MIL-F-26301G
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).
3.4.6 Threaded parts. All threaded parts shall be in accordance with FED-STD-H28. Where practical, all threads
shall be in conformity with the coarse-thread series. The fine-thread series may be used only for applications that
show a definite advantage through their use. Where a special diameter-pitch combination is required, the thread
shall be of American National Form and of any pitch between 16 and 36, which is used in the fine thread series.
Terminal threads shall be class 2A and 2B for external and internal threads, respectively.
3.4.7 Functional diagram. A connection diagram of the external wiring of the flasher shall be provided. The
diagram shall identify each terminal, shall be permanently attached to the flasher, and shall remain legible and
securely attached to the flasher during all tests required by this specification.
3.4.8 Fail safe. Flashers shall be designed so that with rated voltage applied to the input terminals, only internal
failure of the flasher timing circuitry will result in continuous rated power output from the output terminals.
3.4.9 Encapsulation. Unless otherwise specified (see 3.1), flashers shall be encapsulated.
3.5 Electrical requirements.
3.5.1 Input power. The flashers shall meet all applicable requirements of this specification when operating from
power sources as defined in MIL-STD-704, category B. Voltage transients having magnitudes and time durations as
defined therein shall not damage the flashers.
3.5.2 Input voltage. The rated input voltage of each type of flasher shall be as indicated (see 3.1). When the rated
input voltage is given as 28 volts ac or dc, the limiting input voltage for performance requirements shall be 26.3 to 29
volts. When the rated input voltage is given as 115 volts, 400 hertz (Hz), the limiting input voltage and frequency for
performance requirements shall be 107.5 to 119.5 volts, rms, and 380 to 420 Hz, respectively.
3.5.3 Load requirement. Unless otherwise specified (see 3.1), flashers shall be capable of operating the
applicable incandescent lamp load specified in table I. Unless otherwise specified, lamp ratings are considered
steady state current values.
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