{Airspeed} When is the true airspeed equal to groundspeed?

Question

BlackTom AI · Accepted Answer

True airspeed (TAS) is the speed of an aircraft relative to the air mass through which it is flying, while groundspeed (GS) is the speed of the aircraft relative to the ground. The relationship between TAS and GS is influenced by wind conditions. Specifically, GS is the vector sum of TAS and the wind speed vector.

1. **When the aircraft is flying into a head-wind**: In this scenario, the wind is opposing the direction of the aircraft's motion. As a result, the groundspeed is reduced by the wind speed component acting against the aircraft's trajectory. Thus, GS < TAS, making this option incorrect.

2. **When the aircraft is flying with a tail-wind**: Here, the wind is aiding the aircraft's motion, increasing the groundspeed by the wind speed component in the direction of the aircraft's trajectory. Consequently, GS > TAS, which also makes this option incorrect.

3. **When the aircraft is flying in a no-wind situation**: In the absence of wind, there is no external velocity component affecting the aircraft's motion relative to the ground. Therefore, the groundspeed is equal to the true airspeed, as GS = TAS + 0. This makes this option correct.

4. **When the temperature at altitude is at the ICAO standard temperature**: The ICAO standard atmosphere defines a set of conditions, including temperature, pressure, and density, which are used as a reference for calibrating instruments and performance calculations. While temperature affects air density and thus the indicated airspeed (IAS) to TAS conversion, it does not directly affect the relationship between TAS and GS. Therefore, this condition does not ensure that TAS equals GS, making this option incorrect.

In summary, the only condition under which true airspeed equals groundspeed is when there is no wind affecting the aircraft's motion, as any wind component would alter the groundspeed relative to the true airspeed.

{Airspeed} When is the true airspeed equal to groundspeed?Single choice

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