They added that the M.P (main pressure), MGB.T (main
gearbox oil temperature) and the S/B.P (standby oil pump pressure) captions on the Vehicle Management System (VMS) also illuminated and the main gearbox oil pressure indicated zero. The MGB.P (main gear box oil pressure) caption then illuminated on the CWP. The crew actioned the ‘Total Loss of MGB (Main Gear Box) Oil Pressure’ checklist, which required the activation
of the MGB emergency lubrication system (EMLUB). However, within a minute the MGB EMLUB caption illuminated on the CWP indicating that the emergency
lubrication system had failed.
It sounds almost exactly the same as the last ditching.
An initial visual examination has identified a 360 degree circumferential crack on the bevel gear vertical shaft, in the vicinity of
the weld that joins two sections of the shaft. Therefore, the main and standby oil pump gears were no longer being driven.
Oops
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