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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. Doc # DA202-C1 April 06, 2010 Page S13 - 20 Revision 25 DOT Approved DA20-C1 Flight Manual DA20-C1 Flight Manual Figure 2 – G500 System Overview with Optional and Required Equipment DA20-C1 Flight Manual DA20-C1 Flight Manual
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