| precision approach path indicator |
A visual glide slope indicator (VGSI) consisting of four light units normally situated on the left side of the runway (on both sides of the runway, in the case of the military) in the form of a wing bar and indicating that the aircraft is on slope if the two units nearest the runway show red and the two units furthest from the runway show white, too high if all units show white, and too low if all units show red. |
|
| precision approach procedure |
An instrument approach procedure (IAP) using azimuth and glide path (GP) information provided by an instrument landing system (ILS) a microwave landing system (MLS) or a precision approach radar (PAR) There are three types of precision approaches: (c) precision approach CAT I; (d) precision approach CAT II; and (e) precision approach CAT III. |
|
| precision approach radar |
A high-definition, short-range radar used as an approach aid. This system provides the controller with altitude, azimuth and range information of high accuracy for the purpose of assisting the pilot in executing an approach and landing. This form of navigation assistance is termed a "precision radar approach." |
|
| precision controller |
A duty controller assigned to a precision radar approach control position |
|
| precision radar approach |
An instrument approach procedure (IAP) in which the final approach is conducted in accordance with directions issued by a controller referring to a precision approach radar (PAR) display |
|
| precision runway |
A runway served by visual aids and non-visual NAVAIDs that provide lateral and vertical guidance to the operating minima as specified in precision runway CAT I, precision runway CAT II and precision runway CAT III |
|
| precision runway CAT I |
A runway adequate for instrument approach down to a decision height (DH) lower than 250 ft, but not lower than 200 ft, above height above aerodrome (HAA) or height above touchdown (HAT) and in operating visibility not less than 0.5 SM or runway visual range (RVR) 2600 ft. |
|
| precision runway CAT II |
A runway adequate for instrument approach down to a decision height (DH) lower than 200 ft, but not lower than 100 ft, above height above aerodrome (HAA) or height above touchdown (HAT) and in operating visibility not less than runway visual range (RVR) 1200 ft |
|
| precision runway CAT III |
There are three types of precision runway CAT III: (a) CAT III A: Operations are conducted or intended to be conducted down to a runway visual range (RVR) not less than 600 ft (no decision height (DH) being applicable) CAT III B: Operations are conducted or intended to be conducted down to an RVR not less than 300 ft (no DH being applicable) CAT III C: Operations are conducted or intended to be conducted with no DH and no RVR limitations. |
|
| 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. |
|
| 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. |
|
| 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 |
|
| 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 |
|
