Why is it important to correct indicated airspeed for pressure and temperature?

Correcting indicated airspeed for pressure and temperature is crucial to achieving accurate true airspeed readings. Indicated airspeed, the speed shown on the aircraft's airspeed indicator, is affected by environmental conditions such as air density, which varies with altitude and temperature. As an aircraft climbs, the air pressure decreases, leading to a greater difference between true airspeed and indicated airspeed. By making corrections for pressure and temperature, pilots can accurately assess their true airspeed, which is vital for proper flight planning, fuel management, performance calculations, and ensuring safe navigation.

Understanding true airspeed is essential, especially during phases of flight that require precise speed control, such as takeoff, landing, and during maneuvers where specific airspeeds must be maintained.