User's Manual

TT21/TT22 Transponder Installation Manual 13 July 2009
00560-00 Issue AF
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Trig Avionics Limited Page 49
Quality Indicator (SIL)
6,5
Version Indicator
6,5
Surface Length/Width
6,5
In addition the TEST message with 4096 squawk code information can also be
transmitted to support coordination with ATC radar systems. TEST message
transmission status is an installation option.
In all cases, uncompensated latency due to the transponder is less than 10
milliseconds. Analysis of the system latency should add this to the latency of
the GPS system and the transmission time of the position data from the GPS to
the transponder to determine the overall latency.
12.2 ADS-B Service Levels
ADS-B forms part of the future plans for airspace management, and is being
deployed in certain limited applications. The following summary of the ADS-
B service is current at the date of publication of this manual, but you should be
aware that regulatory changes are taking place in this area, and the most recent
regulatory information should be consulted.
There are currently three levels of service that an ADS-B transmitter can
provide.
Operational ADS-B
Surveillance
EASA has published the certification
requirements for using ADS-B position
information for Air Traffic Control services in a
non-radar environment, AMC20-24. AMC20-
24 includes both technical attributes of the
individual components of an installation and
system attributes for the overall aircraft
installation. AMC20-24 has been adopted as a
base standard for ADS-B surveillance in other
parts of the world, and provides radar-like
separation capabilities between participating
IFR aircraft.