Garmin GDL 69/69A Installation Manual - Page 60

C-1., Upward Static Load Test, C-2., Forward Static Load Test

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Appendix C - 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 shown for your particular unit and rack. The values are found in Tables C-1 and C-2. 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 69/69A equipment rack may be permanently mounted on it. Figure C-1. Upward Static Load Test Figure C-2. Forward Static Load Test Page C-2 Revision E GDL 69/69A Installation Manual 190-00355-02

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Appendix C – Construction and Validation of Structures
Page C-2
GDL 69/69A Installation Manual
Revision E
190-00355-02
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 shown for your particular unit and rack.
The values are found in Tables C-1 and C-2.
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 69/69A equipment
rack may be permanently mounted on it.
Figure C-1.
Upward Static Load Test
Figure C-2.
Forward Static Load Test