When landing, if the TAS is significantly less than the ground speed, you will have...
True Airspeed (TAS) is the speed of the aircraft relative to the air mass through which it is flying.
Ground speed (GS) is the speed of an aircraft relative to the ground.
A relationship exists between TAS nad GS:
- GS = TAS, in zero wind conditions.
- GS = TAS - Headwind, in headwind conditions, thus, GS < TAS.
- GS = TAS + Tailwind, in tailwind conditions, thus, GS > TAS (it means that the aircraft is moving faster relative to the ground, than it is relative to the air, because the aircraft is being pushed forward by the wind).
The greater the headwind or tailwind component, the greater the difference between GS and TAS.
So, when landing, taking-off or cruising, if the TAS is significantly less than the ground speed, you will have a tailwind.
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