It is quite stunning for this non-technically qualified pilot to hear that the design of both the S92 and the 225 used single pathways for the activation of both main and back-up oil pumps that serve the single most important component in the drive train - the Main Transmission Gearbox. Tell me I have it wrong somebody - please.
Geoff, the S92 oil pumps are individually driven off the main bevel gear, so there is no single pathway. The two pumps feed the transmission "in parallel", so there isn't a main and back-up as such.