Aviation

Aviation

Dealing with vehicles or machines used in flight or propulsion through the air.

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Aviation > Airport

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 ...

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 ...

resolution advisory (RA)

Aviation; Air traffic control

An advisory issued by airborne collision avoidance system (ACAS)/traffic alert and collision avoidance system (TCAS) to alert pilots to potential conflicting air traffic and ...

outer marker (OM)

Aviation; Air traffic control

An LF or VHF facility installed at the site of the outer marker of an instrument landing system (ILS).

traffic advisory (TA)

Aviation; Air traffic control

An advisory issued by airborne collision avoidance system (ACAS)/traffic alert and collision avoidance system (TCAS) to alert pilots to other air traffic that may be in such ...