MIL-DTL-83526C
4.9.15 Twist. Mated cable-connector assemblies shall be tested in accordance with TIA-455-36.
Connector-held fixture shall be rotated ± 90 degrees at a rate of one cycle per five seconds for a total of
1,000 cycles. The cable assemblies shall be stretched with a minimum tension of 11.0 pounds to their
maximum lengths and clamped at a distance of about 10 times the cable diameter from the connector to
the fixture tabletop. The fixturing and cable clamping are to be done in a manner that does not affect the
cable's optical transmittance beyond acceptable limits as specified (see 3.11.15). Measurements shall be
taken before and after testing.
4.9.16 Cable seal flexing (see 3.11.16). Unmated cable-connector assemblies, of each type to be
qualified shall be tested in accordance with test procedure I, of TIA/EIA-455-1.
4.9.17 Cable retention. Mated connector samples shall be tested in accordance with TIA-455-6. The
axial tensile load shall be applied up to the load specified (see 3.11.17) and shall be maintained for 10
minutes. Elongation of the cable shall have no effect on the insertion loss while the load is applied for the
specified time. Tests and measurements before, during, and after test shall be taken as required by the
detail specification.
4.9.18 Crush resistance (see 3.11.18). Cable connector assemblies shall be tested in accordance with
TIA-455-26. The test load shall be 450 pounds and shall be applied a total of four times, rotating the
sample 90º about its axis after each loading. The load shall be applied for a period of 5 to 10 seconds.
4.9.19 External bending moment (see 3.11.19). The wall or jam-nut mounted connector shall be
mounted as in normal service to a rigid panel. Before mating the cable connector to the wall or jam-nut
mounted connector, an adapter or test torque arm shall be attached as shown on figure 1. After mating
the two connectors, the distance "L" from the point of load application "P" to the mounting panel shall be
determined. The load to be applied at point "P" shall then be determined as the bending moment
specified divided by the lever arm "L". This load shall be applied at a rate of approximately 49.5 newtons
per second until the required load of 71 newton meters is achieved. The applied load shall be held for
one minute, and then the load shall be released. Insertion loss of the termini shall be monitored during
the test.
4.9.20 Temperature life. Mated connectors shall be tested in accordance with TIA/EIA-455-4 for 250
hours at 85ºC ± 2ºC. The change in insertion loss shall be measured during and after the test (3.11.20).
4.9.21 Thermal shock. Cable-connector assemblies (at least one mated and one unmated) shall be
tested in accordance with TIA/EIA-455-71, schedule C for five cycles. The fiber shall be in accordance
with MIL-PRF-49291. The number of fibers shall be given by the specification sheet (see 3.1). The
mated and unmated cable-connector assemblies shall be examined for degradations of any sort after
testing. The following conditions shall apply:
a. High test temperature: +85ºC.
b. Examination during test: Verify that the optical performance is within the limits specified in
c. Examination after test: Examine for compliance to 3.11.21.
4.9.22 Physical shock. Mated cable-connector assemblies shall be tested in accordance with test
condition C of TIA-455-14 applying 5 shocks per axis (30 total shocks). The cable shall be clamped to
the shock table approximately 8 inches from the rear of the connector. The change in insertion loss shall
be measured after the shock test (see 3.11.22).
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