MIL-R-17852C(AS)
3.
REQUIREMENTS
3.1 First article. When specified, a sample shall be subjected to
first article inspection (see 4,3 and 6.4).
3.2 Selection of specifications and standards. Specifications and
standards for necessary commodities and services not specified herein
shall deselected in accordance with MIL-STD-143.
3.3 Materials. Materials shall conform to applicable specifications
and shall be as specified herein and on applicable drawings. Materials
which are not covered by specifications, or which are not specifically
described herein, shall be of the best quality, of the lightest practicable
weight, and suitable for the purpose intended.
3.3.1 Metal parts. All metal parts shall be of a corrosion resistant
material or treated in a manner to render them adequately resistant to
corrosion.
3.3.1.1 Dissimilar metals. Dissimilar metals, such as defined in
MIL-STD-889, shall not be used in intimate contact with each other
unless suitably protected against electrolytic corrosion with protective
coatings.
3.3.2 Nonmetallic materials. Any nonmetallic material that is adversely
affected by continued use with oxygen shall not be used.
3.3.2.1 Age. Elastomer components, except silicone, shall not be
more than 12 months old from the cure date of manufacture to the date of
delivery to any Government Service or to any airframe or accessory
manufacturer.
3.3.2.2 Fungus-proof materials. Materials which are not nutrients
for fungi shall be used to the greatest extent practicable. In cases
where materials that are nutrients for fungi must be used, such materials
shall be treated with a furigi.tidal agent, as approved by the acquiring
activity (see 6.2).
3.3.3 Protective treatment. When materials are used in the construction
of the reducers that are subject to deterioration when exposed to enviromental
conditions likely to occur during service usage, they shall be protected
against such deterioration in a manner that will in no way prevent
compliance with the performance requirements of this specification.
Protective coating which might crack, chip, or scale during normal
service life or under extremes of environmental conditions shall not be
3.4 Standard parts. MS and AN standard parts shall be used where
they suit the purpose. They shall be identified on the manufacturer's
drawings by their part numbers. Parts which are not covered by specifications
or military standard, or which are not specifically described herein or
on the drawings, shall be completely described on manufacturer's drawings.
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