On January 20, 1993, a Boeing A75N1 (registration N56924) operated by Denton, Larry E. was involved in an aviation accident near Medicine Bow, WY. Investigators recorded the probable cause as: The failure of the number 7 cylinder intake valve rocker arm, which resulted in an engine stoppage and a subsequent forced landing. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
An aircraft experienced multiple engine surges after reaching cruising altitude, resulting in a forced landing on difficult terrain during nighttime conditions due to a mechanical failure.
The pilot reported that shortly after leveling off at 14,000 feet mean sea level, the engine surged three times and then stopped. A forced landing was executed onto rocky, upsloping terrain, under dark night conditions.
Subsequent disassembly of the engine revealed that the number 7 cylinder intake valve rocker arm had failed.
The failure of the number 7 cylinder intake valve rocker arm, which resulted in an engine stoppage and a subsequent forced landing.