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ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT 1
Rev.
8
8-1
Jan
15/19
CHAPTER 8
GTN 650 GPS/NAV/COM
SECTION 1
SYSTEM DESCRIPTION
1-1. System
Description
A. The GTN 650 installation part number is 28-22112-3. The components of the GTN 650
installation include:
(1) GTN 650 unit installed in the radio console
(2) Nav, Com, and GPS antennas
(3) Optional remote NAV AUDIO switch depending on the audio panel system installed
B. The GTN 650 is interfaced with an audio panel or VOX ICS audio system. The GTN 650
may also be interfaced with any of the following equipment options:
(1) GMA 350Hc audio panel for display of marker beacon annunciation and for
Telligence voice command function
(2) GNC/GTR COM/NAV/COM radio to provide serial position information.
(3) GTX transponder for remote operation as an ADS-B Out position source and to
display ADS-B In information
(4) CDI, slaved compass system, EHSI, or an EFIS system to provide a visual
presentation of VOR, GPS, LOC and GS information
(5) Fuel management system
C. The GTN 650 utilizes Navigation, Basemap, SafeTaxi, Terrain and Obstacle databases
for the map display. A Secure Digital (SD) card is used to load and store various types of
data. For basic flight operations, the SD card is required for Terrain, Obstacle, and
SafeTaxi database storage as well as Jeppesen aviation database updates.
D. Power to the GTN 650 is provided via the
COM
circuit breaker (CB44) (5 Amp) and the
NAV/GPS
circuit breaker circuit breaker (CB43) (5 Amp) located on the left side of the
lower console. The
NAV/GPS
circuit breaker also provides power to the CDI.
(1) If the installation includes an additional NAV/COM radio, the circuit breakers are
assigned
COM 1
and
NAV 1/GPS
.
E. Refer to F-28F/280FX Rotorcraft Flight Manual Supplement 28-AC-069
for GTN 650
limitations and basic operation instructions.
1-2. Vendor
Manuals
A. The following components listed in Table 8-1 are to be operated and maintained I/A/W the
current vendor’s instructions to ensure the continued airworthiness of the aircraft.
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