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visual flight rules, Visual Flight Rules, VFR
A set of regulations set down by the U.S. Civil Aeronautics Board, operating within Civil Air Regulations, to govern the operational control of aircraft during visual flight, including minimum visibility standards relating to cloud separation, haze, precipitation, etc. which are more stringent than those for instrument flight.
The abbreviation VFR is seldom used to indicate the regulations themselves; however, it is often utilized to describe the weather and flight conditions to which such rules are applicable.
This entry is located in the following unit: vid-, video-, vis-, -vision, -visional, -visionally, visuo-, vu- (page 17)