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MIL-R-63997B(AR)
4.7.8.4.6  Magnetic  Particle  inspection.  Upon  completion  of
the 6,000 round endurance test, the bolt from each rifle shall be
magnetic  particle  inspected  in  accordance  with  4.7.4.3.
4.7.8.4.7  Analysis.
When either a malfunction occurs or a
rifle  fails  to  meet  a  test  requirement,  a  failure  analysis  shall
be performed to determine the causes.
The  failure  analysis  shall
include dimensional and physical tests.
Components shall not be
disassembled from the rifle for inspection and test unless
determined  necessary.
4.7.8.4.8
Recording
of
data.
The following data shall be
recorded:
Inspection lot number.
a.
Rifle serial numbers.
b.
Each  malfunction  and  unserviceable
part
(see
6.5).
c.
Rifle round at which it occurred.
1.
2.
Rifle  serial  numbers.
Type  of  firing  (burst  or  semi-automatic).
3.
4.
Class  of  malfunction.
Ammunition lot number.
d.
H e a d s p a c e measurement.
e.
Each rate Of fire measurement with identification of
f.
which cycle.
Each ammunition defect.
g.
h.
The  cause  of  each  rifle  failure.
If  applicable  cause  of  test  failure.
i.
Type of magazine (30 round magazine).
j e
4.7.8.5  Failure  of  endurance  test.  Failure  of  rifles  to
meet the endurance test requirements shall be cause for deferring
further submission of product until the following have been
accomplished  and  the  subsequent  resubmittal  for  endurance  testing,
as specified in TABLE IV, has been successfully completed.
The contractor shall examine the
4.7.8.5.1  Examination.
non-conforming rifles by performing a dimensional, physical, and
visual examination, as required, of the rifle and magazine
component that are suspected to be the cause of the test failure.
4.7.8.5.2  Retest.
When the cause of the malfunction cannot
be  determined,  the  contractor  shall  provide  the  Government
representative with objective evidence of the results of this
analysis.
Upon  concurrence  of  the  Government  representative  the
contractor  shall  retest  an  additional  sample  of  four  rifles  for
Failure  of  the  additional  four
the  endurance  test  requirements.
rifles to pass endurance test requirements shall be reason for the
If  cause  of  retest  failure
contractor  to  determine  failure  cause.
cannot  be  determined,  technical  assistance  shall  be  requested
through normal contractual channels.
50

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