Sultan
Having experienced one of these myself, on a Puma, it showed up on hums 12min before landing offshore and failed 10 min after t/o from the platform, in total about 35min of increased vibrations. So if there were no indication on hums during the previous flight there would be no way of knowing that it's going to fail. Hums on the s-92 will pick this up and I'm sure it would not be dispatched if it had been there.