Definition
The load imposed on an aircraft and its occupants expressed as a multiple of the force of gravity. A G-load of 1 equals the aircraft's normal weight in level flight; a G-load of 2 means the structure and occupants are experiencing forces equal to twice their normal weight. G-load increases during maneuvers that change the aircraft's flight path, such as pull-ups, steep turns, and recovery from dives.
Plain English
How heavy the airplane and everyone in it feel during a maneuver, measured in multiples of normal weight. At 2 G's, you and the airplane effectively weigh twice as much as usual.
Context Anchor
In the Airplane Flying Handbook spiral dive discussion, G-load matters because a pilot may try to pull out of a fast, steep descending turn and accidentally place very high stress on the airplane.
Derivation
The 'G' stands for gravity. Using G as a unit lets pilots and engineers describe forces on the aircraft in a way that scales with its normal weight, regardless of the aircraft's size.
Why Pilots Care
High G-loads can overstress the airframe or cause pilot blackout if limits are exceeded.
Analogy
A sharp turn in a car can press you sideways into the seat. In an airplane, a hard pull or steep turn can press you down into the seat and make you feel heavier; that added heaviness is G-load.
Intuition Check
G-load does not mean cargo weight or how much baggage is in the airplane. It means the force placed on the airplane and pilot by acceleration, measured in multiples of normal weight.
Example Sentence 1
During recovery from the spiral dive, the pilot eased back on the controls smoothly to avoid imposing an excessive G-load on the airframe.
Example Sentence 2
Steep turns at high speed quickly raise the G-load felt on the wings and seats.