CAP 670 Air Traffic Services Safety Requirements

M 
Maintenance  The preservation or restoration of the required system 
performance over the system lifecycle. 
MATS Part 2  The unit specific instructions to controllers produced by the 
Provider of the Air Traffic Control Service. 
May  Used to indicate that the following clause is optional, alternative, or 
permissive. 
Mitigation  Steps taken to control or prevent a hazard from causing harm and 
reduce risk to a tolerable or acceptable level. 
N 
Non-Radar Separation  The separation used when aircraft position information is derived 
from sources other than radar. (ICAO) 
O 
Operational Control  The exercise of authority over the initiation, continuation, diversion 
or termination of a flight in the interest of the safety of the aircraft 
and the regularity and efficiency of the flight. (ICAO) 
Operational  The basic operational need in the aeronautical environment from 
Requirement  the air traffic service perspective. 
P 
Plan Position Indicator  A surveillance display indicating in plan the positions of objects 
producing radar echoes. 
Position Indication  The visual indication, in non-symbolic and/or symbolic form, on a 
situation display, of the position of an aircraft, aerodrome vehicle or 
other object. (ICAO) 
Position Symbol  The visual indication in symbolic form, on a situation display, of the 
position of an aircraft, aerodrome vehicle or other object, obtained 
after automatic processing of positional data derived from any 
source. (ICAO) 
Primary Radar  A surveillance radar system which uses reflected radio signals. 
(ICAO) 
PSR Blip  The visual indication, in non-symbolic form, on a situation display of 
the position of an aircraft obtained by primary radar. (ICAO) 
Provider (of an Air  A legal person nominated by an aerodrome or other authority to 
Traffic Service)  provide an air traffic service. The Provider will usually be a legal 
entity such as a company and it is to this entity that the ANO refers 
in the legal form of a 'person'. 
Provider’s  An individual identified to the CAA by the Provider who is the 
Representative  'Representative' responsible for the management of the Air 
Navigation Services and who will be the focal point for day-to-day 
dealings with the CAA. 

CAP 670 Air Traffic Services Safety Requirements

Q 
QNH  Altimeter sub-scale setting to obtain elevation when on the ground. 
(ICAO) 
Qualitative Processes  Those analytical processes which are subjective and non-numerical 
in manner. 
Quantitative Processes  Those analytical processes which are numerical in manner. 
R 
Radar  A radio detection device which provides information on range, 
azimuth and/or elevation of objects. (ICAO) 
Radar Approach  An approach in which the final approach phase is executed under 
the direction of a controller using radar. (ICAO) 
Radar Clutter  The visual indication on a situation display of unwanted signals. 
(ICAO) 
Radar Contact  The situation which exists when the radar position of a particular 
　
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