Garmin G3X Installation Manual page 797

3. Measure the fuselage in multiple locations to determine the size of the shelf. The shelf will have
an approximate trapezoidal shape and should have a depth of at least 4.0 in. Cut the shelf from
0.25 in. thick, 2-ply per side prepreg. Cut a 2.50 in. diameter hole in the center of the shelf, as
shown in Figure A-21. Alternately, the 2.50 in. diameter hole can move left or right on the shelf,
so long as there is adequate clearance to install or remove the magnetometer. By placing the hole
in the center of the shelf, the elevator control tube can be used more effectively in a later step to
align the GMU 22 Installation Rack with the aircraft's forward direction. Prepare for shelf instal-
lation by sanding, roughing up, and cleaning all bonding areas on the shelf and fuselage for best
adhesion.
4. Fill gap between sides of fuselage and shelf with epoxy/flox mixture. Be sure to make a radius at
the corners as shown in Figure A-22 to smooth the corners for laying glass in the following steps.
When aligning the shelf, ensure the shelf remains level to within 3° of the pitch and roll axes.
Figure A-22 Fill Detail For Corner Radii And Magnetometer Shelf
190-01115-01 G3X/G3X Touch Installation Manual - Airframe Specific Installation Guidance
Rev. AA
Figure A-21 Example Magnetometer Shelf
FILL WITH
EPOXY/FLOX
MIXTURE
Page A-14