Definition
A flight control system, typically found in high-performance and fly-by-wire aircraft, that automatically prevents the pilot from commanding maneuvers that would exceed the aircraft's structural load factor limits. The system monitors accelerations sensed by the aircraft and restricts pitch or control authority before the airframe is overstressed.
Plain English
An automatic safety system that stops the pilot from pulling or pushing on the controls hard enough to bend or break the aircraft.
Context Anchor
Seen in discussions of high-performance aircraft, swept-wing behavior, stall protection, and flight-control systems.
Derivation
‘G’ refers to the force of gravity used as a unit of acceleration — pulling 4 G means feeling four times your normal weight. ‘Limiter’ comes from Latin limes, meaning ‘boundary.’ Together: a device that sets a boundary on how many G the pilot can pull.
Why Pilots Care
Prevents overstressing the airframe and potential structural failure during aggressive maneuvers.
Grounding Statement
If the pilot pulls harder than the airplane should safely allow, the G-limiter reduces or blocks the extra command.
Intuition Check
Do not assume a G-limiter makes the airplane automatically safe in every maneuver. It limits G force; it does not remove the need to manage speed, attitude, and stall risk.
Example Sentence 1
During the high-G turn, the G-limiter held the aircraft at 7.5 G even though the pilot was pulling harder on the stick.
Example Sentence 2
With the G-limiter active, the pilot could maneuver confidently without worrying about exceeding the airplane's design load.