Garmin GTX 3X5 Series Installation Manual page 195

CS-ASNS SECTION
CS ACNS.D.ADSB.055 Simultaneous Operation of
ADS-B Transmit Units
CS ACNS.D.ADSB.060 On-the-ground status
determination
CS ACNS.D.ADSB.070 Horizontal Position and
Velocity Data Sources
CS ACNS.D.ADSB.080 Data Sources as defined by
Mode S Elementary and Enhanced Surveillance
190-01499-02
Rev. 9
CS-ACNS DESCRIPTION
If more than one ADS-B transmit unit is installed,
simultaneous operation of the transmit systems is
prevented.
a) The on-the-ground status is determined and
validated by the ADS-B Out system.
b) The on-the-ground status is not set by a
manual action.
a) The horizontal position is derived from GNSS
data.
b) The GNSS receiver based horizontal position
and velocity data source is approved and
performs, as a minimum, horizontal position
receiver autonomous integrity monitoring
(RAIM) and fault detection and exclusion (FDE).
c) Horizontal velocity data stems from the same
source as horizontal position data.
a) The data source requirements as defined for in
section 2 and 3 of this subpart, are applicable.
CS-ACNS Compliance Matrix
COMPLIANCE SUMMARY
Dual transponder installations are configured by the
installer.
A compatible control device (e.g., GTN 6XX/7XX) or a
compatible external standby input discrete ensures
that only one transponder can be in a state other
than standby.
The GTX 3X5 units automatically transitions the
aircraft mode from airborne to ground-borne and
report surface mode, broadcasting ground-only
information such as aircraft length and width based
on an algorithm within the GTX ADS-B system.
The GTX 3X5 software's air/ground state will be
automatically determined based on emitter category,
remote air/ground state, ground speed, GPS track,
airspeed, squat switch, height above terrain, and
radio altitude when possible. The on-the-ground
status cannot be set my manual action.
Horizontal position data will be derived from
approved GPS sources.
Refer to Garmin GPS source documentation (see
Note 1).
Horizontal velocity data is ground speed and N/S E/W
velocity provided in BDS register (0,6) when on
ground and BDS register (0,9) when airborne. Both
position and velocity are used from the same selected
position source.
Refer to table E-1 and table E-2 of the installation
manual for the GTX 3X5 ELS and EHS CS-ACNS
compliance matrices for Mode S, ELS and EHS data.
GTX 335/335R/345/345R units with software version
2.05 and earlier are not EHS capable units.
GTX 3X5 Transponder TSO Installation Manual
Page E-14