Garmin GDL 90 Installation Manual

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Appendix D – Construction and Validation of StructuresD-2 560-1049-00 Rev B GDL 90 Installation Manual5. Fasten a 36 inch loop of suitable material such as fishing line, braided wire, or other similarmaterial 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 theloop so it exactly matches the first.6. Hook a calibrated force gauge through both loops and apply a sustained pull for at least 3seconds in each of the other three directions (upward, sideward and forward) at the abovecalculated 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 withstandthe test loads. Examine all aircraft stringers, bulkheads and skin surfaces, which may have director indirect contact with the fabricated shelf. If it is determined that no damage or permanentdeformation has occurred, the structure is of sufficient strength and the GDL 90 equipment rackmay be permanently mounted on it.Figure D-2. Upward Static Load TestFigure D-3. Forward Static Load Test

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