MIL-PRF-87819/1B
Buckles:
The strap assembly sections shall be joined by a mechanism, which allows the
protective shield to be easily adjusted without allowing slippage during use. It
shall not damage the strap material. Color shall provide low-contrast with
operational clothing and gear.
Removable connection:
The 1 (one) removable connection shall prevent inadvertent detachment during
use.
Permanent connection:
The 3 (three) permanent connections shall prevent inadvertent detachment of the
microphone shield assembly, when not in use.
Earphone element: The earphone element shall be PIN H-143/AIC, as specified in
MIL-PRF-25670/2, (2 required), or an electrically compatible part having
equivalent or superior noise-canceling, environmental, and voice-band frequency
response at ground level and altitude, meeting established United States Air
Force hazardous noise exposure standards.
Earcup filler clearance:
Fillers shall allow clearance of at least 0.500 inch from the uncompressed face of
the earcushion.
Wiring diagram:
Wiring shall be as specified on figure 4, for consistency with repair procedures.
Connectors:
Connectors shall be a PIN U-179A/U type or equivalent as approved by
qualifying activity; PIN U-174/U as specified on MIL-DTL-9177/2, and PIN
U-173/U as specified on U.S. Air Force drawing 57B12662, or electrically and
mechanically compatible parts, as approved by the qualifying activity. See
figure 1.
Weight:
The weight shall be sufficient to meet the attenuation requirements of this
specification, without compromising comfort, not to exceed 1.75 pounds.
PIN:
M87819/1-01
Performance
characteristics:
See table I, table II, and MIL-PRF-87819.
Attenuation:
Testing for attenuation shall be as specified in MIL-PRF-87819, with the
exception that table I (specified herein) shall be used for attenuation values.
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