MIL-DTL-27072E
4.3 Methods of inspection.
4.3.1 Visual and mechanical inspection. Cable, components, and wire shall be subjected to a
thorough visual and mechanical inspection to ascertain that the material, construction, workmanship,
marking, colors, diameters/thicknesses, and lengths are in accordance with the applicable requirements.
In the event of dimensional discrepancy, 5 feet (1.52 mm) shall be cut from the end of the sample and the
dimensions shall be re-measured beyond this 5 foot (1.52 mm) point.
4.3.1.1 Length of lay. The length of lay shall be determined in accordance with method 1521 of
4.3.1.2 Shield coverage. Shield coverage shall be determined by method 8121 of FED-STD-228,
except that the formula specified in 3.5.2 shall be used for the calculation.
4.3.1.3 Outside diameter. The outside diameter of the cable shall be measured using method1331 of
4.3.1.4 Wall thickness of jackets and sheaths. The wall thickness of jackets and sheaths shall be
4.3.2 Cable sheath tests.
4.3.2.1 Tensile strength. The tensile strength test shall be conducted in accordance with method
3021 of FED-STD-228.
4.3.2.2 Ultimate elongation. The ultimate elongation test shall be conducted in accordance with
method 3031 of FED-STD-228. Benchmarks on test specimens shall be 2 inches (50.80 mm) apart
before tensile loading is applied.
4.3.2.3 Accelerated aging. The aged tensile strength and ultimate elongation of sheath material A
(see table V) shall be calculated using the accelerated aging test conducted in accordance with method
4031 of FED-STD-228.
4.3.3 Conductor resistance. Conductor resistance shall be measured in accordance with method
6021 of FED-STD-228. The added length of conductor, due to cabling, shall be determined by the length
of lay of the conductor and the mean diameter of the layer.
4.3.4 Dielectric strength. The dielectric strength test shall be conducted in accordance with method
6111 of FED-STD-228, except that the shielded specimens shall be tested dry against the shield as a
ground electrode.
4.3.5 Cold bend. Two specimens shall be subjected to the cold bend test at the temperature
indicated in table XIII. The specimens shall be placed in a cold chamber in a non-flexed position and
maintained at the required temperature for a minimum of 16 hours. Without removal from the cold
chamber, each specimen shall be bent around a mandrel with a diameter specified in table XIII for one
complete turn. Upon removal from the chamber, the specimen shall be examined for conformance
specified in 3.7.3. The insulated conductors shall be removed from the cable and shall be subjected to
the dielectric strength withstand test of the applicable basic wire specification (see table II).
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