MIL-DTL-22931D
Subgroup I
Visual and mechanical
3.1, 3.3, 3.6 and 3.7
4.5.1
See 4.4.1.2.1
Subgroup 2
Continuity
3.4.1
4.5.2
100%
Voltage withstand
3.4.2
4.5.3
inspection
Insulation defects, spark (when applicable)
3.4.3
4.5.4
required
Insulation resistance
3.4.4
4.5.5
Pressure tighteners (when applicable)
3.5.1
4.5.11
4.4.1.2.1 Sampling plan. Statistical sampling and inspection for subgroup 1 shall be in accordance with
table III, except that the number of sample units shall be not more than two times the number of reels in
the inspection lot. No more than two sample units shall be selected from each reel of cable. When two
sample units are required from one reel, they shall be cut from each end of the reel. For subgroup 2,
each reel in the inspection lot shall be tested.
TABLE III. Sampling plan for group A and B inspections.
Inspection lot size
Sample units
Accept on
Cable length (feet)
(No. of failures)
0 to
16,000
5
16,001 to
26,000
8
26,001 to
64,000
13
64,001 to 160,000
20
0
160,001 to 440,000
32
440,001 to 2,200,000
50
2,200,001 and over
80
4.4.1.2.2 Sample unit. For subgroup 1, a sample unit is a piece of cable three feet in length and cut
from the reel of cable. For subgroup 2, the complete length of cable on each reel shall be tested.
4.4.1.2.3 Defective unit. A defective unit is any sample unit failing any test in any test group. The reel
of cable from which the sample unit was taken will be considered defective.
4.4.1.2.4 Rejected lots. If an inspection lot is rejected, the supplier may rework it to correct the
defects, or screen out the defective units, and resubmit for re-inspection. Such lots shall be separate
from new lots, and shall be clearly identified as re-inspected lots.
4.4.1.2.5 Disposition of sample units. Sample units, and the reels of cable from which the sample units
were taken which failed one or more of the inspections shall not be delivered on the contract or order.
However, insulation defects, spark failures may be repaired or the cable cut at this point (see 4.5.4), and
shipped.
4.4.1.3 Group B inspection. Group B inspection shall consist of the examinations and tests specified in
table IV, in the order shown, and shall be made on reels of cable which have been subjected to and have
passed the group A inspection.
4.4.1.3.1 Sampling plan. The sampling plan shall be in accordance with table III.
TABLE IV. Group B inspection.
Test
Requirement
Test
paragraph
paragraph
7
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