"it has always been a mystery to me why anyone would install a manual bypass system on a new helicopter. I believe it's about to be automated on the S-92!"
insider,
Most high power MRGB lube systems have lots of bypass valves, all of which are passive (for lack of a better term) devices. There are high and low pressure relief valves, filter element bypass valves, and cooler thermostatic bypass valves.
I don't know specifics of the S-92 lube system. Where does the manual bypass route oil from and to?
Thanks.
riff_raff