A-A-2523B
The length and height dimensions shall include the frame but
no other components. The thickness dimension shall be an exterior measurement
measured at a point 1 1/2 inches (+/- 1/8 inch) in from the top corner on a
diagonal line connecting either top corner with the opposite bottom corner of
the case.
3.4 Material.
3.4.1 Frame (valence). The lid and bottom sections forming the case
frame shall be magnesium alloy, corrosion resistant steel, aluminum alloy or
glass reinforced nylon 6 injections molded (40% glass fiber reinforced) at the
contractor’s option. For double wall blow molded cases, the valence shall be
formed as a unitary part of the molded shell interior and exterior (and of the
same material) with sufficient strength to withstand deflection when drop
tested and not delaminate, permanently deform, crack, or fracture.
The unitary design valence (blow molded cases) shall include a separate piece
with integral latches and handle mounting mechanism, commonly referred to as a
latch and handle console. The console of blow molded cases shall be
manufactured from thickness metal with a minimum treated for corrosion of 0.027
inch. The metal shall be resistance as part of the finishing process. The color
of the console of blow molded cases shall match the basic color of the case,
black.
Corners of metal frames shall have a 90 degree bend with a radius. Mitered
corners shall not be acceptable. The top and bottom section of the frame shall
be of sufficient width to accommodate through-the-frame mounting of the
interior and exterior hinges, and handle hardware. The perimeter of the top and
bottom sections of the frame shall be of a full or partial tongue and groove,
or overlapping construction. When drop tested the frame shall not be deformed,
abraded, or gouged to the extent that any operation of the briefcase is
hindered. The frame shall not crack, puncture or fracture when drop tested.
3.4.1.1 Corrosion resistant steel. When constructed of corrosion
resistant steel the frame shall have a general purpose polished natural or
black finish.
3.4.1.2 Magnesium alloy. If the frame is constructed of magnesium, it
shall be chemically treated for corrosion resistance and to secure adequate
paint adherence, and then coated with baked enamel having a natural or black
metallic appearance.
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