MIL-DTL-642E
TABLE III. Group C inspection.
Inspection
Requirement
Test
paragraph
paragraph
Subgroup 1 (sample units 1-6)
Moisture resistance - - - - - - - - - - - - 3.6.5
Torque (when applicable)- - - - - - - - - 3.6.1
Subgroup 2 (sample units 7-12)
Thermal shock - - - - - - - - - - - - - - -
Vibration - - - - - - - - - - - - - - - - - - -
Shock (specified pulse)- - - - - - - - - -
Torque (when applicable)- - - - - - - - -
Salt spray (corrosion) - - - - - - - - - - -
4.5.2.1.3 Disposition of sample units. Sample units which have been subjected to group C inspection shall
not be delivered on the contract.
4.5.2.1.4 Noncompliance. If a sample fails to pass group C inspection, the manufacturer shall notify the
qualifying activity and the cognizant inspection activity of such failure and take corrective action on the
materials or processes, or both, as warranted, and on all units of product which can be corrected and
which were manufactured under essentially the same conditions, with essentially the same materials,
processes, etc, and which are considered subject to the same failure. Acceptance and shipment of the
product shall be discontinued until corrective action, acceptable to the qualifying activity has been taken.
After the corrective action has been taken, group C inspection shall be repeated on additional sample
units (all inspection, or the inspection which the original sample failed, at the option of the qualifying
activity). Groups A and B inspection may be reinstituted; however, final acceptance and shipment shall be
withheld until the group C inspection has shown that the corrective action was successful. In the event of
failure after reinspection, information concerning the failure shall be furnished to the cognizant inspection
activity and the qualifying activity.
4.5.3 Inspection of packaging. Sample packages and packs and the inspection of the preservation
packing and marking for shipment and storage shall be in accordance with the requirements of
MIL-DTL-55330.
4.6 Methods of inspection.
4.6.1 Visual and mechanical inspection (see 3.1, 3.4, 3.5, 3.7, and 3.8). Plugs shall be inspected to verify
that the materials, screw threads, physical dimensions, marking, and workmanship are in accordance with
the applicable requirements.
4.6.2 Torque (unless otherwise specified (see 3.1 and 3.6.1). With the sleeve of the plug held rigid, a
twisting force of 2 pound-inches shall be applied for at least one minute to the tip of the plug assembly in
a direction intended to loosen the tip of the plug. On three-element plugs having a dead collar between
the tip and the ring, a twisting force of 1 ½ pound-inches shall also be applied to the dead collar, in a
direction intended to loosen it from the assembly.
4.6.3 Dielectric withstanding voltage (see 3.6.2). Plugs shall be tested in accordance with method 301 of
MIL- STD-202. The following details shall apply:
a. Magnitude of test voltage and nature of potential 500 volts ac.
b. Duration of application For qualification inspection, the test voltage shall be applied at a rate
of 100 volts per second. For quality conformance inspection, the voltage may be applied
instantaneously and shall be maintained for at least 5 seconds.
c. Points of application Between mutually insulated terminals of the plug.
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