Figure 2-4, Afcs Controller; Figure 2-5, Fms Controller - Garmin G1000 Nxi System Maintenance Manual

GMC 710 AFCS Control Unit
The dedicated AFCS controls on the GMC 710 allow crew control interface with the various
GFC 700 autopilot / flight director functions. GMC 710 controls are discussed in detail in the
G1000 King Air 300 Series Cockpit Reference Guide. The GMC 710 is powered by the No. 1
Triple Fed Bus.
GCU 477 FMS Control Unit
The GCU 477 functions as the primary control interface to the GDU 1550 MFD. The GCU 477
provides alphanumeric, softkey, and flight planning function keys used to interface with the
G1000; the MFD does not possess any knobs or controls other than softkeys. The GCU 477 is
powered by the No. 3 Triple Fed bus. The GCU 477 also provides the crew with the added
functionality of tuning their receivers via the GCU as well as the PFD. Detailed instructions
regarding the controls are discussed in the G1000 Cockpit Reference Guide.
Transponder (2)
The Garmin GTX 33( ), GTX 3000, GTX 345R, or GTX 335R transponders communicate with
the on-side GIA 63W through RS-232 digital interface.
This STC installation allows for installation of two GTX 33 transponders, two GTX 33D diversity
transponders, one of each GTX 33/GTX 33D, two GTX 3000, two GTX 335R, one of each GTX
345R/335R, or one of each GTX 345R/33() transponders. Mixing between the GTX 33 and
GTX 3000 transponders is not permissible. The GTX 345R provides ADS-B In capability.
The GTX 345R also communicates with the G1000 Avionics through an HSDB interface
connected to PFD1. When installed, the GTX 345R communicates and controls the GTS
Processor through the HSDB interface for all TAS/TCAS I operations. The GTX 345R mixes
and coordinates the TAS/TCAS I targets with TIS-B targets to provide one coordinated traffic
display to the crew. The GTX 345R does not support TCAS II. It also communicates with and
controls A429 interface non-Garmin TAS/TCAS I traffic units if installed.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1

Figure 2-4, AFCS Controller

Figure 2-5, FMS Controller

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