MILDTL28803C
3.2 Qualification. The displays furnished under this specification shall be products which are authorized by the
qualifying activity for listing on applicable QPL at the time of award of contract (see 4.4 and 6.3). The variations
allowed from the specification sheet, included in 6.2.2 are as follows and must be within the physical, functional, and
environments parameters of the specification sheet:
a.
Character.
b.
Terminations.
c.
Character's colors.
3.3 Material. The material for each part shall be as specified herein. However, when a definite material is not
specified, a material shall be used which will enable the displays to meet the performance requirements of this
specification. Acceptance or approval of any constituent material shall not be construed as a guarantee of the
acceptance of the finished product.
3.3.1 Metals. All metal parts, other than current-carrying parts, shall be of corrosion resistant material or shall be
suitably protected to resist corrosion.
3.3.1.1 Dissimilar metals and compatible couples. When dissimilar metals are used in intimate contact with each
other, protection against electrolysis and corrosion shall be provided. The use of dissimilar metals in contact, which
tend toward active electrolytic corrosion (particularly brass, copper, or steel used in contact with aluminum or
aluminum alloy) is not acceptable. However, metal plating or metal spraying of dissimilar base metals to provide
similar or suitable abutting surfaces is permitted. The use of dissimilar metals separated by a suitable insulating
material is also permitted. Dissimilar metals and compatible couples are defined in 3.3.1.2.
3.3.1.2 Intermetallic contacts. The finishing of metallic areas to be placed in intimate contact by assembly
presents a special problem, since intermetallic contact of dissimilar metals results in electrolytic couples which
promote corrosion through galvanic action. To provide the required corrosion protection, intermetallic couples are
restricted to those permitted by MILSTD889.
3.3.2 Plastic. Unless otherwise specified, thermosetting plastics shall be flame retardant material; however,
cellulose filled materials shall not be used. When used, thermoplastics shall be self-extinguishing as applicable to the
3.3.2.1 Fiber sheathing. Plasticized polyvinyl chloride shall not be used as a sheathing material for optical fibers.
3.3.3 Finish. Unless otherwise specified (see 3.1) all external aluminum parts shall be anodized in accordance
with MILA8625. The exterior surfaces, designed to be exposed at the front of the panel after assembly, shall have
a black lusterless finish.
3.4 Design and construction. The display shall be of the design, construction, temperature range, and physical
dimensions as specified (see 3.1).
3.4.1 Mounting hardware. Each display shall be provided with mounting hardware specified (see 3.1 and 6.2). For
direct Government orders the hardware shall be assembled in proper order.
3.4.2 Housing. The housing shall be capable of independent or combination mounting as specified (see 3.1).
3.4.3 Screw threads. Screw threads on external threaded parts or parts subjected to replacement or removal,
shall be in accordance with FEDSTDH28.
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