MIL-PRF-31031B
4.5.2.1.1 Sampling plan. Fourteen sample units of the same PIN shall be selected from the first lot
produced after the date of notification of qualification. Thereafter, fourteen sample units of the same PIN
shall be selected from current production after 200,000 connectors have been produced, or not less than
once every 3 years, whichever occurs first. The sample units shall be divided equally and subjected to
the inspections of the seven subgroups.
4.5.2.1.2 Failures. If one or more sample units fail to pass group C inspection, the sample lot shall be
considered to have failed.
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 or order.
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 are manufactured under essentially the same materials and processes, and which are considered
subjected 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 tests and examinations, or the
test which the original sample failed, at the option of the qualifying activity). Groups A and B inspections
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.
4.6 Methods of inspection. The following identified tests and test methods assure connector integrity
within typical operating conditions and applications. Alternate commercial industry standard test methods
are allowed; however when an alternate method is used, the qualifying activity must be notified prior to
the performance of the test. The methods described herein are proven methods and shall be the referee
method in case of dispute.
4.6.1 Visual and mechanical inspection. Connectors and associated fittings shall be examined to verify
that the design, construction, physical dimensions, assembly instructions, marking and workmanship are
4.6.1.1 Dimensional inspection. Mating dimensions shall be inspected by mating the connector with its
applicable mating gauges or other suitable means acceptable to the Government.
4.6.2 Force to engage/disengage.
4.6.2.1 Bayonet and threaded types (see 3.5.1). The connector shall be engaged with its mating
standard part (see 3.1). During the entire coupling/uncoupling cycle (until the connector is fully
engaged/disengaged), the forces and/or torques necessary shall not exceed those specified (see 3.1). A
thread coupled connector is fully engaged with its mating standard part when their reference planes (see
3.1) coincide. A bayonet coupled connector is fully engaged with its mating standard part when the
bayonet studs have passed the detent and their reference planes coincide. No additional tightening
torque shall be applied. The mating standard part is a steel jig, containing the critical interface
dimensions finished to the tolerances specified (see 3.1), or a qualified mating connector with the
approval of the qualifying activity. Its spring members, when applicable, shall be heat treated beryllium
copper. The surface finish of mating surfaces shall be 16 microinches maximum, in accordance with
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