MIL-F-26301G
4.4.2.2 Flash cycle (on-to-off ratio) (see 3.5.4.2). Flashers shall be tested at an atmospheric pressure of
approximately 29.92 inches and a room temperature of 23°C ±5°C over the input voltage range specified in 3.5.2.
4.4.2.2.1 Single output circuits (see 3.5.4.2.1). Flashers shall be operated for 5 minutes for compliance with the
flash cycle requirements by loading in turn with a maximum and minimum lamp load as specified in table I. The flash
cycle shall be as specified in 3.5.4.2.1.
4.4.2.2.2 Dual output circuits (see 3.5.4.2.2). Flashers shall be operated as specified in 4.4.2.2.1 except that the
operation cycle shall be 10 minutes. The flash cycle shall be as specified in 3.5.4.2.2.
4.4.2.3 Switching time (see 3.5.4.3). Flashers shall be tested with rated input voltage and rated lamp load applied
(see 3.1).
4.4.3 Voltage drop (see 3.6). Flashers shall be operated for 10 minutes each at minimum rated and maximum
rated voltages, and maximum rated lamp load. Unless otherwise specified (see 3.1), the voltage drop in the lamp
load shall not exceed 4.0 percent of the applied input voltage.
4.4.4 High and low temperature soak and operation (see 3.7). Environmental tests shall be conducted in
accordance with the following procedures of MIL-STD-810.
4.4.4.1 High temperature (see 3.7.1). Flashers shall be subjected to high temperature testing in accordance with
procedure I, method 501 of MIL-STD-810, except that the soak period shall be for 24 hours in lieu of 48 hours. At the
completion of the 24-hour soak period, the flashers shall be operated at the soak temperature (71°C) and tested as
4.4.4.2 Low temperature (see 3.7.2). Flashers shall be subjected to low temperature in accordance with
procedure I, method 502 of MIL-STD-810. Flashers shall be exposed to, but not operated in, an ambient
temperature of -62°C for a period of 48 hours. The temperature of the chamber shall be raised to -54°C and
maintained for an additional 24 hour period or until temperature stabilization is reached. While the flashers are being
maintained at -54°C, the minimum specified input voltage shall be applied to the input terminals and the minimum
specified lamp load connected to the output. The flashers shall begin to operate at the specified flash rate (see 3.1)
within 30 seconds after the input power is applied. Operation shall continue at the low temperature for a period of 10
minutes with the voltage held at the same rated value as was used to start the flasher. At the end of the test, flashers
shall be tested as specified in 4.4.2.1, 4.4.2.2, 4.4.2.3, and 4.4.3, as applicable, except that the flashers shall be
operated at rated voltage and rated lamp load (see 3.1).
4.4.5 Vibration (see 3.8). Flashers shall be subjected to vibration in accordance with procedure I, curve AT,
method 514, of MIL-STD-810, except the frequency range shall extend from 500 Hz to 1500 Hz at 10 G's. During the
entire test, the flashers shall be operated and connected to flash the lamp load specified in 4.4.14. Flashers shall be
tested as specified in 4.4.2.1, 4.4.2.2, 4.4.2.3, and 4.4.3, as applicable, except that flashers shall be tested at rated
input voltage and rated lamp load (see 3.1).
4.4.6 Immersion (3.9).
4.4.6.1 Gasoline resistance. Flashers shall be immersed in a high-test gasoline of any grade conforming to
ASTM D910 for a period of 1 hour at a temperature of 23°C ± 5°C. Flashers shall then be removed from the test fluid
and allowed to drain for 1 hour at room temperature. There shall be no swelling of seals, gaskets, or other
components. There shall be no separation of components, dissolving of compounds or adhesives, or deterioration
that would cause the flashers to fail if exposed to gasoline in service.
4.4.6.2 Jet fuel resistance. Flashers shall be immersed in JP-4 fuel conforming to MIL-DTL-5624 for a period of 1
hour at a temperature of 23°C ±5°C. Flashers shall then be removed and allowed to drain for 1 hour at room
temperature. There shall be no swelling of seals, gaskets, or other components. There shall be no separation of
components, dissolving of compounds or adhesives, or deterioration that would cause the flashers to fail if exposed
to jet fuel in service.
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