Pilot/Controller Glossary
12/2/21
aircraft’s heading at or below 1200’ AGL. Departing
flights may receive a wind shear alert after they start
the takeoff roll and may elect to abort the takeoff.
Aircraft on approach receiving an alert may elect to
go around or perform a wind shear escape maneuver.
PREFERENTIAL ROUTES
−
Preferential routes
(PDRs, PARs, and PDARs) are adapted in ARTCC
computers to accomplish inter/intrafacility controller
coordination and to assure that flight data is posted at
the proper control positions. Locations having a need
for these specific inbound and outbound routes
normally publish such routes in local facility
bulletins, and their use by pilots minimizes flight
plan route amendments. When the workload or traffic
situation permits, controllers normally provide radar
vectors or assign requested routes to minimize
circuitous routing. Preferential routes are usually
confined to one ARTCC’s area and are referred to by
the following names or acronyms:
a.
Preferential Departure Route (PDR). A specific
departure route from an airport or terminal area to an
en route point where there is no further need for flow
control. It may be included in an Instrument
Departure Procedure (DP) or a Preferred IFR Route.
b.
Preferential Arrival Route (PAR). A specific
arrival route from an appropriate en route point to an
airport or terminal area. It may be included in a
Standard Terminal Arrival (STAR) or a Preferred IFR
Route. The abbreviation “PAR” is used primarily
within the ARTCC and should not be confused with
the abbreviation for Precision Approach Radar.
c.
Preferential Departure and Arrival Route
(PDAR). A route between two terminals which are
within or immediately adjacent to one ARTCC’s area.
PDARs are not synonymous with Preferred IFR
Routes but may be listed as such as they do
accomplish essentially the same purpose.
(See PREFERRED IFR ROUTES.)
PREFERRED IFR ROUTES
−
Routes established
between busier airports to increase system efficiency
and capacity. They normally extend through one or
more ARTCC areas and are designed to achieve
balanced traffic flows among high density terminals.
IFR clearances are issued on the basis of these routes
except when severe weather avoidance procedures or
other factors dictate otherwise. Preferred IFR Routes
are listed in the Chart Supplement U.S. If a flight is
planned to or from an area having such routes but the
departure or arrival point is not listed in the Chart
Supplement U.S., pilots may use that part of a
Preferred IFR Route which is appropriate for the
departure or arrival point that is listed. Preferred IFR
Routes are correlated with DPs and STARs and may
be defined by airways, jet routes, direct routes
between NAVAIDs, Waypoints, NAVAID radials/
DME, or any combinations thereof.
(See CENTER’S AREA.)
(See INSTRUMENT DEPARTURE
PROCEDURE.)
(See PREFERENTIAL ROUTES.)
(See STANDARD TERMINAL ARRIVAL.)
(Refer to
CHART SUPPLEMENT U.S.
)
PRE-FLIGHT PILOT BRIEFING
−
(See PILOT BRIEFING.)
PREVAILING VISIBILITY
−
(See VISIBILITY.)
PRIMARY RADAR TARGET
−
An analog or digital
target, exclusive of a secondary radar target,
presented on a radar display.
PRM
−
(See AREA NAVIGATION (RNAV) GLOBAL
POSITIONING SYSTEM (GPS) PRECISION
RUNWAY MONITORING (PRM) APPROACH.)
(See PRM APPROACH.)
(See PRECISION RUNWAY MONITOR
SYSTEM.)
PRM APPROACH
−
An instrument approach
procedure titled ILS PRM, RNAV PRM, LDA PRM,
or GLS PRM conducted to parallel runways
separated by less than 4,300 feet and at least 3,000
feet where independent closely spaced approaches
are permitted. Use of an enhanced display with
alerting, a No Transgression Zone (NTZ), secondary
monitor frequency, pilot PRM training, and
publication of an Attention All Users Page are
required for all PRM approaches. Depending on the
runway spacing, the approach courses may be parallel
or one approach course must be offset. PRM
procedures are also used to conduct Simultaneous
Offset Instrument Approach (SOIA) operations. In
SOIA, one straight
−
in ILS PRM, RNAV PRM, GLS
PRM, and one offset LDA PRM, RNAV PRM or
GLS PRM approach are utilized. PRM procedures
are terminated and a visual segment begins at the
offset approach missed approach point where the
minimum distance between the approach courses is
PCG P
−
4