The Helicopter Accident at Turøy: New preliminary report

On 28 June 2016 a preliminary report is published to disseminate findings from the ongoing investigation.

At this stage of the investigation, the AIBN finds that the accident most likely was a result of a fatigue fracture in one of the eight second stage planet gears. It appears that the fracture has propagated in a manner which is unlikely to become detected by existing mandatory or supplementary systems for warning of an imminent failure.

What initiated the fracture has not yet been determined.

The report is available here.