No fatalities

Helicopter Tips Back After Landing at Remote Drilling Site

Ambler, AK, United States

On June 27, 2011, a HUGHES 500D operated by Prism Helicopters was involved in an aviation accident near Ambler, AK. No fatalities were reported. Investigators recorded the probable cause as: The pilot inadvertently placed the helicopter's skids behind the aft wooden beam during landing, causing the helicopter to tip backwards when the pilot exited. This summary draws on records from NTSB; 5 related events involving the same aircraft type or operator are linked below.

SourcesNTSBPrimary reportUpdated 2026-08-03Data APIEditorial standards

A turbine-powered helicopter tipped backwards after the pilot exited to check skid placement on wooden beams, causing tail rotor damage.

Accident Details

A pilot operating a high skid, turbine-powered helicopter landed at a remote drilling site constructed of 6-inch by 6-inch wooden beams. The landing required the pilot to align the helicopter perpendicular to the beams and set the skids directly on them. After landing, the pilot retarded the engine throttle to flight idle to initiate the mandatory 2-minute engine cool-down procedure.

Pilot's Actions

The pilot then exited the helicopter to inspect the placement of the skids on the beams. In a written statement to the National Transportation Safety Board, the pilot reported: "While waiting, I stepped out of the helicopter to look under the helicopter to verify that my bear paws were both securely placed on the supporting timber. Within a moment of stepping out, I noticed movement and watched as the helicopter tipped backwards until it came to rest on the tail rotor and stinger."

Postaccident Findings

A postaccident inspection revealed that during landing, the pilot had inadvertently positioned the helicopter's skids behind the aft wooden beam rather than directly on it. When the pilot exited, the weight shift caused the helicopter to tip backwards. The pilot stated there were no preimpact mechanical problems with the helicopter. The accident resulted in substantial damage to the tail boom, tail rotor drive system, and tail rotor gearbox.

Probable cause

The pilot inadvertently placed the helicopter's skids behind the aft wooden beam during landing, causing the helicopter to tip backwards when the pilot exited.

Contributing factors

Causes

Pilot

Other contributing factors

Contributed to outcome

Frequently asked questions

What happened in the 27 Jun 2011 HUGHES 500D accident near Ambler, AK?

A turbine-powered helicopter tipped backwards after the pilot exited to check skid placement on wooden beams, causing tail rotor damage.

Were there any fatalities in the 27 Jun 2011 HUGHES 500D accident?

No fatalities were recorded in this accident.

What aircraft was involved and where did it happen?

The accident on 27 Jun 2011 involved a HUGHES 500D, operated by Prism Helicopters, at Ambler, AK.

What was the probable cause of the accident?

The pilot inadvertently placed the helicopter's skids behind the aft wooden beam during landing, causing the helicopter to tip backwards when the pilot exited.