Tail boom separation during takeoff of Hughes 369D

Casualties unknown • FR

A McDonnell Douglas Hughes 369D helicopter experienced a structural failure of the tail boom during takeoff near Saint-Etienne-les-Orgues, resulting in significant aircraft damage.

What happened

On March 22, 1997, at approximately 17:40, a McDonnell Douglas Hughes 369D helicopter, registration F-GRRJ, was conducting a private flight near Saint-Etienne-les-Orgues. About one hour into the flight, the pilot decided to interrupt the mission to consult navigational charts. During this process, the pilot performed a hard landing in a field, which involved two distinct bounces. After maintaining reduced power for several dozen seconds, the pilot attempted to take off again.

During the subsequent takeoff attempt, the tail boom separated from the aircraft. This structural failure caused the helicopter to become uncontrollable in yaw. The aircraft left the ground and subsequently rolled onto its side, resulting in heavy damage to the airframe. Weather conditions at the time were reported as calm with excellent visibility.

The investigation

Investigators examined the wreckage and the circumstances surrounding the landing prior to the accident. The investigation noted that the landing gear (skid) was found deformed. Furthermore, a witness reported observing that the tail boom appeared to be already bent prior to the final takeoff attempt. The investigation focused on the structural integrity of the tail boom following the initial hard landing.

Probable cause

The tail boom failed due to structural weakening caused by a hard landing and subsequent bounces immediately preceding the takeoff.

Frequently asked questions

What happened in the 1997-03-22 BUREAU ENQUETES-ACCIDENTS ACCIDENT survenu à l'hélicoptère accident near FR?

A McDonnell Douglas Hughes 369D helicopter experienced a structural failure of the tail boom during takeoff near Saint-Etienne-les-Orgues, resulting in significant aircraft damage.

What aircraft was involved and where did it happen?

The accident on 1997-03-22 involved a BUREAU ENQUETES-ACCIDENTS ACCIDENT survenu à l'hélicoptère, registration F-GRRJ, at FR.

What was the probable cause of the accident?

The tail boom failed due to structural weakening caused by a hard landing and subsequent bounces immediately preceding the takeoff.

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