Garmin GTX 3X5 Series Installation Manual page 196

CS-ASNS SECTION
CS ACNS.D.ADSB.085 Geometric Altitude
CS ACNS.D.ADSB.090 Flight deck interface
CS ACNS.D.ADSB.100 Integrity
190-01499-02
Rev. 9
CS-ACNS DESCRIPTION
a) Geometric Altitude is provided by the
horizontal position and velocity source (see CS
ACNS.D.ADSB.070).
b) Geometric Altitude is transmitted as height
above WGS-84 ellipsoid.
1. The control and display of surveillance data
items is as per CS ACNS.D.ELS.030.
2. A means is provided to indicate the non-
operational status or failure of the ADS-B Out
system without undue delay.
a) The ADS-B Out system integrity is designed
commensurate with a 'major' failure condition
for the transmission of the following
parameters:
1. ICAO 24-bit aircraft address
2. Airborne Horizontal Position - Latitude and
Longitude
3. Airborne Navigation Integrity Category: NIC
4. Airborne/Surface Navigation Accuracy
Category for Position: NACp
5. 5.Airborne/Surface Source Integrity Level: SIL;
6. 6.Airborne/Surface System Design Assurance:
SDA
7. 1090 ES Version Number;
8. Airborne velocity over Ground - East/West and
North/South;
CS-ACNS Compliance Matrix
COMPLIANCE SUMMARY
The GTX 3X5 sources Geometric Altitude from the
selected GPS source, which is also the horizontal
position and velocity source.
The geometric altitude from the approved position
sources is provided as the height above the WGS-84
ellipsoid in the APM (BDS register 0,5) when type
codes 20-22 are transmitted, and in AVM (BDS
register 0,9) as a difference between GPS and BARO
altitude.
Refer to the GTX 335/335R/345/345R ELS CS-ACNS
compliance matrix.
ADS-B Out failure indications are provided on the
GTX front panel, panel annunciators, or to a
compatible control device any time the ADS-B Out
system constitutes a failure.
The GTX 3X5 is designed to meet design assurance
level C which meets the 'major' failure classification
for ADS-B Out. All approved position sources are
designed to meet at least a 'major' failure
classification.
GTX 3X5 Transponder TSO Installation Manual
Page E-15