What connects the engines to the transmission systems, driving the main and tail rotor systems?

• A. Driveshaft sections
• B. Main gearbox/Main Transmission
• C. Tail gearbox
• D. Intermediate gear box

Answer: (A)

Power from the engines is transmitted to the rotor systems through driveshaft sections. These shafts connect the engines to the main transmission, carrying torque and allowing the gear reduction and power distribution that drives the main rotor. From the main transmission, power is routed to the tail rotor via the tail gearbox, but the key link that ties the engines to the transmission systems themselves is the driveshaft. They’re designed to handle changes in alignment, engine RPM, and vibration while keeping the power flow continuous. The other components—main gearbox and tail gearbox—are parts of the transmission path, not the connectors from engines to those systems, and an intermediate gear box appears only in certain designs rather than being the universal connector.