. see also: precision runway
Fr: piste de précision CAT III
pre-departure clearance The electronic delivery of initial IFR clearances via air-ground data link (AGDL) to airline companies with an on-site computer capable of interfacing with ATC and the data link service provider.
. abbreviation: PDC
Fr: autorisation pré-départ
preferential arrival route A specific arrival route from an appropriate en route point to an airport or terminal area. It may be included in a standard terminal arrival (STAR) or a preferred IFR route. Fr: route d’arrivée préférentielle
preferential departure route A specific departure route from an airport or terminal area to an en route point where there is no further need for flow control. It may be included in a standard instrument departure (SID) or a preferred IFR route. Fr: route de départ préférentielle
preferred IFR route A route established between busier airports to increase system efficiency and capacity. IFR clearances are issued on the basis of such routes except when severe weather avoidance procedures or other factors dictate otherwise. Preferred IFR routes are correlated with standard instrument departures (SID) and standard terminal arrivals (STAR) and may be defined by airways, high level airways, or direct routes between NAVAIDs or waypoints, radials or distance measuring equipment (DME) fixes, or any combination thereof. Fr: route IFR préférentielle
preferred runway At an uncontrolled aerodrome, the most suitable operational runway, taking into consideration wind direction and speed, noise abatement restrictions, runway conditions, ground traffic, and any other relevant factor or restriction. Fr: piste préférée
pre-flight pilot briefing Other expression for: pilot briefing present position symbol
The display of a target after processing by a radar data processing system.
.
abbreviation: PPS

.
see also: target

Fr: symbole de position actuelle
prevailing visibility
The maximum visibility value common to sectors comprising one half or more of the horizon circle.
Fr: visibilité dominante
primary frequency The radiotelephony frequency assigned to an aircraft as a first choice for air-ground communication in a radiotelephony network. Fr: fréquence principale
primary means of communication The means of communication that must normally be adopted by aircraft and ground stations as a first choice where alternative means of communication exist. Fr: moyen principal de communication
primary radar Other expression for: primary surveillance radar (PSR)
primary surveillance radar
A radar system that detects objects by means of reflected radio signals.
.
abbreviation: PSR

.
also called: primary radar 

.
see also: radar