MIL-DTL-13735G
4.7 Periodic Inspection. Periodic inspection shall consist of group B in accordance with table IV. Except where the
results of these inspections show noncompliance with the applicable requirements delivery of products which have
passed group A shall not be delayed pending the results of these periodic inspections.
4.7.1 Failures. If one or more sample units fail to pass group B inspection, the sample shall be considered to have
failed.
4.7.2 Disposition of sample units. Sample units which have been subjected to group B inspection shall not be
delivered on the contract or order but shall be kept on hand until the next inspection period for submittal to the
qualifying activity if so requested.
4.7.3 Noncompliance. If a sample fails to pass group B inspection, the contractor 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, and so forth, and which are considered subject to
the same failure. Acceptance of the product shall be discontinued until corrective action, acceptable to the
Government, has been taken. After the corrective action has been taken, group B inspection shall be repeated on
additional sample units (complete inspection, or the inspection which the original sample failed, at the option of the
Government.) Group A inspection may be reinstituted; however, final acceptance shall be withheld until the group B
reinspection has shown that the corrective action was successful. In the event of failure after reinspection,
information concerning the failure and the corrective action taken shall be furnished to the contracting officer and the
qualifying activity.
4.8 Methods of inspection.
4.8.1 Materials and construction. Conformance to 3.2 through 3.3.4 shall be determined by inspection of
contractor records providing proof or certification that design, construction, processing, and materials conform to
requirements. Applicable records shall include drawings, specifications, design data, receiving inspection records,
processing and quality control standards, vendor catalogs and certifications, industry standards, test reports, and
rating data.
4.8.2 Defects. Conformance to 3.3 through 3.3.4, 3.6, and 3.7 shall be visual or by measurement with standard
inspection equipment.
4.8.3 Contact voltage drop. To determine conformance to 3.4.1.1, one terminal of type I or type II switch (if type II,
the terminal shall be the common terminal) and two or more terminals of type III and type IV switch (if type IV, the
terminal shall be the common terminal) shall be connected to an energy source. All terminals which are normally
connected to a load in intended operation shall be connected to the rated resistive load specified on the applicable
MS standard or drawing. With the lever in each closed position, the voltage drop(s) between the appropriate
terminals shall be measured. If the switch has no leads, the contact voltage drop(s) shall be considered to be the
measured voltage drop(s). If the switch has leads, the contact voltage drop(s) shall be determined by subtracting the
voltage drop(s) due to the leads from the measured voltage drop(s).
4.8.4 Overload. To determine conformance to 3.4.1.2, switch shall be subjected to 100 cycles, as defined in 4.2,
while being connected to an energy source and to a resistive load current 150 percent of the rated resistive load
current specified on the applicable MS standard or drawing. The circuit shall be that specified in 4.8 3.
4.8.5 High voltage. To determine conformance to 3.4.1.3, with the switch open, 440 V rms at 60 Hz shall be
applied for 1 minute to the switch between appropriate terminals, with the lever in each open position.
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