By George C. Marshall Space Flight Center.; United States. National Aeronautics and Space Administration

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The elements ~ h i c hwere j e t t i s o n e d o r l o s t have inuch s h o r t e r l i f e t i m e s ; some had a l r e a d y e n t e r e d t h e atmosphere w i t h i n GO days. The f o u r s e c c i o n s o f t h e shrcud have e s t i m a t e d l i f e t i m e s v a r y i n g between 700 and 1000 days, and t h e p r e d i c t e d l i f e t i m e of t h e l o s t s o l a r wing i s 1500 day;. 9 MISSION OPERATIONS SUPPORT The Skylab mission w a s c o n t r o l l e d from t h e Johnson Space Center w i t h Y a r s h a l l Space F l i g h t Center p r o v i d i n g t e c h n i c a l support on system2 and zxperiments f o r which i t had development r e s p o n s i b i l i t y .

On Day 191 t h e coolant loop f o r t h e s o l a r observatory c o n t r o l and d i s p l a y panel and Earth observation equipment e x h i b i t e d e r r a t i c flowrates. Contamination was suspected, and on Day 219 t h e coolant loop f i l t e r was r e p L c e d with a s p a r e liquid-gas s e p a r a t o r . There was some contamination and gas, which t h e s e p a r a t o r removed. New f i l t e r s were i n s t a l l e d and t h e loop's f l o w r a t e returned t o normal. On Day 194 c o n t r o l gyro 1 s p i n motor c u r r e n t showed a r a p i d rise, i n d i c a t i n g Motor c u r r e n t s increased from 1 t o 2 amperes.

1I N --2- . I f . I . . -. - + -/ 1 I - --I % - - - I . - %- cn z m h m ,-. r oI ? Figure 3-21. 2 m t. m OD t. m m I . m 0 OD m 7 m m 7 hl m d m m m OD 7 Time, year - S a t u r n Workshop p r e d i c t e d o r b i t a l decay. The elements ~ h i c hwere j e t t i s o n e d o r l o s t have inuch s h o r t e r l i f e t i m e s ; some had a l r e a d y e n t e r e d t h e atmosphere w i t h i n GO days. The f o u r s e c c i o n s o f t h e shrcud have e s t i m a t e d l i f e t i m e s v a r y i n g between 700 and 1000 days, and t h e p r e d i c t e d l i f e t i m e of t h e l o s t s o l a r wing i s 1500 day;.

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