Written Procedures8212;Written procedures are ordinarily developed and made available for the customer’s review, upon request. When the written procedures indicate use of this standard, they shall comply with the requirements of this practiceand reference appropriate parts as necessary.
Nonconformance8212;The extent of nonconformance of product shall be expressed either in terms of percent defective or in terms of defects per hundred units.
Formation and Identification of Lots or Batches8212;The product shall be assembled into identifiable lots, sublots, batches, or in such other manner as may be prescribed. Each lot or batch shall, as far as is practicable, consist of units of product of a single type, grade, class, size, and composition, manufactured under essentially the same conditions, and at essentially the same time. The lots or batches shall be identified by the contractor and shall be kept intact in adequate and suitable storage space.
AQL:
AQL Use8212;The AQL, together with the Sample Size Code Letter, is used for indexing the sampling plans provided herein.
Limitation8212;The selection or use of an AQL shall not imply that the contractor has the right to supply any defective unit of product.
Choosing AQLs8212;Different AQLs may be chosen for groups of defects considered collectively, or for individual defects. An AQL for a group of defects may be chosen in addition to AQLs for individual defects, or subgroups, within that group. AQL values of 10.0 or less may be expressed either in percent defective or in defects per hundred units; those over 10.0 shall be expressed in defects per hundred units only.
Sampling:
Representative (Stratified) Sampling8212;When appropriate, the number of units in the sample shall be selected in proportion to the size of sublots or sub-batches, or parts of the lot or batch, identified by some rational criterion. When representative sampling is used, the units from each sublot, sub-batch or part of the lot or batch shall be selected at random.
Time of Sampling8212;A sample may be drawn after all the units comprising the lot or batch have been assembled, or sample units may be drawn during assembly of the lot or batch, in which case the size of the lot or batch will be determined before any sample units are drawn. If the sample units are drawn during assembly of the lot or batch, and if the rejection number is reached before the lot is completed, that portion of the lot already completed shall be rejected. The cause of the defective product shall be determined and corrective action taken, after which a new lot or batch shall be begun.
Double or Multiple Sampling8212;When double or multiple sampling is to be used, each sample shall be selected over the entire lot or batch.
Inspection Procedures8212;Normal inspection will be used at the start of inspection. Normal, tightened or reduced inspection shall continue unchanged for each class of defects or defectives on successive lots or batches except where the switching procedures given below require change. The switching procedures shall be applied to each class of defects or defectives independently.
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