Casualties unknown

Helicopter Main Rotor Strikes Tree During Landing Approach (C-GLHQ)

Ambler, AK, US

On July 8, 2005, a Hughes 500D (registration C-GLHQ) operated by Prism Helicopters, Inc. was involved in an aviation accident near Ambler, AK. Investigators recorded the probable cause as: The pilot's inadvertent contact between the main rotor blades and a tree during the landing approach. 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 certified air taxi pilot was transporting passengers to a remote landing site when the helicopter's main rotor blades struck a tree during the final approach phase of flight.

What happened

The pilot, holding an airline transport certificate and operating as an air taxi carrier, was conducting a flight to deliver passengers to a remote location. The specific destination required a landing at an unprepared site. During the descent and final approach for this landing, the helicopter's main rotor system made contact with a tree located near the intended touchdown point.

Despite the impact, the aircraft remained under control and settled on the ground without any additional mishap or loss of control. There were no reports of structural damage to the airframe beyond the rotor system, and no injuries were reported among the occupants.

The investigation

Following the incident, a thorough inspection of the helicopter was conducted to assess the extent of the damage. The examination focused primarily on the main rotor assembly, which is critical for lift and control.

The inspection revealed that the main rotor blades had sustained significant damage from striking the tree. The condition of the blades was assessed as being beyond repair, necessitating their replacement before the aircraft could be returned to service.

Probable cause

The pilot's inadvertent contact between the main rotor blades and a tree during the landing approach.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20050912X01435. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.