Page 3-2
G300 Installation Manual – GMU 44
Revision A
190-00921-01
3.3
Environmental Specifications
Table 3-2 lists general environmental specifications. For detailed specifications, see the Environmental
Qualification Form (Garmin part number 005-00164-31) for the GMU 44.
Table 3-2. GMU 44 Environmental Specifications
Specification Characteristic
Regulatory Compliance
RTCA/DO-160D Environmental Conditions and
EUROCAE/ED-14D
Unit Software
RTCA/DO-178B Level B
Operating Temperature
Range
-55
°
C to +70
°
C
Altitude 55,000
Feet
3.4
Installation Requirements
3.4.1
Equipment Available
Table 3-3. GMU 44 Part Numbers
Model
Catalog Part
Number
Unit Part Number
Installation Rack
GMU 44
010-00296-00
011-00870-00
No
Table 3-4. GMU 44 Accessories
Item
Garmin P/N
Quantity
Sub Assy, Connector Kit, GMU 44
011-00871-00
1
Installation Rack, GMU 44
115-00481-00
1
3.5
Installation Considerations
The following guidelines describe proper mechanical installation of the Garmin GMU 44 Magnetometer.
The guidelines include requirements for proper location selection in the aircraft, requirements for
supporting structure and mechanical alignment and restriction on nearby equipment.
Fabrication of a wiring harness is required. Sound mechanical and electrical methods and practices are
required for installation of the GMU 44. Refer to Section 1.6 for wiring considerations and to Appendix
A.2 for pinouts.
The instructions needed to assemble the circular connector (190-00313-12) can be downloaded from the
Dealer portion of the Garmin website
www.garmin.com
.
The GMU 44 is an extremely sensitive three-axis magnetic sensor. It is more sensitive to nearby
magnetic disturbances than a flux gate magnetometer. For this reason, when choosing a mounting
location for the GMU 44, observe the following distances from objects or devices that can disturb the
magnetic field. Table 3-5 specifies required distances from magnetic disturbances for GMU 44 location.
