The FAA Has Issued An Advisory For All Aircraft, Whether Large Or Small, To Use Their Transponders In The Altitude Reporting Mode On The Ground
There was a time when transponders first entered wide use in general aviation that the rule was to always have it off or in standby on the ground, and to be prepared to use the standby mode if a controller requested it in flight. In those early days it was possible to overload the capability of controllers to follow transponder traffic. That’s changed, but there is still one very special place and time when transponders must be deactivated.
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