What is gain shear?

Gain shear refers to a specific aerodynamic condition where the actual groundspeed of an aircraft exceeds the reference groundspeed. This situation can occur due to several factors, such as a tailwind that increases ground speed or changes in air density and temperature that affect performance parameters.

In the context of flight operations, understanding gain shear is crucial for pilots, especially during approaches and landings. When groundspeed is higher than expected, it impacts the aircraft's landing approach and can necessitate adjustments in speed management and descent profiles to ensure a safe landing.

Understanding the nuances of gain shear helps in assessing performance and safety during various phases of flight, reinforcing the importance of maintaining awareness of real-time flight parameters compared to expected values.