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|  MIL-S-55257C(CR)
along the full length of the castings. These four blocking members shall
be notched or shimmed to contact the trim along the sides of the shelter.
The 4x4 inch blocking shall be nailed to the bed of the flatcar as shown
in figure 1. All other blocking shall be firmly secured as shown in fig-
ure 10 Lashing shall consist of four wire rope slings, each including a
3/8 inch diameter, 6x19, flexible steel, performed wire rope (having a
breaking strength of 10,6OO pounds minimum), a turnbuckle, two hooks,
with thimbles and fasteners as required; the breaking strength of the
sling shall be 9,000 pounds minimum. Before each impact, each sling
shall be taut (600-800 pounds tension).
4.7.2 Shelter shelves shall be loaded with uniformly distributed
dummy loads strapped to the shelves, centrally located, covering at least
50 percent of the shelf area. Shelf loading shall be as follows:
a. AN/ASM-146( ):
80 lbs each on each of the four shelves.
AN/ASM-147( ):
b.
(1) Shelves of roadside racks starting from the bottom
shelf:
180 lbs, 160 lbs, 100 lbs, 40 lbs, and 20 lbs.
(2) Shelves of curbside front rack starting from the shelf
above the dehumidifier: 100 lbs, 70 lbs, and 20 lbs.
(3) Shelves of curbside rear racks starting from the bottom
shelf:
180 lbs, 60 lbs, 50 lbs, and 20 lbs.
4.7.3 Loaded gondola car.
The load in the loaded gondola car shall
be of the following:
a. A coarse size of either coal, crushed stone, gravel, con-
crete or metal scrap (other than sheet metal, metal shavings or other
springy forms of metal).
b. Chunk, slab, block or plate forms of the preceding accept-
able materials, constrained to prevent shifting,
4.8 Drop test
4.8.1 Flat drop. The shelter assemblage shall be lifted 18 inches
from the ground and allowed to fall freely with the skids impacting onto
a hard substantial concrete surface. The test shall be performed once.
Upon completion of this drop, the assemblage shall meet the requirements
of 3.5.
4.8.2 Rotational Drop. The shelter assemblage shall have one skid
(or the knuckles of the skids) resting on a nominal 4-inch high timber.
The outer edge of the opposite skid (or the opposite knuckles of the
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