Casualties unknown

Helicopter loses power during aerial application and crashes into cornfield (N8951F)

Coal Valley, IL, US

On July 10, 1985, a Hughes 269A1A (registration N8951F) operated by Aztec Aviation was involved in an aviation accident near Coal Valley, IL. Investigators recorded the probable cause as: The pilot's inability to maintain control of the helicopter following an unexplained loss of power during an aerial application run. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 3 related events involving the same aircraft type or operator are linked below.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-06-10Data APIEditorial standards

A helicopter suffered a sudden loss of power while conducting aerial application work, resulting in a crash into tall corn that destroyed the main rotor blades and separated the skids.

What happened

The pilot was conducting an aerial application run when he experienced a sudden loss of engine power. The incident occurred without warning, leaving the pilot with very little time to react. Following the power failure, the helicopter lost directional control. The aircraft descended rapidly and settled into a field of tall corn.

The impact with the ground and vegetation caused significant structural damage to the aircraft. The main rotor blades were completely destroyed during the crash sequence. Additionally, the tail cone was severed from the airframe, and the landing skids separated from the helicopter.

The investigation

Investigators examined the wreckage and performed a detailed analysis of the aircraft's systems to determine the cause of the power loss. They inspected the fuel system for any signs of contamination or blockage. Components of the engine were also examined closely for mechanical defects or wear.

To further verify the condition of the propulsion system, an engine run was conducted on the recovered components. This test was designed to simulate operational conditions and check for performance issues. The examination of the fuel, engine components, and the results of the engine run disclosed no failure or malfunction within the aircraft systems.

Probable cause

The pilot's inability to maintain control of the helicopter following an unexplained loss of power during an aerial application run.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001214X37037. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.