MIL-PRF-87819/1B
REQUIREMENTS:
Design and construction:
Configurations:
See figures 1, 2, 3, and 4.
Headband pressure:Headband pressure shall be sufficient to meet the noise attenuation
requirements of this specification, without compromising comfort, not to exceed
3.5 pounds.
Microphone protective shield assembly:
Microphone:
Microphone shall be PIN M-101/AIC, as specified in MIL-PRF-26542/4 (1
required), or a microphone providing equal or superior acoustic, environmental,
altitude-capable and noise-canceling performance. The microphone shall be
securely attached to the protective shield in a manner which prevents motion
during use, as well as removal during routine headset maintenance (see figure
2).
Protective shield: The microphone protective shield shall be provided, as specified on figure 2.
Dimensions related to interface with the shield cushion shall be provided as
shown (see Cushion). Other dimensions may vary to the extent that they provide
superior performance with respect to human interface (hand grasp, 50th
percentile male aviator), shock (drop), noise exclusion, and acoustical
compatibility with the microphone element. Cord dimension shall be as shown.
Color:
Color of the shield shall be the same as the earcups, for consistency.
Filler:
The shield shall be designed to reduce acoustic echoes within the shell. If this
requirement is satisfied using an acoustic-damping foam material, the material
shall be flame-retardant, and meet or exceed the performance requirements of
MIL-PRF-87819.
Cushion:
The microphone protective shield cushion shall be in accordance with U.S. Air
Force drawing 66B853, for human interface (comfort) under the temperature,
work-shift, and noise-conditions encountered in flight-line and shop (engine-test)
applications. The color shall be black.
Microphone strap
assembly:
The microphone shield shall be secured to the earcups by two different strap
assemblies, as specified on figure 1 and figure 3.
Straps:
The straps shall conform to the dimensions on figure 3, to enable it to support the
dangling microphone shield (when fully extended), as well as enable full
adjustment of the microphone shield to the user (when fully tightened). The strap
material shall provide high-strength, flame-retardant, fungus-resistant, and slip-
resistant performance under the environmental conditions specified. Color shall
provide low-contrast with operational clothing and gear.
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