ATC speed instruction

Hi all,

Quick question: When an ATC controller is instructing you to go below a certain speed is this in airspeed or groundspeed?

Gr,

Victor IFFG

This is the Airspeed that they’re referring to.

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Yep as deercrusher said it’s Air speed. Not to be confused with what they can see which is ground speed.

Thanks, I just saw you at LXGB I was the airbus A320 TAP landing after you ;)

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Question answered. Everyone is a happy pilot. 🙂