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VFR requires a pilot to be able to see outside the cockpit to control the aircraft's altitude, navigate, and avoid obstacles and other aircraft. [3] Governing agencies establish specific requirements for VFR flight, including minimum visibility, and distance from clouds, to ensure that aircraft operating under VFR are visible from enough distance to ensure safety.
Most countries have requirements that specify weather minima, aircraft equipment and pilot qualifications. [ 1 ] In some countries pilots are required to get an air traffic control (ATC) clearance, or in absence of a controller, advise the nearest flight service station or center.
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]
VFR visibility and cloud clearance requirements are the same as for class C and D airspaces when below 10,000 feet (3,000 m) MSL. Above 10,000 ft MSL, the visibility requirement is extended to 5 miles (8 km) and the cloud clearance requirement is extended to 1,000 feet (300 m) below clouds, 1,000 feet (300 m) above, and 1 mile (1.6 km) laterally.
Position lights are required from sunset to sunrise (see FAR 91.209 and AIM 4-3-23). [9] Additional equipment required for VFR flight during the standard definition of night is given in FAR 91.205c, and summarized by the FLAPS mnemonic: [10] Fuses; Landing light (if for hire) Anti-collision lights (beacon, strobe) Position lights; Source of ...
Flight conditions reported as equal to or greater than these VFR minimums are referred to as visual meteorological conditions (VMC). Any aircraft operating under VFR must have the required equipment on board, as described in FAR Part 91.205 [5] (which includes some instruments necessary for IFR
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.
[citation needed] Efforts to reduce this separation above flight level 290 began almost immediately, [4] but doing so without compromising safety required improvements in altimeters and other equipment, due in part to inherent difficulties in accurately determining and maintaining aircraft altitudes and, therefore, the actual vertical distance ...