Pilot/Controller Glossary Pilot/Controller Glossary  8/15/19 12/31/20  terminates at the approach gate or where the  glideslope or other appropriate minimum altitude is  intercepted.  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 [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.  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  PUBLISHED INSTRUMENT APPROACH PROCEDURE VISUAL SEGMENT- A segment on  an IAP chart annotated as “Fly Visual to Airport” or  “Fly Visual.” A dashed arrow will indicate the visual  flight path on the profile and plan view with an  associated note on the approximate heading and  distance. The visual segment should be flown as a  dead reckoning course while maintaining visual  conditions.  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 Routes.  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.  PROTECTED AIRSPACE- The airspace on either  side of an oceanic route/track that is equal to one-half  the lateral separation minimum except where  reduction of protected airspace has been authorized.  PROTECTED SEGMENT- The protected segment is  a segment on the amended TFM route that is to be  inhibited from automatic adapted route alteration by  ERAM.  PT- PTP- PTS- PWS- (See PREDICTIVE WIND SHEAR ALERT  SYSTEM.)  (See PROCEDURE TURN.)  (See POINT-TO-POINT.)  (See POLAR TRACK STRUCTURE.)  (See POSITION REPORT.)  (See SPECIAL USE AIRSPACE.)  (See ICAO term PROHIBITED AREA.)  PROGRESS REPORT- PROHIBITED AREA- (See OBSTACLE.)  (See OBSTRUCTION.)  PCG P-5 