MIL-PRF-15160K
4.5.1.3.1 Sampling plan. The sampling plan for group B inspection shall be as specified in table VII.
TABLE VII. Group B inspection sampling plan.
Lot size
Sample
Accept
Reject 1/ 2/ 3/
size
2 to
15
2
0
1
15 to
25
3
0
1
26 to
90
5
0
1
91 to 150
6
0
1
151 to 280
7
0
1
281 to 500
9
0
1
501 to 1,200
11
0
1
1,201 to 3,200
13
0
1
3,201 to Over
15
0
1
1/ If there are any failures in a sample size, the defective fuses shall
be removed from the sample size and the remaining fuses shall be
returned to the lot. Defective fuses shall be replaced with new
fuses, when available.
2/ This procedure shall be repeated until the sample size conforms to
the accept criteria at which time the lot is accepted.
3/ At the option of the manufacturer, in-process inspection such as
Statistical Process Control, which includes inspection of all of the
inspections or tests specified in table VI, may be used after
approval from the qualifying activity in lieu of the sampling plan
specified in table VII. All of the in-process control data for these
tests shall be made available to the qualifying activity upon request.
4.5.2 Periodic inspection. Qualification verification inspection shall consist of group C. Except where the results of
these inspections show nonconformance with the applicable requirements (see 4.5.2.1.4), delivery of products which
have passed group A and group B shall not be delayed pending the results of these qualification verification
inspections.
4.5.2.1 Group C inspection. Group C inspection shall consist of the tests specified in table VIII in the order shown.
Group C inspection shall be made on sample units selected from inspection lots which have passed the group A and
group B inspection, unless the Government considers it more practical to select from current production. A
manufacturer's normal quality control tests, production tests and others may be used to fulfill all or part of group C
inspections; however, all of group C inspection shall be completed as specified.
4.5.2.1.1 Sampling plan. Unless otherwise specified (see 3.1), the number of fuses to be subjected to group C
inspection shall be as shown in table VIII. The number shown in the table shall be for each of the maximum and
minimum current and voltage ratings of each style and characteristic shown on the specification sheet for which
qualification retention is desired. The tests shall be conducted 36 months after the date of notification of qualification
and after each subsequent 36-month period. When production of a particular type of fuse has been suspended for 36
months or more, sample units shall be selected from the first lot of the new production presented for acceptance, and
after each subsequent 36-month period.
4.5.2.1.2 Failures. If one or more sample units fail to pass group C inspection, the sample shall be considered to
have failed.
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