The crew had a right to expect (even if they didn't understand FAR29) a gearbox that could run for 30 minutes after any credible type of oil loss because that is the requirement in the latest FARs which Sikorsky were happy to trumpet they complied with.
But that is not what the RFM or ECL says.
Bucket Speed, Min Power call it what you like, with GB problems wouldn't (shouldn't) you fly using the lowest amount of power possible?
P
(Treetoupow)