MIL-PRF-5806H
3.3.14 Concentrated load resistance. Each box shall be capable of supporting loaded boxes,
stacked one on top of another, to a minimum height of 20 feet (see 4.4.17).
3.3.15 Distributed load resistance. Boxes shall be capable of withstanding a distributed load of
175 pounds per square foot (see 4.4.18).
3.3.16 Handling provisions. Lifting rings, eyes and lugs, when not in use, shall not project
beyond the dimensions of the box. The minimum inside diameter of rings, eyes, or lugs shall be
three inches (see 4.4.19). Features provided for lifting, tiedown, and towing shall be combined
wherever possible. A four point suspension system for lifting the box shall be incorporated into
the handling provisions.
3.3.16.1. Stacking guides. Stacking guides shall be positioned on box tops to prevent
longitudinal and lateral slippage of stacked boxes. (The drawing in Figure 1 is an example of a
workable stacking guide; the dimensions are for guidance purposes only.) The stacking guide
shall be attached on each end of the box top at locations directly above the end skids. The
centerline through the apex of the stacking guide shall be perpendicular to the lateral centerline of
the box top. When a nesting pattern has been approved for a particular model rotor blade box,
that pattern shall be maintained on all future designs to assure satisfactory nesting of all boxes for
the same model rotor blade (see 4.4.19.1).
3.3.16.2 Bumpers. Bumpers shall be installed in a staggered manner on each side of the blade
box. (The drawing in Figure 2 is an example of an anti-chafing bumper; the dimensions are for
guidance purposes only.) The bumpers shall not come in contact with each other when the blade
boxes are placed along side each other (see 4.4.19.2).
3.3.16.3 Lifting by forklift. The boxes shall be so constructed that a stack of fully loaded boxes,
a minimum of 80 inches high, can be lifted by forklift from the sides without additional blocking
and without deformation (see 6.5) of the box. Two openings, 3 by 19 inches, minimum, spaced
approximately 30 inches center to center, or a 3 by 40-inch opening, minimum, shall be provided
for lifting by forklift. The opening or openings shall be symmetrically positioned about the center
of balance of the loaded box (see 4.4.19.3).
3.3.16.4 Forklift scuff plate. Each container shall be equipped with an externally attached scuff
plate. It shall extend beyond the forklift area in width and shall extend at least half way up the
sides. It shall be constructed so as to protect the sides of the box from damage during forklift
operations (see 4.4.19.4).
3.3.16.5 Hoisting. Suitable lifting rings, eyes, or lugs shall be provided for lifting a fully loaded
box with chains, hooks or ropes by overhead facilities. Lifting shall be done without failure or
deformation of the box (see 4.4.19.5).
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