What does the lateral axis run between in an aircraft?

The lateral axis in an aircraft is defined as the imaginary line that runs from wingtip to wingtip. This axis is crucial in understanding the movement of the aircraft, specifically for roll motion, which is the tilting of the aircraft to the left or right about this axis.

When an aircraft rolls, it pivots around this lateral axis, allowing one wing to rise while the other wing descends. This axis is perpendicular to both the longitudinal axis (which runs from nose to tail) and the vertical axis (which runs from top to bottom), making it a key reference point in aerodynamics and flight dynamics. Understanding the role of the lateral axis is essential for grasping concepts of stability and control in flight operations.