MIL-DTL-87218E
specified in table II for all 3 specimens. The SV values shall be calculated and shall fall
within the SV values specified in table II for all 3 specimens.
4.4.4 Coefficient of thermal expansion check. Three specimens shall be prepared for
each type and class of lockclad for which qualification is desired. Specimens may be continuous
lockclad or may terminate in bare base wire rope with terminals swaged thereon. Designate and
measure a length of not less than 2.5 feet of cladding on each assembly. Specimens shall be
tested for determination of the change in length due to temperature changes. The specimens
shall be tested by measuring the lockclad length at 32 °F + 1 °F and raising the temperature to
80 °F + 1 °F while measuring the lockclad length at each 10 °F increment as a minimum. The
coefficient of thermal expansion shall be calculated from these data and all values shall fall
within the values specified in table II.
4.4.5 Proof loading. All lockclad control cable assemblies furnished under a contract
shall be proof loaded, by gripping the terminals at the two ends, as specified in MIL-DTL-5688.
4.4.6 Qualification test for temperature limits. Three specimens shall be manufactured
as specified in 4.3.2.1. The specimens shall be loaded in tension to 60 percent MBS and the
elongation determined while the temperature is -65 °F, +5°, -0° and again at 200 °F, +5°, -0°.
The elongation shall be within 20 percent of the elongation limits specified in table II.
4.4.7 Qualification test for weight. At least three sections of lockclad material not less
than 2 feet in length manufactured at the same time of the same materials and processes shall be
weighed. Weight shall not exceed the maximum weight specified in table I.
4.4.8 Concentricity. Three lockclad assemblies shall be sectioned approximately in the
middle of the lockclad. A 0.10 to 1-inch section may be removed. The section may be mounted.
The thickness of the clad shall be measured at four points on the diameter approximately 90°
apart. The thinner of the four points shall not be less than 90 percent of the thickness of the
thicker of the four points.
4.4.9 Straightness. The lockclad assembly manufacturer is responsible for assurance that
the straightness requirement specified in paragraph 3.3.2.5 is in compliance on all lockclad
control cable assemblies or lockclad material delivered under a contract. Methods and
frequencies of measurement shall be sufficient to assure this condition. Inspection may be
accomplished during the proof loading procedure.
4.5 Identification of product. All lockclad control cable assemblies and lockclad
material shall be inspected for appropriate marking prior to shipping. Marking shall comply with
3.5. Marking which does not comply shall be corrected and if not correctable within the
requirements of 3.5, the lot shall be rejected.
4.6 Certification. For each government order or contract, the wire rope manufacturer
shall certify that the product satisfactorily passed the quality conformance inspections of this
specification. The certification shall include, as a minimum, actual results of the tests specified
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