Order 7110.65P, Air Traffic Control, with changes

2/19/04Pilot/Controller GlossaryVVASI−(See VISUAL APPROACH SLOPE INDICATOR.)VDF−(See DIRECTION FINDER.)VDP−(See VISUAL DESCENT POINT.)VECTOR− A heading issued to an aircraft to providenavigational guidance by radar.(See ICAO term RADAR VECTORING.)VERIFY− Request confirmation of information;e.g., “verify assigned altitude.”VERIFY SPECIFIC DIRECTION OF TAKEOFF(OR TURNS AFTER TAKEOFF)− Used by ATC toascertain an aircraft’s direction of takeoff and/ordirection of turn after takeoff. It is normally used forIFR departures from an airport not having a controltower. When direct communication with the pilot isnot possible, the request and information may berelayed through an FSS, dispatcher, or by othermeans.(See IFR TAKEOFF MINIMUMS ANDDEPARTURE PROCEDURES.)VERTEX− The last fix adapted on the arrival speedsegments. Normally, it will be the outer marker of therunway in use. However, it may be the actualthreshold or other suitable common point on theapproach path for the particular runway configuration.VERTEX TIME OF ARRIVAL− A calculated time ofaircraft arrival over the adapted vertex for the runwayconfiguration in use. The time is calculated via theoptimum flight path using adapted speed segments.VERTICAL NAVIGATION (VNAV)– A function ofarea navigation (RNAV) equipment which calculates,displays, and provides vertical guidance to a profileor path.VERTICAL SEPARATION− Separation establishedby assignment of different altitudes or flight levels.(See SEPARATION.)(See ICAO term VERTICAL SEPARATION.)VERTICAL SEPARATION [ICAO]− Separationbetween aircraft expressed in units of vertical distance.VERTICAL TAKEOFF AND LANDING AIR-CRAFT− Aircraft capable of vertical climbs and/ordescents and of using very short runways or smallareas for takeoff and landings. These aircraft include,but are not limited to, helicopters.(See SHORT TAKEOFF AND LANDINGAIRCRAFT.)VERY HIGH FREQUENCY− The frequency bandbetween 30 and 300 MHz. Portions of this band, 108to 118 MHz, are used for certain NAVAIDs; 118 to136 MHz are used for civil air/ground voice communications.Other frequencies in this band are used forpurposes not related to air traffic control.VERY HIGH FREQUENCY OMNIDIRECTION-AL RANGE STATION−(See VOR.)VERY LOW FREQUENCY− The frequency bandbetween 3 and 30 KHz.VFR−(See VISUAL FLIGHT RULES.)VFR AIRCRAFT− An aircraft conducting flight inaccordance with visual flight rules.(See VISUAL FLIGHT RULES.)VFR CONDITIONS− Weather conditions equal toor better than the minimum for flight under visualflight rules. The term may be used as an ATCclearance/instruction only when:a. An IFR aircraft requests a climb/descent inVFR conditions.b. The clearance will result in noise abatementbenefits where part of the IFR departure route doesnot conform to an FAA approved noise abatementroute or altitude.c. A pilot has requested a practice instrumentapproach and is not on an IFR flight plan.Note: All pilots receiving this authorization mustcomply with the VFR visibility and distance fromcloud criteria in 14 CFR Part 91. Use of the termdoes not relieve controllers of their responsibility toseparate aircraft in Class B and Class C airspacePCG V−1