Definition

1. Noun:
   • A hinged flight control surface on the trailing edge of an aircraft wing: An aileron is a movable flap, typically one of a pair, located near the wingtip. Its primary function is to control the aircraft's roll or lateral motion (rotation around the longitudinal axis) by moving differentially—one up and the other down.

Usage Examples

• Noun:
  • The pilot adjusted the ailerons to bank the plane into a turn.
  • A malfunction in the left aileron made the aircraft difficult to control.

Advanced Usage

• Technical Context: In aerodynamics, ailerons work by changing the lift distribution across the wings. Raising an aileron decreases lift on that wing, while lowering it increases lift, causing the aircraft to roll.
  • Crosswind landings require careful use of aileron and rudder inputs.

Variants and Related Words

• Flap (n): A hinged surface on the wing's trailing edge used to increase lift and drag, especially during takeoff and landing. (Note: Flaps are distinct from ailerons, though both are control surfaces.)
• Elevator (n): A movable control surface on the horizontal stabilizer that controls pitch (nose-up/nose-down motion).
• Rudder (n): A movable control surface on the vertical stabilizer that controls yaw (side-to-side motion of the nose).

Synonyms

• Control surface: A broader term for any movable airfoil designed to change an aircraft's attitude or direction.
• Wing flap (in a general, non-technical context, though technically imprecise).

Related Phrases (Technical Terminology)

• Aileron roll: A maneuver where an aircraft performs a complete 360-degree rotation around its longitudinal axis using primarily the ailerons.
  • The pilot executed a perfect aileron roll.
• Aileron deflection: The angle or degree to which an aileron is moved from its neutral position.
  • The amount of aileron deflection determines the rate of roll.

Noun

1. an airfoil that controls lateral motion