Operational control. The exercise of authority over the initiation, continuation, diversion or termination of a flight in the interest of the safety of the aircraft and the regularity and efficiency of the flight.
Operator. A person, organization or enterprise engaged in or offering to engage in an aircraft operation.
Pilot-in-command. The pilot responsible for the operation and safety of the aircraft during flight time.
Precision approach radar (PAR). 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 designated to enable pilots of aircraft to be given guidance by radiocommunication during the final stages of the approach to land.
Pressure-altitude. An atmospheric pressure expressed in terms of altitude which corresponds to that pressure in the Standard Atmosphere.*
Primary radar. A radar system which uses reflected radio signals.
Primary surveillance radar (PSR). A surveillance radar system which uses reflected radio signals.
Procedure turn. A manoeuvre 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 procedure.
Profile. The orthogonal projection of a flight path or portion thereof on the vertical surface containing the nominal track.
PSR blip. The visual indication, in non-symbolic form, on a radar display of the position of an aircraft obtained by primary radar.
Radar. A radio detection device which provides information on range, azimuth and/or elevation of objects.
Radar approach. An approach in which the final approach phase is executed under the direction of a radar controller.
Radar clutter. The visual indication on a radar display of unwanted signals.
Radar contact. The situation which exists when the radar position of a particular aircraft is seen and identified on a radar display.
Radar control. Term used to indicate that radar-derived information is employed directly in the provision of air traffic control service.
Radar controller. A qualified air traffic controller holding a radar rating appropriate to the functions to which he is assigned.
Radar display. An electronic display of radar-derived infor-mation depicting the position and movement of aircraft.
Radar identification. The situation which exists when the radar position of a particular aircraft is seen on a radar display and positively identified by the air traffic controller.
Radar map. Information superimposed on a radar display to provide ready indication of selected features.
Radar monitoring. The use of radar for the purpose of providing aircraft with information and advice relative to significant deviations from nominal flight path, including deviations from the terms of their air traffic control clearances.
Radar position indication (RPI). The visual indication, in non-symbolic and/or symbolic form, on a radar display of the position of an aircraft obtained by primary and/or secondary surveillance radar.
* As defined in Annex 8.
Radar position symbol (RPS). The visual indication, in symbolic form, on a radar display, of the position of an aircraft obtained after automatic processing of positional data derived from primary and/or secondary surveillance radar. 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：Rules of the Air and Air Traffic Services(18)
