MIL-PRF-22710 Switches, Code Indicating Wheel \(Printed Circuit\), Thumbwheel And Push-Button, General Specification ForThis specification covers the general requirements for illuminated and non-illuminated, thumbwheel \(see 6.4.1\), and push-button, printed circuit rotary switches having unsealed and sealed modules and the associated hardware. These switches are designed for low power alternating current \(ac\) and direct current \(dc\) switching applications for use in electronic and communication equipment. Procurement of switches and mounting hardware will require additional data, giving detailed electrical and mechanical requirements, tolerances, and applicable additions and exceptions to the general requirements and tests specified herein \(see 6.2\).

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MIL-PRF-22710H

4.4.2.1.2 Subgroup 2. A sample of parts shall be randomly selected in accordance with table VIII, subgroup 2

sampling plan.

4.4.2.2 Rejected lots. If an inspection lot is rejected, the lot shall be 100 percent inspected for the defects noted.

The contractor may correct all of the defects or remove all of the defective units from the lot. The lot shall then be

sampled again in accordance with table VII and table VIII. For acceptance, there shall be zero occurrences of

defects. Such lots shall be separate from new lots and shall be clearly identified as reinspected lots. If there are one

or more defects in this second sample for the same characteristic that caused the original lot rejection, the lot is

rejected.

4.4.3 Group B inspection. Group B inspection shall consist of the inspections specified in table IX, in the order

shown, and the sample shall be selected from inspection lots that have passed group A inspection.

4.4.3.1 Sampling plan. Samples shall be randomly selected in accordance with table VIII, subgroup 1 sampling

plan. The sample size shall be based on the inspection lot size from which the sample was selected for group A

inspection. For acceptance of the lot there shall be zero occurrences of defects.

4.4.3.2 Rejected lots. If an inspection lot is rejected, the lot shall be 100 percent inspected for the defects noted.

The contractor may correct all of the defects or remove all of the defective units from the lot. The lot shall then be

sampled again in accordance with table IX. For acceptance, there shall be zero occurrences of defects. Such lots

shall be separate from new lots and shall be clearly identified as reinspected lots. If there are one or more defects in

this second sample for the same characteristic that caused the original lot rejection, the lot is rejected.

4.4.3.3 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.

4.4.4 Periodic inspection. Periodic inspection shall consist of group C. Except where the results of these

inspections show noncompliance with the applicable requirements (see 4.4.4.1.4), delivery of products which have

passed group A and group B inspections shall not be delayed pending the results of these periodic inspections.

4.4.4.1 Group C inspection. Group C inspection shall consist of the inspections specified in table X, in the order

shown, for each subgroup. Group C inspection shall be made on sample units selected from inspection lots which

have passed the group B inspection, unless the Government considers it more practical to select a sample from

current production for group C inspection.

4.4.4.1.1 Sampling plan. Sixteen sample units for each style shall be subdivided and tested as specified for each

subgroup in table X. Group C inspections shall be completed in accordance with table X within 36 months after the

date of notification of qualification and within each subsequent 36 month period. When production of a particular

style of switch has been suspended for 36 months, the qualifying activity shall be notified. During each inspection

period, if more than one style has been produced covering a number of performance levels, and if inspection is

performed on sample units with the highest performance level produced during that period, then group C inspection

can be omitted for the styles with lower performance levels.

4.4.4.1.1.1 Group C suspension. At the request of the manufacturer, group C testing may be suspended with the

qualifying activity's approval if it can be demonstrated that these test have been performed three consecutive times

with zero failures. If the design, material, construction, or processing is changed or if there are any quality problems

or failures, or at their discretion the qualifying activity may require resumption of the original testing requirement.

Suspension of testing does not relieve the manufacturer from meeting the Group C test requirements.

4.4.4.1.2 Failures. If one or more sample units fail to pass group C inspection, the sample shall be considered to

have failed.

4.4.4.1.3 Disposition of sample units. Sample units which have been subjected to group C inspections shall not be

delivered on the contract but shall be submitted to the qualifying activity.