G1000 Flight Instrumentation; Basic G1000 Flight Instrumentation - Garmin G1000 Maintenance Manual

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3.1 G1000 FLIGHT INSTRUMENTATION

The GRS 77 AHRS, GDC 74(x) Air Data Computer, and GMU 44 Magnetometer provide the G1000
system with flight instrument data consisting of aircraft attitude, heading, yaw rate, altitude, airspeed,
vertical speed, and outside air temperature information. This information is displayed on the PFD (and
also on the MFD when it is in reversionary mode).
Primary data outputs from the GRS and GDC are sent directly to the PFD via ARINC 429. Secondary
data paths connect the GRS and GDC to the MFD. Additional communications paths connect the GRS
and GDC to both GIA 63 units, providing multiple redundant communication paths.
The GRS 77 receives GPS data from both GIAs, airspeed data from the GDC, and magnetic heading from
the GMU. Using these three external sources combined with internal sensor data, the GRS accurately
calculates aircraft attitude and heading.
Figure 3-2. Basic G1000 Flight Instrumentation
Page 3-2 G1000 System Maintenance Manual
Rev. B 190-00907-00