MIL-PRF-10436N
3.5.4 Thermal shock (vials only). Self-excited luminous sources shall not be damaged by
thermal shock caused by sudden temperature changes of -52°C to 68°C (see 4.4.2.4).
3.6 Support requirements.
3.6.1 Dimensions and weight. The compass shall not be greater than 9 cm long, 8 cm wide
and 4 cm high, in its closed or stored configuration. Its weight shall not be greater than 170
grams (see 4.4.3.1)
3.6.2 Radiological containment. If radioactive luminous light sources are used (see 3.4.10),
these subordinate requirements are mandatory.
3.6.2.1 Contamination. Removable contamination activity of the completed compass shall be
less than 900 disintegration rate per minute (dpm) at the time of production (see 4.4.3.2.1).
3.6.2.2 Diffusion. A completed compass with all the luminous vials installed shall not leak
radioactive material in excess of 0.05 microcuries in 24 hours (see 4.4.3.2.2).
3.6.3 Impact durability of vials. If radioactive self-luminous source vials are used, the vials
shall show no evidence of leakage, breaking, checking, shattering or spalling when the compass
is dropped onto a hard surface (see 4.4.3.3).
3.6.4 Durability. The case, compass body, crystal, and moving parts shall meet all of the
requirements that are described, herein, for a minimum service life of 12 years (see 4.4.3.4).
3.6.5 Finishes.
3.6.5.1 Wear surfaces. Any exterior surfaces subject to wear from repeated use shall be
finished in a manner that produces a wear resistant semi-gloss black finish (see 4.4.3.5.1)(see
6.2)(see 6.11).
3.6.5.2 Non-wear surfaces. All other external surfaces shall be treated and painted for
corrosion protection, as necessary. The finish coat shall be semi-gloss green enamel (see
4.4.3.5.2)(see 6.11).
3.6.5.3 Damping shell. The inside (visible) surfaces of the damping shell shall be treated and
painted for corrosion protection. The finish coat shall be semi-gloss white enamel (see 6.11)(see
4.4.3.5.3).
3.6.6 Markings.
3.6.6.1 Identification. Lot identification shall be permanently marked on the compass, inside
the cover (if applicable) to include year and month of manufacture and lot number. The top of
the compass shall be marked with the identification and part number of the manufacturer, and
National Stock Number (NSN) (see 4.4.3.6.1).
3.6.6.2 Radiation marking. If radioactive materials are used in the production of the compass,
one of these subordinate requirements is mandatory (see 6.2).
3.6.6.2.1 Specific license marking. The bottom of the compass shall be permanently marked
as required by applicable Nuclear Regulatory Commission Byproduct Materials License. It shall
include the radiation caution symbol (not in color), quantity of isotope, the byproduct-materials
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