User Guide

190-00552-00 Rev. A
Garmin G1000 Pilot’s Guide for the Columbia 350/400
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SYSTEM OVERVIEW
• GIA 63 (2) – The Integrated Avionics Units (IAU) function as the main communications hub, linking all LRUs
with the PFD. Each IAU contains VHF COM/NAV/GS receivers and system integration microprocessors and
is paired with the on-side display via a HSDB connection. The IAUs are not paired together and do not
communicate with each other directly.
• GDC 74 – The Air Data Computer (ADC) processes data from the pitot/static system and outside air temperature
(OAT) sensor. The ADC provides pressure altitude, airspeed, vertical speed, and OAT information to the
G1000 System, and it communicates with the primary IAU, displays, and AHRS using an ARINC 429 digital
interface.
• GEA 71 – The Engine Airframe Unit receives and processes signals from the engine and airframe sensors. This
unit communicates with both IAUs using an RS-485 digital interface.
• GTX 33 – The solid-state Transponder provides Modes A, C, and S capability and communicates with both IAUs
through an RS-232 digital interface.