TT21/TT22 Transponder Installation Manual 22 August 2017
00560-00 Issue AP
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Trig Avionics Limited 55
For installations seeking certification to CS-ACNS or other applicable
standards, additional compliance information is available on request from Trig
Avionics Limited.
12.4 TSO C199 TABS Compliance
The TT21 and TT22 transponders are TSO C166b compliant ADS-B
transmitters. When connected to an appropriate TSO C199 Class B GPS
position source all transmitted ADS-B data complies with section A1.2.5 of
TSO C199.
The Traffic Awareness Beacon System (TABS) is intended for voluntary
equipage on aircraft exempted from carrying Automatic Dependent
Surveillance - Broadcast (ADS-B) equipment, such as gliders, balloons and
aircraft without electrical systems. TABS devices provide interoperability with
airborne and ground traffic receivers, but do not meet the ADS-B requirements
defined in 14 CFR § 91.227.
12.5 Automatic Air/Ground Determination
The TT21/22 can report ADS-B surface and airborne messages. The squat
switch input is designed to be used with an automatic air/ground switching
device as defined in section 5.6.7. If no squat switch input is available, the
transponder can automatically determine the air/ground status from the GPS
input.
12.6 ADS-B Support
If you require additional information and data to support an ADS-B installation
then please contact support@trig-avionics.com.
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