Intermediate Gearbox. This gearbox at the base of the rotary rudder pylon contains a bevel gear direct-drive system to change the direction of the shafting that transmits engine torque to the tail gearbox. The intermediate gearbox is splashlubricated. Screened intermediate gearbox cooling air inlets in the pylon fairing permit the gearbox to be cooled by the rotary wing downwash.

Both the intermediate and the tail gearboxes are splash-lubricated from individual sump systems. Internal spiral channels ensure oil lubrication to all bearings. An oil filter plug, drain plug, and oil level window are in each gearbox casting. Oil capacity for the intermediate gearbox is about 0.2 gallon.