G Incapacitation in Aerobatic Pilots: A Flight Hazard
FEDERAL AVIATION ADMINISTRATION WASHINGTON DC OFFICE OF AVIATION MEDICINE
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This report presents some historical perspectives of aerobatics and the physiological effects of G acceleration, especially as pertain to in-flight loss of consciousness LOC by the pilot. Several accidents and incidents are reviewed to illustrate that LOC occurs in some pilots during aerobatic maneuvers. Accelerometer recordings made during aerobatic performances are analyzed in regard to the Gs acting on the pilot during the entire performance and during some specific maneuvers. Human tolerance to Gs and specifically to changes from positive to negative Gs and vice versa is discussed in regard to some published animal and human studies. This report suggests that oscillating Gs as encountered in aerobatics tax the bodys mechanisms to maintain blood perfusion of the brain--and consciousness. Suggestions are given to help pilots reduce the physiological hazards of Gs encountered in aerobatics.
- Stress Physiology