Gdc 74A Air Data Computer; Gea 71 Engine/Airframe Unit - Garmin CIRRUS PERSPECTIVE SR20 Line Maintenance Manual

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The GIA 63W communicates directly with the displays through an HSDB Ethernet connection.
Software and configuration settings are sent from the displays through the GIA 63W to other
LRUs in the system.
2.5 GDC 74A AIR DATA COMPUTER
The GDC 74A provides pressure altitude, airspeed, vertical speed, and OAT information to the
system using data received from the pitot/static system and the OAT probe. The GDC 74A
communicates with the GIA 63Ws, GDU 1240As and GRS 77s using an ARINC 429 digital
interface.
2.6 GEA 71 ENGINE/AIRFRAME UNIT
The unit is a microprocessor based input/output system used to monitor sensor inputs and
drive annunciator outputs for aircraft airframes and engine systems. Sensors include engine
temperature and pressure and fuel measurement and pressure. The GEA communicates
directly with both GIA 63Ws using RS‐485 digital interface. Software and configuration settings
for operation are received through RS‐232 digital interface with the GIA.
Page 2-4
Rev. E
Figure 2‐5. GDC 74A Air Data Computer
Figure 2‐6. GEA 71 Engine/Airframe Unit
Cirrus Perspective™ Line Maintenance Manual
190-00920-00