Order 7110.65P, Air Traffic Control, with changes

Pilot/Controller Glossary 2/19/04or TRSAs as required by FAAO 7110.65. Whenused as an ATC clearance/instruction, the termmay be abbreviated “VFR;” e.g., “MAINTAINVFR,” “CLIMB/DESCEND VFR,” etc.VFR FLIGHT−(See VFR AIRCRAFT.)VFR MILITARY TRAINING ROUTES− Routesused by the Department of Defense and associatedReserve and Air Guard units for the purpose ofconducting low-altitude navigation and tactical trainingunder VFR below 10,000 feet MSL at airspeedsin excess of 250 knots IAS.VFR NOT RECOMMENDED− An advisory providedby a flight service station to a pilot during apreflight or inflight weather briefing that flight undervisual flight rules is not recommended. To be givenwhen the current and/or forecast weather conditionsare at or below VFR minimums. It does not abrogatethe pilot’s authority to make his/her own decision.VFR-ON-TOP− ATC authorization for an IFRaircraft to operate in VFR conditions at any appropriateVFR altitude (as specified in 14 CFR and asrestricted by ATC). A pilot receiving this authorizationmust comply with the VFR visibility, distancefrom cloud criteria, and the minimum IFR altitudesspecified in 14 CFR Part 91. The use of this termdoes not relieve controllers of their responsibility toseparate aircraft in Class B and Class C airspace orTRSAs as required by FAAO 7110.65.VFR TERMINAL AREA CHARTS−(See AERONAUTICAL CHART.)VFR WAYPOINT−(See WAYPOINT.)VHF−(See VERY HIGH FREQUENCY.)VHF OMNIDIRECTIONAL RANGE/TACTICALAIR NAVIGATION−(See VORTAC.)VIDEO MAP− An electronically displayed map onthe radar display that may depict data such as airports,heliports, runway centerline extensions, hospitalemergency landing areas, NAVAIDs and fixes,reporting points, airway/route centerlines, boundaries,handoff points, special use tracks, obstructions,prominent geographic features, map alignment indicators,range accuracy marks, minimum vectoringaltitudes.VISIBILITY− The ability, as determined by atmosphericconditions and expressed in units of distance,to see and identify prominent unlighted objects byday and prominent lighted objects by night. Visibilityis reported as statute miles, hundreds of feet ormeters.(Refer to 14 CFR Part 91.)(Refer to AIM.)a. Flight Visibility− The average forward horizontaldistance, from the cockpit of an aircraft in flight,at which prominent unlighted objects may be seenand identified by day and prominent lighted objectsmay be seen and identified by night.b. Ground Visibility− Prevailing horizontal visibilitynear the earth’s surface as reported by theUnited States National Weather Service or an accreditedobserver.c. Prevailing Visibility− The greatest horizontalvisibility equaled or exceeded throughout at least halfthe horizon circle which need not necessarily becontinuous.d. Runway Visibility Value (RVV)− The visibilitydetermined for a particular runway by a transmissometer.A meter provides a continuous indication ofthe visibility (reported in miles or fractions of miles)for the runway. RVV is used in lieu of prevailingvisibility in determining minimums for a particularrunway.e. Runway Visual Range (RVR)− An instrumentallyderived value, based on standard calibrations,that represents the horizontal distance a pilot will seedown the runway from the approach end. It is basedon the sighting of either high intensity runway lightsor on the visual contrast of other targets whicheveryields the greater visual range. RVR, in contrast toprevailing or runway visibility, is based on what apilot in a moving aircraft should see looking down therunway. RVR is horizontal visual range, not slantvisual range. It is based on the measurement of atransmissometer made near the touchdown point ofthe instrument runway and is reported in hundreds offeet. RVR is used in lieu of RVV and/or prevailingvisibility in determining minimums for a particularrunway.1. Touchdown RVR− The RVR visibility readoutvalues obtained from RVR equipment serving therunway touchdown zone.2. Mid-RVR− The RVR readout values obtainedfrom RVR equipment located midfield of the runway.PCG V−2