Private Pilot Private Exam

What is the main purpose of the airspeed indicator in an aircraft?

1. To prevent engine overheating

2. To indicate the aircraft's speed relative to the air

3. To maintain proper fuel consumption

4. To assist during takeoff only

The correct answer is: To indicate the aircraft's speed relative to the air

The primary function of the airspeed indicator is to show the aircraft's speed relative to the surrounding air. This measurement is crucial for pilots because it provides essential information needed during various phases of flight, such as takeoff, cruising, and landing. For instance, knowing the indicated airspeed helps determine safe and stable flight conditions, including avoiding stalls or maintaining maneuvers. While the other choices may relate to aviation in some way, they do not accurately reflect the specific role of the airspeed indicator. Preventing engine overheating is primarily managed by monitoring engine instruments and performing maintenance, rather than by airspeed readings. Maintaining proper fuel consumption involves factors like throttle settings, engine efficiency, and flight planning, which are not directly related to the airspeed displayed. Lastly, while the airspeed indicator is critical during takeoff, its importance extends throughout the entire flight, making it essential for accurate performance management beyond just the takeoff phase.