MIL-DTL-16225C
4.3.1 Lot. All loudspeakers offered for delivery at one time shall be considered a lot for purposes of
sampling and inspection.
4.3.2 Conformance inspection. Conformance inspection shall consist of the examination and tests
specified in 4.3.2.1, 4.3.2.2, and 4.3.3.3. The samples shall be subjected to the tests in the order shown.
4.3.2.1 Acoustical quality test. Each loudspeaker shall be subjected to the acoustical quality test
specified in 4.4.5. If any loudspeaker fails this test it shall be rejected.
4.3.2.2 Group A inspection. Group A inspection shall consist of the inspections specified in table II, in
the order shown.
4.3.2.2.1 Sampling plan. A sample of parts shall be randomly selected in table III. If one or more
defects are found, the lot shall be rescreened and defects removed.
4.3.2.2.2 Rejected lots. If an inspection lot is rejected, the contractor may rework it to correct the
defects, or screen out the defective units, and resubmit for re-inspection. If one or more defects are
found in the second sample, the lot shall be rejected and shall not be supplied to this specification.
TABLE II. Group A inspection.
Tests
Requirement
Test
paragraph
paragraph
Visual, dimensional and
mechanical examination
Volume control
Input impedance
Insulation resistance
TABLE III. Group A and group B sampling plans.
Lot size
Sample size
Group A
Group B
1/
Entire lot
2
to
8
3
1/
13
9
to
15
3
16
to
25
13
3
26
to
50
13
5
51
to
90
13
6
91
to
150
13
7
151
to
280
20
10
281
to
500
29
11
501
to
1,200
34
15
1,201
to
3,200
42
18
3,201
to 10,000
50
22
10,001
to 35,000
60
29
35,001
to 150,000
74
29
150,001
to 500,000
90
29
over 500,000
102
29
1/ Inspection sample size shall not exceed lot size.
4.3.3 Group B tests. The group B tests shall consist of those specified in table IV.
4.3.3.1 Sampling plan. A sample of parts shall be randomly selected in table III. If one or more defects
are found, the lot shall be rescreened and defects removed.
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