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Encyclopedia > Visual meteorological conditions

In aviation, visual meteorological conditions (or VMC) are those in which visual flight rules (VFR) flight is permitted—that is, conditions in which pilots have sufficient visibility to fly the aircraft without reference to instruments and can maintain visual separation from terrain and other aircraft. ... Visual flight rules (VFR) are a set of aviation regulations under which a pilot may operate an aircraft, if weather conditions are sufficient to allow the pilot to visually control the aircrafts attitude, navigate, and maintain separation with obstacles such as terrain and other aircraft. ... Flight is the process of flying: either movement through the air by aerodynamically generating lift or aerostatically using buoyancy, or movement beyond earths atmosphere by spacecraft. ...


Visual meteorological conditions are usually defined by certain visibility minimums, cloud ceilings (for takeoffs and landings), and cloud clearances.


The exact requirements vary by type of airspace, whether it is day or night (for countries that permit night VFR), and from country to country. Typical visibility requirements vary from one statute mile to five statue miles. Typical cloud clearance requirements vary from merely remaining clear of clouds to remaining at least one mile away from clouds horizontally and one thousand feet away from clouds vertically. Airspace means the portion of the atmosphere controlled by a particular country on top of its territory and territorial waters or, more generally, any specific portion of the atmosphere. ...


Generally, VMC requires greater visibility and cloud clearance in controlled airspace than in uncontrolled airspace. In uncontrolled airspace there is less risk of a VFR aircraft colliding with an IFR aircraft emerging from a cloud, so airplanes are permitted to fly closer to clouds. Controlled airspace exists in areas where air traffic control is capable of providing traffic separation. ... Uncontrolled airspace exists wherever a control service cant be provided for whatever reason, or is not deemed necessary, many of them are above mountains or oceans. ... An aircraft is any machine capable of atmospheric flight. ... Instrument flight rules (IFR) allow an aircraft to be flown in weather conditions that do not meet the minimum requirements for visual flight rules (VFR). ...


See also

  • U.S. Federal Aviation Regulations defining visual meteorological conditions.

  Results from FactBites:
 
NTSB Accident Report (3163 words)
Visual meteorological conditions prevailed at the Haines airport, but low cloud conditions prevailed along the route of flight.
Visual meteorological conditions prevailed and an Instrument Flight Rules flight plan was filed for the 14 Code of Federal Regulations Part 129 international cargo flight that originated from Mexico City at 0245.
Visual meteorological conditions prevailed at the time and an instrument flight rules flight plan was filed.
Visual meteorological conditions - Wikipedia, the free encyclopedia (258 words)
In aviation, visual meteorological conditions (or VMC) are those in which visual flight rules (VFR) flight is permitted—that is, conditions in which pilots have sufficient visibility to fly the aircraft without reference to instruments and can maintain visual separation from terrain and other aircraft.
The boundary criteria between IMC and VMC are known as the VMC minima.
Visual meteorological conditions are usually defined by certain visibility minimums, cloud ceilings (for takeoffs and landings), and cloud clearances.
  More results at FactBites »

 
 

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