Garmin G3X Installation Manual page 230

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
indicated in Figure C-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 44 Installation Rack with the aircraft's forward direction. Prepare for shelf
installation 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 demonstrated in Figure C-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 C-22. Fill Detail For Corner Radii And Magnetometer Shelf
Page C-14
Revision E
Figure C-21. Example Magnetometer Shelf
G3X Installation Manual – Airframe Specific Installation Guidance
FILL WITH
EPOXY/FLOX
MIXTURE
190-01115-01