MIL-C-70714 (AR)
4.4.3.4. Alternate sampling plan for examination of depth and
diameter of rear shear pin holes. The depth and diameter of the
shear pin holes shall be inspected in the following manner using
approved gages.
4.4.3.4.1 First production shift examination. Beginning with
the first production shift, ten (10) consecutive drilled units
shall be inspected and found defect free prior to rate
production. Then inspect five (5) units every 1/2 hour until the
end of the shift. Five (5) units shall be inspected at the end of
the shift. If a defect is found in any of the five (5) units, the
machine set up shall be adjusted until ten (10) consecutive units
are defect free.
4.4.3.4.2 Second production shift examination. After
successfully completing the sampling of 4.4.3.4.1 for one eight
hour production shift with no defects, the sampling plan may be
reduced to five (5) drilled units being inspected every one hour
and at the beginning and at the end of the shift. If a defect is
found the sampling plan of 4.4.3.4.1 will be reinstated.
4.4.3.4.3 Third production shift examination. After
successfully completing the sampling plan of paragraph 4.4.3.4.2
for one eight hour production shift with no defects the sampling
plan may be reduced to three (3) drilled units being inspected
every hour and at the beginning and end of the shift. If a
defect is found, the sampling plan of 4.4.3.4.2 will be reinstated.
4.4.3.4.4 Fourth production shift examination. After
successfully completing the sampling plan of paragraph 4.4.3.4.3
for one eight hour shift with no defects, the sampling plan may be
reduced to two (2) drilled units being inspected every two hours.
If a defect is found, the sampling plan of 4.4.3.4.3 will be
reinstated.
4.4.3.4.5 Tooling change. A change of tooling will require a
first piece inspection prior to continuing production. The
sampling plan will be the same as that prior to the tooling change.
4.4.3.4.6 Production lapse. A stop in production of over two
months will require starting the inspection at the first
production shift plan.
4.4.3.5 Proving ground. Fifty sample cartridges shall be
selected for this test. The test shall be performed as specified
in 4.4.5.7. Defect classification and individual accept/reject
criteria shall be in accordance with the following table.
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