User Guide

190-00571-00 Rev. AGarmin G1000 System Overview for the Beechcraft A36/G36
2-2
SYSTEM OVERVIEW
• GDU 1040/GDU 1043 – The G1000 features two
displays, the GDU 1040 and GDU 1043. The GDU
1040 is a 10.4-inch LCD display with 1024 x 768
resolution and is configured as a Primary Flight
Display. The GDU 1040 displays the Flight Director
command bars, system annunciations and alerts,
pilot-selectable references, and flight information.
The GDU 1043 is configured as a Multi Function
Display which contains the dedicated AFCS keys
and GPS/Navigation controls. The displays com-
municate with each other through a high-speed data
bus (HSDB) Ethernet connection. Each display is
also paired via an ethernet connection.
• GMA 1347 – Installed between the MFD and PFD,
the GMA 1347 integrates NAV/COM digital audio,
intercom system and marker beacon controls. The
GMA 1347 communicates with both GIA 63s using
an RS-232 digital interface. The GMA 1347 also
controls manual display reversionary mode.
• GIA 63 – There are two GIA 63s. The GIA 63 func-
tions as a main communication hub, linking all LRUs
with the PFD and the MFD displays. Each GIA 63
contains a GPS receiver, VHF COM/NAV/GS receiv-
ers, and system integration microprocessors. Each
GIA 63 is paired with a respective display through
an ethernet connection. The GIAs are not paired
together and do not communicate with each other
directly.
Each GIA 63 also contains the AFCS software
which controls the Flight Director. During normal
operation, the GRS 77 AHRS and GDC 74A Air Data
Computer send attitude and air data information
to the GIA 63s. This information, combined with
GPS and other system data, is used by the Flight
Director and Autopilot. Flight Director commands
are calculated within the #1 GIA 63 and are sent to
the PFD for display and mode annunciation. Flight
information is also sent to the GSA 81 servos for
Autopilot operation. A GIA #1 failure results in the
loss of the AFCS system. Any GIA 63 failure results
in loss of the Autopilot function.
• GRS 77 – The GRS 77 is an Attitude and Heading
Reference System (AHRS) that provides aircraft
attitude and heading information to both the
G1000 displays and the GIA 63s. The unit contains
advanced sensors, accelerometers and rate sensors.
In addition, the GRS 77 interfaces with both the
GDC 74A Air Data Computer and the GMU 44
Magnetometer. The GRS 77 also utilizes GPS signals
sent from the GIA 63. Attitude and heading infor-
mation is sent using an ARINC 429 digital interface
to both GDU 1040s and GIA 63s. AHRS modes of
operation are discussed later in this document.
• GMU 44 – The GMU 44 Magnetometer measures
local magnetic field information. Data is sent to
the GRS 77 AHRS for processing to determine air-
craft magnetic heading. This unit receives power
directly from the GRS 77 and communicates with
the GRS 77 using an RS-485 digital interface.