Investigation of helicopter accident at Turøy near Bergen in Hordaland county, Norway


29 April 2016 the Main Rotor Head (MRH) and mast suddenly detached from an Airbus Helicopters H225 enroute from Gullfaks B to Bergen Airport Flesland. The helicopter impacted on a small island east of Turøy. All 13 people on board perished.

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.

Preliminary report 28 June 2016.

Latest update: 28.06.2016



Previously published information

01.06.2016: The Helicopter Accident: New preliminary report

27.05.2016: The Helicopter Accident: Information to the public about components found in the area

27.05.2016: The Helicopter Accident: Updated preliminary report

13.05.2016: The Helicopter Accident: Preliminary report

06.05.2016: The Helicopter Accident: The search for components is resumed

02.05.2016: The Helicopter Accident: Invitation to Press Conference at Haakonsvern naval base in Bergen Tuesday 3 May at 1400 hours

02.05.2016: The Helicopter Accident: Data from the combined FDR and CVR retrieved. Data is of good quality.

01.05.2016: The Helicopter Accident: The work continues


Preliminary report

Turøy, Hordaland county, Norway
Occurrence date
ICAO Location indicator
Øvrige helikoptre
Meteorological conditions
Type of occurrence
Type of operation
Category of operation
Heavy, helicopter (> 2 250kg)
Aircraft category
Helicopter, Multi-engine, Turboprop/turboshaft
ENSV (Stavanger ATCC)
Skriv ut
Reports same aircraft model
Reports same category of operation