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PILOT BRIEFING/PRE-FLIGHT PILOT BRIEFING - A service provided by the Flight Service Stations to assist pilots in flight planning. Briefing items may include weather information, NOTAMS, military activities, flow control information and other items as requested.
PILOT IN COMMAND (P/CG, ICAO) - The pilot responsible for the operation and safety of an aircraft during flight time. (Refer to Federal Air Regulations Part 91)
PILOTS AUTO TELEPHONE WEATHER ANSWERING SERVICE/PATWAS - A continuous telephone recording containing current and forecast weather information for pilots. (See Flight Service Station)
PILOT'S DISCRETION - When used in conjunction with altitude assignments, means that Air Traffic Control has offered the pilot the option of starting climb or descent whenever he wishes and conducting the climb or descent at any rate he wishes. He may temporarily level off at any intermediary altitude. However, once he has vacated an altitude he may not return to that altitude.
PILOT WEATHER REPORT/PIREP - A report of Meteorological phenomena encountered by aircraft in flight.
POSITION AND HOLD - Used by Air Traffic Control to inform a pilot to taxi onto the departure runway in take-off position and hold. It is not authorization for take-off. It is used when take-off clearance cannot immediately be issued because of traffic or other reasons. (See Hold, Cleared For Take-off)
POSITION REPORT/PROGRESS REPORT - A report over a known location as transmitted by an aircraft to Air Traffic Control.
POSITION SYMBOL - A computer generated indication shown on a radar display to indicate the mode of tracking.
POSITIVE CONTROL (P/CG) - The separation of all air traffic within designated airspace, by Air Traffic Control. (See Positive Control Area)
POSITIVE CONTROL (JCS, NATO) - A method of airspace control that relies on positive identification, tracking, and direction of aircraft within an airspace, conducted with electronic means by an agency having the authority and responsibility therein.
POSITIVE CONTROL AREA/PCA - ( See Controlled Airspace)
PRACTICE INSTRUMENT APPROACH - An instrument approach procedure conducted by a VFR or IFR aircraft for the purpose of pilot training or proficiency demonstration.
PRECIPITATION - Any or all forms of water particles (rain, sleet, hail, or snow), that fall from the atmosphere and reach the surface.
PRECISION APPROACH PROCEDURE/PRECISION APPROACH - A standard instrument approach procedure in which an electronic glide slope/glide path is provided; e.g., ILS/MLS and PAR. (See Instrument Landing System, Microwave Landing System, Precision Approach Radar)
PRECISION APPROACH RADAR/PAR (P/CG) - Radar equipment in some Air Traffic Control facilities operated by the Federal Aviation Administration, and/or the military service at joint-use civil/military locations and separate military installations, to detect and display azimuth, elevation, and range of aircraft on the final approach course to a runway. This equipment may be used to monitor certain non-radar approaches, but is primarily used to conduct a precision instrument approach (PAR) wherein the controller issues guidance instructions to the pilot based on the aircraft's position in relation to the final approach course (azimuth), the glide path (elevation), and the distance (range) from the touchdown point on the runway as displayed on the radar scope. (See Glide Path) The abbreviation "PAR" is also used to denote preferential arrival routes in ARTCC computers. (See Preferential Routes)
PRECISION APPROACH RADAR/PAR (ICAO) - Primary radar equipment used to determine the position of an aircraft during final approach, in terms of lateral and vertical deviations relative to a nominal approach path, and in range relative to touchdown.
NOTE - Precision Approach Radars are designed to enable pilots of aircraft to be given guidance by radio communication during the final stages of the approach to land.
PREFERENTIAL ROUTES - Preferential routes, (PDRs, PARs, and PDARs) are adapted in ARTCC computers to accomplish inter/intra-facility 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:
　
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