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Page Title:
Selection of specifications and standards |
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|  MIL-S-27174B(USAF)
3.2 Components. The complete seat assembly shall consist of a metal
tubular frame, a fabric bottom, and a back fabricated from webbing.
3.3 Selection of specifications and standards. Specifications and
standards or necessary commodities and services not specified herein shall be
selected according to MIL-STD-143 except as provided in 3.3.1 and 3.3.2.
3.3.1 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, 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 and, if practical, on the contractor's drawings.
3.3.2 Standard parts. With the exception in 3.3.1, MS and AN standard
parts shall be used where they suit the purpose. They shall be identified
on the drawings by their part numbers.
3.4 Materials.
3.4.1 Fungus proof materials. Materials that are nutrients for fungi
shall not be used where it is practical to avoid them. Where used and not
hermetically sealed, they shall be treated with a fungicidal agent acceptable
to the procuring activity. However, if they will be used in a hermetically
sealed inclosure, fungicidal treatment will not be necessary.
3.4.2 Metals. Metals shall be of the corrosion-resistant type or
suitably treated to resist corrosion due to fuels, salt spray, or atmospheric
conditions likely to be met in storage or normal service.
3.4.2.1 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.
3.5 Design. The seat shall be designed for installation on the right or
left side of the airplane in such a manner that the occupants face inboard
and, also, be capable of installation in two rows, back to back in the center
of the airplane so that the occupants face outboard. The installed areas
shall provide a variable seat width of 20 to 24 inches per occupant by
adjustment of the seat belt attachment points. The seat shall provide
maximum comfort and ease of releasing for stowing.
3.5.3 Folding and stowing. All seats shall be so designed that the leg
or legs and seat bottoms may be quickly folded against and lashed to the seat
back with the leg or legs in between the seat bottom and seat back.
3.5.1.1 Folding and unfolding time. The seats shall be designed to
permit folding and lashing or unlashing and unfolding quickly and easily
without the use of tools or special equipment by one man, in a period not
to exceed 10 seconds.
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