FLIGHT INFORMATION PUBLICATION GENERAL PLANNING(83)

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UPPER INFORMATION REGION/UIR (ICAO) - An airspace of defined dimensions above Flight Information Region(s) within which Flight Information Service and Alerting Service are provided for aircraft operating at high altitudes.
UPWIND LEG - (See Traffic Pattern)
URGENCY (P/CG) - A condition of being concerned about safety and of requiring timely but not immediate assistance; a potential distress condition.
URGENCY (ICAO) - A condition concerning the safety of an aircraft or other vehicle, or of a person on board or in sight, but which does not require immediate assistance.
UNITED STATES AIRPORT OF ENTRY - Aircraft may land at these airports without prior permission to land from United States Customs. However, at least 1 hour advanced notice of arrival must be furnished to Customs. This may be included in the flight plan if filed in Canada or Mexico and if destined to an airport where flight notification service (ADCUS) is available.
UNITED STATES LANDING RIGHTS AIRPORTS (United States Aeronautical Information Publication) - Those airports listed in the Foreign Clearance Guide - North and South America, at which any aircraft may land with Prior Permission Required from United States Customs Service. In addition, advance notice of arrival must be furnished to Customs at least one hour in advance (or as specified in the Foreign Clearance Guide). Since some United States Customs Offices have limited staffs, the maximum number of passengers per individual flight which can be effectively processed at certain locations are as stated in the Foreign Clearance Guide. Note: Selected Landing Rights Airports are identified in the United States IFR Enroute Supplement.

V2 - Takeoff safety speed. (Refer to Federal Air Regulations, Part 91)
VECTOR (P/CG, JCS) - A heading issued to an aircraft to provide navigational guidance by radar.
VECTOR (JCS) - In air intercept, close air support and air interdiction usage, alter heading to magnetic heading indicated. Heading ordered must be in three digits; e.g., "vector" zero six zero (for homing, use "steer").
VERIFY - Request confirmation of information; e.g., "verify assigned altitude."
VERIFY SPECIFIC DIRECTION OF TAKE-OFF (OR TURNS AFTER TAKE-OFF) - Used by Air Traffic Control to ascertain an aircraft's direction of take-off and/or direction of turn after take-off. It is normally used for IFR departures from an airport not having a control tower. When direct communication with the pilot is not possible, the request and information may be relayed through a Flight Service Station, dispatcher, or by other means. (See IFR Take-off Minimums and Departure Procedures)
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:
　
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