Gmu 44 Magnetometer; Gdl 69(X) Satellite Data Link Receiver - Garmin G1000 Maintenance Manual

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The GRS 77 is an attitude, heading, and reference (AHRS) LRU that provides aircraft attitude and flight
characteristics information to the displays and GIAs. The unit contains advanced tilt sensors,
accelerometers, and rate sensors. In addition, the GRS 77 interfaces with both the GDC 74(x) Air Data
computer and the GMU 44 magnetometer. The GRS 77 also utilizes GPS signals sent from the GIA
63(x). Attitude and heading information is sent to both GDUs and GIAs from the GRS using ARINC 429
digital data.
2.8

GMU 44 MAGNETOMETER

The GMU 44 magnetometer senses magnetic field information. Data is sent from the GMU to the GRS
for processing to determine aircraft magnetic heading. This unit receives power from the GRS and
communicates with the GRS using RS-485 digital data.
2.9

GDL 69(x) Satellite Data Link Receiver

The GDL 69(x) is an XM Satellite Radio data link receiver that receives broadcast weather data. The
features of the GDL 69A model are the same as the GDL 69 with the addition of audio entertainment.
Weather data and volume control is displayed on the MFD via a high-speed data bus (HSDB) Ethernet
connection. The GDL 69A interfaces with the GMA for amplification and distribution of the audio
signal.
G1000 System Maintenance Manual
190-00907-00
Figure 2-8. GMU 44 Magnetometer
Figure 2-9. GDL 69(x) Satellite Data Link Receiver
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Rev. B