What is Outside Air Temperature (OAT)?

Outside Air Temperature (OAT) refers specifically to the ambient air temperature surrounding the aircraft while it is in flight. This measurement is crucial for various aspects of aircraft performance, as it directly affects engine efficiency, lift, and aerodynamic performance. Pilots rely on accurate OAT readings to make informed decisions about flight operations, including fuel management, altitude adjustments, and the potential for ice accumulation on the wings.

In the context of aviation, knowing the OAT helps in calculating performance metrics such as takeoff distance, climb rates, and other operational parameters. It is different from other temperature measurements, such as engine exhaust temperature, cabin temperature, or runway temperatures, which serve different purposes and are relevant in different contexts.