Casualties unknown

Helicopter rolls over after skid hooks trailer fender during hover (N9484F)

Forgan, OK, US

On April 29, 1983, a Hughes 269B (registration N9484F) was involved in an aviation accident near Forgan, OK. Investigators recorded the probable cause as: The pilot's failure to maintain adequate clearance between the helicopter skid and the trailer fender during a hover, resulting in the skid hooking the fender and causing the aircraft to roll over. 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 2026-06-10Data APIEditorial standards

A helicopter rolled over while hovering next to a transport trailer after a skid caught on the fender, causing damage during a survey operation.

What happened

The incident occurred when a helicopter sustained damage after rolling over while attempting to land near a trailer. The pilot had been conducting a survey of a property and initially landed next to a trailer that was being used to transport the aircraft.

After stopping, the pilot lifted off again and hovered directly over the trailer. During this maneuver, one of the helicopter's skids hooked onto the fender of the trailer. This contact caused the helicopter to roll over, resulting in damage to the aircraft.

The investigation

The investigation focused on the mechanical condition of the helicopter and the circumstances surrounding the rollover. Examination revealed that the primary cause of the damage was the physical interaction between the skid and the trailer fender during the hover phase.

Findings

Contributing factors included the proximity of the hover to a stationary object with protruding parts (the fender) and the limited clearance available in the area. The pilot's decision to hover directly over the trailer without ensuring adequate lateral clearance led to the skid catching the fender.

Probable cause

The pilot's failure to maintain adequate clearance between the helicopter skid and the trailer fender during a hover, resulting in the skid hooking the fender and causing the aircraft to roll over.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001214X42701. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.