MIL-PRF-10436N
radioactive contamination on the filter paper shall be determined using a liquid scintillation
counting system capable of measuring 100 picocuries or less of radioactivity. The paper shall be
placed in the liquid scintillation solution within one minute of wiping the compass. A removable
contamination activity of more than 900 dpm per compass shall constitute failure of this test.
4.4.3.2.2 Diffusion. The completed compass with all the self-luminous sources installed shall
be submerged in 300 ml of distilled or deionized water for 24 hours at 23° ±5°C. The compass
shall be removed from the water and the water shall be analyzed. If the radioactive content of
the water exceeds .05 microcuries, it shall constitute failure of the test.
4.4.3.3 Impact durability of vials. Unless otherwise specified (see 6.2), the first article
compasses only shall be subjected to this testing procedure. Each compass, in the open
configuration (if applicable), shall be subjected to a free fall from a height of 100 cm onto an
unyielding, rigid steel surface. The compass shall be dropped twice, without effort to orient the
compass or shield the self-luminous sources. Unaided, visual evidence of leakage, breaking,
checking, shattering, spalling of the vials shall constitute failure of this test. Damage to the
compass, other than the vials, does not constitute failure of this test.
4.4.3.4 Durability. Unless otherwise specified (see 6.2), the first article compasses only shall
be subjected to this testing procedure. The compass shall demonstrate a 99% probability of
success with a 95% low confidence level with zero failures, each compass shall be tested as
follows (recommended minimum number of cycles is 473):
a. Remove from its case and open the compass completely (if applicable).
b. The compass in the open configuration, if applicable, shall be dropped from a height
of 90 cm, alternately on its face, side and bottom, onto a solid surface covered with
10 cm of 40 grit kiln dried sand. The sand may be covered with a sheet of plastic not
greater than 2 mils thick.
c. After each drop examine the compass for damage.
d. After each drop rotate the bezel 360º, clockwise on even numbered drops and counter-
clockwise on odd numbered drops, to ensure proper operation.
e. After each drop, alternating targets, sight the compass on one of three targets of
known magnetic azimuths approximately 120º apart and record each reading.
f. After every tenth drop test the compass for friction error as defined in 4.4.1.9.3.
g. Close the compass (if applicable) and return it to the case.
Any evidence of damage (other than cosmetic) to the compass (or its case) or inability to operate
as specified herein shall constitute failure of this test.
4.4.3.5 Finishes.
4.4.3.5.1 Wear surfaces. The compass shall be examined to verify that all exterior surfaces
subject to wear are finished in a wear resistant semi-gloss black (see 6.11) finish (e.g. black
oxide or anodizing). Failure of this examination constitutes failure of this requirement
4.4.3.5.2 Non-wear surfaces. The compass shall be examined to verify that all external non-
wear surfaces have been treated and painted with semi-gloss green enamel (see 6.11). Failure of
this examination constitutes failure of this requirement
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