Definition
The temperature of the air sensed by an aircraft in flight, including the heating effect caused by the air being slowed and compressed against the temperature probe. Total air temperature equals the static (true outside) air temperature plus the temperature rise produced by the aircraft's motion through the air.
Plain English
The temperature an aircraft's probe actually feels in flight, which is warmer than the real outside air because moving fast through air heats the probe.
Context Anchor
Seen in air data systems, temperature probe checks, turbine engine performance discussions, and high-speed flight indications.
Derivation
"Total" here means "everything added together" — the true outside air temperature plus the extra warming caused by the aircraft slowing the airflow at the probe. It is contrasted with "static" temperature, which is the temperature of the undisturbed air.
Why Pilots Care
Total air temperature is what the aircraft sensor reads directly, but performance calculations, true airspeed, and icing decisions depend on the static (true) outside air temperature. The air data computer uses TAT to work backward to the real outside temperature, so understanding the difference matters for interpreting cockpit indications correctly.
Grounding Statement
Imagine sticking your hand out of a car window on a cool day — at low speed it feels close to the real air temperature, but at high speed the air piling up against your hand feels warmer. That extra warmth is the difference between static and total air temperature.
Intuition Check
Total air temperature does not mean the same thing as ordinary outside air temperature. It means outside air temperature plus the warming created by the aircraft’s motion at the sensor.
Example Sentence 1
At cruise, the crew compared the total air temperature reading on the display to the calculated static air temperature to confirm the air data computer was working correctly.
Example Sentence 2
Ice protection systems activate based on total air temperature to prevent probe blockage.