What is the effect of a sudden increase in headwind on lift during glide?

A sudden increase in headwind during a glide increases the indicated airspeed (IAS) of the aircraft. The lift generated by an airfoil is dependent on several factors, including airspeed, the density of the air, and the wing's surface area and shape. Specifically, lift is proportional to the square of the airspeed; as the IAS increases due to the headwind, the lift generated by the wings also increases.

When the aircraft is gliding into a headwind, the relative wind experienced by the wings is intensified. This increase in the relative wind speed translates to a higher IAS, which in turn produces more lift—helping the aircraft to maintain altitude or lose altitude more slowly than it would in still air. This phenomenon is particularly important during approaches or landing phases, where controlled descent is critical.

In contrast, options that suggest a decrease in IAS, decrease in lift, or no effect on lift overlook the fundamental principles of lift generation and the direct relationship between IAS and lift under the influence of wind conditions. Understanding this interaction is crucial in maneuvering aircraft effectively and safely during various phases of flight.