aerodynamicsFAA-published sample question (PAR, Aug 2021)
The term 'angle of attack' is defined as the angle between the
A
chord line of the wing and the relative wind.✓ Correct Answer
B
airplane's longitudinal axis and that of the air striking the airfoil.
C
airplane's center line and the relative wind.
Explanation
Angle of attack is the acute angle between the chord line of the wing and the direction of the relative wind (PHAK Ch. 5). It is measured from the airfoil's chord, not from the airplane's longitudinal axis or centerline. The angle between the longitudinal axis and the horizon is the pitch attitude, and the angle between the chord and the longitudinal axis is the angle of incidence.
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