On 29 April 2016, the Super Puma H225 was involved in a fatal accident off the coast of Norway, in which tragically all 13 people on board lost their lives. All H225 and AS332 L2 helicopters in the Super Puma fleet were subsequently grounded.
On 7 October 2016, the European Aviation Safety Agency (EASA) lifted the temporary flight suspension by issuing an airworthiness directive approving a set of protective measures to safely return the aircraft to service. The UK and Norwegian authorities have, however, continued to ground H225 and AS332 L2 helicopters.
The Accident Investigation Board Norway (AIBN) has now published their interim report into the causes of the accident. This has identified a fatigue fracture in one of the planet gears in the second stage of the epicyclic module of the main gear box (MGB) as the event that led to main rotor separation. While the failure sequence is now understood, the AIBN investigation, with the full cooperation of Airbus Helicopters, is ongoing.