What characterizes loss shear?

Loss shear typically occurs when there is a discrepancy between the anticipated performance of an aircraft and its actual performance during flight operations, particularly in terms of speed. When actual groundspeed is less than reference groundspeed, it indicates that the aircraft is not maintaining the expected speed due to various factors, such as environmental influences or aircraft configuration changes. This difference can be critical for flight safety, as it may lead to an inability to maintain altitude or control, especially during maneuvers that require precise speed management.

Understanding this concept is crucial for pilots during their checkrides and overall flight operations. It helps them recognize and respond to situations where their aircraft isn't performing as expected, allowing for timely corrections and maintaining safety in flight operations.