Line Replaceable Units (Lru) - Garmin G1000 Pilot's Manual

SYSTEM OVERVIEW

1.2 LINE REPLACEABLE UNITS (LRU)

• GDU 1040/1044B – The GDU 1040 is used in the Cessna 172 and 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 or 63W Integrated Avionics Unit. The Cessna 182 and 206 use the GDU
1044B, which employs the same features as the GDU 1040 with the additional controls for the Automatic Flight
Control System (AFCS)
• GIA 63/63W (2) – Functions as the main communication hub, linking all LRUs with the PFD. Each GIA 63/
63W contains a GPS receiver, VHF COM/NAV/GS receivers, a flight director (FD) and system integration
microprocessors. The GIA 63W contains a GPS WAAS receiver. Each GIA is paired with a respective GDU
1040/1044B display through Ethernet. The GIAs are not paired together and do not communicate with each
other directly.
• GDC 74A (1) – Processes data from the pitot/static system as well as the OAT probe. This unit provides
pressure altitude, airspeed, vertical speed and OAT information to the G1000 system, and it communicates with
the GIA 63/63W, GDU 1040/1044B, and GRS 77, using an ARINC 429 digital interface. The GDC 74A also
interfaces directly with the GTP 59.
1-2 Garmin G1000 Pilot's Guide for Cessna Nav III 190-00498-01 Rev. A