A-A-0051858(DM)
Each plate shall be equipped with 1 inch (2.54 cm) layer of flexible, 2 pound density, polyethylene foam NSN 8135-01-250-0472, conforming to Federal Specification PPP-C-1752B. This layer of cushioning shall be affixed to the end, side, top and bottom interior surfaces of the case in order to fill all indentations and voids created by the ribs within the vertical and horizontal planes between the case interior surface and the interior framework. This cushioning shall be affixed as a single, squared off piece to each void and indentation of the case walls with pressure sensitive adhesive in such a manner as to form a secure bond, but not so permanent a to preclude replacement.
Each case shall have an interior framework in accordance with DPSC drawing 24539, constructed of 3/16 inch (0.48 cm) and 1/8 inch (0.32 cm) American Standard Construction grade aluminum affixed to the interior of the case. The framework shall extend from the bottom interior surface to the base of the upper lip of the parting line (Vertical dimensions ± 1/4 inch) and from the interior edge of each side and the interior edge of each end (horizontal dimensions). The framework shall be designed and constructed as to provide compartments in a 1 inch (2.54 cm) increment in the 30 inch (76.2 cm) dimension and will be adjustable upon demand without the use of tools. The interior compartment shall be able to accommodate 33 pounds (14.9 kg) of instrument and be self-supporting. Each compartment shall not have more than 1/16 inch (0.16 cm) change in dimension in any direction for 1 year.
Each case shall be provided with 2 rigid dividers which shall be constructed of 3/16 inch (0.48 cm) thick American Standard Construction grade aluminum in accordance with DPSC drawing 24539. These dividers shall be able to be locked into the case interior framework without the use of tools. They shall be adjustable to any 1 inch (2.54 cm) increment in the same manner. The dividers shall be self-locking in all direction and will extend from the full depth of the case to 2 inches (5.08 cm) above the parting line ± .25 inch (0.64 cm).
Each divider shall be equipped with a layer of 1 inch (2.54 cm) flexible, 2 pound density, polyethylene foam, NSN 8135-01-250-0472 affixed with pressure sensitive adhesive to each side of the divider to form a secure bond but not so permanent as to preclude replacement.
In addition to the layer of foam specified previously to fill the indentations and voids created by the ribs, each lid interior shall have the following layers of flexible, 2 pound density polyethylene foam, NSN 8135-01-250-0472, with the pressure sensitive adhesive, that conforms to Federal Specification PPP-C-1752B: A 2 inch (5.08 cm)
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