Commercial Pilot License (CPL) Practice Exam

The primary function of flaps on an aircraft is to increase lift and drag while allowing for slower airspeeds. When flaps are extended, they alter the shape of the wing, which enhances the lift produced at lower speeds, particularly during takeoff and landing phases of flight. This increased lift enables the aircraft to become airborne at a lower speed, which is crucial for maintaining safety and performance during critical phases of flight.

Additionally, while the use of flaps does indeed increase drag, this characteristic can be beneficial for controlled descents and landings, allowing the pilot to manage approach angles and speeds more effectively. The combination of increased lift and drag helps pilots operate the aircraft more safely and efficiently under various conditions.

Other options do not accurately capture the primary function of flaps. For instance, flaps do not solely decrease airspeed, nor are they specifically designed to improve fuel efficiency or stabilize the aircraft. Their main purpose is centered around enhancing lift and drag, thereby providing greater control during low-speed operations.