Garmin G950 Pilot's Manual page 15

• GDC 74A (1) – 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 G950 System, and it communicates with the primary IAU, displays, and AHRS using an ARINC 429
digital interface.
• GEA 71 (1) – (optional) 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 (1) – The solid-state Transponder provides Modes A, C, and S capability and communicates with both
IAUs through an RS-232 digital interface.
• GRS 77 (1) – The Attitude and Heading Reference System (AHRS) provides aircraft attitude and heading
information via ARINC 429 to both PFDs 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.
190-00870-02 Rev. A Garmin G950 Pilot's Guide for the Pilatus PC-6
SYSTEM OVERVIEW
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