User Guide

190-00552-00 Rev. A Garmin G1000 Pilot’s Guide for the Columbia 350/400 1-2
SYSTEM OVERVIEW
1.2 LINE REPLACEABLE UNITS
• GDU 1040/1042 (2) – The GDU 1040 is configured as a Primary Flight Display (PFD) and the GDU 1042 as
a Multi Function Display (MFD). Both displays feature 10.4-inch LCD screens with 1024 x 768 resolution.
The displays communicate with each other through a High-Speed Data Bus (HSDB) Ethernet connection. Each
display is also paired with an Ethernet connection to an IAU.
• GMA 1347 – The Audio Panel integrates navigation/communication radio (NAV/COM) digital audio, intercom,
and marker beacon controls, and is installed between the displays. This unit also provides manual control of
display reversionary mode (red DISPLAY BACKUP button; see Section 1.5, System Operation) and communicates
with both IAUs using an RS-232 digital interface.
• GCU 476 – The Control Unit provides MFD/PFD and radio tuning control through an RS-232 digital interface