PWS 2.0_ii_MIL-STD-105E.pdf

NOT MEASUREMENT

SENSIUYE h

MIL-STWI05E

10 MAY 1989

SUPERSEDING

MIL-STD-105D

29 APRIL 1963

MILITARY STANDARD

SAMPLING PROCEDURES AND TABLES

FOR INSPECTION BY ATTRIBUTES

AMSC N/A AREA Qcil

~~~ & Approved for public reiesse; dktribution is Unlimfi

!QL-”SI’D105E

DEPA~ W DEFENSE

Washbgmn, DC 20301

SAT*LDG P~ T I!ND’ZABESFOR INSP=TI@JBYMTNBUES

1. Ttistilitarystandad is approvedfor use by all Depsmmms and Jqencies of - ~~~ of ~f-”

2. Beneficial~.ts Cemmm&tiom. additions,Wetions) and any peeine.ntdatawhi~ may beef usein~this~ shouldbe addressedto:

CnRInancier Us. Amy AmamE!!!Rem-a, Dwelopnent and ‘+-king Ckmer

M-IN: SK?R-BAC-WBM!J. 6

Picatinnytisenal,NJ 07806-5000 by usi..gthe self-a=-essed&.andardization Dmmmt m~ PrepSal (DDFom 1426)~L-hq at the md of this docmmt or letter.

ii ms

MZL-S’IZ+1C5Z

mRE3m*” providessawling proce&res and referwm tables foruse in on the pxobabiiis.icrecu.+mce 05 e%.ts when a sa~iesof-iots or bat~s are produ~ ti a stableenvironmrt.

Thispublicationshouldbe-used to guide the user in the ~kpmnt of an inspee.ionStratw thatprovidesa co=. eff~ive qroach to attaining cm-:idm~ in pro&t user is warnedof the w-.

~liance wi”thca%racaual te-&%i~ reqJ ats. The assumedrisks relativeto the *sem sanple size and

~ifications shouldnot contaknrequirements for use of specific Q.z?s, !23Z shxld “.!y provideAQL’s or H?D’s as a -~rmem.

pkns fc= coxinuous,ra’hr than lot inspection,are contm M iii

~L-.STD-lO5E

GmTmTs

Paragraph 1.

1.1 1.2

2.

2.1

3.

3.1 3.2 3.3 3.4 3.5 2.6 3.7 3.e 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 3.20 3.21 3.22 3.23

4.

4.1 4.2 4.3 4.4 4.4.1 4.4.2 4.4.3

SCOPE

-se *liation

~IxmPEurs-

W. qplicable

=INITIONS

Acq.able Qdality Ievel WE) AverageOutgo ~Quality(lQ) AveraoeOutqoingQualityWt (AOQIJ Classificationof Defects CriticalDefect CriticalDefective Defect D@eccive DefectsPer Ru@edUn its ~i~ ~aim by Attribxes w&or Batdl Im or Batch Size Major Defect Major Defective Minor Defect● Minor Defeaive PercentDefective ~s Average Sanple SanpleSize COde~tt=v Salq?lingPlan unit of Procalct

~mxm=’nm

Written~ NmcVnfozmne Fonmticm and Itificatim of ~ or =Cks. ..

ML use...0...........* Umkation ........● choosingAQU

Page iv mL-sm-lo5E

CcNTmrs - Conttiued.

Paragraph ~B~ 4.5.1 4.5.2 4.5.3 4.6 4.7 4.7.1 4.7.2 4.7.3 4.7.4 4.8 4.9 4.9.1 4.9.2 4.9.3 4.9.4 4.10 4.lC.1 4.lC.1.A 4.1(?.1.2 4.10.1.3 4.10.1.4 4.10.2 4.11 4.12 4.12.1 4.12.2

Sarrpling RepresentativeSan@.ing The of Sanpling..................● Doubleor MQtiple Sampling ~on P~ ....................● WitdlirlgP~ Normalto Tightened......0 Tight- to Normal● .....0 Normalto ~ ..............*.....● **...** Rduced to Normal Disconthtion of~on SanplingPlans ~ion Wvel .................0 Co& utters ~aining San@ing Plan TYF= of sapling Pkns Determinationof~ability P~Defective~ion SingleSanql@ Plan Double Sa@ing Plan FhltipleSanpling.Plan..........● * ~ p~ forRedu*IrqeCtion DefectsPer ?lundmdt?nits~ion Idniting@ality Protection ~s .................* ~t@~merkic ~ A~ge SanpleSizeComes

5. TABES .............*...*...............*

Table I.

II-A.

II-B.

II-C.

III-A.

III-B.

III-C.

Sa@e Size Coda Mitters..............o SingleSan@ing Plansfor Normal- ~im Naster table)

SingleSmpliq Plms for Tightewd ~i~ ~=t~le) o..o-oooo===oo.=.e

SingleSapling Plans for~ ~ia (Mas@rtable)

DoubleSamplingPlans forNormal ~i~ -a~le).. oo......o.BOO

DcxbleSapling Plans for Tight- ~m ~er=e)

DoubleSamplimgP1.ansforReduced ~im (Mastertable)

Page

5:

“7 v

MIL-STW105E

mt’n’mrs- Conthued.

Table

IV-A.

IV-B.

TV-c.

V-A.

V-B.

%3-A.

V3-3.

XI-A.

VII-B.

~*~1-

IX.

Mltiple Sa@ing Plans for Norml Inspectim M3ster-le)

M.dtipleSanplingPlans for Tightened ~im (MastertaMe)

Mdtiple SamplingPlans for ReduOed Inspection(Mastertable)

AverageOutgoinguty IAmit F~s for lwml~on (Sin@e Zq) .....-...o..

~ge Outgo* QualityLimitFa=ors for TightenedIMpeCtiOn (S=le ~1~).:...-..”

uting Quality (h Perumt Def-iue) for Wch a Pa = 10% (forNomal Inspemion, S~le Saxrpling)....................-..-...-*o”

LimitingQuality (inDefectsper ~ Unks) for which the Pa = 10% (forNozmal Inspection,SingleSanplhg).-..---------------

Unliziq Quality (inP~t mfecti=) fo~ khid. “thePa = 5% (forNom@ ~ionl SingleSawling)

LimitingQuality (fiDefectsper Hmdma Units)for which the Pa = 5% (f= W* ~m, Siwle S=@@ ....*

Li,mitNmbersfor ~ Inspection AuerageSampleSize Cumes for DDuble and FmltipleS.mpliq .............-...--.-......-.c-

~ltig pl= and cparatirq~amic Cumes (andData) for:

X-A. San@e Size~ktter A X-3 . Sanple Size~Utter B x-c. SanpleSizeMkter C..........e00-00o X-D. San@e SizeCo& LetterD X-E. SanpleSize~Utter E X-F. San@e SizeMletter F x-G . SanpleSizeMUtter G...............--..-..”- X-H. ~le Size@ckletter H X-J. qksM-~ J............*..”””””.”.”

X-K. SaupleSizeMIetter K.......----------------- X-L. ~le S~M~ L x-M. SanpleSize M~M ...........e X-N. San@eSizeM E~N x-P. Sal@esizeM wtterP . . . . . . . . . . . . . . . ..”....”.

x-Q. ~le S~Mk= Q.......*”+”*.==.*”+”*..= X-R. ~le S@ Mk=R ..................=””~””

Page

32 “ vi x-s.

Paragraph 6.

6.1 6.2 6.3 mL-sl’wlo5E

CCN’TS - Continued.

Page

~~e size~ ~tt~v S

........*..............................● . . . . v

Intf2nckci use Subject’I’em (keyuofi) tist~ ................” 67 ~fr~P~im Issw mlmsAL

F2L-S’ID-105S

1. ~~~

1.2 Pqse. This ~li=tim establisheslot or bat~ sapling plans and proceduresfor ~ion by attributes. ‘1’nispubli=tion shallnot & irfter-p.retedto superm3e or confli= with any amtraCtti ~ s. m words

“awqX”, “a~”, “acceptable”*etc, referonly to the contractor’s use of the sanplingpkms Writ- in this ~anddonotinplyana~ W -theGove&mmnt to acceptany prcdom. Deterfninationof aqability by the Gwen ‘:=% shallk as desm~ in contractual~ts. me Sarfplingplans *sdhd in Ws standad m awli-le to U’s of .01pe~t or ~~ and are‘the.refore not suitablefor ++licationswherequality1-1s ;az.sper millionrange m be realiz05.

in the defemive are applicable, a.

b.

c.

d.

e.

f.

9.

h.

ElrIcitems.

Cmponents

Qerations

Materialsin process.

Su@ies in storage.

Maintenance~ations.

Data or records.

Mmbistrative ~-

Theseplans are intendedprimarilyto be used for a continuingseriesof lots 0: batches. The plans may alsobe used for the inspectionof isolatedlots or Mches, W., in MS latter=, m = K =i~ to ~t ~ ~m characteristicmrves to find a plan whichwill yieldthe desiredprotectim (see4.11).

2.

2.1

3.

N&. -liable.

=INITICNS

FEL-S’IW105E

3.1 z ~ableQualityLevel (ML) . When a mntinuous seriesof 10Es is considered,the AQiiis tbe qualitylevelfib, for the roses of sa@@ ~.ion, is the limitof a satisfactoryprocessaverage (Se 3.19).

NOTE: A sanpl~ plan and an AQL are chosenin accordanm with the risk assured.

Useofa@ueoflQL fora a2rtain&!fector groupof &fec5s indicam that the ql~ PM till acoeptthe -t majorityof the lotsor bata pbded the prooess-X levelof ~ defectiwe(or&fects per huxlredunits) in these lots or batchesbe no greaterthan the ~ignated value of A& Thus, the AQL is a ckignated value of ~ defective(or&facts per hundredunits) for fich btswill~a~+m~oftk timbythesaqlingp ~re bing used. The

~liw pl~ prfi~ here~ ~ ~ ~ tit ~ p~i~ty of a~ at the ~ignat~ A@ ~ue ~ ~ the sanplesize,~ Z~N ~Xr :0= 1~~ samples-n for mall ones, for a givenAQL. The AQL alone does not idelm=ify the chanoes of aqing or rejectingindividual10Ls or batchesM m.-dire- ~..-y relatesto whatmight be ~ed fruna seriesof lots or batches, prm”i- * steps indi=ted h -s publi~tion aze “taken.lt is ~sary to =eYer to the operattigdarad.=”iscic~ of t.teplan to *texmine the relative risks.

3.3 AverageQxqoing QualityLimit (ADQL). The M(2L is the maximum ACQ fora

9L~ a9L~~ -lW pkn. Factorsfor ~@? ML tiues are givm M Tabie V-A for each of “~ singlesaqlimg plans for normalirqection and in TableV-3 for each of the singlesmpling plans foz tightened~ “on.

3.4 ClassifimEion of Defects. A classificationof defectsis t!! enumerationof pcsstiiedefects of the unit of pxduct classifiedamrdirq to their seri~.

3.5 Czlti~ DefS&. A criticaldefectis a ~fect that j~ and ~ri=ce ~mte would resultin hazardousor unsafeconditionsfor individualsUS*, --, or

~upontheprodwt, ora ~fecttbat~ti experim indicate is likely to prevent perf~ of ttE ~cal fun-on of a major * itm SU* as a Ship,aixuaft# tank,nbsile, or ~ title.

3.6 Critidl Defective. A criticalckfectiveis a unit of prockt uhi~ contti one or mre criti~ defectsti may also contdn mejor and/or minor defects.

3.7 Defect.,A defectis any nonconformanmof the unit of productwith specimTEi%@l=mts .

laks’m-lo5E

3.8 Def-.ive. A def=~ive is a unit of productwhich containsone or mre defe.s.

3.5 Defe.s per HunckedUnits. The nwber of defe=s per hundredunits of ~Y gim quantityof units of productis one hundredtimesthe mm&r of &fects con=zinedtherein (oneor mme *fec&s being possible in any unit of product) diviti by the total nunberof units of product,i.e.:

Defects p“ = Nunberof &fects x 100 hundredunits Nmbar of units ~~

3.2C Impaction. Inspectionis the processof ~imt ~gt testmt cr o-.?m.isecmparing the unit of pmdu~. with the reqair-nts.

7,1i T--- ~io~ by Attribtes. Inspectim by attributesis inspectionwhe~ eizher‘& unit of productis classifiedsimplyas defectiveor non+ef=eive, or ~he numberof defe~.sti the unit c= prcdue.is courted,with re~st to a givm ~~:i~m or set or requirements.

3.12 tit or -t&l. The term lot ox katch shall man “inspectionlot” or “i==se.ion batcb.”,i.e., a collee.ionof unitsof productfrom whi~ a sanple is EC be dram and i~ed md may dif5erfrm a mll-~ion of units designated as a 10= or bat~ for 0“= purposes (e.g., production,shipnent,etc.).

3.13 bt or BatchSize. The lot or ~t~ size is the number of units of prtib A a lot‘0:bata.

3.14 M3jorDefect. A majordefecL is a -fact, otherthan criti-, that is liKelyto resultin failure,or to reducemateriallythe usabilityof the unit of productfor its int- ~-

3.15 ~ajor * f~i~.

0: mre majordefects, defect.

A majordefectiveis a unit of productwhid? containSone

* may alSO contain rrtiordefecLsbut containsno aiti-

3.16 MinorDefect. Anbm~i.Sa&fti~t isnot-yto~

materiallythe usabilityof the unit of productfox its int- puzpose~m is e &par&m fran ~ ~WviIgU*~@m tkeffeCtiWUSec operatim of the unit.

3-17 MinorDef-i-. A minordefectiveis a unit of P-a M* ~ ~--- -— . . . — ox more minor &facts mtamtains no aititi or major*feet.

!!GL-SB105!2

3.16 Per-m Defective. The percent &femive of any givm quantityof units of produe~is one hur&4 tires the n~- of defemive units of prda~. contairEd thereindiviti by the total mmber of units of produa, i.e.:

?ercentDefective = Nmber of &fectives x 100 ~“ of lmits ~ed

3..19ProcessAverage. The Drocess averageis the average~t &fective or averagenmber of &fects pez hw@red units (whichever is ~li~le) of product szhitted by the sq@ier for originalinspection. Originalinspectionis ~ firstinspectionof a pa.z.zicula.rquantityof produceas d.istinguis@dfranthe ~ion of productwhi~ has been resu&nittedafterprior rejection.

3.2C Sa~le. A sampleconsi=.sof one or mre u..irsof productdrawn fran a 10= or &z&, the units of the sem@e being sele~beda= randomwithoutr- to their q~z:icy. ~ nmtx= C: units of productin the sampleis the sarplesize.

3.22 SampleSize Coae Utter. The sanplesize code letter is a deviceused ElO.ngWitihthe WA fcr l-tins a sapling plan cma table cf semplingplans.

3.22 Sa?’@hg Plan. A sanplingplan indc!cacesthe nunt?erof unitsof product fromeat’.io= or bat&.which m to be insoectad (sanplesize or seriesof sa@e sizes)and the criteriafor cke.rmi.%ngthe acceptabilityof the lot or batch (acceptan02anc rejectionnumbers).

?.23 ‘Unitof Prodxz . The unit of produ~.is the thing inspectedin o-r to &.emme lts classif~mtion as defectiveor non-def-hive or to countthe ~“ of +.fecbs. It my be a singlearticle,a p&ir, a set, a hmgth, an =8 ~ operation,a volme, a cmpcmmt of an end product,or tlw end prociuaitself.

The unit of p~GL may or my not be the same as the unit of ~, SWPIY, production,or sh.ipnent.

4. QN=AL RmJIm=m

4.1 Written P~ . Writtenp~. are o~ily davelopedami made

avaalablefor * Govemmm ~ “Ve’s~,lqmnmquast. --writtenp~ indime me of this stmdard, they shallamply with -mq’111raErltsof this stmdard arxlZefermce appropriate~ as ~.

4.2 Nonconformance. ‘he extent of nonconf~ ofpro&ct sbaube=rP=-eitherin terns Of peroentCkfectiveor in term of ckfectsper ~ titS.

MIPST’D-105E

4.3 Fo.mationand Identificationof Uts or Bat&es. Theproductshauke as-led into i-tifiable lots, -lots, batches,or in - otkr manneras may be paaibed . Ea* lot ox bat~ shall,as far as is practicable,mnsist of unitsof prcduct of a singletype, grade,class,size,and composition, manufacturedunder es-tially the sam renditions,and at .

~ythesam tine . The lots or bat- shall be itified by the contractorand shallbe ke intar.in adequateand suitablestoragespace.

4.4 AQL.

4.4.1 AQL use. The AQL, to@ther with the SaupleSizeb& Letter,is used for. ~ ln&?Lnc the sapling plansp.mcw herein..

4.4.2 Iimita:ion. The selectionor use of an AQL shallm. inplythatthe cwcractor has the rightto sm@ y any defecEivewilt of product.

4.4.3 Chmshc ?@’&. Diff~t ~Ls IllSybe Chosenfor ~ of &fects

cms.ide.redcolle.+.ively, or for individual&fee&s. An ML for a groupof &fec my be tiosenin a~cion to AQM for individualdefects,or mkqraps, within chat group. AQL values of 10.0 or lessmy be expressedeitherin ~t &fective or *. ~fects ~- hunckd units;thoseover 10.0 ZhaU be qressed ix defe.s per “h!mdmd units only.

4.5 Saxlplinq.

4.5.1 Repmsmt ative (Stratified)Satrplinq.When ~ropriate, the rnzr&rof unitsin the sanple shall& sel~ed in proportionto the size of subletsor -bat-, or -s of tM lot or bat~, idmtified by q rationalcriterior when represemathHaIcpMngiswad,121e units franeaal part of the lot or batdi shallbe select”edat ranch.

4.5.2 Time of San’Plhq A samplemay be dram afterall

the lot or batch have bi+enassembled,or sarrpleunitsmay of the lot or bat~, in uhi~ case the size of the lot or

Sublet,sub-batch or the unitscaprising be drawnduringassak M* till k *te* kefore any ample units are dram. If tk sampleunitsare drawnduringas~l~ oftklot or batda, mdif tkrejectionnmb2ris ~m!foreth lotis Curpleted,that pomim of U lot almldy cxmpletedshallbe @ected. m a oftkdefective ~shall bedmermined and ammctive actiontaken,after &ichanewl otorbat*shgd.lk *.

4.5.3 Doubleor Mltiple Saup ~1

used,ea~ qle shallbe selecte&

WherI&&le or Ovar the entire mkiple sauplingis to be lot or bat~.

IaL-s’Iwlc5E

4.6 ~ion Pr~. Normalinspectionwink-at the startof inspection. Normal,tightenedor redu~ -bion shall continueundwqed for each class of def~s or &fectiws an sumsive lotsox batd7esexq. where the %it~ p~ givm klw require -. m swit~ P~? *1 be -lied to each class of ckfecSs oz &2f_iveS <~Y”

4.7 %?it- P~es .

4.7.1 Normal to Tightened. ~ normalinspectionis in effect,ti@tened *mim shallk institutedwhm 2 ouc of 2, 3, 4, or 5 comecutive lots or batcheshave been rejettedon originalhspection (i.e.,ignoring~ “tted lots 0: btC!!S fOr thiS Fr~) .

4.?.2 Tig?l:eneeto No.mal. When tightened~ion is -b effect,no.mbal inspecuon shailbe instituted*=I 5 consecutive10:sor baccbeshave -n co.nsidey-a-ptable on original~ on.

4.7.3 No.mal to R@xed. When normalinspectionis in effect,reducedir++ion shal1 be -.ituted providedthat all of the followi~ conditionsare satisfied:

6. Tne pretig 20 lotsox bat- (ormre, as indicatedby EYW note tc Ta5~eVIII) have bee!!on no.mal~ction aiidall have ben acceptedon original inspection;and

b. The.total nurber of ckf-i= (orbf~) fi ~ ~~es ~ ~ p.receding 10 lots or batches (orSU* Ot&r mmber as was used for condition“a” -) is equalto or less than the a@i-le nmber given in TableVIII. If dable or mikiple smpling is

+les only; imd

Pro@cLion is at a

RE!cked~ “on in use, all samplesinspectedshouldbe ~ti-, steadyrate; and is consi&rr &sirable.

4.7.4 RedWed to Normal.

shallbe institutedif any

a. A lot or bat~

b. A le. Or batd) 4.10.1.4,or

_ ~ ~ion is in effect,normal inspection of - follcwingomu on originalinq3acEcion:

is rejected;or is comi- acceptaMe underthe procedueS of

c. Productionbecmes -= or dela~; or

d. Otherconditims ~ant that normalinspectionshallbe instituted.

MIL-SIW105E

4.8 Discontinuationof 1~ ion. If the cumulative nmber of lots not acce~.edin a sequenceof mnsecmive LuLs on originaltightmed inspection r~achesfive,the acceptan~ prm3dures of this standardshallbe discontfiued.

Inqlm un~- the provisims of *thisstandardshallnot be ~ until mrrective actionhas ~ takZ7. Tigthened~ion shall then be used as if 4.7.1had been invoked..

4.9 SanplinqPlans.

4.9.1 InspectionM. The inspectionlevel&termines the rela+~onship~ the lo: or &t* sizeand the sanplesize. Thehspemion levelto be used for any pa.mieti~-re@~c will be as prescribedby the contractor’swritten P-~ -“-es. Threein.spec.ionlevels:I, II, and 111, are g:van in Table I for ge-.-eraiuse (see4.1). Normally,hspee~ion Level II is us-. Hmmmr, In~=.ion @vel I my be used whm lessdis=”wtion is needed,or Ievel 111 my be used for greaterdiscrtition. Four additionalspeciallevels:

S-1, S-2, S-3, mti S-4, am gimn in the same tabieand my be used where relaciveiysmallsanpiesizesace necessaryand largesa@ing risks can or W.

& mlerat~.

N3TE: In the selectionof inspee.im ievelsS-1 tc S-4, ~ must be exercised avoidAQii mm.asistentw“iti.these ~eion levels. Lm OLk” words, the ~ of the special inspemion levels is to keep sanplessmallwhen ~saxy. For in.stanae,the code iectersunderS-1 go no funk: than D, equivalentto a siql sanpleof size 8, but it is cf nc use to chooseS-1 if the AQL is 0.10~. f whichthe mhinm ample is 125.

4.9.2 Co& Letters. Sanplesizesare designatedby wck letters..-Table I shal be used to findt& applicableco& letterfor the ~icular lot or batch size and the p~iked impectl“onlevel.

4.’3.3retainingSallplillgPlan. TTieAQLandthe m& lettershallbe usedto =ain tne sanpl.irqplan franTablesII, III, or IV. Whm no sapling plan is availablefor a givencabination of AQL and code letter,the tablesdirectthe user tc a differentletter. Thesa@e size to beusedisgLvm bythenew co& letter,not by t& originalletter. If this p~ leads to differentsample sizes for diff~ classesof &fects, t& code letterm .

~ sa@e sizederivedmay be used for all ~tothe

Classesof defec+s. & an alternativeto a sirqlesauplii plan with an ~ ~ofo, the plan with an a~ m.mberof lwithitscomeqmmbg ly Mqer sauple size for e &signated AQL (wkre available), may be ~.

MIL-S’ID-105E

4.9.4 Typesof Sanpling Plans. Three types of sapling plans: Single,Double, and Wlziple, are givm h TablesII, III, and IV, respectively.Whe!!several :ypes of plans are availablefor a givenAQL and code letter,any one may be used.

A decisionu to t= of plan,eithersingle,double,or titipler ~ ~l~le for a given ~ @ * letter, will ~ly & ~ ~ * ~ison bet= the administrativediffitity and the ~ge sanplesizesof the availableplans.

7he averageszmplesize of multipleplans is lessthan for -Ie (~ M ~ case co.~ to si@e aqance n-- 1) and both of these m always less than a si~le qle size (seeTable IX). US@lY m ~~a”~ve difficultyfor singlesmpling and the cost per unit of the sanple are lessthan for doubleor mltiple.

4.lG Daennina:ia of Amsmability.

4.2G.I Pe~nt Defeaive Inspection. To determinea~ ility of a lot or bate!!mder percentdefectiveinspection,the appli-le. San@@ plan shallbe used in accodance with 4.10.1.1,4.10.1.2,4.10.1-3,@ 4.3~.l.4.

4.IC.I.2 Shgie SanpLingPlan. The n-” of sanpleunits inspecxedshallbe qua2 tc the sanplesize givm by the plan. If tk n-v of =f-.i- f- ~ the sampleis equalto or lessthan the aqan~ rnmber,t& lot or bat~ shall ‘m consideredaqable. If the nmber of &feccives is equal to or great-”than the mjemion nwker, the 10= or bat~ shallbe rejected.

4.10.1.2 DoubleSamplinqPlan. Anuberof sa@eunkS6S?ud to the first sa@e sizegiw by the plan shallbe inspected. If the mmber of def=ives foundm the firstsanpleis equalto or lessthan the first~ nmber, the lot or bat- shallbe consi- a~le. If tb ~ of W-W foundinthefirst sampleis equaltoorgmater than the firSt z@eCtim~l the lot or batd shallbe rejected. If tb nmber of &fectives fomd in & firstsanpleis betweenthe first~c and rejectionxnzc&rs,a ~ sanpleof the sanesize shallbe ~ed. TM ~ of a-i= f- in the fixstand secmd aanpks shallbe ammlated. If the ~tiw ~ of *fectives isaqualto or lessthanthesemnda~ mmber, the lot or batd shallh cmsickred a~le. If the cmdative rnmberof &fectives G equal toorgreaterthan~~ rejectim~,t&lOtOrk* aballbe = jetted.

4.10.1.4 special P~for~xnSJect im. - Xed13=d~im * Sanplingpmoadura may t~ Withultaith=ac=pt== or rejectionaiteria m--” ~ *l~or=*~~be--acceptable,but normal reinstatedstartingwith the next lot or batch (see4.7.4.b).

mL-Slmlo5E

4.10.2 Defectsw HundredunitsInspection.To &temine ~ a-ability of a lot Or batti k- &feCts ~“ hundredunits~ ion, t& promdure specified forpemem 63feGive inapecxionaboveshallbe “-, ex~ that the woti “defects”shallbe substitutedfor “ckfectives”.

4.~1 ~i” mg QualityProtection.The sanplingplans and associated~ given m this@liatim weredesignedfor use _ the units of productare prodmed in a continuingseriesof lots or batches mer a period of tire.~t ‘” the lot or batti is of an isolatedmm, it is ~irable to limitthe =lec&im of sarrplingplansto those,associatedwith a ck2signatedML mlw, Z prouidenot lessthan a ~fied limitingqualitypmtectim

● -W pldns for this purpose-. be selectedby dmosing a LimitingQuality (L@ and a ~’s risk to be associatedwith it. TablesVI andVII give values of W for the the cmnonly used ‘bonsmer’srisksof 10 ~at and 5 ~t ~bively. If a tiffe.mc valueof co~’ s risk is recpired,the O.C. cumesandtheirtabu-lazedvaluesmy be used. The conceptof IQ may also be useful in specify+q the L-L and ~~.i on Levelsfora seriesof lotsor bat-s, thus fixim mimmm s*ie size-vherethere is saw reason for avoiding corsmer’s risk)more than & Limking p~rtion of singlelot or bat~..

(withmre than a-gima def-kives (ordefects)in any

4.X2 Cum?es.

4.12.1 @crating Characteristic~s. The qerathg ~ctaistic mmes for normal-~ion, shownin TableX, indi~=e the pe.roentageof lots or kt~ whAtimay be ~ed to be acceptedunderthe varioussapling plans for a given pmoess @ity. The mmes shownare for singlesapling; cumes for tile and mlziple saqling are xmtchedas closelyas p-i-le. The O.C. cumes shown for AQIs greaterthan 10.0are based on the Poisson&ibution ti are ~li- ~le fo= defectspax hundredunits i.nsp&tion;those for~ of 10.0 or less and sanplesizesof 80 or lessareM on the binanialdistrikmim and azz applicableforper- defecLive~-ion; those for AQE of 10.0 or less and sarplesizes1-- than 80 am based the Poissondistributionand m ~li-le eim- for defeczsper hundredunits hsoection, or for percentde@ctive inspection(thePoissm distribution&&g an ~te q~ .Onto the timid distrih.tim - theseconditions). TaMhted mluas, selectedvaluesor pmhabilitiesof aqanue (Pa,in ~) are gi- f= a& ofth CUmes -, an& in addition,for tightenedimpectx“on,and for M-perhundred units for ZoflO. O orlessand sauplesizesof800r less.

4.~2-2 Amage Sqle SizeOzrves. Averageample size mrves for ~le @ mltiple sanplingam in TableIX. = showthe averagesa@e sizeswMA may be qed to omzr un&r the varioussa@ing plans for q- levelsof prooess quality. The cumailmnt of ~im aml are ~roximte the m-t tha-m e= upon the Poissondistribution,and that the s&e sizes for doubleand multiplesamli.ngare assmed to & 0.631nand 0.25n respectively,where n is the size.

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STANDARDIZATION DOCUMENT IMPROVEMENT PROPOSAL

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