G1000 Nav III Line Maintenance Manual
Page 1-7
190-00352-00
Rev.
L
1.3.2
Flight Instrumentation
The GRS 77 AHRS, GDC 74A Air Data Computer, and GMU 44 Magnetometer are responsible for providing the
G1000 system with flight instrumentation. Data consist of aircraft attitude, heading, altitude, airspeed, vertical
speed, and outside air temperature information, all displayed on the PFD (data is displayed on the MFD 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 to the MFD. Additional communications paths connect the GRS and GDC to both GIA units,
providing quadruple redundant interface.
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 1-2. G1000 Flight Instrumentation Data Paths
Summary of Contents for G1000 NAV III
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