What is the primary purpose of the Anti-G straining maneuver (AGSM)?

The primary purpose of the Anti-G straining maneuver (AGSM) is to counteract the effects of high g-forces on the body. When an aircraft experiences high g-forces, such as during tight turns, climbs, or rapid descents, these forces can cause blood to pool in the lower extremities, leading to a reduction in blood flow to the brain. This can result in G-induced Loss Of Consciousness (GLOC) or other physiological effects such as tunnel vision or greyout.

The AGSM involves a specific technique of tensing the muscles in the legs and abdomen, while also employing controlled breathing techniques. By doing this, the pilot can help maintain blood flow to the brain and minimize the adverse physiological effects experienced during high g maneuvers. This is crucial for maintaining situational awareness and operational capability in high-performance aircraft. The AGSM demonstrates the body's adaptation to counteract the challenges presented by high acceleration forces, making it an essential skill for pilots flying in environments that frequently encounter high g-loads.