Downloaded from https://www.everyspec.com ,, ,.,’ .,, MIL–STD-81OB ., .+ 15 June 1967 S t e p l U s i n g o n e e d g e a s a p i v o t , li f t t h e o pp o s i t e e d g e of t h e c h a ss i s i t s h a ll b e i m p a c t e d t w i c e i n e a c h d i r e c t i o n of e a c h orientation a t s p ee d s of 8, 9, a n d 10 un t il o n e of t h e fo ll o w i n g co n - m il e s p e r b o u r ( t o t a l of 12 i m p a c t s ) . d i t i o n s occ u r s ( w h i c h e v e r oc- c u r s f i r s t ) : 3.8.1 Amar’atus. T h e fo ll o w i n g e q u i p m e n t ( a ) T h e c h a ss i s fo r m s a n a n - w ill b e n e c e ss a r y t o p e r fo r m t h i s t e s t :
g l e of 45 d e g r ee s w i t h t h e (a) T h r ee o r d i n a W r a il r o a d c a r s , o n l y o n e of w h i c h i s a t l a t c a r , w i t h h o r i z o n t a l b e n c h t o p . s t a n d a r d d r a f t g e a r co u p li n g s . ( b ) c h a ss i s h a s b ee n r a i s e d 4 T b e li f t e d e d g e of t h e A p r i m e m o v e r fo r m o v i n g t h e c a r s . i n c h e s a b o v e t h e h o r i z o n - t a l b e n c h t o p . (b) (c) A c a li b r a t e d m e a n s t o d e t e r m i n e t h e s p ee d a t time of i m p a c t w i t h i n & 5 p e r c e n t . (c) T h e li f t e d e d g e of t h e c h a ss i s i s j u s t b e l o w t b e p o i n t of p e r f e c t b a l a n c e .
(d) Acc e l e r o m e t e r s a n d a ss oc i a t e d c i r - c u i t r y t o m e a s u r e t b e i m p a c t s h O c k , L e t t h e c h a ss i s d r o p b a c k f r ee l y t o t h e h o r i - i f r e q u i r e d b y t h e e q u i p m e n t s p e c i - f i c a t i o n . z o n t a l b e n c h t o p . R e p e a t , u s i n g o t h e r p r a c t i - c a l e d g e s of t h e s a m e h o r i z o n t a l f a c e a s p i v o t p o i n t s , fo r a t o t a l of fo u r d r o p s . 3.8.2 Performance of test.
S t e p 2 R e p e a t s t e p 1, w i t h t h e t e s t i t e m r e s t i n g o n o t h e r f a c e s un - t il i t h a s b ee n d r o pp e d fo r a t o t a l of fo u r t i m e s o n s a c h f a c e o n w h i c h t h e t e s t i t e m co u l d b e (a) T w o c a r s w ill a c t a s b u ff e r c a r s ~ a n d b + l oc a t e d o n a l e v e l s e c t i o n of t r a c k . T h e a i r b r a k e s s h a ll b e s e t i n t h e e m e r g e n c y a pp li c a t i o n p o s i - t i o n o n b o t h c a r a . T h e t o t a l b u ff e r p l a c e d p r a c t i c a b l y d u r i n g s e r - l o a d e x c l u d i n g c a r w e i g h t s s h a ll b e b e o p e r a t i n g d u r i n g t h e t e s t .
A t t h e co n c l u s i o n of t h e t e s t , t h e t e s t i t e m s h a ll b e o p e r a t e d a n d t h e r e s u l t s co m p a r e d w i t h t h e v i c i n g . T h e t e s t i t e m s h a ll n o t ( b ) T h e t e s t i t e m s h a ll b e m o un t e d o n t h e e n d of t h e t e s t c a r (f l a t ) i n 140,000 p o un d s m i n i m u m . d i r e c t co n t a c t w i t h t h e f l oo r a n d a d e q u a t e l y b l oc k e d a n d s e c u r e d t o d a t a o b t a i n e d i n a cco r d a n c e w i t h s e c t i o n 3, p a r a g r a p h 3.2.1. p r e v e n t a n y l o n g i t u d i n a l , v e r t i c a l , o r l a t e r a l m o v e m e n t .
M e t a l b a n d - i n g , o r w i r e , of s u ff i c i e n t s i z e o r s p e c t e d a s s p e c i f i e d i n s e c t i o n T h e t e s t i t e m s h a ll t h e n b c i n - 3, p a r a g r a p h 3.2.4. s t r e n g t h s h a ll b e used to provide additional tiedown strength. Posi- tions of the equipment with respect to the’test car and whetheror not packaging is necessary shall be specified in the equipment specifica- tion. 3.8 P r oc e d u r e V I . R a il i m p a c t t e s t .
T h i s t e s t i s p e r fo r m e d t o d e t e r m i n e t h e e ff e c t t h a t i m p a c t , d u e t o s h i pp i n g a n d o t h e r t y p e s of t r a n s p o r t a t i o n , w ill h a v e o n e q u i p m e n t . I f a n i t e m c a n b e s h i pp e d i n t w o o r i e n t a t i o n s , i t s h a ll b e i m p a c t e d o n c e i n e a c h d i r e c t i o n of (c) e a c h o r i e n t a t i o n a t s p ee d s of 8, 9, a n d 10 m il e s p e r h o u r ( t o t a l of 12 i m p a c t s ) . I f a n t e m c a n b e s h i pp e d only in o n e o r i e n t a t i o n , Impact the test car (flat) into the two loaded cars. ( d ) Impacts shall be made in progrc~- M E T H OD 516 516 - 4 \.. .. ( ,.
i .