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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