MIL-DTL-12606E
TABLE III. Group A and group B inspections.
Inspection
Requirement paragraph
Method
paragraph
Group A
4.7.1
3.2, 3.3, 3.5, and 3.6
Visual and mechanical examination
4.7.2
3.4.1
Voice coil polarity
4.7.3
3.4.2
Voice coil impedance
4.7.4
3.4.3
Dielectric withstanding voltage
4.7.5
3.4.4
Acoustic quality
Group B
4.7.6
3.4.5
Frequency response
4.7.7
3.4.6
Harmonic distortion
4.6.1.3 Group B inspection. Group B inspection shall consist of the inspection specified in table III, and shall be made on sample
units which have been subjected to and have passed group A inspection.
4.6.1.3.1 Sampling plan. A sample of parts shall be randomly selected in accordance with table IV. Each inspection sample shall
include a proportional quantity from each of the different styles (LS-445/U, M12606/01, or M12606/02) produced and to be tested. If one
or more defects are found, the lot shall be rescreened and defects removed.
TABLE IV. Group A and group B sampling plans.
Lot size
Sample size
Group A
Group B
3
Entire lot
2
to
8
3
13
9
to
15
3
13
16
to
25
5
13
26
to
50
6
13
51
to
90
7
13
91
to
150
10
20
151
to
280
11
29
281
to
500
15
34
501
to
1,200
18
42
1,201
to
3,200
22
50
3,201
to
10,000
29
60
10,001
to
35,000
29
74
35,001
to
150,000
29
90
150,001
to
500,000
29
102
500,001
and
over
4.6.1.3.2 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 reinspection. If one or more defects are found in the second sample, the lot shall be rejected and shall not be
supplied to this specification.
4.6.1.3.3 Disposition of sample units. Sample units, which have passed all the group B inspection, may be delivered on the contract
or order, if the lot is accepted and the sample units are still within specified electrical tolerances.
4.6.2 Periodic inspection. Periodic inspection shall consist of group C. Except where the results of these inspections show
noncompliance with the applicable requirements (see 4.6.2.1.4) delivery of products which have passed groups A and B shall not be
delayed pending the results of the periodic inspection.
4.6.2.1 Group C inspection. Group C inspection shall consist of the inspections specified in table V, in the order shown. Group C
inspection shall be made on sample units selected from inspection lots, which have passed the groups A and B inspections.
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