Garmin G3X Installation Manual page 232

Alternately, if the 2.50 in. diameter hole is drilled off of centerline as indicated in Figure C-25,
project a parallel line to the aircraft's centerline reference using the elevator control tube as a
reference line. Mark a parallel line at the offset cutout to create the forward direction reference.
Figure C-25. Alignment Of Magnetometer Cutout With Aircraft's Forward Direction With
Clamp the GMU 44 Installation Rack (115-00481-00) in place above or below the shelf,
whichever corresponds to the side with the centerline reference mark, allowing the inside
diameter of the cutout in the GMU 44 Installation Rack to be concentric with the circular cutout
in the magnetometer shelf. Align the notch on the GMU 44 Installation Rack (indicating forward
direction) with the aircraft centerline mark at the forward end of the shelf. The cutout alignment
needs to be within 0.5° of the aircraft's forward direction.
Address the six holes for the magnetometer install rack as shown in Figure C-26 by either match
drilling or marking the holes as shown. Match drill the magnetometer shelf through the three
countersunk holes found on the Installation Rack. Mark the center of the three mounting screw
holes. Remove the GMU 44 Installation Rack and drill the three marked locations to 0.203 in.
diameter, as these are clearance holes for the GMU 44 Magnetometer unit installation.
The GMU 44 Installation Rack must be set, drilled, and installed after the shelf has been
mounted in the aircraft and cured.
Page C-16
Revision E
MAGNETOMETER SHELF
ELEVATOR CONTROL TUBE
MAINTAIN PARALLEL TO
FORWARD DIRECTION
Offset Magnetometer Cutout
G3X Installation Manual – Airframe Specific Installation Guidance
NOTE
190-01115-01