Air traffic control

Air traffic control

An in-airport service that facilitates the safe and orderly movement of aircrafts within and between airports, achieved by interpreting data from radar and weather devices, and by maintaining contact with pilots.

Industry: Aviation

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Air traffic control

Secondary surveillance radar (SSR)

Aviation; Air traffic control

A radar system that requires complementary aircraft equipment (transponder). The transponder generates a coded reply signal in response to transmissions from the ground station (interrogator). Since ...

Radar navigational assistance

Aviation; Air traffic control

The provision of position information, vectors, or track and ground speed checks.

Radial (R)

Aviation; Air traffic control

A magnetic bearing from a VHF omnidirectional range (VOR), tactical air navigation aid (TACAN), or VORTAC facility, except for facilities in the Northern Domestic Airspace (NDA), which may be ...

Prior permission required (PPR)

Aviation; Air traffic control

An expression used to indicate that permission from the appropriate authority must be obtained before certain aeronautical activities can be carried out.

Radio

Aviation; Air traffic control

A general expression applied to the use of radio waves.

Pre-departure clearance (PDC)

Aviation; Air traffic control

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.

Radio altimeter

Aviation; Air traffic control

Radionavigation equipment on board an aircraft that makes use of the reflection of radio waves from the ground to determine the height of the aircraft above the surface of the earth.