Glossary of Terms

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Aerodrome operating minima

“aerodrome operating minima” means the limits of usability of an aerodrome for:

(i) take-off, expressed in terms of runway visua l range (RVR) and/or visibility
and if necessary, cloud conditions; or

(ii) landing in approach and landing operations with vertical guidance, expressed
in terms of visibility and/or runway visual range (RVR) and decision height or
altitude (DA/H); and

(iii) landing in non-precision approach and landing operations, expressed in terms
of visibility and/or runway visual range, minimum descent altitude or height
(MDA/H) and if necessary, cloud conditions;

Aerodrome reference point

Aerodrome reference point. The designated geographical location of an aerodrome.

Aerodrome traffic density

Aerodrome traffic density.
a) Light. Where the number of movements in the mean busy hour is not greater than 15 per runway or
typically less than 20 total aerodrome movements.

b) Medium. Where the number of movements in the mean busy hour is of the order of 16 to 25 per runway or
typically between 20 to 35 total aerodrome movements

c) Heavy. Where the number of movements in the mean busy hour is of the order of 26 or more per runway or
typically more than 35 total aerodrome movements.

Note 1.C The number of movements in the mean busy hour is the arithmetic mean over the year of the number of
movements in the daily busiest hour.

Note 2.C Either a take-off or a landing constitutes a movement.

Aeronautical beacon

Aeronautical beacon. An aeronautical ground light visible at all azimuths, either continuously or intermittently, to designate a
particular point on the surface of the earth.

Aeronautical chart

Aeronautical chart. A representation of a portion of the Earth, its culture and relief, specifically designated to meet the
requirements of air navigation.

Aeronautical ground light

Aeronautical ground light. Any light specially provided as an aid to air navigation, other than a light displayed on an aircraft.

Aeronautical operational control

Aeronautical operational control (AOC). Communication required for the exercise of authority over the initiation, continuation,
diversion or termination of flight for safety, regularity and efficiency reasons.

Aeroplane reference field length

Aeroplane reference field length. The minimum field length required for take-off at maximum certificated take-off mass, sea
level, standard atmospheric conditions, still air and zero runway slope, as shown in the appropriate aeroplane flight
manual prescribed by the certificating authority or equivalent data from the aeroplane manufacturer. Field length means
balanced field length for aeroplanes, if applicable, or take-off distance in other cases.

Note.C ICAO Annex 14, Attachment A, Section 2 provides information on the concept of balanced field length.


Aircraft earth station (AES). A mobile earth station in the aeronautical mobile-satellite service located on board an aircraft
(see also “GES”).

Ground earth station (GES). An earth station in the fixed satellite service, or, in some cases, in the aeronautical
mobile-satellite service, located at a specified fixed point on land to provide a feeder link for the aeronautical mobilesatellite

Note.— This definition is used in the ITU’s Radio Regulations under the term “aeronautical earth station”. The
definition herein as “GES” for use in the SARPs is to clearly distinguish it from an aircraft earth station (AES), which is a
mobile station on an aircraft.


Afterburning. A mode of engine operation wherein a combustion system fed (in whole or part) by vitiated air is used.

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