On July 25, 1982, a Beechcraft C-45H (registration N444Q) operated by James E. Slocum was involved in an aviation accident near Aurora, CO. Investigators recorded the probable cause as: The landing gear slide tubes, slides, and actuating chains contained an excessive accumulation of grease, dirt, and grit, and rust was found on the slide tubes, preventing gear extension. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A pilot could not extend landing gear normally or via emergency system. After attempts, he landed with gear in free-fall position. On touchdown, wheels retracted, causing substantial aircraft damage. Investigation found excessive grease, dirt, and rust on gear components.
Incident Overview
A pilot reported being unable to extend the landing gear using either the normal or emergency systems. After repeated attempts to lower the gear, he decided to land with the gear configured in a free-fall position. On final approach, he shut down and feathered both engines.
Landing and Damage
During touchdown, the wheels were forced upward from their free-fall position and into the wheel wells. Consequently, the aircraft sustained substantial damage.
Investigation Findings
An investigation revealed that the landing gear slide tubes, slides, and actuating chains contained an excessive accumulation of grease, dirt, and grit. Additionally, rust accumulation was found on the slide tubes.
Probable cause
The landing gear slide tubes, slides, and actuating chains contained an excessive accumulation of grease, dirt, and grit, and rust was found on the slide tubes, preventing gear extension.