Pilot/Controller Glossary

on the measurement of a transmissometer made near the touchdown point of the instrument runway and is
reported in hundreds of feet. RVR, where available, is used in lieu of prevailing visibility in determining
minimums for a particular runway.
1. Touchdown RVR- The RVR visibility readout values obtained from RVR equipment serving the runway
touchdown zone.
2. Mid-RVR- The RVR readout values obtained from RVR equipment located midfield of the runway.
3. Rollout RVR- The RVR readout values obtained from RVR equipment located nearest the rollout end
of the runway.
(See ICAO term FLIGHT VISIBILITY.)
(See ICAO term GROUND VISIBILITY.)
(See ICAO term RUNWAY VISUAL RANGE.)
(See ICAO term VISIBILITY.)

VISIBILITY [ICAO]- The ability, as determined by atmospheric conditions and expressed in units of distance,
to see and identify prominent unlighted objects by day and prominent lighted objects by night.
a. Flight Visibility- The visibility forward from the cockpit of an aircraft in flight.
b. Ground Visibility- The visibility at an aerodrome as reported by an accredited observer.
c. Runway Visual Range [RVR]- The range over which the pilot of an aircraft on the centerline of a runway
can see the runway surface markings or the lights delineating the runway or identifying its centerline.
VISUAL APPROACH- An approach conducted on an instrument flight rules (IFR) flight plan which authorizes
the pilot to proceed visually and clear of clouds to the airport. The pilot must, at all times, have either the airport
or the preceding aircraft in sight. This approach must be authorized and under the control of the appropriate air
traffic control facility. Reported weather at the airport must be: ceiling at or above 1,000 feet, and visibility of
3 miles or greater.
(See ICAO term VISUAL APPROACH.)

VISUAL APPROACH [ICAO]- An approach by an IFR flight when either part or all of an instrument approach
procedure is not completed and the approach is executed in visual reference to terrain.
VISUAL APPROACH SLOPE INDICATOR (VASI)-
(See AIRPORT LIGHTING.)

VISUAL CLIMB OVER AIRPORT (VCOA)- A departure option for an IFR aircraft, operating in visual
meteorological conditions equal to or greater than the specified visibility and ceiling, to visually conduct
climbing turns over the airport to the published "climb-to" altitude from which to proceed with the instrument
portion of the departure. VCOA procedures are developed to avoid obstacles greater than 3 statute miles from
the departure end of the runway as an alternative to complying with climb gradients greater than 200 feet per
nautical mile. Pilots are responsible to advise ATC as early as possible of the intent to fly the VCOA option prior
to departure. These textual procedures are published in the "Take-Off Minimums and (Obstacle) Departure
Procedures" section of the Terminal Procedures Publications and/or appear as an option on a Graphic ODP.
(See AIM.)

VISUAL DESCENT POINT- A defined point on the final approach course of a nonprecision straight-in
approach procedure from which normal descent from the MDA to the runway touchdown point may be
commenced, provided the approach threshold of that runway, or approach lights, or other markings identifiable
with the approach end of that runway are clearly visible to the pilot.
VISUAL FLIGHT RULES- Rules that govern the procedures for conducting flight under visual conditions. The
term "VFR" is also used in the United States to indicate weather conditions that are equal to or greater than
minimum VFR requirements. In addition, it is used by pilots and controllers to indicate type of flight plan.
(See INSTRUMENT FLIGHT RULES.)
(See INSTRUMENT METEOROLOGICAL CONDITIONS.)
(See VISUAL METEOROLOGICAL CONDITIONS.)
(Refer to 14 CFR Part 91.)
(Refer to AIM.)