MIL-DTL-55021D
4.4 First article inspection. When required (see 6.2), first article inspection shall consist of all of the
tests in groups A, B, and C of table VI.
4.4.1 Specimen length. Unless otherwise specified herein, the length of specimens for tests shall be
as specified in the applicable test method.
4.4.2 Failures. One or more failures shall be cause for rejection of the first article sample.
4.5. Conformance inspection. Conformance inspections shall consist of the inspections listed in
groups A and B of table VI. Conformance inspection shall be performed on each lot of cable produced
under this specification.
4.5.1 Inspection lot. An inspection lot shall consist of all cables of one type and size made under
essentially the same conditions, produced on a substantially continuous basis, and offered for inspection
at one time.
TABLE VI. First article and conformance inspections.
Inspection
Requirement
Verification
Group A
Basic wire
3.4.1
4.6.1
Conductor continuity
3.6.3
4.6.8
Spark
3.6.5
4.6.4
Group B
Jacket wall thickness
3.5.3.3
4.6.11
Braid angle and shield coverage
3.4.2.1
4.6.13
Concentricity of extruded jackets
3.6.4
4.6.10
Visual and mechanical inspection
Specification sheet
4.6.1
Jacket tensile strength
3.5.3.3
4.6.9
and elongation
Dielectric strength (unshielded
3.6.1.1 and
4.6.2.1 and
and shielded)
3.6.1.2
4.6.2.2
Group C
Cold bend
3.6.2.1 and 3.6.2.2
4.6.3
Dielectric immersion
3.6.6
4.6.5
Heat resistance
3.6.7
4.6.6
Low-temperature storage
3.6.8
4.6.7
Flammability
3.6.9
4.6.12
4.5.1.1 Unit of product. The unit of product for determining lot size for sampling shall be one
continuous length of cable (see 6.2).
4.5.1.2 Sample unit. A sample unit shall consist of one of the individual lengths of the sample. Each
sample unit shall be of sufficient length to permit the performance of all applicable inspections or tests.
4.5.1.3 Specimen. A specimen shall consist of a piece of one sample unit upon which a particular
inspection or test is made.
4.5.2 Group A inspection. Group A inspection shall consist of the inspections specified in group A of
table VI. All finished cable shall be subjected to group A inspection.
4.5.3 Group B inspection. Group B inspection shall consist of those tests specified in group B of
table VI. The sample shall be selected from the inspection lots that have passed group A inspection.
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