UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT 1
Rev.
8
13-1
Jan
15/19
CHAPTER 13
GTX 345 ADS-B TRANSPONDER
SECTION 1
SYSTEM DESCRIPTION
1-1. System
Description
A. The GTX 345 ADS-B Transponder is installed as part number 28-22028-3. The
components of the GTX 345 installation include the GTX 345 unit installed in the avionics
console, altitude encoder, and a bottom-mounted antenna.
NOTE
When combined, the Garmin GTX 345 with Extended Squitter (ES) and
the Garmin GTN 650 GPS/NAV/COM have been shown to fully comply
with AC 20-165A and 14 CFR 91.227 when installed in accordance with
Garmin’s installation instructions. This configuration will be
compliant with the 2020 ADS-B Out mandate defined in 14 CFR 91.225.
B. For ADS-B Out system functionality, the GTX 345 is configured with the extended squitter
(ES) feature and is interfaced with the GTN series navigator for position input and an
altitude encoder for barometric altitude input. The GTX 345 performs the following ADS-B
Out functions: Transmission of ADS-B Out data on 1090 extended squitter (1090ES)
(1090 MHz), Integration of data from internal and external sources to transmit data as
required per 14 CFR 91.227, and Pressure Altitude Broadcast Inhibit.
C. For ADS-B In system functionality, the GTX receives ADS-B In data on 1090 MHz and
UAT (978 MHz) and provides ADS-B traffic information and alerting to the pilot via an
optional interfaced display.
D. The GTX 345 may also be interfaced to other equipment such as an audio panel or VOX
ICS and an OAT probe.
E. Power to the GTX 345 installation is provided via the
XPNDR
circuit breaker (CB33) (3
Amp) located on the switch/circuit breaker panel.
F. Refer to the F-28F/280FX Rotorcraft Flight Manual Supplement 28-AC-081 for GTX 345
limitations and basic operation instructions.
G. The following component listed in Table 13-1 is to be operated and maintained I/A/W the
current vendor’s instructions to ensure the continued airworthiness of the aircraft.
Table 13-1. Vendor Manuals
Component Publication
Vendor
GTX 345 Transponder
GTX 3X5 Part 27 AML Maintenance
Manual, Document No. 190-00734-21,
latest revision
Garmin International, Inc.
1200 East 151
st
Street
Olathe, KS 66062
Tele: (913) 397-8200
Fax: (913) 397-8282
www.garmin.com
GTX 335/345 Series Pilot’s Guide,
Document No. 190-01499-00, latest
revision
GTX 3X5 Installation Manual, Document
No 190-01499-02, latest revision
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