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MIL-S-25073A(USAF)
3.2.1 Standard parts. Standard parts (MS, AN, or JAN) shall be used
wherever they are suitable for the purpose, and shall be identified on the
drawing by their part numbers. Commercial utility parts such as screws,
bolts, nuts, cotter pins, et cetera, may be used, provided they possess
suitable properties and are replaceable by the standard parts (MS, AN, or
JAN) without alteration, and provided the corresponding standard part
numbers are referenced in the parts list and on the contractor's drawings.
In the event there is no suitable corresponding standard part in effect on
date of incitation for bids, commercial parts may be used provided they con-
form to all applicable requirements of this specification.
3.3 Materials.
3.3.1 Protective treatment. When materials are used in the construction of
the seat that are subject to corrosion in salt air or other atmospheric con-
dition likely to occur during service usage, they shall be protected against
such corrosion in a manner that will in no way prevent compliance with
the performance requirements of this specification. The use of any protective
coating that will crack, chip, or scale with age or extremes of atmospheric
conditions shall be avoided.
3.3.2 Metals. Metals shall be of the corrosion-resistant type or suitably
treated to resist corrosion due to fuels, salt spray, or atmospheric condi-
tions likely to be met in storage or normal service.
3.3.3 Heat treat. Materials which require heat treatment in order to
satisfactorily accomplish their design shall be heat treated in accordance
with MIL-H-6875 for steels and MIL-H-6088 for aluminum.
3.3.4 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 MS33586.
3.4 Design. The seat shall be designed for maximum comfort and ease of
adjustment. The area above and to each side of the seat bottom pan should be
left as open as possible to aid ingress, egress, and freedom of movement for
the seat occupant.
3.4.1 Dimension. The critical dimensions of the seat shall be as specified
in Figures 1 through 4.
3.4.2 Adjustments. The seat shall be adjustable as follows:
3.4.2.1 Vertical adjustment. The seat shall be provided with a 5-inch
vertical adjustment as indicated in Figure 1. The seat shall be adjustable
in increments of 1/2 inch within the 5-inch adjustment range. This adjust-
ment shall incorporate a loaded mechanical device which shall raise the seat
as the occupant's weight is removed. This load shall not exceed 150 pounds
when the seat is in the lowest position nor be less than 30 pounds when the
seat is in the highest position. Suitable stops shall be provided at the
ends of the adjustment range.
3.4.2.2 Horizontal (fore-and-aft) adjustment. The seat shall be adjustable
along the tracks for a distance of 6 inches in increments of not more than
1 inch, as indicated on Figure 1. Suitable stops shall be provided at the
ends of the adjustment range.
3

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