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Appendix D – Construction and Validation of Structures
5. Fasten a 36 inch loop of suitable material such as fishing line, braided wire, or other similar
material having a breaking strength of at least 150 lbs, diagonally between two of the screws.
Then fasten another loop diagonally between the other two screws, adjusting the length of the
loop so it exactly matches the first.
6. Hook a calibrated force gauge through both loops and apply a sustained pull for at least 3
seconds in each of the other three directions (upward, sideward and forward) at the above
calculated forces (i.e. 38.4 lb upward, 28.8 lb sideward and 115.2 lb forward).
7. Examine the support structure carefully. If there has been damage or permanent deformation,
the structure is not suitable and must be replaced with one which is strong enough to withstand
the test loads. Examine all aircraft stringers, bulkheads and skin surfaces, which may have direct
or indirect contact with the fabricated shelf. If it is determined that no damage or permanent
deformation has occurred, the structure is of sufficient strength and the GDL 90 equipment rack
may be permanently mounted on it.
Figure D-2. Upward Static Load Test
Figure D-3. Forward Static Load Test
D-2
560-1049-00 Rev B
GDL 90 Installation Manual
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