MIL-DTL-44117B
TABLE I. Sound attenuation
Octave band center frequency (Hz)
Real ear attenuation (dB)
125
14
250
16
500
21
1,000
23
2,000
28
3,150
35
4,000
35
6,300
35
8,000
30
3.7.4 Adhesion of the shell edge beading before aging. The edge beading shall remain firmly
bonded to the shell when tested as specified in 4.4.5. Unbonded areas up to a total of two inches in
length are acceptable, providing no individual unbonded area is more than 1/2 inch in length and
1/8 inch in width. There shall be a minimum distance of 1/2 inch between any two unbonded
areas.
3.7.5 Adhesion of the shell edge beading after aging. When tested as specified in 4.4.5, the
edge beading shall not peel back more than 1/4 inch from the helmet shell.
3.7.6 Communication equipment operation. When communication equipment (headset-
microphone assembly) is specified in the contract or solicitation, it shall function satisfactorily
after installation in the helmet, when tested as specified in 4.4.5.
3.7.7 Water immersion. The coating on the outside surface of the helmet shell shall show no
evidence of softening, peeling, or blistering when tested as specified in 4.4.5.
3.8 Repairs. Except as otherwise specified herein, repairs to the helmet assembly shall not be
permitted.
3.9 Replacement of defective components. During the spreading, cutting, and manufacturing
process, textile and leather components having material defects or damages that are classified as
defects in 4.4.2.4, 4.4.2.5 and 4.4.3 shall be removed from production and replaced with
nondefective components.
3.10 Workmanship. The finished helmet assembly shall conform to the quality of product
established by this specification. The occurrence of defects shall not exceed the acceptable quality
limits as specified in the contract and/or order, except where otherwise indicated (see 6.2).
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified
as follows:
a. First article inspection (see 4.2).
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