System Description; Line Replaceable Units - Garmin G1000 Pilot's Manual

1.1 SYSTEM DESCRIPTION

This document is designed to provide an overview
of the G1000 Integrated Cockpit System as installed in
Cessna Nav III aircraft.
The G1000 system includes the following Line
Replaceable Units (LRUs):
• GDU 1040 Primary Flight Display (PFD)
• GDU 1040 Multi Function Display (MFD)
• GIA 63 Integrated Avionics Units (2)
• GEA 71 Engine/Airframe Unit
• GDC 74A Air Data Computer (ADC)
• GRS 77 Attitude and Heading Reference System
(AHRS)
• GMU 44 Magnetometer
• GMA 1347 Audio System with integrated Marker
Beacon Receiver
• GTX 33 Mode-S Transponder
• GDL 69/69A Data Link
The LRUs are further described in the following
section. All LRUs have a modular design, which greatly
eases troubleshooting and maintenance of the G1000
system. A top-level G1000 block diagram is given in
Figure 1-1. Additional or optional interfaces are depicted
in Figure 1-2.
Please refer to the Pilot's Guide
NOTE:
Appendices
regarding the G1000 LRUs.
190-00498-00 Rev. A
for detailed specifications
Garmin G1000 Pilot's Guide for Cessna Nav III

1.2 LINE REPLACEABLE UNITS

• GDU 1040 – The GDU 1040 features a 10.4-inch
LCD display with 1024 x 768 resolution. The left
display is configured as a PFD and the right display
is configured as an MFD. Both GDU 1040s link
and display all functions of the G1000 system
during flight. The displays communicate with
each other through a High-Speed Data Bus (HSDB)
Ethernet connection. Each display is also paired via
an Ethernet connection with a GIA 63 Integrated
Avionics Unit.
• GMA 1347 – The GMA 1347 Audio Panel integrates
NAV/COM digital audio, intercom system and
marker beacon controls. The GMA 1347 also
controls manual display reversionary mode (red
DISPLAY BACKUP button) and is installed
between the MFD and the PFD. The GMA 1347
communicates with both GIA 63s using an RS-232
digital interface.
SYSTEM OVERVIEW
1-1