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G-LOC
G-induced Loss Of Consciousness (G-LOC) incidents have caused fatal accidents in high performance aircraft capable of sustaining high g for extended periods. High-G training for pilots of high-performance aircraft or spacecraft often includes ground training for G-LOC in special centrifuges, with some profiles exposing pilots to 9 Gs for a sustained period.
Nevertheless, only a few fighter pilots have experienced G-LOC incidents. Most of them have “greyed out” (loss of all color vision), less have blacked out (you can see nothing but are still conscious and can hear and function, all be it blind).
If you G-LOC you are grounded and subjected to a physical exam, a few centrifuge rides and a dual flight before you go out single seat.
High Gs during a mock dogfight
John Chesire, former US Navy F-4 Phantom II pilot, recalls on Quora;
‘I once was involved with some air combat training off the California coast with multiple adversary aircraft from TOPGUN, Navy Fighter Weapons School and VF-126 A-4s. [It was the “many vs. only us four aircraft,” the ‘furball finale’ for the TG NFWS course. It was our last, graduation flight at the school.]
‘I was flying an F-4 Phantom when twisting my head back under a very high G-load, I apparently pinched a nerve in my neck that briefly stunned and paralyzed me.
‘It happened in a very high-G, nose-low turn. Although I was somewhat conscious, being stunned I was not in control of the aircraft. My hands were off the stick and I was limp but in pain. We were very near supersonic in a rather steep dive, and I did not have control.
Regaining control of the aircraft
‘My RIO in the back seat was screaming at me, asking frantically if I was OK! After a few seconds I regained my composure, gained control of the aircraft and told him I was, “OK” … except for the remaining sharp pain in my neck.
‘He said later if I had not immediately answered, he would have initiated automatic ejections for both of us. While that may have saved my life if I did not regain control, doing so at such a high-speed ejection would have injured us both significantly.’
Chesire concludes;
‘All’s well that ends well. My RIO and I still talk about that day long ago, and remember it vividly.’
Photo credit: U.S. Navy
