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VFR / VMC visibility requirements in the US. In aviation, visual meteorological conditions (VMC) is an aviation flight category in which visual flight rules (VFR) flight is permitted—that is, conditions in which pilots have sufficient visibility to fly the aircraft maintaining visual separation from terrain and other aircraft.
In aviation, visual flight rules (VFR) is a set of regulations under which a pilot operates an aircraft in weather conditions generally clear enough to allow the pilot to see where the aircraft is going. Specifically, the weather must be better than basic VFR weather minima, i.e., in visual meteorological conditions (VMC), as specified in the ...
The US rules require the aircraft to be fitted with the instruments required for IFR flight, [3] and student pilots [4] and sport pilots [5] must maintain visual reference with the surface. Other operations (such as commercial, turbine powered, and fractional ownership) include special limitations.
A pilot's view of the runway just before landing in thick fog at night. In aviation, instrument meteorological conditions (IMC) are weather conditions that require pilots to fly primarily by reference to flight instruments, and therefore under instrument flight rules (IFR), as opposed to flying by outside visual references under visual flight rules (VFR).
It usually happens when the aircraft is inside controlled airspace, and the local weather is less than the minimums required for flight under visual flight rules (VFR) within the airspace in question. [5] Note that an aircraft might be able to fly under SVFR even in Class A airspace, where instrument flight rules (IFR) flight is the norm. [6]
Performance and weather minima generally relates to the worst conditions and lowest performance in which operations can be permitted. Performance is dependant both on weather and on the altitude of an airfield.
Minimum weather visibility of 3 miles from control station (500 feet of visibility below clouds, and 2000 feet horizontally away from clouds). [33] Operations in Class B, C, D and E airspace are allowed with the required ATC permission. Operations in Class G airspace are allowed without ATC permission.
Candidates for the instrument rating must be knowledgeable in IFR-related items in the AIM, the U.S. ATC system and procedures, IFR navigation, the use of IFR charts, aviation weather, requirements for operating under IFR conditions, recognition of critical weather, Aeronautical Decision Making (ADM) and Crew Resource Management (CRM).