PRECISION APPROACH RADAR (PAR) A standard Instrument Approach Procedure in
which an electronic glideslope is provided. In this type of approach the pilot is provided with
course and altitude information. A PAR approach is a precision approach. (See Ground
PUBLISHED ROUTE A route for which an IFR altitude has been established and published,
e.g., federal airways, jet routes, area navigation routes, specified direct (feeder) routes.
PROCEDURE TURN (PT) A maneuver used to reverse direction to establish an aircraft on
the intermediate approach segment or final approach course of an instrument approach. The
outbound course, direction of turn, distance within which the turn must be completed, and
minimum altitude are specified in the procedure. However, the point at which the turn may be
commenced, and the type and rate of turn, are left to the discretion of the pilot.
RADAR ENVIRONMENT An area in which radar service may be provided.
RADAR IDENTIFICATION The process of ascertaining that a radar target is the radar return
from a particular aircraft.
RADAR VECTOR A heading issued to an aircraft to provide navigational guidance by radar.
RADIAL A radial is a magnetic bearing extending from a VOR, VORTAC, or TACAN.
RADIO MAGNETIC INDICATOR (RMI) A navigation instrument that indicates both
magnetic heading and magnetic bearing to a selected radio navigation facility.
REPORTING POINT A specified geographic location in relation to which the position of an
aircraft can be reported.
RUNWAY VISUAL RANGE (RVR) The horizontal distance a pilot will see down the
runway from the approach end. RVR is determined with electronic instruments and is reported
in hundreds of feet. RVR, in contrast to prevailing or runway visibility, is based on what a pilot
in a moving aircraft should see looking down the runway. RVR is horizontal visual range (NOT
SHALLOW INTERCEPT Aircraft heading within 30º of the desired course and tracking
toward it. (Note: This definition applies to Primary Intrument training only.)
SHORT RANGE CLEARANCE A clearance issued to a departing IFR flight which
authorizes IFR flight to a specific fix short of the destination while air traffic control facilities are
coordinating and obtaining the complete clearance.
STANDARD INSTRUMENT DEPARTURE (SID) A preplanned, coded, air traffic control
IFR departure routing, preprinted for pilot use in graphic and textual form.
STATION A radio navigational aid (see NAVAID).