An oil pump drive failure which lead to a fall in gearbox oil pressure appears to be behind the 11 May ditching of a Eurocopter EC225 (G-REDW) in the North Sea with 14 people onboard. The detail ...

As a result, the vertical shaft ceased to drive the main and backup oil pumps, leading to warning indications of the loss of the MGB main and standby oil lubrication systems.