On September 14, 1982, a Cessna 182P (registration N7446N) operated by William E. Moore was involved in an aviation accident near 3/4 N.e. OF Nuc, CO. Investigators recorded the probable cause as: A fractured valve rocker boss that obstructed the intake rocker arm, causing the intake valve to remain open and resulting in insufficient engine power. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
Following minor engine maintenance, an aircraft experienced rough running and power loss shortly after takeoff. The pilot executed a forced landing in an open field where the horizontal stabilizer struck a fence.
What happened
Minor engine maintenance was performed on the aircraft prior to departure. Shortly after takeoff, the engine began running roughly and backfired. It failed to produce sufficient power to sustain flight. The pilot initiated an emergency landing in an open field. During this landing, the horizontal stabilizer struck a fence.
The investigation
The pilot reported that a valve rocker boss had fractured. A piece of the broken component became lodged under the intake rocker arm, holding the intake valve open. This mechanical failure prevented the engine from generating adequate power.
Probable cause
A fractured valve rocker boss that obstructed the intake rocker arm, causing the intake valve to remain open and resulting in insufficient engine power.
What happened in the 14 Sept 1982 Cessna 182P accident near 3/4 N.e. OF Nuc, CO?
Following minor engine maintenance, an aircraft experienced rough running and power loss shortly after takeoff. The pilot executed a forced landing in an open field where the horizontal stabilizer struck a fence.
What aircraft was involved and where did it happen?
The accident on 14 Sept 1982 involved a Cessna 182P, registration N7446N, operated by William E. Moore, at 3/4 N.e. OF Nuc, CO.
What was the probable cause of the accident?
A fractured valve rocker boss that obstructed the intake rocker arm, causing the intake valve to remain open and resulting in insufficient engine power.
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