From the report:
"Main Gearbox history: The main gearbox (MGB) was received from Airbus Helicopters after modification, inspection and repair before it was installed in LN-OJF 15 January 2016. At the time of installation, the MGB had accumulated 1 080 hrs since new. At the time of the accident, it had accumulated approximately 1 340 hrs since new."
"Examinations of these parts show that one of the fracture surfaces can be described as being close to 100% fatigue."
" It is considered unlikely that this fatigue crack propagated as a consequence of a structural break-up of another component."
"Even though some differences are observed when comparing the LN-OJF accident with the G-REDL accident, the fatigue fractured planet gears, however, show clear similarities."
"The AIBN is aware that the gearbox was involved in a road accident in 2015. The gearbox was inspected, repaired and released for flight by the manufacturer before it was installed in LN-OJF in January 2016. Whether there is a link between this event and the initiation and growth of a fatigue fracture, is being investigated."
"AIBN will also look into the follow-up of safety recommendations issued after the Super Puma accident in Scotland in 2009 (https://www.gov.uk/aaib-reports/2-2011-aerospatiale-eurocopteras332-l2-super-puma-g-redl-1-april-2009)."
The last statement is very interesting. Does anyone know if all the safety recommendations have been satisfactory actioned and closed? To my knowledge, they did not change the design, and the monitoring systems have remained the same after the 2009 accident.