Tis System Capabilities; Mutual Suppression Pulses - Garmin GTX 33 Installation Manual

1.3.1.1 Installation Approval of Version 1 ADS-B Systems
According to AIR-130 Policy Memo 'Approval for ADS-B Out Systems', dated August 30, 2010, the FAA
has suspended field approvals of Version 2 ADS-B Out equipment. At the time of this publication, there is
currently no FAA policy addressing field approvals of Version 0 or Version 1 systems. GTX 33 w/ES
transponders with Version 1 ADS-B remain eligible for field approval.
There are three options for installers wanting to install GTX 33 w/ES transponders:
1. Installers may elect to disable the ADS-B Extended Squitter function, as described in Section
5.2.16, until the ADS-B Version 2 compliant software update is available from Garmin.
2. Installers may obtain a Supplemental Type Certificate (STC) for the GTX 33 with the
Version 1 ADS-B Extended Squitter activated.
3. Installers may obtain a field approval with the Version 1 ADS-B Extended Squitter activated.
EASA AMC 20-24 compliance matrix provided in Appendix B may be used to assist installers in
showing compliance to the AMC requirements. This data together with Form 337 may be used for
approval by the appropriate FSDO inspector.

1.4 TIS System Capabilities

Traffic Information Service (TIS) provides a graphic display of traffic advisory information in the cockpit
for non-TCAS equipped aircraft.
TIS is a ground-based service providing relative location of all transponder equipped aircraft within a
specified service volume. The TIS ground sensor uses real time track reports to generate traffic
notification.
Traffic display is available to aircraft equipped with a Mode S data link such as the Garmin GTX 33
transponder. Traffic can then be displayed on a Garmin GDU Primary Flight Display, GMX 200 (MX20)
Multifunction Display, GNS 480 (CNX80), GTN 6XX/7XX or other compatible display unit.
Surveillance data includes all transponder equipped aircraft within the coverage volume. Aircraft without
an operating transponder are invisible to TIS. TIS displays traffic within seven nautical miles from 3000
feet below to 3500 feet above the requesting aircraft.

1.5 Mutual Suppression Pulses

Other equipment on board the aircraft may transmit in the same frequency band as the transponder, such as
DME or another transponder. Mutual suppression is a synchronous pulse that is sent to the other equipment
to suppress transmission of a competing transmitter for the duration of the pulse train transmission. The
transponder transmission is suppressed by an external source and other equipment on board is suppressed
by the GTX 33 transponder. This feature is designed to limit mutual interference.
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GTX 33 Installation Manual
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