Definition
A system in an aircraft that regulates the temperature of air supplied to the cabin, cockpit, or to a component such as a carburetor or engine inlet. It typically uses a mixing valve, blend door, or modulating valve to combine hot and cold airstreams, or to control the flow of air across a heat exchanger, until the desired temperature is reached.
Plain English
The part of the aircraft that decides how warm or cool the air coming into the cabin or another part of the plane should be, and adjusts it automatically.
Context Anchor
Seen in aircraft heating, ventilation, air conditioning, and cabin comfort system descriptions or checklists.
Why Pilots Care
Correct air temperature control maintains engine performance, prevents icing, and keeps the cabin comfortable and safe.
Analogy
It works like the thermostat and blend door in a car's heater: hot air from one source and cooler air from another are mixed together until the temperature coming out of the vents matches what was selected.
Intuition Check
Do not read this as controlling the temperature of the outside air. It means controlling the temperature of the air delivered inside the aircraft.
Example Sentence 1
Before takeoff, the pilot set the cabin air temperature control to a comfortable level for the climb.
Example Sentence 2
Proper use of air temperature control helped prevent carburetor ice during the descent through moist air.