Remove Ceiling Remove Instrument Flight Rules Remove Omni-Directional Range
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Drone Lingo Simplified: Acronyms Every Pilot Needs To Know

Pilot Institute

AGL is important for drone pilots as the regular ceiling for drone flight is defined as 400 feet AGL. IFR Instrument Flight Rules IFR is the set of rules that allow pilots to fly by reference to instruments in the flight deck when flying by visual reference is not safe.

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