MIL-DTL-44117B
shall be securely clinched without cutting the adjacent material, and no more than two splits shall
occur in the button on the eyelet barrel.
3.6.8 Finish of hardware. Hardware components specified to be finished black on the
applicable drawings shall be uniformly coated and free from flaking.
3.6.9 Finish of helmet shell and attachment of edge beading.
3.6.9.1 Outside surface preparation. Prior to attachment of edge beading and application of
protective coating, all permissible surface gaps and pits on the outside surface of the helmet shell
shall be filled with epoxy resin composition to provide a smooth and continuous surface. Cutting
and filling of blisters of any size shall not be permitted. The outside surface of the shell shall be
prepared for coating as required in order to meet the performance requirements specified in 3.7.7.
If abrasion is included in surface preparation, abrading to the point where the aramid cloth fibers
become visibly cut and raised shall be prohibited and dust from the abrading operation shall be
completely removed before application of the coating. The prepared surface shall not be allowed
to become contaminated by oil, grease, dust or other foreign matter prior to coating.
3.6.9.2 Attachment of edge beading. The edge beading shall be attached to the helmet shell as
specified on Drawing 8-2-601 and 8-2-607. The beading shall be attached after the outside surface
of the helmet shell has been prepared for finishing as specified in 3.6.9.1.
3.6.9.3 Coating of helmet shell outer surface. Following the surface preparation specified in
3.6.9.1 and attachment of edge beading specified in 3.6.9.2, the coating specified in 3.5.3 shall be
applied to the outside surface of the helmet shell. The coating shall completely and uniformly
cover the shell surface. A second coat of the same coating containing the texturing aggregate
specified in 3.5.4 shall be applied uniformly on the outside surface of the helmet shell. The
coating shall not be applied to the edge beading. The finishing equipment shall be capable of
applying the texturing aggregate coating mixture without settling of the texturing aggregate,
clogging of nozzle or lines, or other condition that would produce a non-uniform appearance.
3.6.10 Earcups. Seals shall be replaceable and manufactured from polyurethane film.
3.7 Performance
3.7.1 Ballistic resistance. The V50 ballistic limit for each helmet shell shall be not less than
2,150 feet per second when tested as specified in 4.4.5.
3.7.2 Impact resistance. The helmet assembly shall not transmit an impact energy impulse to a
standard head form accelerometer in excess of 75 g-force when tested as specified in 4.4.5.
3.7.3 Sound attenuation. The helmet assembly shall meet the minimum acoustical attenuation
values listed in Table I when tested as specified in 4.4.5.
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