U.S. Department of Defense MIL-STD-105D — MIL-STD-105D Sampling Procedures and Tables for Inspection by Attributes Manual PDF (EN)

Downloaded from https://www.everyspec.com 2 . C L A SS I F I CA T I ON O F D E F E C T S AND D E F E C T I V E S 2.1.3 MINOR DEFECT. A m i n o r d e f e c t - 2.1 METHOD OF CLASSIFYING DEFECTS. A c l a ss i f i c a t i o n of d e f e c t s i s t h e e nu m e r a t i o n of p o ss i b l e d e f e c t s of t h e un i t of p r o d u c t c l a ss i f i e d a cco r d i n g t o t h e i r s e r i o u s n e ss .

A i s a d e f e c t t h a t i s n o t li k e l y t o r e d u c e m a - t e r i a ll y t h e u s a b ili t y of t h e un i t of p r o d u c t fo r i t s i n t e n d e d p u r p o s e , o r i s a d e p a r t u r e f r o m e s t a b li s h e d s t a n d a r d s h a v i n g li tt l e b e a r - d e f e c t i s a n y n o n co n fo r m a n c e of t h e un i t of p r o d u c t w i t h s p e c i f i e d r e q u i r e m e n t s . D e f e c t s i n g o n t h e e ff e c t i v e u s e o r o p e r a t i o n of t h e w ill n o r m a ll y b e g r o u p e d i n t o o n e o r m o r e of t h e fo ll o w i n g c l a ss e s ; h o w e v e r , d e f e c t s un i t .

m a y b e g r o u p e d i n t o o t h e r c l a ss e s , o r i n t o 2,2 METHOD OF CLASSIFYING DEFEC- TIVES. A d e f e c t i v e i s a un i t of p r o d u c t w h i c h co n t a i n s o n e o r m o r e d e f e c t s . D e f e c t i v e w ill s u b c l a ss e s w i t h i n t h e s e c l a ss e s . 2.1.1 CRITICAL DEFECT. A c r i t i c a l d e - f e c t i s a d e f e c t t h a t j u d g m e n t a n d e x p e r i e n c e u s u a ll y b e c l a ss i f i e d a s fo ll o w s :

un s a f e co n d i t i o n s f o r i n d i v i d u a l s u s i n g , i n d i c a t e i s li k e l y t o r e s u l t i n h a z a r d o u s o r d e f e c t i v e co n t a i n s o n e o r m o r e c r i t i c a l d e - f e c t s a n d m a y a l s o co n t a i n m a j o r a n d o r 2.2.1 CRITICAL DEFECTIVE. A c r i t i c a l m a i n t a i n i n g , o r d e p e n d i n g u p o n t h e p r o d u c t ; o r a d e f e c t t h a t j u d g m e n t a n d e x p e r i e n c e i n d i c a t e i s li k e l y t o p r e v e n t p e r fo r m a n c e of t h e t a c t i c a l f un c t i o n of a m a j o r e n d i t e m s u c h m i n o r d e f e c t s . N O T E :

F o r a s p e c i a l p r o v i - s i o n r e l a t i n g t o c r i t i c a l d e f e c t i v e , s ee 6.3. v e h i c l e . N O T E : F o r a s p e c i a l p r o v i s i o n r e - a s a s h i p , a i r c r a f t , t a n k , m i ss il e o r s p a c e 2.2.2 MAJOR DEFECTIVE, A m a j o r d e - f e c t i v e co n t a i n s o n e o r m o r e m a j o r d e f e c t s , l a t i n g t o c r i t i c a l d e f e c t s , s ee 6.3. a n d m a y a l s o co n t a i n m i n o r d e f e c t s b u t co n - t a i n s n o c r i t i c a l d e f e c t . -) 2.1.2 MAJOR DEFECT.

A m a j o r d e f e c t i s a d e f e c t , o t h e r t h a n c r i t i c a l , t h a t i s li k e l y t o r e s u l t i n f a il u r e , o r t o r e d u c e m a t e r i a ll y t h e u s a b ili t y of t h e un i t of p r o d u c t fo r i t s 2.2.3 MINOR DEFECTIVE. A m i n o r d e - f e c t i v e co n t a i n s o n e o r m o r e m i n o r d e f e c t s i n t e n d e d p u r p o s e , b u t co n t a i n s n o c r i t i c a l o r m a j o r d e f e c t , 3 . PE R C E N T D E F E C T I V E AND DEFECTS PER HUNDRED U N I T S NONCONFORM. ANCE.

The e x t e n t of n o n co n fo r m a n c e of 3.1 EXPRESSION OF Number of defective Percent defective = Number of units inspected x lM p r o d u c t s h a ll b e e x p r e ss e d e i t h e r i n t e r m s of p e r c e n t d e f e c t i v e o r i n t e r m s of d e f e c t s p e r 3.3 DEFKTS PER HUNDRED UNITS. The hun d r e d un i t s . g i v e n q u a n t i t y of un i t s of p r o d u c t i s o n e nu m b e r of d e f e c t s p e r hun d r e d un i t s of a n y hun d r e d t i m e s t h e nu m b e r of d e f e c t s co n - d e f e c t i v e of a n y g i v e n q u a n t i t y of un i t s of 3.2 PERCENT DEFECTIVE.

The p e r c e n t t a i n e d t h e r e i n (o n e o r m o r e d e f e c t s b e i n g p r o d u c t i s o n e hun d e r d t i m e s t h e nu m b e r of p o ss i b l e i n a n y un i t of p r o d u c t ) d i v i d e d b y d i v i d e d b y t h e t o t a i nu m b e r of un i t s of p r o d - d e f e c t i v e un i t s of p r o d u c t co n t a i n e d t h e r e i n t h e t o t a l nu m b e r of un i t s of p r o d u c t , i . e . : u c t , i . e . : Defects p e r Number of defects hundred units = Number of units inspected x 100 2