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Engine Failure Due to Stuck Exhaust Valve Leads to Accident (N4581W)

Glendale, AZ, US

On July 31, 1992, a Rockwell 112TC (registration N4581W) operated by Kevin D. Nielsen was involved in an aviation accident near Glendale, AZ. Investigators recorded the probable cause as: The number one cylinder exhaust valve was stuck in the open position due to carbon buildup on the valve stem. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-07-04Data APIEditorial standards

An aircraft experienced engine roughness and backfiring during runup and takeoff. The engine failed completely while maneuvering to return, resulting in a collision with terrain and landing gear separation. Post-accident examination revealed a stuck exhaust valve due to carbon buildup.

Accident Sequence

Multiple witnesses, including A&P mechanics working at Glendale Airport, observed the accident sequence. During the pretakeoff engine runup, the engine appeared to run rough and backfire. The aircraft initiated a takeoff, and witnesses reported that the engine roughness and backfiring continued throughout the takeoff ground roll and initial climb. The aircraft was observed to maneuver to the downwind leg, as if the pilot were attempting to return for a landing. Subsequently, the engine ceased running altogether. The aircraft collided with the ground in a corn field approximately one-half mile from the end of the runway, shearing off the landing gear.

Engine Examination

Examination of the engine by an A&P mechanic under the supervision of FAA inspectors revealed that the number one cylinder exhaust valve was stuck in the open position due to carbon buildup on the valve stem.

Probable cause

The number one cylinder exhaust valve was stuck in the open position due to carbon buildup on the valve stem.

Frequently asked questions

What happened in the 31 Jul 1992 Rockwell 112TC accident near Glendale, AZ?

An aircraft experienced engine roughness and backfiring during runup and takeoff. The engine failed completely while maneuvering to return, resulting in a collision with terrain and landing gear separation. Post-accident examination revealed a stuck exhaust valve due to carbon buildup.

What aircraft was involved and where did it happen?

The accident on 31 Jul 1992 involved a Rockwell 112TC, registration N4581W, operated by Kevin D. Nielsen, at Glendale, AZ.

What was the probable cause of the accident?

The number one cylinder exhaust valve was stuck in the open position due to carbon buildup on the valve stem.

More accident analyses

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001211X15219. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.