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|  MIL-S-13261G(AR)
4.5.2.3.1 Fixture fired. The packed signals shall be
conditioned for a mimimum of 16 hours at cold temperature. The
packed signal shall be taken from the conditioning chamber, removed
from the metal container and fired vertically from a fixture (See
4.4.4). The functioning performance of the sample shall be observed
for compliance with the requirements.
Samples must be fired within 60 seconds of removal
NOTE:
from the conditioning chamber.
4.5.2.3.2 Hand
fired. The packed signals shall be conditioned
for a minimum of 16
hours at cold temperature. The packed signal
shall be taken from
the conditioning chamber, removed from the metal
container and fired
vertically by hand (See 6.4). The performance
of the signal shall
be observed for compliance with the requirements.
NOTE:
Samples must be fired within 60 seconds of removal
from the conditioning chamber.
4.5.2.4 Test validity. If for any reason the proving ground
considers that the test conditions have detrimentally affected the
test results, the test shall be declared invalid and a new test
performed with additional samples.
4.5.3 Leakage. The packed sealed container shall be placed in
the test cylinder. Apply air in the cylinder to a pressure of 3 to
5 pounds per square inch (p.s.i.) and hold for eight (8) seconds
min. Observe pressure indication for a drop in pressure during the
holding time. Any assembly that fails to comply with the
requirement shall be classed defective and removed from the lot.
4.5.4 Container tear strip test. The tear strip of the
container shall be tested in accordance with the Procedures
specified in section 4 of MIL-C-10464 for compliance with the
requirements specified. If any container fails to comply with the
requirements, it shall be classed defective.
4.5.5 Density of propellant grain.
4.5.5.1 Overall density. The propellant grain shall be
accurately measured, the volume determined and converted to cubic
centimeters. The grain shall then be accurately weighed and the
density in grams per cubic centimeter calculated and compared with
the requirements. Any propellant grain that fails to comply with
the requirements shall be classed defective and removed from the lot.
4.5.5.2 Density of any section. Each of the grains shall be
cut into two (2) approximately equal size cylinders. Each cylinder
shall be accurately weighed. Fill the beaker with clean mercury,
insert the immersing fixture and level off the mercury by pressing
down with the flat glass plate until it is even with the top of the
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