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Shear test of the barrier assembly
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Projectile, 155MM, HE, M692 and M731 Housing, Timing and Fuzing
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Post retention and thread breaking strength



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MIL-P-48189D(AR)
4.5.7.2  Release and thread security of sensor assembly.  The
breakwire resistance shall be checked for continuity.  Units which
have resistance greater than 1,000 ohms shall not be subjected to
this test.  The units to be tested shall be placed in a suitable
fixture and the pressure specified in 3.4.2 shall be applied.  All
units shall be classified defective if any of the following occur:
a.  Fails to release when initially pressurized and evidenced
by the bobbin core being retained within the sensor case.
b.  The breakwire continuity is broken as evidenced by a
resistance greater than 1,000 ohms across the exposed ends of
the breakwire.
c.
The thread does not remain attached to the bobbin and post.
d.
The thread breaks during release.
e.  Any unit that does not release when initially pressurized,
but releases when the pressure is reapplied, shall be classed
defective.  This test is destructive.  Those units capable of
meeting the requirements of the test specified in 4.5.7.3 shall
be used for that test even if they failed to meet the
requirements for this test.
4.5.7.3  Tripline deployment of sensor assembly.  After the
sensor assembly has been tested in accordance with 4.5.7.2, and with
the sensor remaining in the test fixture, observation shall be made
to assure that the bobbin corer  with tripline attached, is deployed
over a vertical barrier oriented as follows:
a.  The barrier location shall be 16 feet, minimum, measured
horizontally from the sensor.
B.  Barrier height shall be 7 inches, minimum, above the top
of the sensor.  A bobbin core that impacts ground level before
the barrier or impacts the barrier shall be considered
defective.  This test is destructive.
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