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GDC 74A – The Air Data Computer (ADC) processes data from the pitot/static system and outside air temperature
(OAT) sensor. The ADC provides pressure altitude, airspeed, vertical speed, and OAT information to the
G1000 System, and it communicates with the primary IAU, displays, and AHRS using an ARINC 429 digital
interface.
• GEA 71 – The Engine Airframe Unit receives and processes signals from the engine and airframe sensors. This
unit communicates with both IAUs using an RS-485 digital interface.
• GTX 33 – The solid-state Transponder provides Modes A, C, and S capability and communicates with both IAUs
through an RS-232 digital interface.
• GRS 77 (2) – The Attitude and Heading Reference System (AHRS) provides aircraft attitude and heading
information via ARINC 429 to both the PFD and the primary IAU. The AHRS contains advanced sensors
(including accelerometers and rate sensors) and interfaces with the Magnetometer to obtain magnetic field
information, with the ADC to obtain air data, and with both IAUs to obtain GPS information. AHRS operation
is discussed in Section 1.4, System Operation.
190-00592-06 Rev. A
Garmin G1000 Pilot's Guide for the Diamond DA40/40F
SYSTEM OVERVIEW
3
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