MIL-DTL-20517J (AR)
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 the igniting hole in the fuze assembly and secured in place, leaving approximately
five (5) centimeters of one end of the strand free. An electric match or squib shall be
used to ignite the free end of the quickmatch which shall in turn ignite the fuze as
intended. With either ignition method, if an assembly fails to ignite, wait for a safe
period of time and attempt ignition a second time. In the event that the item fails to
function after the second ignition trial, substitution of that item shall be permitted. The
substituted item is permitted two attempts at ignition before it is deemed a failure.
Therefore, a total of four attempts at ignition on two charge cases are permitted before the
data point is considered a failure. In no case shall more than one (1) substitution be
permitted for any one item. 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 requirement on drawing 8848483. Damaged
enclosure that may pass non-fragmented parts of the charge case must be repaired prior to
testing.
4.5.5 Dynamic functioning. The simulators shall be immersed in water at 21 ±
5°C for a minimum of two (2) hours to a depth of fifteen (15) to twenty three (23)
centimeters. The simulators shall be removed from the water and the exterior surfaces
wiped dry. Within one (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. Any simulator not fired within
one (1) hour shall be reconditioned in the two (2) hour water immersion.
4.5.6 Air leakage. 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 155 mmHg by means of a fixed volume of air. With the air
supply shut off the pressure shall be maintained for a minimum of 15 seconds. An
accurate measuring instrument shall be observed for evidence of simulator leakage.
4.5.7 Radiographic examination. For the end items, one (1) exposure shall be
made of each simulator oriented in the vertical position (primer end down) using a
horizontal X-ray beam. The beam shall be aligned with the inner shoulders of the signal
case. For the fuze assemblies, one (1) exposure shall be made of each assembly. The units
(end items and fuze assemblies) shall be radiographically inspected and compared to
radiographic standards for detection of defects in accordance with 4.4.9. Any end item or
fuze assembly deemed unacceptable shall be removed from the lot.
4.5.7.1 Radiographic standards. Radiographic standards shall be made out of live
materials and show the following conditions: (see 6.3)
For end items:
a. One (1) acceptable simulator (showing full amount of propellant, full delay
column and correct overall assembly).
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