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that guide the pilot from the en route segments to the IAF.
POH/AFM. See Pilot’s Operating Handbook/Airplane
Flight Manual.
Point-in-space approach. A type of helicopter instrument
approach procedure to a missed approach point more than
2,600 feet from an associated helicopter landing area.
Position error. Error in the indication of the altimeter, ASI,
and VSI caused by the air at the static system entrance not
being absolutely still.
Position report. A report over a known location as
transmitted by an aircraft to ATC.
Precession. The characteristic of a gyroscope that causes an
applied force to be felt, not at the point of application, but
90° from that point in the direction of rotation.
Precipitation static (P-static). A form of radio interference
caused by rain, snow, or dust particles hitting the antenna and
inducing a small radio-frequency voltage into it.
Precision approach. A standard instrument approach
procedure in which both vertical and horizontal guidance
is provided.
Precision approach path indicator (PAPI). A system of
lights similar to the VASI, but consisting of one row of lights
in two- or four-light systems. A pilot on the correct glide slope
will see two white lights and two red lights. See VASI.
Precision approach radar (PAR). A type of radar used
at an airport to guide an aircraft through the final stages of
landing, providing horizontal and vertical guidance. The
radar operator directs the pilot to change heading or adjust
the descent rate to keep the aircraft on a path that allows it
to touch down at the correct spot on the runway.
Precision runway monitor (PRM). System allows
simultaneous, independent Instrument Flight Rules (IFR)
approaches at airports with closely spaced parallel runways.
Preferred IFR routes. Routes established in the major
terminal and en route environments to increase system
efficiency and capacity. IFR clearances are issued based on
these routes, listed in the A/FD except when severe weather
avoidance procedures or other factors dictate otherwise.
Pressure altitude. Altitude above the standard 29.92" Hg
plane.
Prevailing visibility. The greatest horizontal visibility
equaled or exceeded throughout at least half the horizon
circle (which is not necessarily continuous).
Primary and supporting. A method of attitude instrument
flying using the instrument that provides the most direct
indication of attitude and performance.
Primary flight display (PFD). A display that provides
increased situational awareness to the pilot by replacing the
traditional six instruments used for instrument flight with
an easy-to-scan display that provides the horizon, airspeed,
altitude, vertical speed, trend, trim, rate of turn among other
key relevant indications.
PRM. See precision runway monitor.
Procedure turn. A maneuver prescribed when it is necessary
to reverse direction to establish an aircraft on the intermediate
approach segment or final approach course.
G-15
Profile view. Side view of an IAP chart illustrating the vertical
approach path altitudes, headings, distances, and fixes.
Prohibited area. Designated airspace within which flight of
aircraft is prohibited.
Propeller/rotor modulation error. Certain propeller RPM
settings or helicopter rotor speeds can cause the VOR course
deviation indicator (CDI) to fluctuate as much as ±6°. Slight
changes to the RPM setting will normally smooth out this
roughness.
Rabbit, the. High-intensity flasher system installed at many
large airports. The flashers consist of a series of brilliant
blue-white bursts of light flashing in sequence along the
approach lights, giving the effect of a ball of light traveling
towards the runway.
Radar. Radio Detection And Ranging.
Radar approach. The controller provides vectors while
monitoring the progress of the flight with radar, guiding
the pilot through the descent to the airport/heliport or to a
specific runway.
Radials. The courses oriented from a station.
Radio or radar altimeter. An electronic altimeter that
determines the height of an aircraft above the terrain by
measuring the time needed for a pulse of radio-frequency
energy to travel from the aircraft to the ground and return.
Radio frequency (RF). A term that refers to alternating
current (AC) having characteristics such that, if the current is
input to antenna, an electromagnetic (EM) field is generated
suitable for wireless broadcasting and/or communications.
Radio magnetic indicator (RMI). An electronic navigation
instrument that combines a magnetic compass card with two
　
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