G1000 NXi System Maintenance Manual
Page 17
King Air 300 Series
Revision 1
190-00716-N1
GMU 44 Magnetometer (2)
The GMU 44 provides horizontal and vertical magnetic field information to the GSU or GRS.
This allows heading to be calculated and provides assistance during ADAHRS/AHRS alignment.
The GMU 44 units are mounted in the tailcone or in the horizontal stabilizer. The 011-00870-20
GMU 44 units may only be installed in the horizontal stabilizer. The GMU 44 units were
modified to account for low clearance installations and have a 90-degree pig-tail harness versus
the straight harness on the 011-08870-10 GMU 44 units. The units receive power directly from
the GSU/GRS units and communicate with the GSU/GRS units via an RS-485 digital interface.
GMU 44 -00 & -10 Unit
GMU 44 -20 Unit
Figure 2-13, Magnetometer
GDL 69A/69A SXM Datalink
The GDL 69A/69A SXM provides the interface to the GWX 68 or GWX 70 weather radar and
optional GDL59 Wi-Fi datalink by acting as a communications hub between the MFD and GWX
68/GWX 70 and GDL 59 via HSDB. The GDL 69A/69A SXM also provides SiriusXM Radio
weather and music entertainment through means of a dedicated satellite data link. The GDL
69A/69A SXM is mounted behind the instrument panel. Power to the GDL 69A/69SXM is
received from Right Gen Avionics Bus. The GDL 69A/69A SXM 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 1347D Audio Panel.
Optional remote control (GRC 10) and remote control transceiver (GRT 10) may be interfaced
with the GDL 69A/69A SXM. Installation of the GRC 10 and GRT 10 is in accordance with
Garmin STC SA01487SE or other approved data. Refer to the approved Instructions for
Continued Airworthiness information for these units. It is recommended that GRT 10 be
powered from the Entertainment Bus.
Figure 2-14, GDL 69A/69A SXM Datalink
Summary of Contents for G1000 NXi
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