190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 14-6
14.4.3 Mounting Instructions
After evaluation of the mounting location has been completed and verifying that requirements are met,
assemble the GMU 22 mounting plate kits according to the dimensions given in Figure 14-3
. Install the
unit assemblies.
Mount the GMU 22 to its mounting plate, taking care to tighten the mounting screws firmly. Use of non-
magnetic tools (e.g. beryllium copper or titanium) is recommended when installing or servicing the
GMU 22. Do not
use a screwdriver that contains a magnet when installing or servicing the GMU 22.
The metal components in the GMU 22 connector may slightly affect the magnetic field sensed by the
GMU 22. Place the connector at least 2 inches from the body of the GMU 22 to minimize this effect. After
attaching the GMU 22's connector to its mate in the aircraft wiring, secure the connector in place using
good installation practices. This will make sure that any remaining magnetic effect can be compensated for
using the Magnetometer Calibration (Appendix H.4.4.3
for GDU™ 37X display systems and Section
30.4.8 for GDU 4XX systems).
See Figure 14-2 for minimum recommended clearance for bend radius of the GMU 22 cable.
NOTE
If the GMU 22 is ever removed, the anti-rotation properties of the mounting screws must
be restored. This may be done by replacing the screws with new Garmin part number
211-60037-08. If original screws must be re-used, coat screw threads with Loctite 242
(blue) thread-locking compound, Garmin part number 291-00023-02, or equivalent.
Important: Mounting screws must be brass.
Figure 14-2 GMU 22 Minimum Recommended Clearance
1.57
40
MINIMUM RECOMMENDED CLEARANCE
FOR MINIMUM BEND RADIUS OF THE
GMU 22 CABLE IS 1.57[40] FROM THE
GMU 22 SURFACE
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