190-01115-01
G3X/G3X Touch Installation Manual - GMU 22 Installation
Rev. AC
Page 15-2
15.3 Equipment Available
15.4 Unit Installation
The following guidelines describe proper mechanical installation of the Garmin GMU 22 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 22. Refer to
for wiring considerations and to
for pinouts.
The GMU 22 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 22, observe the following distances from objects or devices that can disturb the magnetic field.
specifies recommended distances from magnetic disturbances for GMU 22 location.
NOTE
If the requirements listed in
cannot be met, a magnetometer interference test
must be performed to ensure proper operation of the G3X system. Refer to the AHRS/
Magnetometer Installation Considerations document (190-01051-00) available from the
Garmin website (
www.garmin.com
)
.
Table 15-1 GMU 22 Part Numbers
Model
Assembly Part
Number
Unit Only Part
Number
Installation Rack
GMU 22
010-01196-00
011-03269-00
No
Table 15-2 GMU 22 Accessories
Item
Garmin P/N
Quantity
GMU 22, Connector Kit
011-00871-10
1
GMU 22 Universal Mount*
011-01779-01
1 (optional)
Installation Rack, GMU 22
115-00481-10
1
*Refer to AHRS Magnetometer Installation Considerations (190-01051-00) from
www.garmin.com
Table 15-3 Contents of GMU 22 Connector Kit (011-00871-10)
Item
Garmin P/N
Quantity
Modified Install Rack
115-00481-10
1
Screw, 6-32x .250, Pan Head Phillips, Brass, w/Nylon
211-60037-08
3
Circular Connector, Female, 9 Ckt
330-00360-00
1
Circular non-Magnetic Backshell
330-90005-01
1
Socket Contact Mil Crp, Size 20
336-00022-00
10