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|  MIL-F-26301F
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.
TABLE I. Lamp rating.
Source voltage
Load range (amperes)
28 V dc
1.0 to 7.5
28 V 400 Hz ac
1.0 to 5.0
115 V 400 Hz ac
0.25 to 4.0
28 V ac or dc
1.0 to 15.0
3.5.4 Flash characteristics.
3.5.4.1 Flash rate. The flash rate shall be as specified in 3.5.4.1.1 and 3.5.4.1.2, as applicable.
3.5.4.1.1 Single output circuits. When flashers are tested as specified in 4.4.2.1.1, the flash rate shall be as
specified (see 3.1).
3.5.4.1.2 Dual output circuits. When flashers are tested as specified in 4.4.2.1.2, the flash rate shall be as
specified (see 3.1).
3.5.4.2 Flash cycle (on-to-off ratio). The "on" time of the flash cycle shall be considered that portion of the cycle
during which the voltage supplied to the lamp load is 90 percent or more of the rated voltage. The "off" time shall be
considered that portion when the voltage supplied to the load is less than 10 percent of rated voltage. The flash cycle
shall be as specified in 3.5.4.2.1 and 3.5.4.2.2, as applicable.
3.5.4.2.1 Single output circuits. When flashers are tested as specified in 4.4.2.2.1, the "on" time shall be 70 10
percent of the total cycle.
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