MIL-DTL-21604F
4.6 Qualification inspection requirements for switches not covered by specification sheets. Qualification inspection
requirements for switches not covered by 3.3.1 shall be performed by the supplier after award of contract and prior to
full-scale production. Unless otherwise specified (see 6.2), inspection shall be as specified in 4.5.
4.6.1 Samples. Unless otherwise specified (see 6.2), the samples and test routine shall be as specified in 4.5.1
and table II. This acceptance is valid only on the contract under which it is granted unless extended by the
Government to another contract. Samples subjected to this inspection shall not be delivered on the contract or order.
4.6.2 Failures. One or more failures shall be cause for refusal to grant inspection acceptance.
4.7 Conformance inspection.
4.7.1 Inspection of product for delivery. Inspection of product for delivery shall consist of groups A, B, and C
inspection.
4.7.1.1 Inspection lot. An inspection lot shall consist of switches of the same basic design, produced under
essentially the same conditions, and offered for inspection at one time.
4.7.1.2 Group A inspection. Sample switches shall be selected from each lot in accordance with table IV.
Examinations and tests shall be conducted in the order listed.
TABLE IV. Group A inspection.
Examination
Examination or test
Requirement
and test method
Circuit configuration
Visual and mechanical examination
3.20 and 3.21
Dielectric withstanding voltage
4.7.1.3 Sampling plan. As a minimum, the contractor shall inspect a sample quantity of switches in accordance
with the sampling plan defined herein. Sample size depends on classification of the characteristic as shown in table
V. If one or more defects is found in any sample, the entire lot shall be rejected and screened 100 percent by the
contractor for the defect found.
TABLE V. Sampling plan.
Lot size
Critical characteristic
All
2 to
8
All
9 to
15
All
16 to
25
All
26 to
50
All
51 to
90
125
91 to
150
125
151 to
280
125
281 to
500
125
501 to 1,200
125
1,201 to 3,200
192
3,201 to 10,000
294
10,001 to 35,000
294
35,001 to 150,000
10
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