MIL-DTL-3950J
4.7.2.1.1 Sampling plan. The sampling plan and test procedures shall be as specified in the appendix
to this specification. The sample units shall be selected from current production. If switches are not in
current production, they may be selected from stock; however, all switches shall be date coded within 24
months of the required group B submittal date. When there has been no production of a particular type of
switch for a 3-year period, sample units shall be selected from the next production lot presented for
acceptance and for each subsequent 3-year period.
4.7.2.1.2 Noncompliance. If a sample fails to pass group B inspection, the supplier shall take
corrective action on the materials or processes, or both, as warranted, and on all units of product which
can be corrected and which were manufactured under essentially the same conditions, with essentially
the same materials, processes, etc., and which are considered subject to the same failure. Acceptance
of the product shall be discontinued until corrective action, acceptable to the preparing activity, has been
taken. After the corrective action has been taken, group B inspection shall be repeated on additional
sample units (all inspections, or the inspection which the original sample failed, at the option of the
preparing activity). Group A inspection may be reinstituted; however, final acceptance shall be withheld
until the group B reinspection has shown that the corrective action was successful.
TABLE V. Group B inspection.
Specimen
Requirement
Test
Inspection
paragraph
paragraph
1
2
3
4
5678
9 10 11 12
Mechanical endurance..........................
x
x
Electrical overload, electrical
endurance, intermediate current,
low-level life, and temperature rise .....
Overload current .............................
x
x
x
x
Resistive load (ac) 1/......................
x
x
Inductive load (altitude) 2/ ..............
x
x
Life, low level ..................................
x
x
Temperature rise.............................
x
x
Contact voltage drop.............................
x
x
Shock....................................................
x
x
Salt spray (corrosion)............................
x
x
Solderability ..........................................
x
x
Dielectric withstanding voltage
(At atmospheric pressure) ..................
x
x
x
x
Examination of product .........................
x
x
x
x
x
x
x
x
x
x
x
x
Switching characteristics ......................
x
x
x
x
x
x
x
x
x
x
Switch sealing 3/.................................
x
x
x
x
x
x
x
x
x
x
1/ Test at 115 volts, 60 Hz, 71°C.
2/ Test at 28 V dc, 65,000 feet.
3/ Only the odd-numbered specimens shall be opened by the manufacturer.
12
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