MIL-DTL-28751A
4.4.1.1 Calibration. The zero position on the graph and an indication of which side of zero is over and
which side is under the nominal cable diameters shall be required, and an indication of specific values in
thousandths of an inch shall be made on the recording with regard to the dielectric and outer jacket
outside diameters.
4.4.2 Shear strength. A suitable device such as Kellems grip shall be used to facilitate measurement
of the shear strength between strength members and jacket.
4.4.3 Specific gravity (see 3.3.1). The specific gravity shall be measured under a hydrostatic
pressure of 600 pounds per square inch (4.14 MPa) gage (psig) at room temperature (21șC to 23șC) in
fresh water. The measurement shall be made after a continuous immersion of two hours, minimum. The
cable sample shall not be removed from the pressure tank nor the pressure reduced until after the
measurement is completed. An approved test method is contained in USNUSL Technical memorandum
No. 220-74-62.
4.4.4 Cold bend (see 3.3.2). The cable shall be subjected to the cold bend test specified in MIL-C-17.
4.4.5 Crack resistance (see 3.3.3). The cable shall be tightly wrapped around a mandrel 3 inches in
diameter continuously for 24 hours to determine conformance.
4.4.6 Jacket bonding (see 3.4.4.1). A knife cut .0635 of an inch (1.587 mm) deep shall be made
across one side of the cable. The cable shall be bent back on itself with the cut on the outside of the
bend. There shall be no indication of separation of the inner and outer jacket.
4.4.7 Breaking strength (see 3.5.1). The breaking strength of the cable shall be determined by means
of a power-driven tensile machine. The rate of travel of the power actuated grip shall be adjusted to
move at a rate of 12 ± 2 feet (3.6 m ±.6 m) per minute. Distance between grips shall be five (5) feet (1.5
m) prior to the application of the load. A reduction of the jacket diameter to .580 inch (14.73 mm) shall be
considered a failure.
4.5 Inspection conditions. Unless otherwise specified herein, all inspection shall be made at room
ambient temperature, pressure and humidity.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in- house
contractor personnel, these personnel need to contact the responsible packaging activity to ascertain
packaging requirements. Packaging requirements are maintained by the Inventory Control Point's
packaging activities within the Military Service or Defense Agency, or within the Military Service System
Commands. Packaging data retrieval is available from the managing Military Department's or Defense
Agency's automated packaging files, CD-ROM products, or by contacting the responsible packaging
activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not
mandatory.)
6.1 Intended use. This cable is used in Naval submarines as a buoyant antenna device.
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