MIL-DTL-641F
TABLE III. Group C inspection.
Inspection
Requirement
Test
paragraph
paragraph
Subgroup 1 (sample units 1-6)
Thermal shock - - - - - - - - - - - - - - - -
3.6.5
Vibration - - - - - - - - - - - - - - - - - - - -
3.6.7
Shock (specified pulse)- - - - - - - - - -
3.6.8
Moisture resistance - - - - - - - - - - - -
Subgroup 2 (sample units 7-10)
Spring life - - - - - - - - - - - - - - - - - - -
3.6.9
Water seal (when specified) - - - - - -
3.6.10
Salt spray (corrosion) - - - - - - - - - - -
Frame strength (when specified) - - -
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 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-C-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). Jacks shall be inspected to verify that
the materials, screw threads, physical dimensions, marking, and workmanship are in accordance with the
applicable requirements. Physical dimensions of tip and ring shall be measured while a mating plug is inserted in
the jack.
4.6.2 Contact resistance (see 3.6.1). Jacks shall be tested in accordance with method 307 of MIL-STD-202.
The following details shall apply:
a.
Method of connection Applicable mating plug (see table IV).
b.
Test current 100 ± 2 milliamperes direct current.
c.
Maximum open-circuit test voltage Approximately 6 volts.
Number of activations prior to measurement Six, using applicable mating plug (see table IV) or a
d.
dimensionally equivalent brass plug.
e. Number of test activations One.
f. Number of measurements per activation Measure between each jack terminal and the corresponding plug
terminal, at the point of normal connection, between all sets of local contacts which make upon insertion of
the plug, and between all sets of local contacts which are normally closed.
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