Pilot/Controller Glossary

3000 feet. Runway spacing can be as close as 750
feet.
(Refer to AIM.)

PROCEDURAL CONTROL [ICAO]" Term used to
indicate that information derived from an ATS
surveillance system is not required for the provision
of air traffic control service.
PROCEDURAL SEPARATION [ICAO]" The separation used when providing procedural control.
PROCEDURE TURN- The maneuver prescribed
when it is necessary to reverse direction to establish
an aircraft on the intermediate approach segment or
final approach course. The outbound course,
direction of turn, distance within which the turn must
be completed, and minimum altitude are specified in
the procedure. However, unless otherwise restricted,
the point at which the turn may be commenced and
the type and rate of turn are left to the discretion of the
pilot.
(See ICAO term PROCEDURE TURN.)

intermediate approach segment of a nonprecision
instrument approach. The profile descent normally
terminates at the approach gate or where the
glideslope or other appropriate minimum altitude is
intercepted.
PROGRESS REPORT-
(See POSITION REPORT.)

PROGRESSIVE TAXI- Precise taxi instructions
given to a pilot unfamiliar with the airport or issued
in stages as the aircraft proceeds along the taxi route.
PROHIBITED AREA-
(See SPECIAL USE AIRSPACE.)
(See ICAO term PROHIBITED AREA.)

PROHIBITED AREA [ICAO]- An airspace of
defined dimensions, above the land areas or territorial
waters of a State, within which the flight of aircraft
is prohibited.
PROMINENT OBSTACLE" An obstacle that meets
one or more of the following conditions:
a. An obstacle which stands out beyond the
adjacent surface of surrounding terrain and immediately projects a noticeable hazard to aircraft in flight.
b. An obstacle, not characterized as low and close
in, whose height is no less than 300 feet above the
departure end of takeoff runway (DER) elevation, is
within 10 NM from the DER, and that penetrates that
airport/heliport"s diverse departure obstacle clearance surface (OCS).
c. An obstacle beyond 10 NM from an airport/
heliport that requires an obstacle departure procedure
(ODP) to ensure obstacle avoidance.

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PROCEDURE TURN [ICAO]- A maneuver in
which a turn is made away from a designated track
followed by a turn in the opposite direction to permit
the aircraft to intercept and proceed along the
reciprocal of the designated track.
Note 1: Procedure turns are designated "left" or
"right" according to the direction of the initial turn.
Note 2: Procedure turns may be designated as
being made either in level flight or while
descending, according to the circumstances of
each individual approach procedure.

PROCEDURE TURN INBOUND- That point of a
procedure turn maneuver where course reversal has
been completed and an aircraft is established inbound
on the intermediate approach segment or final
approach course. A report of "procedure turn
inbound" is normally used by ATC as a position
report for separation purposes.
(See FINAL APPROACH COURSE.)
(See PROCEDURE TURN.)
(See SEGMENTS OF AN INSTRUMENT
APPROACH PROCEDURE.)

PROFILE DESCENT- An uninterrupted descent
(except where level flight is required for speed
adjustment; e.g., 250 knots at 10,000 feet MSL) from
cruising altitude/level to interception of a glideslope
or to a minimum altitude specified for the initial or

(See OBSTACLE.)
(See OBSTRUCTION.)

PROPELLER (PROP) WASH (PROP BLAST)- The
disturbed mass of air generated by the motion of a
propeller.
PROPOSED BOUNDARY CROSSING TIME-
Each center has a PBCT parameter for each internal
airport. Proposed internal flight plans are transmitted
to the adjacent center if the flight time along the
proposed route from the departure airport to the
center boundary is less than or equal to the value of
PBCT or if airport adaptation specifies transmission
regardless of PBCT.
PROPOSED DEPARTURE TIME- The time that the
aircraft expects to become airborne.