Ads-B Capabilities - Garmin GTX 33 Installation Manual

Provision is made for unit software upgrade by means of RS-232 data through rear connector pins. In
installations where the transponder interfaces with a GNS 480 (CNX80) or GTN 6XX/7XX the installation
of an optional connector is highly recommended. If the optional connector is placed in the aircraft,
transponder removal and reinstallation for software upgrade is not required. The software can be changed
while the unit is still mounted inside the aircraft.
The GTX 33 meets Mode S Enhanced Surveillance (EHS) requirements. Mode S Enhanced Surveillance is
used predominantly in European airspace. It provides information consisting of additional aircraft
parameters (see JAA NPA 20-12a) to ground radar systems. Compliance with Enhanced Surveillance may
require additional interface between aircraft systems and the GTX 33.
The GTX 33 and GTX 33D differ from the GTX 33H and GTX 33DH in the qualified DO-160 vibration
categories. See the GTX 33 Environmental Qualification Form (005-00131-03) for details.

1.3 ADS-B Capabilities

The Extended Squitter Enabled GTX 33 provides the capabilities of Automatic Dependent Surveillance-
Broadcast (ADS-B) technology, which improves situational awareness and flight safety. With ADS-B
capabilities, position, velocity, and heading information are automatically transmitted to other aircraft and
ground stations. The current air traffic control system depends on a transponder request for pertinent
aircraft information. ADS-B provides automatic transmission of aircraft information without a request.
NOTE
RS-232 ADS-B Out from a Garmin 400/500 Series WAAS unit with main software version
3.20 or later, or a GPS WAAS source that supports ARINC 743A output is required to
support ADS-B transmissions.
1.3.1 ADS-B Versions
There are three distinct ADS-B versions recognized by regulatory authorities. As show in the table below,
the Garmin GTX 33 w/ES currently supports ADS-B Out 1090MHz Extended Squitter capability meeting
'Version 1' ADS-B system requirements.
NOTE
GTX 33 w/ES transponders with software version 6.20 or earlier are not compliant with
ADS-B version required by the 14 CFR 91.225(a) equipage mandate.
ADS-B
Version
Version 0
Version 1
Version 2*
* Version required by 2020 ADS-B mandate defined in 14 CFR 91.225
GTX 33 Installation Manual
Page 1-2
Table 1-1. ADS-B Versions
GTX 33 w/ES Regulatory Standard/Minimum Performance
Compliant Specification
No Equipment designed to TSO-166 / RTCA DO-260
Yes Equipment designed to TSO-166a / RTCA DO-260A
No Equipment designed to TSO-166b / RTCA DO-260B
190-00906-00
Rev. F