Casualties unknown

Bonanza Strikes Ground Following Helicopter on Landing Approach (N1252Z)

Delaware, OH, US

On June 3, 1992, a Beech N35 (registration N1252Z) operated by Ronald L. Montgomery was involved in an aviation accident near Delaware, OH. Investigators recorded the probable cause as: A LOSS OF CONTROL IN FLIGHT DUE TO WAKE TUBULENCE FROM A PRECEDING HELICOPTER. A FACTOR RELATED TO THE ACCIDENT WAS THE FAILURE OF THE PILOT TO RECOGINIZE THE HAZARDS OF HIS CLOSE PROXIMITY BEHIND THE LANDING HELICOPTER. 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 Bonanza airplane struck the ground with its left wing after crossing the runway threshold behind an AH-1S helicopter. The pilot reported awareness of wake turbulence but believed separation was sufficient.

Accident Overview

A Beechcraft Bonanza was involved in a ground strike incident while following an AH-1S helicopter on a landing approach. The helicopter crossed the runway threshold at approximately 200 feet above ground level and planned to touch down about 1,500 feet from the approach end of the runway.

Sequence of Events

While the helicopter was still roughly 250 feet from its intended touchdown point, the Bonanza crossed the threshold. Shortly thereafter, the Bonanza was observed to roll left and strike the ground with its left wing. The aircraft continued across a taxiway before coming to rest in an aircraft parking area.

Pilot Account

In a post-accident interview, the Bonanza pilot stated that he was aware of helicopter wake turbulence and believed there was sufficient separation between his airplane and the preceding helicopter. The helicopter involved in the sequence weighed approximately 8,400 pounds.

Investigation Details

No further information regarding injuries, damage, or environmental conditions was provided in the source. The accident investigation did not state a probable cause for the event.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001211X14955. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.