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PROGRAMMABLE INDICATOR DATA PROCESSOR/PIDP - The PIDP is a modification to the AN/TPX-42 interrogator systems currently installed in fixed Radar Approach Control's. The PIDP detects, tracks, and predicts secondary radar aircraft targets. These are displayed by means of computer-generated symbols and alphanumeric characters depicting flight identifications, aircraft altitude, ground speed, and flight plan data. Although primary radar targets are not tracked, they are displayed coincident with the secondary radar targets as well as with the other symbols and alphanumerics. The system has the capability of interfacing with Air Route Traffic Control Centers.
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 (P/CG) - (See Special Use Airspace).
PROHIBITED AREA (JCS) -A specified area within the land areas of a state or territorial waters adjacent thereto over which the flight of aircraft is prohibited. May also refer to land or sea areas to which access is prohibited.
PROHIBITED AREA (NATO, ICAO) - An airspace of defined dimensions, above the land areas or territorial waters of a State, within which the flight of aircraft is prohibited.
PROPOSED BOUNDARY CROSSING TIME/PBCT - 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.
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.
QFE SETTING (ICAO) - A pressure type altimeter with a QFE Setting indicates altitude above the aerodrome providing the setting (Absolute Altitude). (See Altimeter Setting)
QNE SETTING (ICAO) - The QNE Setting is the Standard Altimeter Setting of 29.92 inches. It shows the altitude above the Standard Datum Plane (Pressure Altitude). (See Altimeter Setting)
QNH SETTING (ICAO) - A pressure type altimeter with a QNH Setting indicates altitude above mean sea level (true altitude). (See Altimeter Setting)
QUADRANT - A quarter part of a circle, centered on a navigational aid, oriented clockwise from magnetic North as follows: Northeast quadrant 000-089, Southeast quadrant 090-179, Southwest quadrant 180-269, Northwest quadrant 270-359. (See Altimeter Setting)
QUICK LOOK - A feature of NAS Stage A and ARTS which provides the controller the capability to display full data blocks of tracked aircraft from other control positions.

QUOTA FLOW CONTROL/QFLOW - A flow control procedure by which the Central Flow Control Function (CFCF) restricts traffic to the Air Route Traffic Center area having an impacted airport thereby avoiding sector/area saturation. (See Air Traffic Control Systems Command Center)
RADAR/RADIO DETECTION AND RANGING (P/CG) - A device which, by measuring the time interval between transmission and reception of radio pulses and correlating the angular orientation of the radiated antenna beam or beams in azimuth and/or elevation, provides information on range, azimuth and/or elevation of objects in the path of the transmitted pulses.
(1)
PRIMARY RADAR -A radar system in which a minute portion of a radio pulse transmitted from a site is reflected by an object and then received back at that site, for processing and display at an Air Traffic Control facility.

(2)
SECONDARY RADAR/RADAR BEACON/ATCRBS - A radar system in which the object to be detected is fitted with cooperative equipment in the form of a radio receiver/transmitter (transponder). Radar pulses transmitted from the searching transmitter/receiver (interrogator) site are received in the cooperative equipment and used to trigger a distinctive transmission from the transponder. This reply transmission rather than a reflected signal, is then received back at the transmitter/receiver site for processing and display at an Air Traffic Control facility. (See Transponder, Interrogator)
　
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