MIL-DTL-25446E
3.1.1 Maintenance of qualification. At specified intervals determined by the qualifying
activity, the manufacturer must be able to demonstrate that the company still has the capabilities
and facilities necessary to produce the QPL items in accordance with this specification and in
accordance with the provisions governing qualification specified in SD-6.
3.2 Parts.
3.2.1 Commercial parts. Commercial parts having suitable properties may be used
where, on the date of invitation for bids, there are no suitable standard parts. In any case,
commercial utility parts, like screws, bolts, nuts, and cotter pins, having suitable properties may
be used provided:
a. They can be replaced by MS or AN standard parts without alteration.
b. The corresponding standard part numbers are referenced in the parts list and, if
practical, on the contractor's drawings.
3.2.2 Standard parts. With the exception in 3.2.1, MS and AN standard parts shall be
used where they suit the purpose. They shall be identified on the drawings by their part number
(see figure 1 and table I).
3.3 Materials. Materials that are not covered by applicable specifications shall be of the
best commercial quality, of the lightest practicable weight, and entirely suitable for the purpose
(see figure 1). Nonflammable materials shall be used in the construction of the transmitter.
3.3.1 Corrosion resistance. Materials shall be of corrosion-resistant types or shall be
suitably protected to resist corrosion.
3.3.2 Dissimilar metals. Unless suitably protected against electrolytic corrosion,
dissimilar metals shall not be used in intimate contact. Dissimilar metals are defined in
MIL-STD-889.
3.3.3 Toxic and corrosive fumes. The materials used in the construction of the
temperature transmitter shall not release gases which combine with the atmosphere to form acids
or corrosive alkalis, nor shall they release toxic fumes when burned.
3.3.4 Fungus-inert materials. Materials that are not nutrients for fungi shall be used to
the greatest extent practicable. Where materials that are nutrients for fungus must be used, such
materials shall be treated with a fungicidal agent, as approved by the procuring activity (see 6.2).
Materials that are fungal nutrients and that are contained within a hermetically sealed enclosure
need not be treated with a fungicide.
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