Castor angle is defined as the angle A. Formed by the longitudinal axis of the aircraft and the direction of movement of the nose gear B. Between the direction of wind and the longitudinal axis of the runway C. Between the true speed of the aircraft and the crosswind component D. Between the horizontal and the fuselage axis

Formed by the longitudinal axis of the aircraft and the direction of movement of the nose gear
Between the direction of wind and the longitudinal axis of the runway
Between the true speed of the aircraft and the crosswind component
Between the horizontal and the fuselage axis

The correct answer is: A. Formed by the longitudinal axis of the aircraft and the direction of movement of the nose gear.

Castor angle is the angle between the longitudinal axis of the aircraft and the direction of movement of the nose gear. It is used to maintain directional stability during taxiing and takeoff.

Option B is the definition of the windward drift angle.

Option C is the definition of the crosswind component.

Option D is the definition of the dihedral angle.