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|  MIL-F-20420J(AR)
4.5.4 Functioning
4.5.4.1 Ambient temperature (21 2.8C) (70 5F). The
flares shall be conditioned for a min. of 16 hours at ambient
temperature. After conditioning, the flares shall be functioned
within 5 minutes utilizing the test equipment specified on dwg.
9247118, using the operating instructions specified on dwg.
9247119. The flare assemblies shall be fired, the pull forces
recorded and burning times of all flares shall be determined by
means of an approved measuring device.
(Destructive Test)
a. One-half of the sample flares shall be set-up with the
trip wire connected to the pull pin that has been assembled in lieu
of the safety clip. The flares shall be fired and observation made
for compliance with the applicable requirements.
b. One-half of the sample flares shall be set-up with the
trip wire connected to the trigger. One-half of these flares shall
be fired as specified in "a" and observation made for compliance
witht he applicable requirement. The remaining half of the flares
shall be fired by cutting the trip wire and observation made for
compliance with the applicable requirement.
4.5.4.2 Cold temperature (minus 34.5 2.8C) (minus 30
5F).
The flares shall be conditioned for a min. of 16 hours at a
temperature of (minus 34.5 2.8C) (minus 30 5F). The
flares shall be taken from the conditioning chamber and fired within
5 minutes by removing the pull pin. The burning time and the pull
pin force shall be determined by the same method used in 4.5.4.1.
(Destructive Test)
4. 5.4.3 Temperature and humidity cycling. The flare assemblies
shall be tested in accordance with the procedure specified in
MIL-STD-331, except that the time duration of the test shall be
limited to the first 48 hours, and timing shall not start until the
end of the initial conditioning at (minus 54C) (minus 65 F).
At the end of the test period, the flare assemblies shall be allowed
to return to ambient temperature (21 2.8C) (70 5F) prior
to functioning. The burning time, pin pull force, and trigger pull
force shall be determined by the same methods used in 4.5.4.1.
(Destructive Test)
4.5.5 Water submersion test. The filled and sealed packages,
after conditioning at ambient temperature (21 2.8C) (70
5F for at least four (4) hours, shall be tested for leakage by
submerging in water in a large drum. The water in the drum shall be
maintained at (32.2 2.8C) (90 5F). The package
shall be held beneath the surface of the water for thirty (30)
seconds minimum while observation is made for leakage. The package
shall be inverted and the procedure repeated. A steady stream or
recurring stream of bubbles from any surface shall be cause for
rejection. Where there is no emission of bubbles observed, the
package shall be dried, opened and inspected. Evidence of water in
(Non-Destructive)
the barrier bag shall also be cause for rejection.
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