Originally Posted by
Pablo332
From the underslung MRH picture post 207, it would appear that the MGB Flared housing is missing from the Lift housing of the MRH shaft. Lack of lubrication to the mast bearings may be an issue, I believe on this model there is no way of verifying oil supply as there was on the 332 post MRH replacement. But HUMS should have picked this up.
Pablo, are you referring to the upper bearing where the mast comes through the top of the housing? Unfamiliar with this aircraft, but I think I understand that there are oil jets that keep lube coming to that bearing. If the lube doesn't get there, how does a rising temperature get detected? (I think I see your point on an impending bearing failure being picked up by a HUMS sensor).