MIL-PRF-11264F
a. Classification of defects. A classification of defects is the enumeration of
possible defects of the unit of product classified according to their seriousness. A defect is any
nonconformance of the unit of product with specified requirements. Defects will normally be
grouped into one or more of the following classes: critical, major, and minor defects. Also,
defects may be grouped into other classes or into subclasses within these classes.
b. Critical defect. A critical defect is a defect that judgement and experience
indicated would result in hazardous or unsafe conditions for individuals using, maintaining, or
depending upon the product, or a defect that judgement and experience indicate is likely to
prevent performance of the tactical function of a major end item such as a ship, aircraft, tank,
missile, or space vehicle.
c. Critical defective. A critical defective is a unit of product which contains one or
more critical defects and may also contain major and/or minor defects.
d. Defective. A defective is a unit of product which contains one or more defects.
e. Formation of lots or batches. The product shall be assembled into identifiable
lots, sublots, batches, or in such other manner as may be prescribed (see 6.5.l). Each lot or batch
shall, as far as is practicable, consist of units of product of a single type and composition,
manufactured under essentially the same conditions, and at essentially the same time.
f. Lot or batch. The term lot or batch shall mean "inspection lot" or "inspection
batch", i.e., a collection of units of product from which a sample is to be drawn and inspected
and may differ from a collection of units designated as a lot or batch for other purposes (e.g.,
production, shipment, etc.).
g. Lot or batch size. The lot or batch size is the number of units of product in a lot
or batch.
h. Major defect. A major defect is a defect, other than critical, that is likely to result
in failure, or to reduce materially the usability of the unit of product for its intended purpose.
i. Major defective. A major defective is a unit of product which contains one or
more major defects, and may also contain minor defects but contains no critical defect.
j. Minor defect. A minor defect is a defect that is not likely to reduce materially the
usability of the unit of product for its intended purpose, or is a departure from established
standards having little bearing on the effective use or operation of the unit.
k. Minor defective. A minor defective is a unit of product which contains one or
more minor defects but contains no critical or major defect.
l. Presentation of lots or batches. The formation of the lots or batches, lot or batch
size, and the manner in which each lot or batch is to be presented and identified by the supplier
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