What is the function of total air temperature (TAT) probes on an aircraft?

The function of total air temperature (TAT) probes on an aircraft is to measure outside air temperature. TAT probes are designed to provide accurate readings of the temperature of the air entering the aircraft, which is critical for various flight operations. These probes take into account the kinetic energy from the aircraft's speed as well as the ambient air temperature, giving a total air temperature that is used in performance calculations and for ensuring the proper operation of engine systems.

This information is essential for evaluating aircraft performance, as temperature affects engine efficiency, lift generation, and overall flight safety. In contrast, the other options do not represent the function of TAT probes. For example, altitude and airspeed are measured through different sensors and systems within the aircraft, while vertical speed is measured using a variometer. Therefore, the correct interpretation of the role of TAT probes confirms their specific function in measuring outside air temperature, which is critical for effective aircraft operation.