VERTICAL SEPARATION (P/CG) - Separation established by assignment of different altitudes or Flight Levels. (See Separation)
VERTICAL SEPARATION (JCS, NATO) - A specified vertical distance measured in terms of space between aircraft in flight at different altitudes or Flight Levels.
VERTICAL SEPARATION (ICAO) - Separation between aircraft expressed in units of vertical distance.
VERTICAL TAKEOFF AND LANDING AIRCRAFT/VTOL aircraft - Aircraft capable of vertical climbs and/or descents and of using very short runways or small areas for take-off and landings. These aircraft include, but are not limited to, helicopters. (See Short Take-off and Landing Aircraft)
VERY HIGH FREQUENCY/VHF - The frequency band between 30 and 300 megahertz. Portions of this band, 108 to 118 megahertz, are used for certain navigational aids; 118 to 136 megahertz are used for civil air/ground voice communications. Other frequencies in this band are used for purposes not related to Air Traffic Control.
VERY LOW FREQUENCY/VLF - The frequency band between 3 and 30 kilohertz.
VFR AIRCRAFT/VFR FLIGHT - An aircraft conducting flight in accordance with Visual Flight Rules. (See Visual Flight Rules)
VFR CONDITIONS - Weather conditions equal to or better than the minimum for flight under VFR. The term may be used as an Air Traffic Control clearance/instruction only when:
(1)
An IFR aircraft requests a climb/descent in VFR conditions.
(2)
The clearance will result in noise abatement benefits where part of the IFR departure route does not conform to a Federal Aviation Administration approved noise abatement route or altitude.
(3)
A pilot has requested a practice instrument approach and is not on an IFR flight plan.
(4)
All pilots receiving this authorization must comply with the VFR visibility and distance from cloud criteria in Federal
Air Regulations Part 91. Use of the term does not relieve controllers of their responsibility to separate aircraft in Terminal Control Areas/Terminal Radar Service Areas as required by Federal Aviation Administration Handbook 7110.65. When used as an Air Traffic Control clearance/instruction, the term may be abbreviated "VFR," e.g., "Maintain VFR," "Climb/descend VFR," etc.
VFR ON TOP - Air Traffic Control authorization for an IFR aircraft to operate in VFR conditions at any appropriate VFR altitude (as specified in Federal Air Regulations and as restricted by Air Traffic Control). A pilot receiving this authorization must comply with the VFR visibility, distance from cloud criteria, and the minimum IFR altitudes specified in Federal Air Regulations Part 91. The use of this term does not relieve controllers of their responsibility to separate aircraft in Terminal Control Areas/Terminal Radar Service Areas as required by Federal Aviation Administration Handbook 7110.65.
VFR MILITARY TRAINING ROUTES/VR - Routes used by the Department of Defense and associated Reserve and Air Guard units for the purpose of conducting low-altitude navigation and tactical training under VFR below 10,000 feet mean sea level at airspeeds in excess of 250 knots indicated airspeed.
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