MIL-DTL-3950J
TABLE III. Group A inspection.
Requirement
Test method
Inspection
Sampling plan
paragraph
paragraph
Subgroup 1
Examination of product
Material
Interface and Physical dimensions
Marking
Workmanship
Subgroup 2
Switch sealing
4.8.19.1(b)
Switching characteristics
See 4.7.1.2.1.2 1/
Dielectric withstanding voltage
Contact voltage drop
1/ At the option of the contractor, documented in-process inspection may be used to
satisfy the requirements provided that all of the contractor's in-process control data
on these tests are made available to the Government upon request.
TABLE IV. Zero defect sampling plan.
Minimum number of switches to be tested 1/
Lot Size
Subgroup 1
Subgroup 2
1-
8
All
All
9-
15
5
All
16 -
50
5
13
51 -
90
7
13
91 -
150
11
13
151 -
280
13
20
281 -
500
16
29
501 - 1,200
19
34
1,201 - 3,200
23
42
3,201 - 10,000
29
50
10,000 - 35,000
35
60
1/ For lot sizes that are less than the required sample size, all switches
shall be tested.
4.7.2 Periodic inspection.
4.7.2.1 Group B inspection. Group B inspection shall be completed in accordance with table V, in the
order shown, within each 3-year period after initial qualification. When a manufacturer has switches
qualified under various MS standards or specification sheets, the qualifying activity may authorize group
B tests that do not require redundant testing on similar product features. Group B inspection shall be
performed on sample units that have been produced, using the same manufacturing facilities and
processes normally used in production and which have passed group A inspection. A manufacturer's
normal quality control tests, production tests, and environmental tests may be used to fulfill all or part of
group B inspection; however, all of group B inspection shall be completed as specified. Data used may
be accumulated within the previous 24 months.
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