MIL-DTL-9398D
2.4 Order of precedence. In the event of a conflict between the text of this document and
the references cited herein the text of this document takes precedence. Nothing in this document,
however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 Qualification. Generators furnished under this specification shall be products that are
authorized by the qualifying activity for listing on the applicable qualified products list (QPL)
before contract award (see 4.3 and 6.3).
3.2 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible, provided
that the material meets or exceeds the operational and maintenance requirements and promotes
economically advantageous life cycle costs.
3.3 Materials. Materials shall conform to applicable specifications and shall be as
specified herein. Materials for which there are no applicable 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 Critical materials. Non-critical materials shall be used where practicable. Where the
use of a critical material is essential to meet specification requirements, the material used shall be
the least critical of those that are adequate for the purpose.
3.3.2 Nonmagnetic materials. Nonmagnetic materials shall be used for all parts of the
generator except where magnetic materials are essential.
3.3.3 Metals. Metals shall be of the corrosion-resistant type or shall be suitably protected
as specified herein to resist corrosion due to fuels or oils, salt spray, or atmospheric conditions to
which the generator may be subjected when in storage or normal service life.
3.3.3.1 Dissimilar metals. Dissimilar metals as defined in MIL-STD-889 shall not be used
in intimate contact with each other unless suitably protected against electrolytic corrosion by
means of protective coatings.
3.3.3.2 Magnesium alloy parts. Magnesium alloy parts shall be treated in accordance with
SAE AMS-M-3171. When abrasion resistance is a factor, an anodic treatment approved by the
procuring activity shall be used. For new design, the use of magnesium is prohibited unless
specifically approved by the procuring activity.
3.3.3.3 Aluminum alloy parts. Where practicable, aluminum alloy parts shall be covered
with an anodic film conforming to MIL-A-8625. Small holes, threads, and case inserts need not be
anodized. Aluminum alloys which do not anodize satisfactorily shall be coated with a chemical
film in accordance with MIL-DTL-5541.
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