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Facility Performance  An ILS which provides guidance information from the coverage 
Category II – ILS  limit of the ILS to the point at which the localiser course line 
intersects the ILS glide path at a height of 15 m (50 ft) or less above 
the horizontal plane containing the threshold. (ICAO) 
Facility Performance  An ILS which, with the aid of ancillary equipment where necessary, 
Category III – ILS  provides guidance information from the coverage limit of the 
facility to, and along, the surface of the runway. (ICAO) 
Failure  A loss of function, or malfunction, of a system or part thereof. (JAR 
25) 
Fault Tolerance  The built-in capability of a system to provide continued correct 
execution, i.e. provision of service as specified, in the presence of 
a limited or specified number of equipment faults. 
Flight Visibility  The visibilty forward from the cockpit of an aircraft in flight. (ICAO) 
G 
Ground-Ground  Two-way communications between or with ATS facilities located 
Communications  on the surface of the earth. 
Ground Visibility  The visibility at an aerodrome as reported by an accredited 
observer or by automatic means. (ICAO) 
Gust  The peak wind speed averaged over a 3 second period. (CAP746) 

CAP 670 Air Traffic Services Safety Requirements

H 
Hazard  Any condition, event, or circumstance which could induce an 
incident. (EC 2096/2005) 
Heading  The direction in which the longitudinal axis of an aircraft is pointed, 
usually expressed in degrees from north (true, magnetic, compass 
or grid). (ICAO) 
Height  The vertical distance of a level, a point, or an object considered as a 
point measured, from a specified datum. (ICAO) 
I 
Identification  The situation which exists when the position indication of a 
particular aircraft is seen on a situation display and positively 
identified. (ICAO) 
Information Urgency  The order of display, processing or other action in accordance with 
the sequencing of essential, routine and time-expired data. 
Instrument  Weather precluding flight in compliance with the Visual Flight 
Meteorological  Rules. (ANO) 
Conditions 
Integrity  That quality which relates to the confidence that can be placed in 
the validity of the information provided by a system. 
Integrity Risk  The probability of an undetected failure, event or occurrence within 
a given time interval. 
International Airport  Any airport designated by the Contracting State in whose territory 
it is situated as an airport of entry and departure for international air 
traffic, where the formalities incident to customs, immigration, 
public health, animal and plant quarantine and similar procedures 
are carried out. (ICAO) 
L 
Lines of  A communications link which can be accessed at a particular 
Communication  operating position. Selected lines of communication are those 
available lines which have been selected by the operator for a 
particular mode of operation. 
Luminance  (L or B, Candela Metre–2) In a given direction at the point on a 
surface, is the luminous intensity in that direction, of an 
infinitesimal element of the surface containing the point, by the 
area of the orthogonal projection of this element on a plane 
perpendicular to the direction considered. (Commission 
　
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