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| MIL-S-19678A(OS)
b. Interior surfaces of items such as tube and coil shields, or potted or hermetical sealed units.
c. Standard or commercial parts which already have a suitable protective coating.
3.4.5.2 Ferrous metal parts Surfaces of ferrous metal parts that are to be painted shall be cleaned and
phosphate treated in accordance with TT-C-490. The surface produced shall be Type 1 as described therein.
3.4.5.3 Aluminum alloy parts. The surface of aluminum alloy parts shall be anodized in accordance with MIL-
A-8625. Surfaces to be painted maybe given a chemical treatment in accordance with MIL-C-5541 in lieu of the
anodic coating.
3.4.3.4 Painting. Painting shall be in accordance with MIL-STD-1303
3.4.5.3 Plating. When required and permitted, the plating of metal surfaces shall be in accordance with the
applicable specification listed herein.
3.4.5.5.1 Plating instructions. The following restrictions on the use of plating apply.
a. Cadmium plating shall not be used in enclosed spaces where flaking wiII cause malfunctioning of the
equipment.
b. Silver plating shall not be used where severe arcing is likely to occur.
c. Zinc plated parts shall be given a subsequent chromate treatment in accordance with ASTM B633, Type II
d. Bright plating, or brightly plated parts, shall not be used exterior to the principal enclosure
3.5 Environmental Requirements.
3.5.1 Temperature. The equipment shall be capable of satisfactory operation between the temperature limits
of -20F and 150F.
3.5.2 Shock. The equipment shall be capable of withstanding the vibration requirements of MIL-STD-167.
Type I tests, as specified therein, shall apply.
3.5.3 Vibration. The equipment shall be capable of withstanding the vibration requirements of MIL-STP-167.
Type I tests, as specified therein, shall apply.
3.5.4 Degree of enclosure. The entire slip ring assembly shall be spraytight as defined in MIL-STD-108
3.5.5 Humidity. The equipment shall operate under humidity conditions set forth in MIL-E-16400.
3.5.6 Moisture, fungus, and corrosion resistance. The slip ring assembly shall be moisture, fungus, and
corrosion resistant as required by NAVORD OS 6341.
3.6 Electrical requirements of slip rings
3.6.1 R. F. section. Three coaxial conductors as follows:
1 60 MC IF
1 MOD Trigger
1 IFF Sync
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