The main rotor head is mounted on and driven by which component?

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Multiple Choice

The main rotor head is mounted on and driven by which component?

Explanation:
Power for the main rotor comes from the engine through the main gearbox to the main transmission shaft. That shaft drives the rotor mast, and the main rotor head is mounted on that mast so it turns with it. The dome and spinner are aerodynamic or structural parts, not driving components, and the tail rotor shaft powers only the tail rotor, not the main rotor. So the main transmission shaft is the component that mounts and drives the main rotor head.

Power for the main rotor comes from the engine through the main gearbox to the main transmission shaft. That shaft drives the rotor mast, and the main rotor head is mounted on that mast so it turns with it. The dome and spinner are aerodynamic or structural parts, not driving components, and the tail rotor shaft powers only the tail rotor, not the main rotor. So the main transmission shaft is the component that mounts and drives the main rotor head.

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