DA20-C1 Flight Manual
Supplement 13
Doc # DA202-C1 April 06, 2010 Page S13 - 20
7.2 Avionics – General
The G500 system consists of:
• Garmin Display Unit (GDU) 620 (PFD/MFD)
• Garmin data Computer (GDC) 74A [Air Data Computer (ADC)]
• Garmin Reference System (GRS) 77 [Attitude and Heading Reference System
(AHRS)]
• Garmin Magnetometer Unit (GMU) 44
• Garmin Navigation System (GNS) 430W [Global Positioning System (GPS)
Navigator]
• Garmin Temperature Probe (GTP) 59.
The system presents primary flight instrumentation and navigation. It also provides a
moving map to the pilot through large format displays.
A. GDU 620 Display
This displays the real time True Airspeed calculations and selectable winds aloft data, as
well as airplane ground speed, GPS active waypoint, distance-to-waypoint,
desired/actual track, and more.
In normal operating mode, the Primary Flight Display (PFD) presents graphical flight
instrumentation (attitude, heading, airspeed, vertical speed). The Multi-Function Flight
Display (MFD) normally displays a full color moving map with navigation and flight plan
information, traffic, weather and terrain.
B. GRS 77 AHRS
The GRS 77 is an attitude and heading reference unit that provides aircraft attitude and
flight characteristics information to the GDU 620. The unit contains advanced tilt
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 GPS/WAAS navigator. Actual attitude and heading
information is sent using ARINC 429 digital interface to the GDU 620.
C. GDC 74A ADC
The GDC 74A air data computer receives information from the pitot/static system and
the GTP 59 outside air temperature (OAT) sensor. The GDC 74A is responsible for
providing pressure altitude, airspeed, vertical speed, and OAT information to the G500
system. The GDC 74A provides data to the GDU 620 and GRS 77 using ARINC 429
digital interfaces. The GDC 74A also communicates maintenance and configuration
information to the GDU 620 using an RS-232 interface.
Revision 25 DOT Approved
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