Definition
A circular, pivoting disc inside the carburetor or induction system that rotates to control the volume of air flowing into the engine. Its position is set by the throttle control in the cockpit, and the airflow it permits determines engine power output.
Plain English
A small flat disc inside the engine's air intake that opens and closes to control how much air reaches the engine. Pushing the throttle in opens it; pulling the throttle out closes it.
Context Anchor
Seen in discussions of engine power control, carburetor icing, and induction icing.
Derivation
Throttle comes from an old English word meaning to choke or restrict the throat. The throttle plate literally chokes or opens the engine's air passage, so the name describes exactly what it does.
Why Pilots Care
Ice can form on the throttle plate and restrict airflow, producing an uncommanded loss of engine power.
Grounding Statement
Picture a small round door inside an air tube: turning the door changes how much air can pass through to the engine.
Intuition Check
The throttle plate is not the throttle lever in the cockpit. The cockpit throttle moves the throttle plate, which is the actual part inside the engine’s air path that controls airflow.
Example Sentence 1
At low power settings, the nearly closed throttle plate is a common spot for induction ice to form.
Example Sentence 2
Applying carburetor heat melted the ice that had collected on the throttle plate.