MIL-DTL-83420M
3.5 Performance.
3.5.1 Operating range. The wire rope shall be capable of operation in wind, dust, fuel,
oil spills, wash-down, and other aircraft environmental stresses and experiences at the
3.5.1.1 Type I. Type I wire rope shall be capable of operating within a -65 °F to +250 °F
(-54 °C to +121 °C) temperature range.
3.5.1.2 Type II. Type II wire shall be capable of operating within a -65 °F to +200 °F
(-54 °C to +94 °C) temperature range.
3.5.2 Wire flexibility.
3.5.2.1 Ductility of steel. Composition A or B wire shall not fracture when wrapped in
accordance with 4.4.1.1 prior to wire rope fabrication.
3.5.2.2 Adherence of coating. The tin or zinc coating shall not crack or flake when
wrapped in accordance with 4.4.1.2 prior to wire rope fabrication. Loosening or detachment of
small superficial particles of coating (formed by mechanical polishing of the surface) during the
adhesion test is acceptable.
3.5.3 Breaking strength. The type I, composition A and B, wire ropes shall have the
3.5.4 Endurance, type I wire rope. Each wire rope size of each construction shall be
capable of withstanding the respective tension loads, reversals, and breaking strength shown in
table III.
3.5.5 Endurance, type II wire rope. Each wire rope size of each construction shall be
capable of withstanding the respective tension loads, reversals, and breaking strength shown in
table IV. There shall be no cracking or deterioration of the nylon coating after the test.
3.5.6 Stretch limits. The stretch in each wire rope size of each construction shall not
exceed 1.5 percent when it is loaded to 60 percent of the MBS as shown in table I.
3.5.7 Test load. Each wire rope size of each construction shall carry 80 percent of its
respective MBS load, as shown in table I, without any failures of the individual wires in the rope.
3.5.8 Jacket characteristics, type II. The nylon jacketed wire rope shall have
characteristics in accordance with the requirements of table II.
3.5.9 Low temperature flexibility, type II. Each size of each type II jacketed rope shall
be bent or flexed at a temperature of -65 °F (-54 °C) without any deleterious effects such as
cracking of the nylon or separation from the wire rope.
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