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A service provided for the purpose of:
a) preventing collisions:
i) between aircraft, and
ii) in the manoeuvring area between aircraft and
obstructions; and b) expediting and maintaining an orderly flow of air traffic. (EC 549/2004)
A function established with the objective of contributing to a safe, orderly and expeditious flow of air traffic by ensuring that ATC capacity is utilised to the maximum extent possible, and that the traffic volume is compatible with the capacities declared by the appropriate air traffic Service Providers. (EC 549/2004)
Air Traffic Management  The aggregation of the airborne and ground-based functions (air traffic services, airspace management and air traffic flow management)  required to ensure the safe and efficient movement of aircraft during all phases of operations. (EC 549/2004)
Air Traffic Services  The various flight information services, alerting services, air traffic advisory services and ATC services (area, approach and aerodrome control services). (EC 549/2004)
Air Traffic Standards Officer
Air Traffic Service Equipment
Airway Altitude Annex 'n' Approval Articulation Index
ATS Message Handling System
ATS Surveillance Service Authorised by the CAA
Availability
B
Base Turn
Blocking Air Traffic Standards Officers are persons, authorised by the CAA, for the purposes defined within applicable sections of the ANO.
Ground based equipment, including an aeronautical radio station, used or intended to be used in connection with the provision of a service to an aircraft in flight or on the ground which equipment is not otherwise approved by or under [the ANO] but excluding:
a) any public electronic communications network; and b) any equipment in respect of which the CAA has made a
direction that it shall be deemed not to be air traffic
service equipment for the purposes of Articles 205 and
206. (ANO)
A control area or portion thereof established in the form of a corridor. (ICAO)
The vertical distance of a level, a point or an object considered as a point, measured from mean sea level. (ICAO)
The Annex number ‘n’ to the Convention on International Civil Aviation.
The approval, in writing, required under the ANO before a person can provide an air traffic service.
A measure of a communication system’s expected intelligibility, derived from electrical and acoustic measurements on a system. (EUROCAE ED-18)
The set of computing and communication resources implemented by ATS organisations to provide the ATS message handling service. (ICAO Annex 10 Vol III)
Term used to indicate a service provided directly by means of an ATS surveillance system. (ICAO)
An authorisation in writing that amplifies instructions and/or specifies conditions of operation.
The ability of a system to perform within specified limits, a required function under given conditions at a given time.
A turn executed by the aircraft during the initial approach between the end of the outbound track and the beginning of the intermediate or final approach track. The tracks are not reciprocal.
(ICAO) 
NOTE:  Base turns may be designated as being made either in level flight or while descending, according to the circumstances of each individual procedure. 

When a switching matrix cannot make an immediate connection between any input and output it is said to be blocked. This may also be termed 'limited availability'. The opposite of this condition is 'non-blocking' or 'full availability'.
CAP 670 Air Traffic Services Safety Requirements

C 
Chief Executive  The person with the ultimate authority and responsibility for all 
aspects of the control, planning and organisation of the business. 
Code of Practice  A Code of Practice is nominally a guideline document that provides 
　
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