On June 2, 1991, an Air Tractor AT-301 (registration N8841S) operated by Inmon, Lee was involved in an aviation accident near High Springs, FL. Investigators recorded the probable cause as: The disintegration of the engine impeller due to a worn bearing, which resulted in a partial loss of power and subsequent collision with terrain. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A pilot experienced partial power loss and dumped chemical cargo before crashing into trees due to a disintegrated engine impeller caused by a worn bearing.
What happened
The pilot reported experiencing a partial loss of engine power during flight. In response to the mechanical issue, the pilot decided to dump the load of chemical cargo carried in the aircraft. Following the dump, the pilot attempted to land in an open field. However, as the landing approach continued, the loss of engine power worsened significantly. The aircraft was unable to maintain altitude and subsequently collided with trees before striking the ground.
The investigation
A mechanical examination of the engine was conducted following the accident. The inspection revealed that the engine impeller had disintegrated during operation. A mechanic who examined the engine determined that the disintegration was caused by a worn bearing within the engine assembly.
Probable cause
The disintegration of the engine impeller due to a worn bearing, which resulted in a partial loss of power and subsequent collision with terrain.