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Page Title:
Selection of Specifications & Standards. |
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|  MIL-M-87977(USAF)
2.3 Order of precedence,
In the event of a conflict between the test of this
specification and the references cited herein (except for associated detail
specifications , specification sheets or MS standards) , the text of this
specification shall take precedence, Nothing in this specification, however, shall
supersede applicable laws and regulations unless a specific exemption has been
obtained.
3*
REQUIREMENTS
3.1 First Article. This specification makes provisions for the First Article
(reproduction) Testing (see 4.4).
Specifications and standards for
3.2 Selection of Specifications & Standards.
necessary commodities and services not specified herein shall be selected in
accordance with MIL-STD-143.
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, such as screws, bolts, nuts and cotter pins
having suitable properties may be used provided:
a.
They can be replaced by the standard parts (MS or AN) without alteration.
b.
The corresponding standard part numbers are referenced in the parts list
3.2.2 Standard Parts. With the exception of 3.2.1. MS or AN standard parts shall
be used where they suit the purpose,
3.3 Materials
3,3.1 Metals. Metals shall be of the 6061-T6 aluminum type or suitable treated
to resist corrosion due to fuels, salt spray, or atmospheric conditions likely
to be met in storage or normal service, When materials are used that are subject
to corrosion, they shall be protected against such corrosion in a manner that will
in no way prevent compliance with the performance requirements specified herein.
The use of any protection coating that will crack, chip, or scale with age or
extremes of atmospheric conditions shall be avoided.
3.3.2 Dissimilar Metals. Unless suitably protected against electrolytic
corrosion, dissimilar metals shall not be used in intimate contact with each other.
Dissimilar metals are defined in MIL-STD-889.
3.4 Design & Construction. The design and construction of the maintenance
platform shall Incorporate the various performance requirements together with the
features specified herein. The maintenance platform shall be designed to the
requirements of MIL-S-8512 and MIL-STD-1472. Design must include use of standard
commercial components to the extent that replaceable item equivalents be available
It shall be built to
during the expected 20 years service life of the platform.
withstand the jars, strains, vibrations and other conditions incident to shipping,
storage and service. Stress calculations shall be submitted to show compliance with
The main frame shall be of 6061-T6 aluminum cross-sections and shall be
MIL-S-8512.
mainly pinned (fittings, rivets, bolts, clamps) construction with the least possible
welds.
3
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