MIL-DTL-55021D
4.5.3.1 Sampling. A random sample shall be selected from the inspection lot. The sample size shall
be based on the inspection lot size from which the sample was selected for group A inspection. Sample
size for inspection shall be in accordance with table VII.
4.5.3.2 Specimen length. Unless otherwise specified herein, specimens for group B inspection shall
be of the length specified in the applicable test method.
4.5.4 Rejected lots. Failure of any sample to pass these inspections shall constitute a failure of the
lot. If an inspection lot is rejected, the contractor may rework the lot to correct the defects, or screen out
the defective units and resubmit the lot for re-inspection. Such lots shall be separated from new lots and
shall be identified as re-inspected lots (see 4.5.5).
TABLE VII. Inspection sample.
1/
Inspection lot size
Sample size
1
1
2 to 8
2
9 to 90
3
91 to 150
12
151 to 280
19
281 to 500
21
501 to 1,200
27
1,201 to 3,200
35
3,201 to 10,000
38
10,001 to 35,000
46
1/ Lot size is based on the number of continuous lengths of cable.
4.5.5 Noncompliance. If a sample fails to pass group B inspections (see 4.5.3), the contractor shall
notify the cognizant inspection activity of such failure and shall take corrective action on the materials,
processes, or both, as warranted, on all units of the product. Acceptance and shipment of the product
shall be discontinued until corrective action has been taken. After the corrective action has been taken,
group B inspection shall be repeated on replacement articles. (This includes all test and examinations, or
only the test that the original sample failed, at the option of the cognizant inspection activity.) Group A
inspection may be re-instituted; however, final acceptance and shipment shall be withheld until group B
inspection has shown that the corrective action was successful. In the event of failure after re-inspection,
information concerning the failure shall be provided to the cognizant inspection activity.
4.6 Methods of inspection.
4.6.1 Visual and mechanical inspection. Cable, components, and wire shall be subjected to a
thorough visual and mechanical inspection to ascertain that the materials, construction, workmanship,
marking, colors, dimensions, and lengths are in accordance with the applicable requirements.
4.6.2 Dielectric strength.
4.6.2.1 Unshielded cable. The unshielded cable dielectric strength test shall be conducted in
accordance with method 6111 of FED-STD-228 between each conductor and other conductors at the
applicable voltage specified in table IV. The minimum immersion period is 4 hours for
unshielded/unjacketed cables. Immersion is not required for jacketed cables.
4.6.2.2 Shielded cable. The shielded cable dielectric strength test shall be conducted in accordance
with method 6111 of FED-STD-228. The applicable test voltage (see table IV) shall be applied between
the conductor and shield for singles and between each conductor and the other conductors and shield in
common for pairs and triples. Immersion is not required.
9
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