Garmin GTP 59 GPS Receiver User Manual


 
G3X Installation Manual – GSU 73 Page 4-7
190-01115-01 Revision A
Do not use shock mounting to mount the GSU 73. Shock mounts used for other types of inertial systems
are not acceptable for the GSU 73 AHRS. The mounting system must have no resonance with the unit
installed. Excessive vibration may result in degraded accuracy.
The supporting plate must be rigidly connected to the aircraft primary structure through strong structural
members capable of supporting substantial loads. Avoid areas that are prone to severe vibration.
The GSU 73 should be mounted within 13 feet (4.0 meters) longitudinally and 6.5 feet (2.0 meters)
laterally of the aircraft center of gravity. In cases where the longitudinal distance from the CG is planned
to be greater than 6.5 feet (2.0 meters), it is preferable to mount the GSU 73 forward of the aircraft center
of gravity if possible, to enable better acceleration outputs for autopilot use. The mounting location for
the GSU 73 should be protected from rapid thermal transients, in particular, large heat loads from nearby
high-power equipment.
The GSU 73 must be leveled to within 3.0° of the aircraft level reference, and an aircraft leveling and
offset calibration procedure carried out prior to flight. (This procedure is described in Section 9.)
Alternatively, if the GSU 73 can be guaranteed level to within 0.25° of the aircraft level reference, the
aircraft leveling and offset calibration procedure is not required.
Avoid placing the GSU 73 within 1 inch of magnetically mounted antennas, speaker magnets, or other
strongly magnetic items.
4.7 Unit Installation
For final installation and assembly, refer to the outline and installation drawings shown in Appendix C of
this manual.
1. Assemble the wiring harness and backshell connectors.
2. Assemble the pneumatic hoses and connectors.
3. Mount the unit to a suitable mounting location using #10-32 pan or hex head screws (4 ea) per
the requirements in Section 4.6.
4. Connect backshell connector and hoses.
NOTE
When mounting the GSU 73 to the airframe, it is important to ensure that
fastening hardware is tight for proper unit operation.