User Guide

190-00552-00 Rev. A Garmin G1000 Pilot’s Guide for the Columbia 350/400 1-4
SYSTEM OVERVIEW
• GRS 77 (2) – The Attitude and Heading Reference System (AHRS) provides aircraft attitude and heading
information via ARINC 429 to both the PFD and the primary IAU. The AHRS contains advanced sensors
(including accelerometers and rate sensors) and interfaces with the Magnetometer to obtain magnetic field
information, with the ADC to obtain air data, and with both IAUs to obtain GPS information. AHRS operation
is discussed in Section 1.5, System Operation.
• GMU 44 – The Magnetometer measures local magnetic field and sends data to the AHRS for processing to
determine aircraft magnetic heading. This unit receives power directly from the AHRS and communicates with
it via an RS-485 digital interface.
• GDL 69A – The Data Link Satellite Radio Receiver provides real-time weather information to the G1000 MFD
and PFD Inset Map, as well as digital audio entertainment. The Data Link Receiver communicates with the
MFD via a HSDB connection. A subscription to XM Satellite Radio Service is required to enable the GDL 69A
capability.
• GSA 81, GTA 82, and GSM 85 – The GSA 81 servos are used for automatic control of pitch and roll. The GTA
82 Pitch Trim Adapter works with the existing motor to provide automatic pitch trim. These units interface
with each IAU.
The GSM 85 servo mounts are responsible for transferring the output torque of the GSA 81 servo actuators to
the mechanical flight-control surface linkages.