MIL-DTL-44117B
one size only. The sample unit shall be one helmet shell after drilling of holes (without edge
beading). The inspection level shall be in the contract (see 6.2).
1/ The thickness of the helmet shell shall be measured to the nearest 0.001 inch at five different
locations. One measurement shall be taken at the approximate top center of the helmet and the
other four measurements shall be taken in the approximate center of each of the four quadrants not
less than 3-1/2 inches from the top center. All five measurements shall be averaged. If the
averaged thickness is not within tolerance, it shall be scored as a defect.
2/ Reference Drawing 8-2-830. Chord dimensions between holes, taken from the inside of the
helmet shell, shall be checked and any failure to conform to any of the dimensions specified on
Drawing 8-2-830 shall be scored as a defect. Dividers should be used in measuring the chord
distance from the bottom of the holes to the bottom of the holes involved.
3/ The peripheral contour dimensions shall be checked by measuring the inside length of the
helmet between the points at 0° and at 180° as shown on Drawing 8-2-830. The inside width shall
be measured between the points at 90º and 270º as shown on Drawing 8-2-830. Any failure to
conform to any of the dimensions specified on Drawing 8-2-830 shall be scored as a defect.
4/ If all ten benchmarks appear on the helmet shell, the measurement of the height dimension is
not necessary.
5/ Reference Drawings 8-2-658 & 8-2-659. All measurements deviating from finished
dimensions/tolerances in 4.4.2.3 shall constitute Major defect #164 in Table VI.
4.4.2.4 Visual examination of helmet shells prior to application of coating and edge beading.
The helmet shells prior to the application of coating and edge beading shall be examined for the
defects listed in Table VI. The lot shall be expressed in units of helmet shells of one size only.
The sample unit shall be one helmet shell before application of coating and edge beading. The
inspection level shall be in the contract (see 6.2).
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