MIL-DTL-55040E
3.3.2 Life cycle. The cable shall have a life cycle of 5000 cycles when extended to 4 times its
retracted length at a rate not less than 18 cycles per minute (cpm) and shall be capable of returning to
within 20% of its original retracted length within one hour after completion of the cycling. The change in
resistance of the conductor at any time during the life cycle of the cable shall not exceed 10% of its
original resistance.
3.3.3 Extended length. The finished cable shall have a minimum extended length of 2.5 times its
retracted length under a load of 6 ounces.
3.3.4 Set. After being extended horizontally to 5 times its retracted length and immediately released,
the cable shall return to within 20% of its original length within 5 minutes.
3.3.5 Static load. The cable, extended vertically to a length 2.5 times its retracted length for a period
of 48 hours, shall return to not more than 115% of its original retracted length within 30 minutes after
release from restraint.
3.3.6 Retraction at low temperature. The cable shall be capable of being extended to 4 times its
retracted length without fracture of the conductor, conductor insulation, or jacket when subjected to the
test specified in 4.8.3.6. When released from its extended position, the cable shall retract to not more
than 250% of its retracted length within 30 seconds.
3.3.7 Voltage withstand. The electrical cable shall not show any signs of dielectric breakdown when
subjected to the tests in 4.8.3.7.
3.3.8 Insulation resistance. The minimum value for insulation resistance shall be 1000 megohms
when the cable is subjected to the test in 4.8.3.8.
3.4 Workmanship. The cable shall be free of kinks, abrasions, and cracked or peeled surfaces. The
cable shall be a uniform and consistent product and shall be free from defects, dirt or foreign substances
that adversely affect the serviceability of the product.
3.5 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible, provided that the
material meets or exceeds the operational and maintenance requirements, and promotes economically
advantageous life-cycle costs.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as
follows:
a. Conformance inspection (see 4.2).
b. Individual inspection (see 4.5).
c. Sampling inspection (see 4.6).
d. Periodic inspection (see 4.7).
4.2 Conformance inspection. Conformance inspection shall consist of the inspections listed in table
II. Unless otherwise specified, conformance inspection shall be performed on every lot of cable produced
under this specification (see 6.2).
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