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|  MIL-F-26301F
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the
applicable specification sheet. In the event of any conflict between the requirements of this specification and the
specification sheet, the latter shall govern.
3.2 First article. When specified (see 6.2), a sample shall be subjected to first article inspection (see 6.3) in
accordance with 4.2.
3.3 Materials. Materials shall be as specified herein. However, when a definite material is not specified, a material
shall be used which will enable the flashers to meet the performance requirements of this specification. Materials
used shall be self-extinguishing and shall not support combustion, emit noxious gases in harmful quantities, emit
gases in quantities sufficient to cause explosion of sealed enclosures, or form current-carrying tracks when subjected
to any of the tests specified herein. Unless otherwise specified (see 3.1), the selection of material shall be such as to
provide a shelf life of at least 2 years without affecting the operation of the flasher. Acceptance or approval of any
constituent material shall not be construed as a guaranty of the acceptance of the finished product.
3.3.1 Metals. Metals shall be of a corrosion-resistant type or shall be plated or treated to resist corrosion.
3.3.1.1 Dissimilar metals. 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 tends toward active
electrolytic corrosion (particularly brass, copper, or steel used in contact with aluminum or aluminum alloy), is not
acceptable. However, metal spraying or metal plating of dissimilar or aluminum base metals to provide suitable
abutting surfaces is permitted. Dissimilar metals should be as defined in 6.4. In hermetic seals, the 0.25 volt
difference between the header material and the housing material is not applicable.
3.3.1.2 Aluminum alloy parts. Aluminum alloy parts, where practicable, shall be anodically treated in accordance
with MIL-A-8625. The aluminum oxide film deposited by this treatment shall be removed from actual contact areas of
all surfaces required to act as paths for electrical power and from local areas under screws, nuts, etc., used for
assembly or mounting purposes to provide an adequate bonding connection.
3.3.2 Fungus resistance. Materials used in construction of flashers shall be fungus inert in accordance with
ASTM G 21.
3.3.3 Plating. Metals shall be of a corrosion-resistant type, or shall be plated or treated to resist corrosion.
Cadmium plating shall not be used for plating any part of the flasher. Zinc and unfused tin plating shall not be used
for plating internal parts of the flasher. Zinc plating shall be in accordance with ASTM B633.
3.4 Design and construction. Flashers shall be of the design, construction, weight, and physical dimensions
specified (see 3.1). Flashers shall be designed to operate properly when mounted in any position. Construction shall
be such as to take full advantage of the design for minimum size and weight, long life, maximum reliability, and
minimum radio noise.
3.4.1 Envelope. When specified (see 3.1), flashers shall be provided with a means to permit assured contact to
case ground through a secure low resistance connection. The enclosure shall not be electrically connected to any
terminal unless specified.
3.4.2 Paralleled semiconductors. Flashers shall not utilize paralleled semiconductors for carrying rated lamp load.
3.4.3 Dimensions. The overall dimensions of the flasher shall be as specified (see 3.1).
3.4.4 Weight. The weight of the flasher shall be the minimum practicable and shall not exceed the specified
maximum weight (see 3.1).
3.4.5 Mounting means. The mounting means shall be as specified (see 3.1).
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