There are two FDR/CVR's in the S-92, one at the tail boom transition and one in the left avionics bay. I would like to know how the salvage crew was able to remove one of them with an ROV.
The 50 hour AD is for aircraft with -101 oil pumps installed, there are none of those in service anymore. The initial problem was that the machined surface of the pump drive spline was rougher than drawings called for. The rough surface would abrade the vespel spline adaptor, which lead to one failure. The maintenance manual now calls for the spline adaptors to be replaced 100 hours after installation of a new, repaired or overhauled pump and every 250 hours after the 100 hour replacement. There has been a new part number spline adaptor introduced in the last few weeks that is longer that the original adaptor. The adaptor was made longer due to a failure that occurred due to an adaptor not fully installed resulting in only a portion of the drive spline engaging the adaptor and caused very rapid wear.