MIL-PRF-87819B
3.3.1 Pure tin. The use of pure tin, as an under plate or final finish, is prohibited both internally and
externally. Tin content of headset and solder shall not exceed 97 percent, by mass. Tin shall be alloyed
with a minimum of 3 percent lead, by mass (see 6.7).
3.4 Interface requirements.
3.4.1 Earphone elements. Earphone elements shall be as specified (see 3.1).
3.4.1.1 Earphone element mounting. The element shall be firmly mounted in the earcup. The
mounting mechanism shall hold the earphone element in the center of the earcup, facing and directly
parallel to the ear opening without shifting under specified conditions. It shall be reusable after repair and
allow easy replacement of the earphone element by skill level 3 repair technicians. The earphone surface
shall not protrude more than 0.75 inch from the uncompressed face of the ear cushion.
3.4.2 Microphone elements. Microphone elements shall be as specified (see 3.1).
3.4.2.1 Microphone boom assembly. The microphone boom assembly shall be as specified (see 3.1).
3.4.2.1.1 Boom interface to earcup. When specified (see 3.1), the boom shall be attached to the left
earcup using a fingers-adjustable screw-and-nut assembly. The assembly shall be grooved to allow the
wire boom to seat securely when tightened. The boom nut assembly shall completely prevent the boom
from slipping from its tightened position during use.
3.4.2.2 Microphone protective shield. The microphone protective shield shall be as specified (see 3.1).
3.4.3 Cable and cord assemblies. The cable and cord assemblies shall conform to the requirements of
MIL-DTL-55668, for consistency with established repair procedures regarding conductor color-coding.
Other electrically-compatible audio-communications cord may be supplied, given that it has equivalent or
superior performance with respect to extremes of temperature, ozone-resistance, flame-retardant, tensile-
strength, retractability, and extension range, when approved by the qualifying activity. Terminations of
the 4-conductor cord at (1) the entry to the earcup and (2) the PIN U-174/U connector shall include a
mechanism to resist slippage of the cable conductors from the associated connector due to twist and pull
during normal use, when tested as specified in 4.7.12.
a. Two-conductor cords shall be shielded overall, for electrical-isolation, and have a jacket diameter
of .140 ± .015 inch, for interface to connectors, and for adherence to the flex-life requirements of
this specification.
b. The jacket compound and insulation materials shall be in accordance with ASTM D866 and ASTM
D470, or shall be material having equivalent or superior performance with respect to ozone-
resistance, flame-retardant, deterioration by heat and air pressure aging (see ASTM D454), heat
and oxygen (see ASTM D572), and air oven (see ASTM D573), as specified.
c. The 4-conductor (console) cord shall be integrated with the 2-conductor (earcup-to-earcup) cord in
a manner which allows replacement of either section individually during repair (see 3.5.18), while
also meeting the attenuation and twist-pull requirements of this specification.
3.4.4 Headset-microphone. The configuration for products covered by this specification shall be as
specified (see 3.1).
3.4.5 Finish. The finish shall be a nonreflective, lusterless, dark color having low contrast with colors in
operational clothing and gear, such as black, grey, dark blue, or green. The finish shall be uniform in
color. The use of any protective coating that will crack, chip, or scale with age, normal use, or extremes
of atmospheric conditions shall be avoided.
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