G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air Page 2-7
190-00716-01 Revision 4
2.1.9 GDC 7400 Digital Air Data Computer (2)
The Garmin GDC 7400 computers compile information from the pitot/static system and various outside
air temperature (OAT) and awareness sensors and provide digital air data computations to the G1000
system. The GDC 7400 communicates with the GIA 63W, GDU 1040A, and GRS 77 using ARINC 429
digital interface. The unit is mounted behind the instrument panel. GDC 1 receives primary electrical
power from No. 1 Triple Fed Bus and a secondary power supply from Center Bus. GDC 2 receives
power from No. 3 Triple Fed Bus. GDC 1 and GDC 2 connect to existing pitot/static ports. Refer to
Figure 2-24 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 2-8, Air Data Computer
2.1.10 OAT Probe (2)
The Garmin GTP 59 OAT Probes provide the GDC 7400 with air temperature data. The OAT probes are
mounted to the bottom of the fuselage at F.S. 113.5.
Figure 2-9, OAT probe
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