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Projectile, 155MM, HE, M692 and M731 Housing, Timing and Fuzing
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MIL-P-48189D(AR)
4.5.8
Anti-disturbance switch.
4.5.8.1 AD switch function and closure time duration.  The
switch assembly shall be placed in an approved fixture.  The fixture
shall be capable of rotating the switch assembly through 360 on
its cylindrical axis, while this axis is held at 15 2
referenced to the horizontal, for both CW and CCW directions of
rotation.
The functional requirements of drawing 9298512 shall be
met.
4.5.8.2  Insulation resistance of AD switch.  The switch
assembly, when mounted in a suitable fixture, shall be measured for
insulation resistance in the rest position using an approved
megohmmeter.
The megohmmeter reading shall meet the requirements of
drawing 9298512.  This is a non-destructive test and acceptable
parts may be returned to the lot.
4.5.8.3  Plating of AD switch components.  Five (S) components
shall be randomly selected from each plating batch.  The specimens
shall be crossed-sectioned through the axial center of the sample,
polished and examined microscopically to measure the plating
thickness.  If any sample fails to comply with the plating
requirements,  the plated batch shall be classed defective.
(Destructive test)
4.5.9 Weld test of battery and shorting bar support assembly.
A sample of one  1) part from the first ten (10) welded shall be
tested to qualify the welding equipment for use in production. In
addition, one (1) sample shall be tested after production of each
one hundred (100) welded parts as a control of welding equipment
during production.  The units shall be placed in a fixture capable
of applying the force specified on the applicable drawing.  Any
assembly in which the weld cracks or breaks when the specified force
is applied shall be classed defective.  If any defective parts are
found during qualification of welding equipment, the equipment
producing the defective assembly shall not be used in production.
If any defective assembly is found when inspection is performed for
control of the welding equipment, the equipment producing the
defective weld shall be removed from production.  Further, that
portion of production since the last weld control check shall be
returned to the contractor for corrective action.
If welding is
stopped for one (1) hour or longer the equipment shall be subjected
to the qualification test prior to use in production.  All welding
equipment removed from production because of some fault may, after
reworking,  be returned to production, providing it passes the
qualification test above.  The contractor may use coupons of the
same material and thickness as the parts being welded subject to
approval of the Contracting Officer.
57

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