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guidance or recommendations. The document is not mandatory 
unless it is made a specific requirement by the regulator. 
Conditional  Maintenance performed after an event or specified condition, 
Maintenance  where the systems function, components, etc. are potentially at 
risk of degradation to the point where the required system 
performance / integrity is compromised. 
Connection Delay  The time between a request to establish a connection with a 
system and the corresponding confirmation of connection. 
Controlled Airspace  Airspace which has been notified as Class A, Class B, Class C, 
Class D or Class E airspace. (ANO) 
D 
Data Communications  The communication equipment, sub-networks and nodes that 
Network  provide for the routing for the transfer of data from one system to 
another. 
Data Communications  An organisation that provides the means to transfer data between 
Service Provider  an ATS facility and aircraft. 
Data Link Application  The implementation of data link technology to achieve specific 
ATM operational functionalities. 
Data Link Service  A set of ATM related transactions, both system supported and 
manual, within a data link application, which have a clearly defined 
operational goal. Each data link application is a description of its 
recommended use from an operational point of view. 
Data Link Service  The organisation with overall accountability for the data link 
Provider  service. This includes the operational requirements of the data link 
system. 
Data Link System  The total set of component parts, equipment, software and 
protocols that is required to provide the data link service. 
Dead Band  A term used to describe the cross-over characteristic on a 360o 
potentiometer or position resolver and optical encoder alignment 
errors. 
Displayed Gust  This is a wind speed, averaged over a 3 second sample, which has 
increased from the 2 or 10-minute mean wind speed by 10 knots or 
more. (CAP 746) 
Distance From  See Aerodrome Traffic Monitor. 
Touchdown Indicator 

CAP 670 Air Traffic Services Safety Requirements

E 
Endorse  Wherever the term 'endorse' is used in connection with safety 
regulation matters this shall be taken to mean acceptance. It is not 
to be confused with an ANO approval where formal methods have 
been applied to secure acceptable regulatory confidence in the 
approval holder. 
Equipment  A non-specific term used to denote any product (which may be 
called by a specific name) designed and built to perform a specific 
function as a self-contained unit or to perform a function in 
conjunction with other units. Units are physical hardware entities, 
possibly with software and firmware. 
Error  A deviation in any system output from normal system output 
parameters. 
Error Detection  A process of testing for non-valid data, bit error or syntax, and 
addressing problems or the event of an error being detected. 
Error Rate  The number of allowable errors detected within a specified time 
interval. 
F 
Facility Performance  An ILS which provides guidance information from the coverage 
Category I – ILS  limit of the ILS to the point at which the localiser course line 
intersects the ILS glide path at a height of 60m (200 ft) or less 
above the horizontal plane containing the threshold. (ICAO) 
　
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