FAA Aircraft Dispatcher Practice Exam

What is the function of a Constant Speed Drive in an aircraft?

1. Increases thrust

2. Converts variable engine speed to a steady speed for the generator

3. Stabilizes the aircraft during flight

4. Regulates fuel flow to the engines

The correct answer is: Converts variable engine speed to a steady speed for the generator

The function of a Constant Speed Drive in an aircraft is to convert variable engine speed to a steady speed for the generator. This mechanism is essential because the engine operates at varying speeds during different phases of flight and under different conditions. However, the electrical generators need a consistent rotational speed to produce a stable frequency of electricity. By maintaining a constant output speed, the Constant Speed Drive ensures that the generator operates efficiently, providing the aircraft with a stable and reliable source of electrical power. This is crucial for powering various systems on the aircraft, such as avionics, lighting, and other essential electronic instruments. The reliability of these systems directly impacts the safety and performance of the aircraft during each flight. The other options pertain to different functions that do not relate to the purpose of a Constant Speed Drive. For instance, thrust increases involve different aerodynamic principles, stabilization involves flight control mechanisms, and fuel regulation pertains to the fuel management systems of the aircraft.