Dynamic Rollover Leads to Destruction of Bell 206L-3 in Westendorf

Casualties unknown • Westendorf, DE

A Bell 206L-3 helicopter crashed during a corporate anniversary sightseeing flight in Westendorf, Germany, resulting in one serious injury and two minor injuries.

What happened

On July 26, 2008, a Bell 206L-3 helicopter was conducting sightseeing flights for a corporate anniversary at an industrial site in Westendorf, Germany. The aircraft was performing its fifth flight of the day, carrying seven occupants, including two pilots.

At approximately 14:47 local time, the helicopter lifted off from a turnaround area surrounded by harvested grain fields. During the takeoff, the aircraft rotated 180 degrees to the left while still in a low hover. As the crew transitioned from a stationary hover to forward flight, the aircraft experienced a loss of lift. Due to a pre-existing left lateral tilt and the low altitude of the hover, the front of the left skid made contact with the ground. This contact triggered a dynamic rollover, causing the helicopter to capsize onto its right side. The tail boom separated from the fuselage, and the rotor head was torn from the mast. All seven occupants were able to exit the wreckage on their own; however, one person sustained serious injuries and two others sustained minor injuries. The aircraft was destroyed.

The investigation

The BFU examined the wreckage and analyzed video footage of the accident and preceding flights. The investigation confirmed that the aircraft was properly maintained, with its last annual inspection completed in February 2008. The takeoff weight and center of gravity were found to be within permissible limits, and no technical malfunctions were identified in the flight controls or engine systems. The investigation also reviewed meteorological data, noting visibility of over 10 km and a light wind from 100 degrees.

Findings

  • The primary cause of the accident was a pilot error during the transition from hover to forward flight.
  • The pilot failed to provide sufficient power to compensate for the loss of lift during the transition from ground effect to forward flight.
  • The presence of a left crosswind, combined with the lateral thrust from the tail rotor, required the pilot to maintain a left bank to prevent drifting right.
  • The low altitude maintained during the initial hover and the rapid nature of the takeoff procedure contributed to the skid making ground contact.

Probable cause

The accident was caused by a pilot error during the transition from a stationary hover to forward flight, where the failure to increase power, combined with a left-side bank to counteract wind and tail rotor thrust, led to a dynamic rollover.

Frequently asked questions

What happened in the 2008-07-26 Bell Helicopter Textron Canada accident near Westendorf, DE?

A Bell 206L-3 helicopter crashed during a corporate anniversary sightseeing flight in Westendorf, Germany, resulting in one serious injury and two minor injuries.

What aircraft was involved and where did it happen?

The accident on 2008-07-26 involved a Bell Helicopter Textron Canada, at Westendorf, DE.

What was the probable cause of the accident?

The accident was caused by a pilot error during the transition from a stationary hover to forward flight, where the failure to increase power, combined with a left-side bank to counteract wind and tail rotor thrust, led to a dynamic rollover.

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