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|  MIL-S-55257C(CR)
3.6.2 Aircraft loading data plate. The shelter assemblage shall be
provided with data plates in accordance with equipment drawings, imprinted
with the dimensions which locate the center-of-gravity of the shelter fa-
cility and the assemblage in the three planes; the gross weight of the
shelter facility and assemblage; and the bearing pressure on the bottom of
the skids. The location of the centers-of-gravity shall be determined by
the contractor using the first article/unit of production.
3.7 Riveting. Riveted joints shall be tight; the joined parts
shall be undamaged, and the rivet heads shall be properly seated and tight
against their bearing surfaces. Rivets shall conform to requirement 12 of
MIL-STD-454.
(See 3.20)
3.8 Securing of parts. Brackets, lugs, flanges, inserts, bolts and
other mounting arrangements shall retain the components of the Electronic
Shops securely so that loosening, wear of mounting arrangements or perma-
nent separation of parts or components will not occur when the equipment
is subject to specified drop and transport tests.
(See 3.20)
3.9 Soldering. (See 3.20)
3.9.1 Solder and flux.
Solder and flux shall be as defined on the
drawings,
3.9.2 Acid or acid salts. No acid or acid salts shall be used in
preparation for or during soldering; however, exception is permitted for
preliminary tinning of electrical connections and for tinning or soldering
of mechanical joints not used to complete electrical circuts, but in no
case shall acid or acid salts be used where they can come in contact with
insulation material. Where acid or acid salts are used as permitted
above, they shall be completely neutralized and removed immediatley after
use.
3.9.3 Process. There shall be no sharp points or rough surfaces
resulting from insufficient heating. The solder shall feather out to a
thin edge, indicating proper flowing and wetting actions, and shall not
be crystallized, overheated, or underheated. The minimum necessary
amount of flux and solder shall be used for electrical connections. Any
means employed to remove an unavoidable excess of flux shall not incur the
risk of loose particles of flux, brush bristles, or other foreign material
remaining in the equipment. Insulation material that has been subject to
heating during the soldering operation shall be undamaged and parts fast-
ened thereto shall not have become loosened.
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