MIL-STD-1916
TABLE I. Code letters (CL) for entry into the sampling tables
5.2.1.2 Sampling procedures. Sampling is performed at one of three stages called normal, tightened, and reduced. Unless otherwise specified, the VL stated in the contract shall be considered the normal stage of inspection and shall be used at the start of inspection. The tightened and the reduced stages are then defined as the stages to the immediate left and right, respectively, of the initial stage. The sampling inspection stage in effect shall continue unchanged for each group of characteristics or individual characteristic except where the
switching procedures given in paragraph 5.2.1.3 require change. The switching procedures shall be applied to each group of characteristics or to individual characteristics.
5.2.1.3 Switching procedures. The procedures for switching among normal, tightened, and reduced inspection are given as Note (2) in Tables II, III, and IV.
The switching procedures are independent of the results of any remedial action, such as screening, additional samples, etc., resulting from the occurrence of sample nonconformances and withholding of acceptance.
Some Table IV switching criteria depend upon a corresponding Table II entry. These entries have been denoted by na(N) and na(T) in the descriptions that follow. na(N) represents the Table II sample size used for normal sampling at the VL and CL currently in effect. Likewise, na(T) represents the tightened sample size.
5.2.1.3.1 Normal to tightened. When normal inspection is in effect, tightened inspection shall be instituted when one of the following conditions occurs, depending on the type of sampling plan being used:
Lot or batch sampling (Tables II and III):
2 lots or batches have been withheld from acceptance within the last 5 or fewer lots or
batches.
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