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MIL-P-45172F(MU)
4.4.5 Automatic eddy current inspection effectiveness. -Equipment checkout
shall be performed as stated in the Operation Instruction Manual at the
start of each shift and after any adjustment or shutdown.  Upon completion
of checkout, cycle the PCS #1, front slot and rear slot standards through
the inspection system during automatic operation.  All three standards
must be rejected to assure correct adjustment for reject level and scan
limits.  During remainder of shift the PCS #1 shall be cycled through the
equipment at intervals of 20 5 minutes during automatic operation.
4.4.5.1 Equipment verification. -The Government inspector will maintain
independent  of the contractor, a set of standards and may cycle these
standards tnrough the equipment at any time.  Failure of equipment to
reject standards will be evidence that the equipment is not properly
adjusted and the contractor will be so notified.
4.4.6 Soundness verification. -After equipment checkout and verification
as specified in 4.4.4 and 4.4.4.1 the entire lot sample will be inspected
with the equipment operating automatically.  Any rejected unit of the sample
will be automatically cycled through the equipment with the CAL. button
pressed (to lower the sensitivity one step below that used for production
inspection).  Any unit which is rejected at the lower sensitivity shall be
classed as a defective.
4.4.7 Phosphate coating. -The method of test shall be as prescribed by
TT-C-490 for the type of coating used (see Dwg. D7258805). The prescribed
panels shall be processed, with the projectiles to be represented, at the
start of daily production and at 4-hour intervals, maximum, thereafter.
Appearance and weight of the coating shall be recorded.
4.4.8 Paint adhesion. -The method of test shall be in accordance with
TT-C-490. The test shall be made on the painted bourrelet of each unit of
the sample forward of the rotating band.  Visible exposure of underlying
phosphate coating or ferrous metal of any unit of the sample, as a result
of the test, shall be recorded as a defect.
4.4.9 Corrosion resistance. -The method of test shall be in accordance
with ASTM B117-64.  The paint shall not be disturbed, however, the rotating
band and unpainted surfaces of the sample projectiles may be masked out by
a wax coating or other suitable material.  The salt spray solution and
exposure time shall be as specified in 3.7.3.
4.4.10 Metal parts security .-The method of test will be in accordance with
AMCR 715-505, Volume 8.  The test sample metal parts shall be inert charged
and assembled into cartridges in accordance with the requirements of Dwg.
D7259192, Cartridge, 20mm, for Projectile, API, M53, Metal Parts Test. The
test cartridges, at ambient temperature, will be fired in bursts of 50 shots
in an M39 gun. The gun barrel will be at ambient temperature for the firing
of each burst.  The cyclic rate of fire will be recorded for informational
purposes.
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