The airplane axes are imaginary lines around which the airplane is free to rotate or move around. The three axes intersects at the center of gravity and each one is perpendicular to the other two.
Longitudinal Axis: The imaginary line that extends lengthwise through the fuselage,from nose to tail is the longitudinal axis. Motion about the longitudinal axis is roll(lateral stability).
Lateral Axis: The imaginary line that extends crosswise,wing tip to wing tip,is the lateral axis. Motion about the lateral axis is pitch (longitudinal stability)
Vertical Axis: The imaginary line,which passes vertically through the center of gravity,is the vertical axis. Motion about the vertical axis is Yaw (vertical or directional stability)
An aircraft is in state of equilibrium condition if all the force acting opposite direction cancels each other exactly. Equilibrium simple means that the existing state of affairs remains unchanged ,that there is no pitching ,yawing,rolling or any change of velocity.
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