Determination of the specific sequential test plan to be used for each ammnunition lot

Page Title: Determination of the specific sequential test plan to be used for each ammnunition lot
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MIL-R-45012E

s h a l l be fired 10-shot targets for accuracy using the procedure specified

i n 4.5.7.1.2 and the specific sequential test plan and acceptance criteria

( s e e 3.3.24.2.2 and figures 1 through 5) determined for each lot of am-

m u n i t i o n used.

4 . 5 . 7 . 2 . 1 Determination of the specific sequential test plan to

be used for each ammnunition lot.

( a ) The process qualification rifles shall be fired and targets

m e a s u r e d as specified in 4.5.7.1.2 and 4.5.7.1.3 using the lot of am-

I f the same lot of

m u n i t i o n furnished for rifle accuracy testing.

a m m u n i t i o n for establishing the process qualification rifles is to be

used for individual rifle testing, additional firing will not be re-

quired.

( b ) The ratio of the standard deviation to the average in

p e r c e n t a g e shall be calculated using the following formula:

( c ) Determination of the specific sequential test plan shall

be made by selecting the plan which has an R value numerically nearest

the above calculated R value for the ammunition being used (see figures

1 through 5).

4 . 5 . 7 . 2 . 2 Use of sequential sampling plan.

4 . 5 . 7 . 2 . 2 . 1 Determination acceptance and rejection criteria by

entering the sequential test plan at the average FM value of the process

qualification rifles and reading vertically to the intersection of the

m a x i m u m criteria curves. R e a d horizontally to the left from each inter-

s e c t i o n to fins the requirement value for each maximum criteria curve.

4 . 5 . 7 . 2 . 2 . 2 Fire one 10-shot target and calculate the FM, If the

FM is less than the maximum acceptance requirement for 1 target, accept

t h e rifle; if greater than the maximum rejection requirement for 1 target,

r e j e c t the rifle; if in between these limits, fire 2 more 10-shot targets

and calculate the average FM of the 3 targets.

4 . 5 . 7 . 2 . 2 . 3 If the average FM of the 3 targets is less than the

m a x i m u m acceptance requirement for 3 targets, accept the rifle; if the

average FM of the 3 targets is greater than the maximum rejection re-

q u i r e m e n t for 3 targets, reject the rifle; if in between these limits,

fire 3 more 10-shot targets and calculete the average FM of the 6 targets.

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