MIL-STD-1916 DOD Preferred Methods for Acceptance of ProductThe purpose of this standard is to encourage defense contractors and other commercial organizations supplying goods and services to the U.S. Government to submit efficient and effective process control prevention procedures in place of prescribed sampling requirements.

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MIL-STD-1916

Continuous sampling (Table IV):

2 nonconforming units are found within a period of inspections (whether on sampling or screening) totaling no more than 5 times na(N).

5.2.1.3.2  Tightened to normal.  When tightened inspection is in effect, normal inspection may be instituted when the following conditions are both satisfied:

a.     The cause for producing the nonconformances is corrected. b.     Lot or batch sampling (Tables II and III):

5 consecutive lots/batches are accepted. Continuous sampling (Table IV):

No  nonconforming  units  have  been  found  within  a  period  of  inspections

(whether on sampling or screening) totaling at least 5 times na(T) units.

5.2.1.3.3  Normal to reduced.  When normal inspection is in effect, reduced inspection may be instituted when the following conditions are all satisfied:

a.     Lot or batch sampling (Tables II and III):

10 consecutive lots/batches are accepted while on normal inspection. Continuous sampling (Table IV):

No  nonconforming  units  have  been  found  within  a  period  of  inspections

(whether on sampling or screening) totaling at least 10 times na(N) units .

b.     Production is at a steady rate.

c.     The contractor's quality system is considered satisfactory by the Government. d.     Reduced inspection is considered desirable by the Government.

5.2.1.3.4  Reduced to normal.  When reduced inspection is in effect, normal inspection shall be instituted when one of the following conditions occur.

a.     Lot or batch sampling (Tables II and III):

A lot/batch is withheld from acceptance. Continuous sampling (Table IV):

A nonconforming unit is found.

b.     Production becomes irregular or delayed.

c.     The contractor's quality system is unsatisfactory.

d.     Other conditions warrant that normal inspection be re-instituted.

5.2.1.4  Discontinuation of acceptance.  If sampling inspection of lots or batches remains in tightened inspection due to discovery of nonconformances or when, on continuous sampling

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