Might be something to do with upping the MTOM by 17% from the L2 to the 225 and slapping another blade on the head.
I don't buy that. How long have we been operating these superb machines on the North Sea? Seven-ish years and many thousands of hours.
If nothing got changed in the gearbox during this period, then to my tiny mind such failures must have occurred long before now.
And another thing upsets me. What on earth possessed CHC Scotia not to do MARMS downloads after every flight since the May ditching? It feels like unforgivable negligence to me. Cavalier or what!