Garmin G900X Pilot's Manual - page 14
Garmin G900X Pilot’s Guide
190-00726-00 Rev. A
1-2
SYSTEM OVERVIEW
1.1 LINE REPLACEABLE UNITS
•
GDU 1040
(2) – The left-hand GDU is configured as a Primary Flight Display (PFD) and the right-hand GDU
as a Multi Function Display (MFD). Both 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.
•
GIA 63W
(2) – The Integrated Avionics Units (IAU) function as the main communication hubs, linking all
LRUs with the on-side display. Each IAU contains a GPS WAAS receiver, VHF COM/NAV/GS receivers, and
system integration microprocessors, and is paired with the on-side display via HSDB connection. The IAUs are
not paired together and do not communicate with each other directly.