MIL-PRF-10436N
approved first article model, improper source alignment or bonding shall constitute failure of that
compass only. In cases of question, the luminosity of the source shall be determined as specified
in 4.4.1.9.4.1. Failure of one or more sources to perform all compass functions in any ambient
light and under any of the environmental conditions specified herein shall constitute failure of
that compass only.
4.4 Test and examination.
4.4.1 Operating requirements validation.
4.4.1.1 Graduations. The compass graduations shall be visually examined to verify that the
degrees are in semi-gloss red (see 6.11) with 5-degree intervals, the mil graduations are in semi-
gloss black (see 6.11) with 20-mil intervals, and graduations are distinguishable in day and night
conditions. Any deviation constitutes failure of this requirement.
4.4.1.2 Scale. The compass scale shall be visually examined to verify that it has a 1:50000
scale with 100 meters graduations, 0 to 6000 minimum, along the length of the compass, in the
opened configuration (if applicable). Any deviation constitutes failure of this requirement.
4.4.1.3 Sighting device. The compass shall be aimed at a target. Inability to aim the compass
at the target utilizing sighting mechanism shall constitute failure of this requirement.
4.4.1.4 Bezel. The bezel shall be rotated 360 degrees in both directions. Failure of the bezel
to rotate in either directions in three-degree increments with tactile (non-audible) feedback or to
restrict accidental movement or to remain attached shall constitute failure of this requirement.
4.4.1.5 Free floating assembly. The compass shall be examined in an open and closed
configuration. The restraining mechanism shall be tested by hand shaking the closed compass;
rattling of the floating dial assembly shall constitute failure of this requirement. Then, the
compass shall be opened to a reading position; failure of the restraining mechanism to release the
dial assembly shall constitute failure of this requirement.
4.4.1.6 Lanyard. The neck lanyard shall be examined to verify that the thickness is 2.5 ±0.5
mm and the ends are permanently joined to form a loop of 150 ±5 centimeters (cm) in
circumference, and that the material is a suitable, pliable, durable material of lusterless green
(see 6.11). Failure of this examination constitutes failure of this requirement.
4.4.1.6.1 Lanyard attachment. The assembled compass shall be fixed in an apparatus able to
withstand the forces to be applied that will not hinder or support the attachment of the lanyard.
A minimum tensile force of 34 kilograms shall be applied to the attached lanyard, at a point
where the force is exerted on both the joint forming the loop and the point of attachment to the
compass. Any damage or breakage of the lanyard or compass shall constitute failure of this test.
4.4.1.7 Carrying case. The carrying case shall be examined to verify that the material is
pliable and durable and the color is lusterless green (see 6.11). In addition, verify that the case
has a heavy-duty lusterless black (see 6.11) fastening system on the flap enclosure, a means for
drainage, and a 7 mm belt attachment. The compass shall be placed in the case and the case flap
fastened and unfastened. Then the compass shall be removed from the case to verify ease of
storage and removal. There shall be no snags or tightness within the case, which prevents the
compass from slipping in and out easily. Failure of this examination constitutes failure of this
requirement.
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