G1000 NXi System Maintenance Manual Page 15
King Air 300 Series Revision 1
190-00716-N1
Digital Air Data Computer (2) (optional)
The optional Garmin GDC 7400 air data computers may be installed along with AHRS units in
lieu of GSU 75B(s). The GDC(s) compile information from the pitot/static system and outside
air temperature (OAT) sensors to provide digital air data computations to the G1000 system.
The GDC communicates with the GIA 63W, GDU 1050A, and GRS 77/7800 using ARINC 429
digital interface. The unit is mounted behind the instrument panel. GDC 1 also communicates
using ARINC 429 with the GDU 1550 MFD. GDC 1 receives primary electrical power from the
Essential Bus and a secondary power supply from Dual Fed Bus No. 1. GDC 2 receives power
from Dual Fed Bus No. 2. GDC 1 and GDC 2 connect to existing pitot/static ports. Refer to
Figure 2-27 for a schematic of the aircraft’s pitot/static system and its connections to the G1000
STC installed equipment.
IMPORTANT!
Aircraft modified by this STC are eligible to be approved for RVSM operation.
RVSM critical maintenance instructions contained in this document must be
followed in order to guarantee performance within RVSM specifications.
Figure 2-10, GDC 7400 Air Data Computer
OAT Probe (2)
The Garmin GTP 59 OAT Probes provide the GSU 75B or optional GDC 7400 with outside air
temperature data. The OAT probes are mounted to the bottom of the fuselage at F.S. 113.5.
Figure 2-11, OAT probe
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