MIL-DTL-55074G
interchangeability requirement of 3.11. When a mechanical or electrical value is not within specified or
design limits, it shall be considered a major defect.
4.7.10 Durability (contact assembly and connector) (see 3.12). The connector shall be tested for
compliance with 4.7.6 contact resistance, measurements shall be recorded. The connectors shall then be
subjected to 400 cycles of mating and unmating. A cycle shall consist of mating, locking and unlocking of
the cams and a complete separation of the connectors. When connector U-186( )/G or U-187( )/G is
being procured the test shall be performed using a contractor furnished connector U-185( )/G as the
mating connector, contact assembly MX-3227( )/G used within the U-185( )/G housing shall be from the
lot submitted for inspection. Connectors U-186( )/G and U-187( )/G shall be firmly mounted by the
mounting screws during the test. The connector shall meet the requirements of 3.12.
4.7.11 Mating of covers (cover) (see 3.13). Covers shall be firmly mated with each other 200 times. The
covers shall then meet the requirements of 3.13.
4.7.12 Contact durability (contact assembly) (see 3.14). Contact assemblies shall be subjected to 400
cycles of mating and unmating to determine compliance with the requirements of 3.14. There shall be no
readjustment of contacts. Mating and unmating may be accomplished mechanically without housings.
Clearance of .015 +.003 -.000 shall be provided between the contact assemblies to simulate mated
condition when in the housings.
NOTE: This test may be conducted concurrently with 4.7.10.
4.7.13 Pull (connector) (see 3.15). The connector U-185( )/G (see MIL-DTL-55074/1 prepared in
accordance with 4.7.2.4 shall be subjected to a 800 pound static load for 16 hours followed by twenty-five
200 pound pulls and relaxations. A minimum of 3 feet of cable connected to each connector shall be
subjected to the load. The assembly shall meet the requirements of 3.15.
4.7.14 Shock drop.
4.7.14.1 Shock drop (connector) (see 3.16.1). The connector (including a contact assembly) shall be
dropped a distance of 36 inches on each edge and face for a total of 12 drops. Six drops shall be made
with the protective cover on, the remaining 6 drops shall be made with the cover off. In addition, a pair of
mated connectors shall be dropped a distance of 36 inches on each side for a total of 12 drops. The
floor or barrier receiving the impact shall be 2 inch fir backed by concrete or a rigid steel frame.
Connectors (including contact assembly) shall meet the requirements of 3.16.1.
4.7.14.2 Shock drop (contact assembly) (see 3.16.2). Contact assembly MX-3227( )/G
mounted in a connector housing and held in place by the mounting studs shall be dropped
as outlined in 4.7.14.1 above. Contact assemblies shall meet the requirements of
4.7.15 Vibration test.
4.7.15.1 Vibration test (mated connector) (see 3.17.1). Connector U-185( )/G, U-186( )/G or U-187( )/G
(all including a contact assembly) shall be mounted securely to a plate on the vibration table. A second
connector shall be mated to it. The mated connectors shall then be subjected to a simple harmonic
motion having an amplitude of 0.03 inch (0.06 inch maximum total excursion). The frequency may be
varied uniformly between the approximate limits of 10 and 55 hertz. The entire frequency range, from 10
to 55 hertz and return to 10 hertz shall be traversed in approximately 1 minute. The motion shall be
applied for a period of 30 minutes in each of 3 mutually perpendicular directions (total of 90 minutes). The
connectors shall meet the requirements of 3.17.1.
4.7.15.2 Vibration test (contact assembly (see 3.17.2). Each contact assembly MX-3227( )/G shall be
mounted in connector housing and held in place by the mounting studs. One shall be secured to a plate
on a vibration table and the other mated to it. The vibration motion, direction and duration shall be as in
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