MIL-DTL-23971D
4.5.3 Failures. One or more failures shall be cause for refusal to grant first article approval.
4.5.4 Disposition of first article sample units. Sample units which have been subjected to first article testing shall
not be delivered on any contract or purchase order. The Government reserves the right to retain the sample units or
to require the supplier to furnish the sample units with the first article test report.
4.6 Conformance inspection.
4.6.1 Inspection of product for delivery. Inspection of product for delivery shall consist of groups A and B
inspections.
4.6.1.1 Inspection lot. An inspection lot shall consist of all items covered by a single specification sheet produced
under essentially the same conditions, and offered for inspection at one time.
4.6.1.2 Group A inspection. Group A inspection shall consist of the inspections specified in table III, in the order
shown.
TABLE III. Group A inspection.
Inspection
Requirement
Test method
paragraph
Paragraph
Visual and mechanical - - - - - - -
Temperature cycling screen- - - -
Average coupling - - - - - - - - - - -
3.5.1
VSWR - - - - - - - - - - - - - - - - - - -
Insertion loss - - - - - - - - - - - - - -
Isolation- - - - - - - - - - - - - - - - - -
Phase balance - - - - - - - - - - - - -
Amplitude balance - - - - - - - - - -
Seal - - - - - - - - - - - - - - - - - - - -
4.6.1.2.1 Group A Sampling plan. Statistical sampling and inspection shall be performed on an inspection lot basis
with a random sample of components selected in accordance with table IV. The acceptance levels shall be based
upon the zero defective sampling plan. No failures shall be permitted. Sample size is for Standard Military
component reliability components. Components intended for "Space Flight Applications" are defined as those with
the highest reliability level provided by this specification (sample size = 100 percent).
TABLE IV. Group A sampling plan.
Lot size
Sample size
"Space Flight Application" power divider Sample
(Standard Military)
size (highest reliability level)
1 - 13
100 percent
100 percent
14 - 150
13
100 percent
151-280
20
100 percent
281-500
29
100 percent
501-1,200
34
100 percent
1,201-3,200
42
100 percent
3,201-10,000
50
100 percent
4.6.1.2.2 Group A 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. Such lots shall be separate from new lots, and shall
be clearly identified as reinspected lots.
4.6.1.3 Group B inspection. Group B inspection shall consist of the inspections specified in table V, in the order
shown, and the sample shall be selected from inspection lots that have passed group A inspection.
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