MIL-DTL-87174A(USAF)
TABLE V. Classification of defects, end-item visual examination. - Continued
Visor assembly, lightweight
Edge beading not securely adhered to visor
Pile fastener not securely adhered to visor
Tears, cracks, or holes in beading
Buckle missing
Snap fastener component missing
Snap fastener incorrectly set
Loose stitching, skipped stitches or not backstitched
Ends of webbing not seared
Material not as specified
Clean, free of fingerprints, dirt
Chin strap or nape strap
Assembled to helmet incorrectly
Lens stop
Not properly secured to helmet
4.5.5 Shell finish adhesion test. With a scribe held at approximately a 30º angle, cut three parallel
lines approximately 0.063 inches apart on the painted surface of the shell. These lines shall be
crossed at right angles with three parallel cuts approximately 0.063 inches apart forming four
squares. Sufficient pressure shall be applied on the scribe to cut completely through the painted
surface. Separation or lifting of any of the shell finish squares from the shell shall constitute failure
to pass this test.
4.5.6 Heat exposure test. The helmet assembly shall be stabilized for 1 hour at standard test
conditions. The helmet assembly shall then be weighed, and the distance between the shell center
reference dimples on the shell shall be measured. The helmet shall be placed on its crown in an air
circulating oven at a temperature of 160 ± 27oF for a 4hour period. The helmet assembly shall
then be removed from the oven and stabilized for 1 hour at standard test conditions. Any change in
weight shall not exceed 1 percent nor shall the measured distance vary more than 0.25 inch from the
original measurement. Following the heat exposure test, there shall be no distortion of helmet
components, defects in finish, or separation of adhesive bonds.
4.5.7 Penetration resistance test. The helmet assembly shall be fit on a rigid headform (see 6.7) to
ensure firm support around the target area when properly positioned for tests. The helmet assembly
shall be subjected to impacts by a 16-ounce steel bob, having a 60o included angle pointed tip with a
radius not greater than 0.015 inch and minimum Rockwell hardness of C-60. The bob shall be
dropped (free-fall) from a height of 10 feet onto the outside surface of the helmet shell in a direction
perpendicular to the surface. The points of impact shall be one in each 60º sector at a radial
distance of 4.5 inches from the apex and at the apex. After each impact the test bob shall be
reinserted into the depression with approximately a 10-pound force, and the total depth of its
penetration into the helmet shell shall be measured. Penetration in excess of 0.25 inches at any test
point shall constitute failure to pass this test.
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