On December 15, 1987, a Grumman AA-5A (registration N74085) operated by Dick Lee was involved in an aviation accident near Rome, NY. Investigators recorded the probable cause as: Oil flow to the #2 connecting rod was obstructed by metal particles from a spalled valve tappet face, resulting in localized oil starvation and a broken connecting rod, which led to engine failure. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
An aircraft experienced engine failure after encountering snow squalls and gusty winds while en route from Watertown to Glens Falls, New York. The pilot performed a forced landing but struck trees and flipped over. Post-accident examination revealed oil starvation due to metal particles obstructing the connecting rod oil flow.
Flight and Conditions
The flight was en route from Watertown to Glens Falls, New York, when the pilot encountered snow squalls of varying intensity and gusty wind conditions. The pilot reported that forward visibility was marginal.
Engine Failure and Forced Landing
Shortly after changing heading towards Utica, New York, the engine failed. The pilot immediately set up for a forced landing in a field. During the approach, the aircraft clipped tree tops, descended to the ground, struck left wing first, and flipped over.
Post-Accident Examination
Post-accident disassembly of the engine revealed a broken #2 connecting rod and evidence of localized oil starvation. The oil flow to the #2 connecting rod had been obstructed by metal particles originating from a spalled valve tappet face.
Probable cause
Oil flow to the #2 connecting rod was obstructed by metal particles from a spalled valve tappet face, resulting in localized oil starvation and a broken connecting rod, which led to engine failure.