MIL-S-26716A (USAF)
3.3 Selection of specifications and standards.
Specification and stand-
ards for necessary commodities and services not specified herein shall be
selected according to MIL-STD-143 except as provided in 3.3.1.
3.3,1 Standard parts, AN or MS standard parts shall be used wherever
they are suitable for the purpose and shall be identified by their part
Commercial utility parts such as screws, bolts, nuts, cotter pins,
numbers.
hose, fittings, etc., may be used, provided they have suitable properties and
are Interchangeable with AN, MS, or MIL standard parts without alterations,
3.4 Material. All material used shall be as specified herein. Material
not specified shall be of the best quality used for the purpose in good
commercial practice. The material shall be free from all defects and imper-
fections that might affect the serviceability of the finished product.
Mounting pads, adapters, and spline drives shall be constructed of material
specified in the detail specification.
3.4.1 Protective treatment. Materials used in the construction of the
equipment that are subject to deterioration when exposed to climatic and
environmental conditions likely to occur during service usage shall be pro-
tected against such deterioration in a manner that will in no way prevent
compliance with the performance requirements of this specification.
3.4,2 Metals, Metals shall be of corrosion resistant type, unless
suitably protected to resist corrosion during normal service life and shall
be suitable for the application intended, Metals not resistant to corrosion
shall be cadmium, dull zinc, or dull nickel plated.
3.4.2.1 Dissimilar metals. Unless suitably protected against elec-
trolytic corrosion, dissimilar metals shall not be used in intimate contact
with each other, Dissimilar metals are defined in MIL-STD-889.
3.4,3 Plating. All fixtures, adapters and couplings that are not made
of corrosion resistant materials or anodized aluminum shall be cadmium, dull
zinc, or dull nickel plated,
Plating shall be in accordance with standard
commercial practice for this type of equipment.
3.5 Design and construction
3.5.1 Design. The design, layout and assembly of the cabinet and its
component parts shall be such as to facilitate quantity production and ease
of maintenance.
3.5.2 Structure
All equipment shall be located within an all-metal
fully closed cabinet suitably braced to carry the load imposed, The cabinet
shall be fully guarded to shield fan blades, heating coils, electrical
connections , and any other component parts that may present a hazard to the
operator . The cabinet shall be so constructed that it will withstand trans-
portation by common carrier without damage. Instrument panels shall be so
constructed of 11 gage or heavier metal suitable for the purpose, Doors and
cabinet panels other than instrument panels shall be a minimum of 14 gage
metal.
3,5.3 Size. Cabinet size shall not exceed 10 feet length by S feet depth
(depth from operator's side of stand to rear) by 6 1/2 feet height. Test
equipment requiring a cabinet of a larger size shall be constructed in sec-
tions to meet this size requirement,
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