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MIL-S-29398C(MC)
3.1 First article.  The components from two complete sling
systems as described in 3.3 shall be submitted for first article
examination and tests.  Unless otherwise specified in the contract,
first articles shall be manufactured using the same methods and
under the same conditions and procedures intended for use on produc-
tion units.  The first articles shall be tested as specified in
Section 4 to determine that, prior to starting production, the
contractor's production methods are capable of yielding sling system
which meet the requirements specified herein.
3.2  Materials.  Except as specified herein and on the applicable
drawings and specifications, materials shall be-selected by the
manufacturer.  Materials selected shall be capable of meeting the
performance requirements specified herein.
*3.3  Design and construction.  The sling system shall consist of
one apex shackle subassembly, four sling legs, four grab links, four
coupling links, and four chain legs manufactured in accordance with
Drawing No. 825029A0000 and this specification.  The sling system
shall be fabricated, assembled, and stowed in accordance with the
drawings and specifications specified herein.  No deviation from the
prescribed dimensions or tolerances is permissible.  The sling
system shall conform to Drawing No. 825029A0000.  Seventeen compon-
ents shall make up a complete sling system; one apex shackle, four
Kevlar Aramid Fiber, or equal chain legs, four coupling links, four
grab links and four chain legs.
*3.3.1  Apex shackle subassembly.  The apex shackle subassembly shall
act as an interface between the Kevlar Aramid Fiber, or equal, sling
legs and the helicopter hook,
*3.3.2  Sling legs,  Each sling leg shall be 3-strand, made of
Kevlar Aramid fiber, or equal, and shall be of a "wire-rope" con-
struction as shown in Drawing No. 825029A2000.  Each of the three
strands shall have a braided dacron, or equal, jacket and the rope
shall be covered with polyolefin, or equal, shrink tubing.  The eye
splices, as described in Drawing No. 825029A2000, shall be covered
with shrink tubing and dacron, or equal, sock, then coated with a
waterbased adhesive emulsion.
*3.3.3  Grab links.  The grab links shall be connected to the
Kevlar Aramid Fiber, or equal, sling legs.  The coupling links
specified in Drawing No. 825029A5000 shall be connected to the grab
links which shall be connected to the chain legs specified in
Drawing No. 825029A4000.
The free ends of the chain legs shall be
passed through or around the load pickup points and secured by the
grab links.  The length of each chain leg shall be adjustable to
the load's requirement.  The working length of the chain leg depends
on which. chain link is secured by the grab link.
3

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