MIL-DTL-287J
FIGURE 3. Flexure test figure.
4.7.16 Axial twist (applicable only to twistable type). One flange of the assembly shall be securely fastened to a
stationary platform. To prevent the assembly from bending, a rigid shaft that extends through the long axis of the
waveguide as an axis of rotation shall be mounted to the platform. The other flange shall be connected to this shaft
and shall be free to rotate about it. Uniform alternating clockwise and counterclockwise twisting shall be applied to
the assembly about the axis. The assembly shall be subjected to five complete cycles of clockwise and
counterclockwise twist from the relaxed position to the angle appropriate for the length under test (see 3.1).
Twisting shall be performed uniformly at a rate of approximately 1 cycle per 10 seconds. At the end of the test
cycle, the assembly shall be under neither tension nor compression. The stability of insertion loss and VSWR shall
4.7.17 Repeated twist (applicable only to twistable type one-way twisting). Repeated twist test shall be
performed as specified in 4.7.16, except the number of cycles shall be as specified (see 3.1). For assemblies that
operate up to 12.4 GHz inclusive, a 24 inch (610 mm) (nominal) long representative sample of the same size and
type as the assembly under test may be used for the repeated twist test. For assemblies that operate above 12.4
GHz and through 26.5 GHz, a 12 inch (305 mm) (nominal) long representative sample of the sample size and type
as the assembly under test may be used for the repeated twist test. For assemblies that operate above 26.5 GHz, a
2 inch (51 mm) (nominal) long representative sample of the same size and type as the assembly under test may be
used for the repeated twist test. The stability of insertion loss and the VSWR shall then be measured as specified in
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's 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.
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