Garmin GTX 3X5 Series Installation Manual page 183

CS-ACNS SECTION
CS ACNS.D.ELS.010 Transponder
Characteristics
(continued)
CS ACNS.D.ELS.015 Data Transmission
190-01499-02
Rev. 9
CS-ACNS ITEM DESCRIPTION
d) The peak pulse power available at the
antenna end of the transmission line of the
transponder is more than 70 W (18.5 dBW)
and not more than 500 W (27 dBW) for
aircraft operating at or below 4 570 m
(15000 ft) with a maximum cruising
airspeed of 90 m/s (175 knots) or less.
a) The surveillance system provides the
following data in the Mode S replies:
1. The Mode A Code in the range 0000 to
7777 (Octal)
2. The pressure altitude corresponding to
within plus or minus 38 m (125 ft), on a 95
per cent probability basis, with the
pressure-altitude information (referenced to
the standard pressure setting of 1013.25
hectopascals), used on board the aircraft to
adhere to the assigned flight profile. The
pressure altitude ranges from minus 300 m
(1 000 ft) to the maximum certificated
altitude of aircraft plus 1 500 m (5 000 ft).
3. On-the-ground status information.
CS-ACNS Compliance Matrix
COMPLIANCE SUMMARY
The GTX 335/335R/345/345R units are a Class 1
transponder meeting the higher requirements identified
in ACNS.D.ELS.010.c, when installed according to the
installation manual.
The GTX 335/335R/345/345R units provide the following:
1. Mode A code provided in DF=5 and 21 replies. Mode
A Code in the range 0000 to 7777 using either the
panel mount push-buttons or a compatible control
device e.g., GTN 6XX/7XX, GX000, GNS 480.
2. Altitude is reported in DF=4 and 20 replies. The
transponder transmits altitude in 100ft increments
from -1000 to 62,700ft or 25ft increments from -
1000 to 50,175ft depending on the source data.
3. CA field in DF=11 or FS field in DF=4, 5, 20, and 21
replies includes airborne state. The GTX units
automatically transition the aircraft state from
airborne to ground-borne and report surface mode
broadcasting ground-only information such as
aircraft length and width. If the aircraft airborne state
is unknown, it will report AIRBORNE with additional
details in DF 11 with CA code of 6 or 7.
GTX 3X5 Transponder TSO Installation Manual
Page E-2