Definition
A system that warms the airplane cabin by routing outside air across a heat exchanger surrounding the engine exhaust system, then ducting that warmed air into the cabin through a pilot-controlled valve.
Plain English
Fresh outside air is passed around the hot exhaust pipes to warm it up, and that warm air is then sent into the cabin to keep the pilots and passengers comfortable.
Context Anchor
You encounter cabin heating during preflight inspection, before-takeoff checks, and cold-weather flying when using the cabin heat control.
Derivation
Cabin comes from an old word for a small room or enclosed shelter. In aviation, it means the enclosed space where the pilot and passengers sit, so cabin heating means warming that occupied space.
Why Pilots Care
Adequate cabin heating prevents pilot performance loss from cold stress and keeps passengers comfortable on longer flights.
Intuition Check
Do not assume cabin heating is only a comfort feature. In many training airplanes, it is connected to the engine exhaust area, so it has both comfort and safety importance.
Example Sentence 1
On a cold morning, the pilot pulled the cabin heat knob out shortly after takeoff to warm the cockpit.
Example Sentence 2
During the preflight, the instructor checked that cabin heating produced warm air at the vents.