Definition
The component of a fuel injection system that houses the throttle valve, which controls the volume of air flowing into the engine's intake manifold in response to throttle lever movement. In a continuous-flow fuel injection system, the throttle body is paired with a fuel control unit that meters fuel in proportion to the airflow passing through it.
Plain English
The part of the engine that opens and closes to let more or less air in when the pilot moves the throttle. It is the airflow gateway between the outside air and the engine cylinders.
Context Anchor
Encountered in piston-engine systems, fuel-injection discussions, carburetor discussions, and maintenance write-ups about engine power or throttle response.
Derivation
Throttle comes from Old English 'throtian,' meaning to choke or strangle — the valve choked off airflow when closed. Body here means the housing or assembly that contains the valve. So a throttle body is literally the housing for the airflow-choking valve.
Why Pilots Care
Proper function of the throttle body ensures accurate engine power response and prevents issues like icing or sticking that could affect flight safety.
Intuition Check
The throttle body is not the cockpit throttle control itself. It is the engine-mounted housing that the throttle control operates.
Example Sentence 1
The mechanic inspected the throttle body for signs of wear after the pilot reported sluggish throttle response on takeoff.
Example Sentence 2
Mechanics cleaned the throttle body to restore smooth engine response at low power settings.