MIL-HDBK-780D
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4.2.5.3 Responsibility for compliance. All items must meet all requirements of sections 3 and 5 of the SMD. The inspection set forth in the SMD should become part of the contractor's overall inspection system or quality program. The absence of any inspection requirements in the SMD does not relieve the contractor of the responsibility of assuring that all products or supplies submitted to the Government for acceptance comply with all requirements of the contract. Sampling in conformance inspection does not authorize submission of known defective material, either indicated or actual, nor does it commit the Government to acceptance of defective material.
4.2.5.4 Conformance inspection. The tests listed in section 4 of the SMD to determine conformance with sections
3 and 5 requirements, should include, when necessary, a measurement or comparison with specified characteristics and checks and tests of the performance and reliability requirements. Each item must meet all sections 3 and 5 requirements. The test methods in section 4 of the SMD are minimum inspection and test methods to be used to document compliance to the SMD requirement.
4.2.5.4.1 Conformance inspection sampling. When it is desirable to specify the sampling procedure to be used by contractors for the performance of conformance inspection, the sampling procedure should:
a. Impose no inspection procedures that are less efficient and effective than would normally be used by the industry.
b. Clearly identify the sampling plan to be used in the manufacturing process when inspections are to be performed at intermediate points, as well as, on the end item.
c. Be capable of assuring compliance with requirements under various conditions of manufacturing or purchasing, e.g., mass or job lot production and large or small lot purchasing.
When inspections are to be based on lots of material, a definition of a lot size(s) should be furnished in this section by reference, if applicable. Restrictions concerning the formation of inspection lots such as restricting inspection lots of units of the same type, class, size, should be specified. Restriction of units forming the lot of those produced from the same assembly line, etc., should also be specified, when applicable.
4.2.5.5 Classification of conformance inspections. Conformance inspections should be classified into group A, B, C, D or E in accordance with the following groupings, when applicable:
Group A - Nondestructive inspections of all items produced or all samples from an inspection lot demonstrate product compliance with contractual requirements. Group A inspection examines characteristics most affected by variations in production processes or skills, and functions vital to successful completion of the design mission.
Group B - Generally nondestructive inspections that are more complex or of a longer duration than group A inspection. Group B inspection examines characteristics more affected by part or equipment quality and less affected by variations in production processes or skills, and functions requiring special fixtures or environments. Fewer samples are inspected than for group A inspections and test articles may be offered for acceptance with little or no refurbishment. Each commodity should be individually evaluated regarding its issue after performing group B and C inspections.
Group C - Periodic and generally destructive tests of characteristics depending upon product design and materials. Group C inspection consists of more complex tests, usually including emulated service environments, is generally destructive and may require major refurbishment before tested articles can be used by the services. Tests are based on production quantities or time period.
Group D - Destructive test or test of long duration that consumes all or a considerable portion of design service life. Articles subjected to group D inspection should not be issued. Tests are performed on few samples based on production quantities or time period.
* Group E - Radiation hardness assurance testing performed, generally as an option, to determine the levels of susceptibility for damages that would come from exposure to various doses of radiation. The testing is most
commonly performed following burn-in.
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