
Page 2-4 G1000 System Maintenance Manual – Diamond DA40/40F
Revision G 190-00545-01
2.2.5 GTX 33 Mode S Transponder
The Garmin GTX 33 provides Mode A, C, and S altitude and position reporting information to the G1000
system.
• Aircraft with GIA 63W P/N 011-01105-00 or 011 01105-01, the unit is mounted in the remote
avionics enclosure below the baggage compartment.
• Aircraft with GIA 63W P/N 011-01105-20, the unit is mounted on the outboard side of the
remote avionics enclosure below the baggage compartment.
Power is received from the ‘Essential’ bus. The GTX 33 interfaces with the existing transponder antenna.
2.2.6 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 rack. Power is received from the ‘Essential’
bus. The GDC 74A connects to existing pitot/static ports.
2.2.7 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.
2.2.8 GRS 77 Attitude & Heading Reference System
The Garmin GRS 77 AHRS provides attitude and heading information to the G1000 system. The unit is
mounted remotely in the baggage compartment, to the starboard side of the remote avionics enclosure.
Power is received from the ‘Essential’ bus. The GRS 77 interfaces with and provides power to the
GMU 44 Magnetometer. The GRS 77 supplies attitude and heading information directly to the PFD,
MFD, and to both GIAs.
2.2.9 GMU 44 Magnetometer
The GMU 44 provides horizontal and vertical magnetic field information to the GRS 77 AHRS. This
allows heading to be calculated and provides assistance during AHRS alignment. The GMU 44 is
mounted beneath the starboard wing.
2.2.10 GDL 69A (Optional)
The GDL 69A provides optional XM Radio weather and music entertainment through means of a
dedicated satellite data link. The GDL 69A is mounted in the remote avionics enclosure. Power to the
GDL 69A is received from the ‘Main Avionics’ bus. The GDL 69A sends weather data through the
HSDB bus to the MFD, where the data link interface is controlled. Digital audio is sent directly to the
GMA 1347.
2.2.11 Remote Avionics Enclosure
Refer to 005-00304-00, Sheets 2 & 8:
A remote avionics enclosure allows LRUs to be inserted vertically, from above. The enclosure is also
cooled with an avionics fan and duct assembly. The assembly is grounded to an existing grounding
station using a field-fabricated aluminum ground strap. Two braided grounding straps are also attached to
the GRS 77 rack from the enclosure. A Comant diplexer is installed on the enclosure as shown. A field-
fabricated component bracket with resistors, voltage suppressors and attached wiring is fastened to the
forward portion of the enclosure.
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