Which subsystem is driven by the main gearbox and provides mounting and drive for essential components such as hydraulic pumps, generators, rotor brake discs, etc?

• A. Driveshaft sections
• B. Tail gearbox
• C. Accessory Gearboxes/Drives
• D. Free-wheeling unit

Answer: (C)

The subsystem that provides mounting and drive for essential components like hydraulic pumps, generators, rotor brake discs, and other accessories is the accessory gearboxes/drives. Power from the main gearbox feeds an accessory drive, and this drive supplies both the mounting points and the power shafts for these critical components. This arrangement keeps important systems fed and organized from a central location, independent of the rotor drive path.

The other options don’t fit this role: driveshaft sections are the mechanical links transmitting power to the rotor, not the mounts for accessories; the tail gearbox handles the tail rotor reduction and isn’t the source for accessory components; and the free-wheeling unit allows autorotation without transmitting power to the rotor system, not supplying or mounting essential gear-driven accessories.