaul practices.

NTSB narrative

While on a cross-country flight, the airplane experienced a total loss of engine power when the No. 2 cylinder, piston, and connecting rod separated from the engine. The pilot reported that the airplane had insufficient altitude to reach the nearest airport, and a forced landing was made into an agricultural field. A postaccident metallurgical examination revealed multiple fatigue fractures of the attachment fasteners used to secure the No. 2 cylinder to the crankcase. The observed fatigue was the result of an insufficient fastener preload. The engine had accumulated 519 hours since the last major overhaul. Review of the engine logbook established that there were no maintenance actions completed to the No. 2 cylinder, piston, or connecting rod since the last overhaul. Therefore, the insufficient fastener preload was likely due to improper overhaul practices during the last engine overhaul.

Analysis

Primary failure mode
Mechanical failure
First missed decision gate
Pilot could have opted for an emergency landing sooner after engine roughness.

NTSB coding

Evidence available

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

Docket documents7

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