When is true airspeed accurately depicted?

True airspeed is accurately depicted at sea level under standard conditions because true airspeed is defined as the actual speed of the aircraft relative to the surrounding air. At sea level, under standard atmospheric conditions, the air density is at a specific value, which results in accurate calculations of true airspeed.

Standard conditions at sea level are defined as a temperature of 15 degrees Celsius and a pressure of 29.92 inches of mercury (Hg), which creates a baseline for aerodynamic performance calculations. Under these conditions, the indicated airspeed can be converted directly to true airspeed without additional corrections for temperature or pressure differences.

While true airspeed can also be represented at higher altitudes, it becomes more complex due to changes in air density and temperature. Thus, it is most accurately reflected at sea level with standard atmospheric conditions.