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MIL-S-20517H (AR)
Determine the percentage of black powder by subtracting the
percentage of aluminum from 100.0 percent.
When blending is accomplished in individual charge cases, the
adequacy of the composition may be determined by emptying one or
more of the partially mixed charges from the charge cases before
they have been closed, blending the ingredients and performing an
analysis on the sample of the mixture.
4.5.4 Charge case assembly.  The charge case assemblies shall
be suspended by means of a cord or thread at least three (3) feet
from any solid object.  They shall be functioned through the fuze
assembly by means of an electric match or squib.  An alternate
method of initiating the charge may be used as follows:  A strand of
quickmatch shall be wrapped around both igniting holes in the fuze
assembly and secured in place, leaving approximately two (2) inches
of one end of the strand free.  An electric match or squib shall be
used to ignite the free end of the quickmatch which will in turn
ignite the fuze as intended.  If an assembly fails to ignite, a
second trial with the quickmatch should be made after a safe waiting
period.  In the event the item fails to function after two (2)
ignition trials, substitution of a second item will be permitted
regardless of the ignition method used.  In no case will more than
one (1) substitution be permitted in any one test sample.  Testing
must be done in an enclosure designed to permit the escape of the
blast pressure yet retain most of the metal or tube pieces.
Observation shall be made to determine compliance with the drawing
requirement.
4.5.5 Functioning.  The simulators shall be immersed in water
at 70 10F hours to a depth of 6 to 9 inches.  The
simulators shall be removed from the water and the exterior surfaces
wiped dry.  Within 1 hour after removal from the water, the
simulators shall be fired at an approximate 45 degree angle of
elevation from an M8 pyrotechnic pistol that has been mounted in a
suitable fixture set up on the ground.  The simulators shall be
observed for functioning to determine compliance with the
requirements of 3.4.
4.5.6.  Chamber gaging.  The assembly shall be gaged with
equipment specified in 4.4.4.
4.5.7 Air leakage test.  The simulator assembly shall be placed
in a cylindrical air tight chamber with the free space minimized.
The air pressure within the chamber shall be raised to a minimum of
3 p.s.i.g. by means of a fixed volume of air.  With the air supply
shut off the pressure shall be maintained for 15 seconds min. An
accurate measuring instrument shall be observed for evidence of
simulator leakage.
36

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