MIL-DTL-287J
4.7.6 Cold-bending. Unless otherwise specified, the assembly shall be placed in an oven at a temperature of
100° ± 2° C, (see 3.1 and 3.5.5), for a period of 7 days. At the end of this period, the assembly shall be cooled to
room temperature (approximately 20°C) for a period of 2 hours. Unless otherwise specified (see 3.1), the assembly
shall then be placed in a cold chamber at a temperature of -55° ± 5° C for a period of 20 hours. The assembly shall
then be bent three times as specified in 4.7.15 at a rate not to exceed 5 degrees per second, first in one direction and
then in the other, at the temperature of the chamber. The assembly shall then be moved from the chamber and
examined for checks, cracks, fractures, or other flaws in the jacket or metal structure, as applicable. The assembly
shall then be subjected to the pressurization test specified in 4.7.5 as a means of determining the mechanical
uniformity of the assembly after it has been brought back to room temperature.
4.7.7 Vibration, high frequency. Assemblies shall be tested in accordance with MIL-STD-202, method 204 (see
3.5.6). The following details shall apply:
a. Mounting: Unless otherwise specified (see 3.1), rigidly mounted by flanges only to an appropriate non-
resonant mounting table.
b. Electrical load: Not applicable.
c. Test condition letter: A.
d. Resonance: Not applicable.
e. Measurements after vibration: Insertion loss and VSWR shall be measured as specified in 4.7.2 and
4.7.4, respectively.
4.7.8 Retention. Both flanges of the assembly shall be subjected to the retention test (see 3.5.7). The flange
under test shall be secured to a stationary plate and the specified force (see 3.1) shall be applied in a straight line
pull between the flange under test and the remaining flange. Spring scales or other appropriate means of
measuring mechanical force shall be used to measure the applied force. Force measurement instruments shall be
accurate within 0.5 lbf. The force shall be gradually applied, held for 10 seconds, and released. The cycle shall be
repeated four additional times. Following the test, pressurization and VSWR shall be measured as specified in 4.7.5
and in 4.7.4, respectively.
4.7.9 Shock . Assemblies shall be tested in accordance with MIL-STD-202, method 213 (see 3.5.8). The
following details shall apply:
a. Mounting: Unless otherwise specified (see 3.1), rigidly mounted by flanges only to test platform.
b. Test condition letter: G.
c. Measurements after shock: Insertion loss and VSWR shall be measured as specified in 4.7.2 and in
4.7.4, respectively.
4.7.10 Salt Atmosphere (Corrosion). Assemblies shall be tested in accordance with MIL-STD-202, method 101
(see 3.5.9). The waveguide ends should be capped prior to this test. The following details shall apply:
a. Special mounting: Not applicable.
b. Test condition letter: B.
c. Measurements after exposure: Insertion loss, stability of insertion loss, and VSWR shall be measured
as specified in 4.7.2, 4.7.3, and 4.7.4, respectively. The assembly shall be visually examined for evidence
of destructive corrosion.
4.7.11 Moisture resistance. Assemblies shall be tested in accordance with MIL-STD-202, method 106 (see
3.5.10). The following details shall apply:
a. Initial measurement: Not applicable.
b. Polarization voltage: Not applicable.
c. Loading voltage: Not applicable.
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