MIL-DTL-22931D
4.5.12 Cold bend (when applicable, see 3.5.2). Cables with jackets shall be tested in accordance with
4.5.12.1 or 4.5.12.2, as applicable.
4.5.12.1 Cables (1.625 inches (41.28 mm) nominal diameter or smaller). A section of finished cable,
whose length shall be sufficient to make one revolution around a mandrel with a diameter as specified
(see 3.1), shall be placed in a chamber and subjected to a temperature of -30ºC ± 2ºC for at least 12
hours. After this period, the cable shall be removed and immediately subjected to a 180º band around the
mandrel specified. The cable shall be examined for visual evidence of cracking and breaks in the jacket.
4.5.12.1 Cables (larger than 1.625 inches (41.28 mm) nominal diameter). A section of finished cable,
whose length shall be sufficient to make one-half revolution around a mandrel with a diameter as
specified (see 3.1), shall be placed in a chamber and subjected to a temperature of -30ºC ± 2ºC for at
least 12 hours. After this period, the cable shall be removed and immediately subjected at a 180º bend
around the mandrel specified. The cable shall be examined for evidence of cracking and breaks in the
jacket.
4.5.13 Bending (when applicable, see 3.5.3). Finished cables shall be tested in accordance with
4.5.13.1. When applicable, the alternate procedure, 4.5.13.2 may be used.
4.5.13.1 Procedure. The length of cable shall be sufficient to provide three complete coils around the
mandrel specified (see 3.1). One end of the test cable shall be clamped circumferentially at any two
points, approximately 45° apart, to the mandrel. The specimen shall then be coiled and uncoiled (the
mandrel shall be rotated a minimum of 720°) give times. Although no special tools shall be used during
the bending of the cable, a mechanism may be provided to guide the cable on the mandrel. The cable
shall then be coiled and uncoiled at a rate between 1 and 5 revolutions per minute (rpm). After the fifth
cycle, the sample shall be tested as specified in 4.5.10 and 4.5.12. VSWR may be measured on the
sample while coiled.
4.5.13.2 Alternate procedure (for use with cables larger than 1.625 inches (41.28 mm) nominal
diameter). The length of cable shall be sufficient to form 180º on the mandrel specified (see 3.1). The
test cable shall then be subjected to 10 reverse bends of 180º each on the mandrel. After the fifth cycle,
the sample shall be cut open and examined to verify that there is no kinking, wrinkling or cracking.
4.5.14 Temperature cycling (when applicable, see 3.5.4). Cables shall be tested in accordance with
4.5.14.1 or 4.5.14.2, as applicable.
4.5.14.1 Cables 1.625 inches (41.28 mm) nominal diameter and smaller). A length of cable with
connectors properly attached, sufficient to make one complete 360° turn, shall be coiled on a mandrel of
a diameter equal to the diameter specified (see 3.1). The mandrel with cable firmly attached shall be
placed in a chamber and subjected to the temperature cycling specified in table VIII. After the cycling has
been completed, the cable shall be tested as specified in 4.5.8 and 4.5.10.
4.5.14.2 Cables (larger than 1.625 inches (41.28 mm) nominal diameter). A length of cable with
connectors properly attached, sufficient to make one-half revolution around a mandrel with a diameter as
specified (see 3.1), shall be subjected to the temperature cycling specified in table VIII. After the cycling
has been completed, the cable shall be tested as specified in 4.5.8 and 4.5.10.
TABLE VIII. Temperature cycling.
-55ºC to +80ºC
-55ºC to +200ºC
Step
Time
(ºC)
(ºC)
(hours)
12
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