MIL-DTL-55074G
4.7.2.3 Preparation of samples for immersion and air leakage tests. The connectors and contact
assembly shall be prepared for the tests listed in immersion 4.7.8 and air leakage 4.7.7 in the following
manner:
a. Connector U-185( )/G. The cable entrance of each connector shall be
sealed using a plug having a diameter of 0.625 maximum.
b. Connector U-186( )/G. The cable entrance of each connector shall be
sealed using a plug having a diameter sufficient to seal.
c. Connector U-187( )/G. The connector shall be mounted to a flat metal
plate, not less than 1/8 inch thick, using the sealing gasket and the
six mounting screws.
d. Contact assembly MX-3227 ( ) /G. The contact assembly shall be mounted in
connector housing U-185( G, U-186( )/G, or U-187( )/G and prepared as
indicated in a., b., or c. above.
NOTE: When air leakage tests are being performed, air may be applied through the plug or the metal
plate.
4.7.2.4 Preparation of samples for tests (excluding immersion and air leakage tests). The connectors
assembled with minimum of 10 feet of Cable WM-130()/G, shall be prepared for the tests listed in 4.7.13
pull, 4.7.16 temperature cycling, 4.7.17 ninety degree bend, 4.7.19 moisture resistance, and 4.7.20 high
humidity and high temperature.
4.7.3 Continuity (contact assembly) (see 3.5). The wiring between each male contact and its
corresponding female contact shall be tested electrically by automatic means (see 4.7.2.1) to determine
compliance with the requirement specified in 3.5.
4.7.4 Dielectric strength (contact assembly) (see 3.6). The contact assembly shall be tested by automatic
means (see 4.7.2.1). The 1,000 volts supplied by the tester shall be applied instantaneously and the
sequence of test shall be as fast as the tester will permit. The contact assembly shall meet the
requirement of 3.6.
4.7.5 Insulation resistance (contact assembly) (see 3.7). The contact assembly shall be tested by
automatic means (see 4.7.2.1). The test will be performed with a voltage of 1,000 volts as supplied by the
tester, except that during the moisture resistance test 4.7.19 and high humidity and high temperature test
4.7.6 Contact resistance (contact assembly) (see 3.8). The electrical resistance of each circuit in a pair of
mated contact assemblies shall meet the requirements of 3.8, when measuring the voltage drop across
the circuit carrying a 3 ampere dc current. The circuit consists of 2 pair of mated contacts and 2 jumper
wires. The contact assemblies shall be engaged leaving a clearance between the insulator blocks of
0.015 +.003 -.000 inch.
4.7.7 Air leakage (contact assembly and connector) (see 3.9). The contact assembly and connector
prepared in accordance with 4.7.2.3 shall be submerged in water not deeper than 6 inches. Air at 15 psi
shall then be applied internally to the equipment. After stabilization, the connector shall be observed for a
minimum of 30 seconds and meet the requirements of 3.9. This test shall then be repeated using air at
2.5 psi.
4.7.8 Immersion (contact assembly and connector) (see 3.10). The contact assembly and connector
prepared in accordance with 4.7.2.3 shall be immersed to a depth of 3 feet of water for 16 hours to
determine compliance with the requirements of 3.10. Fifty percent shall be mated, twenty-five percent
shall be with protective cover in place and the remainder shall be without protective cover.
4.7.9 Interchangeability (contact assembly and connector) (see 3.11). The connector shall be gaged
using the appropriate gages listed below, to determine conformance to the physical and functional
15
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business