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MIL-R-63997B(AR)
4.7.5.4.3  Second  retest.
In  the  event  the  rifles  fail  in  the
retest, the procedure In 4.7.5.4.1  shall  be  followed.
The  rifles
shall be retested, by firing three (3) thirty round sequences in
accordance  with  4.7.5.3.1  and  4.7.5.3.3  and  the  cyclic  rate  shall
be recorded.
Rifles  shall  operate  without  malfunction  or
unserviceable  parts  and  shall  meet  the  cyclic  rate  of  fire
requirements.
Process
control
criteria.
4.7.5.5
4 . 7 . 5 . 5 . 1  P r o c e s s  a v e r a g e  The process average for total
r i f l e s  t e s t e d  f o r  f u n c tion
fring
during
one s h i f t  s h a l l  n o t
T h i s p r o c e s s a v e r a g e f o r eachshift shall
exceed 2.0% defective.
b e m a i n t a i n e d a n d b e a vailable for Government review
4.7.5.5.2  Failure  classification.
When the process average
exceeds 2.0% defective d u r i n g  o n e  s h i f t ,  t h e  c o n t r a c t o r  s h a l l
review the failure causes for determination of a seriousness,
Class  I,  II  or  III  malfunction  (see  6.5.5).  The  contractor,  in
a d d i t i o n ,  s h a l l  p r o v i d e  t h e  g o v e r n m e n t  r e p r e s e n ta t i v e  w i th
objective evidence of his determination.
4.7.5.5.2.1  Class  II  or  III  malfunction.  When  the
malfunction  cause  is  classified as  Class  II  or  III,  the  contractor
shall  institute  corrective  action  in  the  manufacturing  processes
and associated quality COntrol procedures to preclude recurrence
of the cause and to assure that all rifles and components
containing  similar  defects  are  purged  from  the  prime  and  vendor  or
When authorized by the Government
prime or vendor facilities.
representative,  this  corrective  action  need  not  include  the
Upon
screening  of  rifles  previously  tested  for  function  firing.
completion of the preceding the  contractor  shall  recondition  the
rejected  rifles  and  retest  the  rifles  as  specified  in  4.7.5.4.2.
4.7.5.5.2.2 Class I malfunction. When the malfunction is
classified as Class I or the malfunction cause cannot be
determined, the contractor shall correct the rejected rifles and
shall  test  the  first  eighty  rifles  on  the  following  shift  by
firing  two  thirty  round  sequences  in  accordance  with  4.7.5.4.2.
When the number of malfunctions occurring during the test of
e i g h t y  r i f l e s  e x c e e d s  o n e , the contractor shall continue function
firing  acceptance  testing  in  accordance  with  4.7.5.4.2  until
corrective action has been accomplished to the applicable
manufacturing process or quality assurance procedures or both, as
evidenced by the testing of eighty consecutive rifles with one or
I n the event the malfunction number is one or
less  malfunctions.
less  during  this  test,  normal  function  firing  testing  shall  be
resumed for all subsequent rifles submitted during this shift
39

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