Definition
A condition in which a pilot experiencing high G-forces suffers partial impairment of vision, hearing, cognition, or motor control without fully losing consciousness. Symptoms can include tunnel vision, greying out, confusion, disorientation, and temporary inability to process information or operate controls correctly.
Plain English
A state where a pilot pulling heavy G-forces nearly blacks out. They stay awake, but their senses, thinking, and body don't work properly for several seconds.
Context Anchor
Seen in aeromedical, aerobatic, military, and high-performance flying discussions, especially when talking about G forces and pilot blackout risk.
Why Pilots Care
Recognizing the symptoms lets the pilot ease off the controls immediately to restore blood flow and avoid progressing to full G-LOC.
Grounding Statement
Picture a pilot pulling hard in a turn, still awake, but with vision closing in and reactions slowing.
Intuition Check
Do not assume “almost” means harmless or under control. Here it means the pilot may already be impaired enough to lose safe control of the aircraft.
Example Sentence 1
During a tight turn under heavy G-load, the pilot felt the early signs of A-LOC and immediately eased back on the stick to reduce the G-force.
Example Sentence 2
Training teaches pilots to recognize almost loss of consciousness early so they can reduce G-load before control of the aircraft is lost.