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MIL-S-85510(AS) Restraint buckle.  The restraint harness buckle shall be of the quick-
release type and shall require intentional motion by the occupant to activate it.
The buckle shall be capable of being operated with a gloved hand, as well as with
one finger of either hand, while tension equal to the occupant weight is sup-
ported by the harness.  The force required to release it normally, as well as after
crash loading, shall be not less than 5 pounds nor more than 10 pounds  for the
lift-lever configuration, nor less than 15 or more than 75 inch-pounds for the
rotary buckle configuraiton.  Lift latch models shall be equipped with a light-
weight lanyard 4-1/2 to 5 inches long.  The buckle's mechanism shall not release
any of the restraint system components when subjected to the vibration and impact
loads described in this specification. The buckle shall also be equipped with a
pad attached to its backside to provide a soft interface that distributes loads to
the occupant's torso.  Lap belt and shoulder strap fittings shall be ejected simul-
taneously when the lever is lifted, even when there is no load on the restraint
straps.  The lap belt shall be capable of connection without connecting the shoulder
straps.  The release buckle shall be guarded to prevent jamming or causing inad-
vertent release of the mechanism by clothing or equipment worn by the seat oc-
3.3.7 Headrest.  The seat system shall contain an appropriate headrest assembly
consisting of a padded structure or as a minimum, a fabric or netting configuration
which shall be designed to provide protection of the occupant from potential head/
neck whiplash injury.
3.4 Construction.
3.4.1 Critical members.  All structural members shall be fabricated from as
ductile a material as possible and preferably of materials whose elongation is in
excess of 10 percent.  In the interest of saving weight, critical tensile and bend-
ing members, which, because of other design considerations, cannot be allowed to
appreciably deform plastically, may be designed of higher strength materials having
elongations as low as 4 percent for very thin (less than 0.030 inch thick) sheet
materials.  In all cases, the system shall be designed to avoid brittle failure.
3.4.2 Dissimilar metals. Unless components are suitably protected against
electrolytic corrosion, contact between dissimilar metals shall not be used where
it is feasible to avoid it.  Dissimilar metals are defined in MIL-STD-889.
Castings used in the seat shall conform to MIL-C-6021.
3.4.3 Castings.
3.4.4 Heat treatment.  Heat treatment of aluminum and steel parts shall conform
to MIL-H-6088 and MIL-H-6875, respectively-
3.4.5 Structural connections. Safety factors shall be 5 percent and 10 percent
for shear and tensile bolts, respectively. Bolts less than 0.25 inch in diameter
shall not be used in tensile applications. Riveted joints shall be designed in
accordance with MIL-HDBK-5. Welding shall be in accordance with MIL-W-6873, MIL-W-
8604, MIL-W-45205, MIL-STD-22 and MIL-STD-1261.
3.4.6 Joining and fastening. Fittings and joints requiring disassembly for
maintenance shall be bolted. All thread and stitching used for sering the seat
back and seat bottom shall be in accordance with V-T-295 and FED-STD-751, type 301.,

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