Garmin GTX 32 Installation Manual page 35

APPENDIX A
A.1 Static Test Loading
This appendix includes information necessary for testing load-carrying capabilities of equipment
mounting structures, such as shelves, mounting plates and mounting brackets, used to mount the GTX 32
remote mounting tray.
Baggage compartments and cabins or cockpit floors are good mounting platforms providing the floor
attachments meet the strength requirements. If support racks, brackets or shelves need to be fabricated,
they should be fabricated and attached to the aircraft structure in accordance with the methods outlined in
AC 43.13-2A Chapter 2. After the structure is installed, it should be tested as outlined in AC 43.13-2A
Chapter 1 to verify that it is capable of supporting the required loads.
The GTX 32 installation must be capable of withstanding the Ultimate Load Factors listed in Table A-1
for at least 3 seconds in each direction specified without damage or permanent deformation. Note that
these required loads differ somewhat from those normally required for equipment installations.
Since the combined weight of the GTX 32 and its equipment mounting rack and connector is 3.4 lbs, the
static loads which must be applied (Load Factor x 3.4 lbs.) will be as follows:
Direction of Force
DOWNWARD
UPWARD
SIDEWARD
FORWARD
A.2 Determining Static Load Capability
A recommended method of determining the static load capability is as follows:
1. Mark and drill the holes where the GTX 32 equipment rack will be mounted.
2. Install four 8-32 machine screws (MS35206, AN526 or equivalent) in the four holes which
will be used to mount the GTX 32 equipment rack using washers, nuts and nutplates to
mount the equipment rack to the mounting surface. Note that some means of locking
fastener must be used, e.g. either lock nuts or steel nuts with lock washers.
3. For testing downward loading, place shot bags or other suitable weights totaling 22.5 pounds
within the footprint outlined by the four screw holes (assuming the mounting surface is
horizontal) or use a calibrated force gauge at the location of the center of gravity when the
unit is mounted.
4. Verify there is no damage or permanent deformation of the structure after 3 seconds.
GTX 32 Installation Manual
190-00303-60
CONSTRUCTION AND VALIDATION OF STRUCTURES
Table A-1. Static Test Load
Load Factor
6.6 G
6.0 G
4.5 G
18.0 G
Static Test Load
(Load Factor x GTX 32 Weight)
(6.6 x 3.4) = 22.5 lbs.
(6.0 x 3.4) = 20.4 lbs.
(4.5 x 3.4) = 15.3 lbs.
(18.0 x 3.4) = 61.2 lbs.
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