What airspeed, when corrected for compressibility effects, results in equivalent airspeed?

The airspeed that results in equivalent airspeed when corrected for compressibility effects is calibrated airspeed. Calibrated airspeed is derived from indicated airspeed by accounting for the aircraft's instrument and position errors. To achieve equivalent airspeed, which is crucial for accurate performance calculations at varying altitudes and speeds, the compressibility corrections must also be applied, particularly as speeds approach or exceed the speed of sound.

Calibrated airspeed provides a measurement that reflects what the true aerodynamic conditions are, allowing for better predictions of the aircraft's performance by taking into account the effects of air density and compressibility at different altitudes. This makes calibrated airspeed a critical component in ensuring the reliability of the measurements in relation to the aircraft's aerodynamic characteristics.

In contrast, indicated airspeed is the raw reading from the airspeed indicator and does not account for these corrections. True airspeed measures the actual speed of the aircraft through the air and will also vary based on altitude and temperature without corresponding corrections for compressibility. Ground airspeed measures how fast the aircraft moves over the ground, which can be influenced by wind conditions and does not relate directly to compressibility. Therefore, calibrated airspeed is the appropriate choice for achieving equivalent airspeed when accounting for these important factors