background image

12/2/21 

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 sepa-
ration 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.) 

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 

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 immedi-
ately 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 clear-
ance surface (OCS). 

c. 

An obstacle beyond 10 NM from an airport/ 

heliport that requires an obstacle departure procedure 
(ODP) to ensure obstacle avoidance. 

(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. 

PCG P