Garmin Diamond DA40, Maintenance Manual

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G1000/DA40 System Maintenance Manual Page 2-5
190-00303-03 Revision 6
2.1.6 GDC 74A Digital Air Data Computer
The Garmin GDC 74A provides digital air data computations to the G1000 system. The unit is mounted
horizontally behind the instrument panel and is fastened to a sheetmetal rack. Power is received from the
‘Essential’ bus. The GDC 74A connects to existing pitot/static ports as shown in Figure 2-2 and Figure
2-6.
2.1.7 OAT Probe
The Garmin GTP 59 OAT Probe provides the GDC 74A with air temperature data. The OAT probe is
mounted to the bottom starboard side of the DA 40 fuselage as shown in Figure 2-3.
Figure 2-3. GTP 59 OAT Probe