Definition
A flight condition in which the load factor on the airplane is less than 1G (low G) or below zero (negative G). At 1G, occupants and unsecured items feel their normal weight. Below 1G they feel lighter than normal, and at 0G or negative G they feel weightless or pushed upward, away from their seat. This typically occurs during pushovers, abrupt forward stick inputs, or when entering a steep descent from level flight.
Plain English
A moment in flight when you feel lighter in your seat than usual, float, or get pushed upward against your seatbelt instead of being pressed down into the seat.
Context Anchor
Seen in maneuvering discussions, especially when abrupt control inputs, turbulence, or unusual attitudes can briefly reduce or reverse the normal force felt in the airplane.
Derivation
G refers to the force of gravity felt at rest on the ground — 1G is normal weight. 'Load' here means the apparent force on the airplane and its occupants. 'Low G' means less than normal weight; 'negative G' means the force reverses direction and pushes you up instead of down.
Why Pilots Care
Can interrupt fuel flow in carbureted engines, reduce control effectiveness, and lead to loss of situational awareness.
Analogy
It is like going over the top of a hill in a car and briefly feeling light in your seat. In an airplane, that same light or lifting feeling can come from the airplane’s motion or from an abrupt control input.
Grounding Statement
Imagine driving over a sharp hump in the road fast enough that you briefly lift off the seat — that floating sensation is low or negative G.
Intuition Check
Negative G does not mean “bad G.” It means the force is acting opposite the normal direction that presses you into the seat.
Example Sentence 1
When the instructor demonstrated a brisk pushover, the student felt a low-G sensation as their kneeboard floated off their lap.
Example Sentence 2
The pilot recognized the low or negative G load when the nose pitched down and the sensation of weight disappeared.