Sidetone A speech signal derived from the transmit path and fed back at a
reduced level to the receive path with negligible delay.
Situation Display An electronic display depicting the position and movement of
aircraft and other information as required. (ICAO)
Special Event A Royal Flight, an airshow, air rally, or other organised event
requiring the establishment of a temporary ATS unit.
Specification A precise technical definition of the required parameters or
performance to be achieved.
Standard Characteristics, methods, principles and practices that can be used
to satisfy a requirement. Standards may be international, national
or company internal Standards may be adopted by a regulated
organisation in response to a regulatory requirement provided that
it is acceptable to the regulator. The regulator may specify a
standard to satisfy part or all of a requirement.
Station Time Marking All recorded information requires a time label. The time reference
or standard used for this shall be the station clock. This will require
the system to be interfaced to the station master clock or station
operational procedures put in place to ensure that the system clock
is within ±5 seconds of the station clock.
Stopway A defined rectangular area on the ground at the end of take-off run
available, prepared as a suitable area in which an aircraft can be
stopped in the case of an abandoned take-off. (ICAO)
Suitably Qualified An engineer with appropriate working experience on the
Engineer equipment or system, or has attended a manufacturer’s course or
similar that covers the areas necessary to provide a competent
response / repair to restore the service.
Surface Movement A surface movement control service using a two-way
Control Service communications facility for the control of vehicles on the
manoeuvring area.
Surveillance Radar Radar equipment used to determine the position of an aircraft in
range and azimuth. (ICAO)
System Failure The inability of a system to fulfil its operational requirements.
Failure may be systematic or due to a physical change.
System Self Test An automatic test procedure that ensures the system is free from
error.
T
Technical Response The time from the issue of a triggering event by the originator /
Time user process to the moment a logical system response is received
by the originator / user process. It therefore includes the technical
data extraction, the composition of the data message, the data
transmission and processing, the logical checks at the destination,
and the transmission and receipt of a response.
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本文鏈接地址：CAP 670 Air Traffic Services Safety Requirements 1(22)
