CAP 670 Air Traffic Services Safety Requirements

Terminal Control Area  A control area normally established at the confluence of ATS routes in the vicinity of one or more major aerodromes. (ICAO) 
Threshold  The beginning of that portion of the runway usable for landing. (ICAO) 
Touchdown  The point where the nominal glide path intercepts the runway. (ICAO) 
NOTE: ‘Touchdown’ as defined above is only a datum and is not necessarily the actual point at which the aircraft will touch the 
runway. 
Track  The projection on the earth’s surface of the path of an aircraft, the direction of which path at any point is usually expressed in degrees from North (true, magnetic or grid). (ICAO) 
Transfer Delay  The time from the issue of a triggering event by the originator user process to the moment the message is received, validated and ready for further treatment at the destination user process. It therefore includes the technical data extraction, the composition of the data message, the data transmission and processing. 
Transponder  A receiver/transmitter which will generate a reply signal upon proper interrogation, the interrogation and reply being on different frequencies. 
V 
Video Mapping  The electronic superimposing of a map or plan on a situation display. 
Visibility  Visibility for aeronautical purposes is the greater of: 
a) the greatest distance at which a black object of suitable dimensions, situated near the ground, can be seen and recognised when observed against a bright background; 
b) the greatest distance at which lights in the vicinity of 1000 candelas can be seen and identified against an unlit background. (ICAO) 
NOTE 1: The two distances have different values in air of a given extinction coefficient and the latter b) varies with the background illumination. The former a) is represented by the meteorological optical range (MOR). 
NOTE 2: The definition applies to the observations of visibility in local routine and special reports, to the observations of prevailing and minimum visibility reported in METAR and SPECI and to the observations of ground visibility. 
Visual Approach  An approach by an IFR flight when either part or all of an instrument approach procedure is not completed and the approach is executed with visual reference to terrain. (ICAO) 
Visual Approach Procedure  A series of predetermined manoeuvres by visual reference, from the initial approach fix, or where applicable, from the beginning of a defined arrival route to a point from which a landing can be completed and thereafter, if a landing is not completed, a go-around procedure can be carried out. (ICAO) 

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Abbreviations

A 
AAIB  Air Accident Investigation Branch. 
ABS  Anti-Blocking System. 
ACC  Area Control Centre. 
ADC  Aerodrome Control. 
ADF  Automatic Direction Finder. 
ADS  Automatic Dependent Surveillance. 
AFPEx  Assisted Flight Plan Exchange. 
AFIS  Aeronautical Flight Information Service. 
AFTN  Aeronautical Fixed Telecommunications Network. 
A/G  Air/Ground. 
AGL  Aeronautical Ground Lighting. 
AI  Articulation Index. 
AIS  Aeronautical Information Service. 
AMC  Acceptable Means of Compliance. 
amsl  Above Mean Sea Level. 
ANO  Air Navigation Order. 
ANSP  Air Navigation Services Provider. 
　
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