MILPRF50884F
APPENDIX C
C.2.3 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the
text of this document and the references cited herein, the text of this document takes precedence. Nothing in this
document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
C.3 DEFINITIONS AND SYMBOLS
C.3.1 Definitions. The following definitions shall apply for all statistical sampling procedures:
a.
C = 0 sample plan: The C = 0 sample plans are defined as a combination of a test specimen usage
identifier (see C.3.1.b) and a sample size series (see C.3.1.c). The resulting C = 0 sample plan will be a two
character designator combination that identifies the sample size series that is to be with a type of test
specimen for a particular verification (see C.4.5).
b.
Test specimen usage identifier (see C.4.5 for examples): The following usage modifiers are used to
differentiate when a particular plan is to be used for a particular test specimen:
(1)
The letter "B" will be used to signify that production printed wiring boards are to be sampled.
(2)
The letter "T" will be used to signify that test coupons are to be sampled based on the number of
panels in the lot.
(3)
An asterisk "*" will be used for either printed wiring boards or test coupons.
c.
Sample size series: The sample size series is defined as the following series of letters: A, D, F, H, J, L, and
d.
Tightened inspection: Tightened inspection is defined as inspection performed using the next sample size
value in the sample size series lower than that specified.
e.
Acceptance number (C): The acceptance number is defined as an integral number associated with the
selected sample size which determines the maximum number of defectives permitted for that sample size.
f.
Rejection number (R): Rejection number is defined as one plus the acceptance number.
C.3.2 Symbols. The following symbols shall apply for all statistical sampling procedures:
a.
C: Acceptance number.
b.
R: Rejection number.
C.4 STATISTICAL SAMPLING PROCEDURES AND SAMPLE PLAN TABLE
C.4.1 General. Statistical sampling shall be conducted using the C = 0 method. The C = 0 method as specified
herein is a sampling plan that provides a high degree of assurance that a lot having a proportion defective greater
than the specified acceptance number (C = 0) will not be accepted. For all situations, the acceptance number (C)
shall be equal to 0 (C = 0) and the rejection number (R) shall be 1 or greater (R ≥ 1).
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