MIL-DTL-55507F(CR)
3.1.2
Level B.
3.1.2.1 Cleaning, drying, preservative application and unit packing Each
.
shelter and equipment shall be cleaned, dried, preserved, and unit packed as specified
in 3.1.1.
3.2
Packing.
3.2.1
Level A.
3.2.1.1 Crate. Each shelter, unit packed as specified in 3.1, shall be packed
in a crate conforming to MIL-C-3774, (modified) type II, bolted, fully demountable,
skid base. The crate rubbing strips shall be made of nominal 4 in. thick lumber and
shall be approximately the same width as the skids. When crates exceed 100 feet in
length, the rubbing strip located at the center of gravity shall be increased to 34
inches (17 inches on each side of center) and the fork-lift openings on each side of
the 34 inch center strip shall be 23 inches and 12 inches respectively (see figures 1,
2, 3, and 4). As an alternate, shelter systems based on the S-250()/G configuration
may be packed in a create conforming to MIL-C-52950 (modified), type V, style A,
demountable. Load bearing floorboards shall be made of 2 by 4 inch (nominal) lumber.
3.2.1.1.1 Buttress blocking and bracing of shelter in crate Wood blocks, 4 by
.
4 inch stock or two pieces, 2 by 4 inch stock, shall be securely fastened to the skid
base with nails. The wood blocks (figures 3 and 4, item 2) shall be notched when
required, to accommodate the towing eyes, bolts, rivet heads, etc., on the shelter to
allow a full length bearing surface.
3.2.1.1.2 Skids and hold-downs Crate skids shall be equipped with 3/8 inch
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diameter forged steel "U" bolts, 1/2 inch diameter forged steel "eye" bolts, or 1/2
inch diameter forged steel "nut eyes" and 1/2 inch diameter carriage bolts, treated to
resist corrosion. Position the bolts on the skid to effect a 45 degree angle with the
lifting eyes located at the top corners of the shelter. The bolts shall be of
sufficient length to extend through the crate skids and accommodate washers and check
nuts or nut eyes and nuts. After the bolt check nuts have been pulled tight, the bolt
threads shall be upset and coated with a preservative conforming to MIL-C-16173, grade
1, to prevent loosening and corrosion. All check nuts, bolts, and carriage bolt heads
on the underside of the skid shall be countersunk flush to prevent friction or drag.
3.2.1.1.3 Tie-downs
. Attach CGU-1/B cargo tie-downs conforming to MIL-T-27260
as illustrated (see figure 9). Attach the fixed hook assembly to the lifting eyes
located at the top corners of the shelter and secure the opposite end (45 degree angle)
adjustable hook assembly to the hold-downs on the skid base. The straps shall be made
semi-taut by first using the adjusting mechanism for strap length and then the
tensioning mechanism using the procedure specified in MIL-T-27260. When tensioning
operation is completed, wrap the excess strapping around the ratchet/tensioning
mechanism and secure with tape conforming to ASTM D 5486/D 5486M.
3.2.1.1.4 Blocking and bracing of shelter on flat car Blocking, bracing and
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securing of shelters shall be as illustrated (see figures 5 and 6). When
4 inch thick wood is specified, two pieces, 2 by 4 inch stock may be substituted to
facilitate nailing.
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