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Terms for subject Aviation (2593 entries)

preferential runway	One or more runways designated and published by the airport operator whose selection directs aircraft away from noise-sensitive areas during the initial departure and final approach phases of flight. Designation of preferential runways may be governed by time restrictions, weather, runway conditions, airport layout, aircraft routings or capacity maximization.
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.
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
preliminary report	The communication used for the prompt dissemination of data obtained during the early stages of the investigation.
present position symbol	The display of a target after processing by a radar data processing system
prevailing visibility	The maximum visibility value common to sectors comprising one half or more of the horizon circle
primary force	The flights that are being protected/escorted
primary frequency	The radiotelephony frequency assigned to an aircraft as a first choice for air-ground communication in a radiotelephony network
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
primary radar	A radar system that detects objects by means of reflected radio signals
primary radar	A radar system which uses reflected radio signals.
primary runways	Runways used in preference to others whenever conditions permit.
primary surveillance radar	A radar system that detects objects by means of reflected radio signals
primary surveillance radar	A surveillance radar system which uses reflected radio signals.
printed communications	Communications which automatically provide a permanent printed record at each terminal of a circuit of all messages which pass over such circuit.
prior permission required	An expression used to indicate that permission from the appropriate authority must be obtained before certain aeronautical activities can be carried out
Prist	fuel system icing inhibitor	'More
private advisory station	Private facilities established at controlled aerodromes for use in connection with company business such as the servicing of aircraft, availability of fuel, lodging, etc. The use of private advisory services at controlled aerodromes shall not include information relating to ATC, weather reports, the condition of landing strips, or any other communication normally provided by ATC units.
problematic substance use	The use of one or more psychoactive substances by aviation personnel in a way that: 1. constitutes a direct hazard to the user or endangers the lives, health or welfare of others; and/or 2. causes or worsens an occupational, social, mental or physical problem or disorder.
problematic use of substances	The use of one or more psychoactive substances by aviation personnel in a way that: 1. constitutes a direct hazard to the user or endangers the lives, health or welfare of others; and/or 2. causes or worsens an occupational, social, mental or physical problem or disorder.