MIL-STD-1916
e. Identification and definition of the interrelations of all departments (e.g., production, engineering, purchasing, marketing, administration, etc.) involved in SPC and quality improvement, their responsibilities, and the use of teams.
f. When applying control charts, the reasoning behind establishing rational subgroups and sampling frequency; the procedures for determining and updating control limits; and the criteria for determining out-of-control conditions.
g. Identification of key parameters used in lieu of one or more specified characteristics, verification of the correlation of such parameters to those characteristics, and description of the manufacturing process steps responsible for these parameters.
h. Identification of personnel responsible for process-related corrective action.
i. Proper gage measurement studies showing measurement variations relative to the total variation.
J. Traceability of the product and process corrective action(s) taken when the process went out of statistical control, showing how the root cause was identified and eliminated.
5.1.4.3 Examples of evidence regarding product conformance.
a. Control charts showing the process in statistical control in accordance with the criteria asked for in paragraph 5.1.4.2.f.
b. Records of product and process corrective action(s) taken when nonconformances occur.
c. Process capability studies consisting of the correct calculation and interpretation of indices, such as Cp and Cpk.
d. History of product inspection results reinforced by statistical data and analysis.
e. Results from in-process control methods, such as 100 percent automated assembly and/or inspection.
5.2 Acceptance by tables.
5.2.1 Sampling inspection. When acceptance is to be accomplished using the sampling tables provided in this document, the following considerations apply.
5.2.1.1 Verification level specification. The VL's are specified in the contract or product specifications. A VL may be specified for individual characteristics, for a group of characteristics, or for subgroups of characteristics within the group. The VL and code letter
(CL) from Table I determine the sampling plan required to assess product compliance to contract and specification requirements. Contractors are expected to produce and submit product in full conformance to all requirements. Lots, batches, or production intervals of product that consistently meet or exceed all requirements will be accepted by the sampling plans of this standard and will result in qualifying for reduced sampling levels.
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