MIL-DTL-87174A(USAF)
3.3
Design and construction. The helmet and its components shall be constructed in accordance
with Drawing 81D5330, the subsidiary drawings listed below and their detail drawings, and the
requirements specified herein.
DRAWINGS
COMPONENTS
79B4695
Pile Fastener Ear Section
80C4782
Chin Strap, Subassembly
80C4784
Nape Strap, Subassembly, Universal
81B5370
Lens Stop Device
81D5332
Helmet Shell, Medium
81D5333
Helmet Shell, Large
81D5334
Helmet Shell, XLarge
81D5335
Patterns. Edgeroll
3.3.1 Visor hardware. The flanged nuts with washers shall be installed in the visor mounting
holes as shown on Drawing 68H274.
3.4
Performance.
3.4.1 Shell finish adhesion. The shell finish coating shall adhere to the shell during normal use.
3.4.2 Heat exposure. The helmet assembly shall not change in weight by more than 1 percent, nor
shall there be a change in distance between the shell center reference dimples greater than 0.25 inch.
No other changes affecting appearance or serviceability and no visible distortion of the components
shall take place as a result of the heat exposure of up to 160 ± 27 oF.
3.4.3 Penetration resistance. The helmet shell shall withstand an impact of a pointed, 16-ounce
steel bob freely dropped from a height of 10 feet. The bob shall have a point having a maximum
radius of 0.015 inches. Penetration shall be less than 0.25 inches when measured from outside the
helmet shell.
3.4.4 Impact protection. When an impact of 35 foot-pounds energy is applied to the helmet
assembly, acceleration experienced by the headform shall not exceed 150g for more than 6
milliseconds, 200g for 3 milliseconds, or 400g.
3.4.5 Windblast protection. The complete helmet assembly shall not loosen or tear away from
the headform or break during windblast of 450 ± 20 kt.
3.4.6 Fastener tape bond. All fastener tapes shall remain bonded to the liner over at least 75%
of their total area when tested as specified in 3.2.5
3.5
Components used with the HGU55/P helmet. When procured as part of the HGU55/P
helmet acquisition (see 6.2), the listed components shall meet the requirements specified herein and
shall compose a complete assembly.
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