STS-41C National Space Transportation Systems Program Mission Report

8/7/2019 STS-41C National Space Transportation Systems Program Mission Report

1/17

JSC-1

%&llIOBBL SPBCE ~ e 5 - 2 3 9 0 0S F I c C G F A f ! ClISSIQElEEPOBT ( I O S B ) 18 p HC Au i I f l F A131 CSCL 22A Un c l a s63/16 15290

Nationa!Aeronautics andSwceAdministrationLHouston,Texas

GLEY RESGf7CI-lCENTERUBRARY, NASAWel'OM,VIRGINIS


2/17

JSC-196

S T S 41-CN A T I O N A L S P A C E T R A ~ S P O R T A T I O NSYSTEMS PROGRAM

MISSION REPORT

Manager, Shuttle Data and Evaluat ion Off ice

NBT


3/17


4/17

INTRODUCT!ON AND flISSIOM OBJECTIVESThe STS 41-C Ha tio na l Space Tran spo rtat io n Systems Program Miss ion Report conta ins asuimnary o f t h e m a j or a c t i v i t i e s a n d a c c o v l i s h m n t s o f t h e e le v e n th S h u t t l e f l i g h t a ndf i f t h f l i g h t o f t h e OV-099 veh ic le , Cha l lenwr . This r epo r t a lF3 s ummar i z es the s i gn i f i -can t p rob lems tha t occur red dur ing STS 4 1 4 , en d p r o vi d e s a p ro bl em t r a c k i n g l i s t t h a t i sa com plete l i s t o f a l l p rob lems th a t occur red du r ing th e f l ig h t . None o f the prob lemsw i l l a f f e c t t h e L T S 41-0 f l f g h t .The ma jo r ob jec t i v e s of f l i g h t ST S 41-C were t o su cce ss fu l ly dep loy th e LOEF ( longd u r a t i o n ex po su re f a c i l i t y ) a nd r e t r i e v e , r e p a i r and r ed e p lo y t h e SWW (So la r FlaxitrumMiss lon) spacecra f t , and per fo rm func t ion s o f M A X and Cinema 36 0 camrds.The sequence o f e v e nt s f o r t h i s f l i g h t i s shown i n t a b l e I . The p ro bl em t r a c k i n g l i s t sf o r t h e NSFC (Marsha l l Space F l i g h t Center) e lements and Orb i te r a re shown i n tab les 11and 111, r e s p e c t i v e l y , a l s o a t t h e e nd o f t h e r e p o rt .

M I S S I O N SUHWRYThe STS 4 1 4 f l i g h t was launched from Launch Comalex 39 a t KS C [Kennedy Space Center) onA p r i l 6, 1984, a t 097:13:57:59.999 6.m.t. (08:57:59.999 e.s.t.), and land ed a t t h e EdwardsAFB ( A i r Force Base) a t 05:38:07 P.s.t. on A p r i l 13, 1984. This f l i g h t was schedu led as a6-day mission, but SM r e t r i e v a l p ro ble ms d u r i n g f l i g h t day 3 ope r a t i ons r es u l ted i n ex-t e n d i n g t h e m i s s io n 1 day fo r a t o t a l o f 7 days. A lso, t h i s f l i g h t was schedu led t o landa t the Kennedy Space Center Sh ut t le Land ing F ac i l i t y ; however, th e po ss ib i l i t y o f adversewea the r ( r a i n ) r es u l ted i n a dec i s ion t o land a t Edwards AFB, Ca l i fo rn ia .The crew f o r t h i s f l i g h t was Capt. R o be rt L. C rfp pe n, C o ~ a ~ d @ r ;Jor Frances A. Scobee,P i l o t ; and Te r r y J. Wart, Jams D. Wan Hoften, PhO., and George D. Nelson , PhD., Mis s ianSpec ia l is ts . O f t h e 25 D T O * s ~ d ~ ~ ~ ~ o ~ ~ ~ tt e s t objectfwes) and DSQ'; ( de t a i l ad s upp le -mentary ob jec t ives ) , a11 w e c m p l e t e d P ar a 10O-p~rcentc m ! l e t i o n r a t e .The ascent phase was nominal i n a l l respects, as was the S Rl l ( s o l i d r oc k e t boos te r ) andt h e ET ( ex te r na l tank ) separiatSan and the %IS ( o r b i t a l ~ r ~ e u y ~ ~ i n gsystem) maneuver thatp l ac e d t h e v e h i c l e i n the p lanned 252- by 137-nsnl. e l l l i p t i c a l orb i t , The SRfr's wererecovered along w i t h t h e i r parachutes, a ~ t h ~ g hone maln pa r ac hu te d i d no t open fully.The ET iPpec ted w i t h i n t he p lanned foo tpr in t .The f i r s t d ay o f t h e STS 41 -C f l i g h t p ro g re ss ed s a t i s f a c t o r i l y . The m ost s i g n i f i c a n t o fthe anomal ies t ha t occur red was th e fa i l u r e o f t h e MDM (multiplexer/demultiplexer) d u r i n gp re launch ope r at ions. Th i s un i t was r ep lac ed p r i o r t o launc h and ope ra ted s a t i s fa c t o r i l yth roughout t he mission. Also, t h e GGVM (gas genera tor valve module) temperature on a l lt h r ee APU's ( au x i l i a r y p w e r un i t s ) showed a s ho r t d u r a t i o n d rop i n temperature dlr r ingascent. The f i r s t maneuver o f th e rendezvous sequence (MC-1 ph as ing maneuver) was suc-c e s s f u l l y pe r for med about 5 hours in t o th e f l f nh t . The op t ion a l p lane change maneuverwas no t requ ired. The DTO co nc er nin g ET t r a c k i n g from Hawaii was a ls o completed.( r em te man ipu la to r sys tem) and th e LDEF sys tems were a l so checked ou t d ur in g the f i r s tday.E a r l y on t h e second day, two rendezvous maneuvers (Mil and NSR co e l l ip t i c ) sche iu led fo rt h a t day were completed. The second maneuver pla ced th e O rb it e r i n a 259- by 256-nmi.or bi t . The LDEF ac t i va t l on i n pre para t ion fo r dep loyment was f n i t ia t e d about 24 hoursfn to the f l i gh t . Du r lng the fa l l ow l f i g 4 hou rs , two AHS/LDC,; DfO'a were accomplished andth e LDEF was rele ase d a t 096:17:19:27 G arne t .

The RMS

1


5/17

TABLE I . - STS 41-c SEQUENCE OF EVENTSr

EVENTAP U a c t i v a t i o n 1)12,i 3 jSRB HPU ac t iv a t io n c o m n d (RH-B2)M PS s t a r t conanand sequence ( en gin e 3)SRB igni t ion command from GPC ( l i f t - o f f )MPS t h r o t t l edo wn t o 67 pe r cen t th r u s t ( eng ine 3 )Haxfmum dynamic pressureMPS t k r o t t l e u p t o 1 0 4- pe rc en t t h r u s t ( en gi ne 3)SR B s eoa r a t ion cMPS t h r o t t l edo wn fo r 39 ac c e le r a t i on ( eng ine 3 )Ma in engine c u t o f f (MECO)Externa l tank separa t ionAPU deactivat ion (APU 3)OHS-2 f g n l t i o n f t

Long d u r a t i o n e xp osu re f a c l l i t y (LDEF) deployS t a r t f i r s t e x t r a ve h i cu l a r a c t i v l t yEnd f i r s t e x t ra v e h ic u l a r a c t f v i t ySPCM observa tory grappleS t a r t secon d e x t r a v e h i c u l a r a c t i v i t yE nd s ec ond ex t r av eh i c u la r ac t f v f t yS f M ohserva tory re leaseOPS-8 ( f l i g h t c o n t r o l s y s tAPU-1 act ivat ionD e o r b i t ~ n ~ u v e ri g n l t l o nDeorbi t maneuver cutoffAPU-2 and -3 a c ti v a ti o nEntry in te r face (400,000 f t )End b1a ckoutTerminal area energy ~ n ~ ~ @ ~ n ~Mafn la nd in g gear contac tNose l and ing gear contac tWheals stopAPU de ac tiv at io n camplete

OMS-2 C u t o f f

Note:

ActualG.m.t.097:13:53: 07097:13: 53:08097: 13:57: 32.8097: 13: 5 7: 53.4097:13: 57: 59.99909 7:13:58:25.8097:13:58: 50.5097: 13:58: 57.6097: 14:00:06097: 14:05: 30.4097: 14 : G o : 3 1.2097:14:06:49.3097: 14: 10: 11097:14:40:54.1097: 14:42:29.3098:17:19:27099:14:18099: 17: 1510 1:13: 52:20102:08: 58102: 15: 14103: 09:26:29103:13:53:29104: 12: 24:33104: 12:29:30.3104:12:33:32.5104:12:54:58P04:13:07:51.6104:13:24:12104:13:Jl: 54.5104: 13: 38:Ol104:13:38:23104:13:38:55104:13:51:16

_ _ _ S- 1 maneuver was no t p lanned o r made on t h i s f l i g h t b eca use o f t h e d i r e c t a s ce ntt r a j e c t o r y.

2


6/17

On th e second day, t h e cab in pressu re was 1 r ed t o 10.2 p s i a i n p r ep a ra ti on f o r t h e EV A( e x t r a v e h i c u la r a c t i v i t y ) t h a t was t o be co c t e d f o l l o w i n g SNt4 rendezvous on day 3.However, because o f a pro cedura l e rr o r i n t h e p r e b r ea t h i n g p r o t o c o l w i t h t h e s u i t , t h ec ab fn was r ep r es s u r i z ed and dep res s u ri z ed aga in t o the 10 .2 -psia l ev e l t o Ins u r e th a t ther equ i r ed p r eb r ea th ing was accompl ished pr io r t o t h e EVA. A l l subsystems i n th e cab in a reafunc t i oned s a t i s f a c t o r i l y du r i ng the extended pe r i od o f l ower p ress ur e.Fo l low ing rendezv , two of th e Mis sion S pe ci al is ts (Nelson and Wan Hofte n)on, ber th ing , and re pa i r opera t ions . The t r an s l a t io n t oneuver ing u n i t ) was exce l le n t ; however, a l l a t tempts a tSMM were unsuccessful because th e jaws o f t he YPAD ( t ru n n i o n p i n a t t a c h -ment dev ice) wou ld no t re lease and so f tdoc i w i th the SHM tr un n io n pin. The crew memberthen he ld on t o a s o l a r wi ng i n an a tt e m p t t o s lo w v e h i c l e r o t a t i o n so t h a t t h e SMM c ou ldbe grappled, but t h i s procedure was al so unsuccessful. A t t h i s t i n e t he EV A was termi-nated.Fo l l ow ing EV A termin at ion, attempts were made t o grapple the S w i t h t h e RNS. These werea l s o unsucc es sful . A t temp ts to r e t r i e v e the s a te l l i t e were t e i na ted and an Or b i te r sep -ar a t io n maneuver was per fo rmed t o a l low the WH s p a ce c ra f t t o s t a b i l i z e .The fo u r t h day was a repl ann lng day fo r th e re-rendezvous and recovery o f t he S14fl. Plan-n i n g d u ri n g t h i s f o u r t h day a l s inc lud ed a one-day ex tens ion t o th e miss ion , i f t h esecond a t tempt t o capture th e S was suc ces sful . Because o f he ex tensi v e s ta t i on k eep-i n g and maneuver ing per formed i a tt em p ti ng t o r e t r i e v e t h e S , the fo rward RC S ( r e a c t i o ncontro l system) had only 22 pe r cen t p r ope l l an t r ema in ing a f te r the f i r s t r endezv ous ac t i v -i ty. As a r es u l t , t he r e -r endez vous was de lay ed u n t i l t h e f i f t h day because the p r ope l l an tusage wou ld be s i g n i f i c an t l y less s ince the SMP-4 would be i n a more advantageous or b i t a lp o s i t i o n w i t h r es pe c t t o t h e O r b lt e r.Ea r ly on the f i f t h day, th e rendezvous mneuwers were begun. A minimum amount o f pr op el-l a n t was used t o r eac h the s ta t i o n k eep fng pos i t to n f ~ mwhere g r a p ~ ? ~ ~ $cou ld begfn wl tht h e RHS. T h e f i r s t grapple a t t eq t was. s u cc e ss fu l i n c a p t u r i n g th e S!&4, a f t e r &'RICE\ t h espacecra f t was p la ca d i n t h e FSS (P l fght s e r v i c e s ys tem) i n the cargo bay.l oc ke d i n p l d c e f o r t h e r e p a i r s t h a t w ere t o be conducted cn t h e s i x t h day.The EV A on t h e s i x t h day was s u cc es sf ul w i t h t h e crew c o q l e t i n g a l l r e p a i r a c t i v i t i e s i nl es s than 4 hours.Mis s io n Sp ec la l is t Van Hoften was given permlss lon t o conduct a per fo rmance eva lua t ion o fthe second MHU.6 hours 16 minutes. Using th e RMS, t h e SMSS s a t e l l i t e was l i f t e d fro m t h e FSS f i x t u r e a n dheld above the cargo bay so t h a t F more complete checkout could be cotqleted.t h e s a t e l l i t e showed t h a t t h e r e p a i r s h ad been s u cc es sf u l i n r e s t o r i n g t h e SMt4 t o f u l lopera t ion.O r l g i n a l p l a n n in g f o r t h i s m i s si o n i n c lu d e d a r e bo o st o f t h e SN M o r b i t t o about 285 nmi.c i r c u l a r .t h e e xt en de d s a t a l l l t e n l s s i o n l i f e %as n o t a h i g h p r i o r i t y i te m , t h e r eb o os t was c a n ce l-jed. As a r e s u l t , t h e SWM i s ope r a t i ng i n abou t a 270-nmi. c i r c u l a r o r b i t .Upon release of the St4N I n i t s p l an ne d a tt i t u d e , , t h e S h u t t l e re ma in ed n ea rb y u n t i l thso v e r a l l c o n d i t l o n of t h e S f M could be determined by Goddard Space Flfght Center engineers.A f t e r t h e more ex tens ive t e s t showed the SW t o b e o p @ r a t in gproper ly , the SS8.I was re-leased, the Or b f t e r separa ted from t h e SW and f i n a l s towage fo r e nt ry was begun.

The SW Has

Because o f th e shor te r - than-p lanned t ime requ i re d fo r SMM r epa i r ,A success fu l eva lua t lon was completed and the EVA was completed i n

Tes ts o f

Hwever. s in ce O rb i te r prop el l an t was becornlng a c r i t i c a l consumable, and s ince

3


7/17

Al l prepara t ions f o r en t r y were comple ted and the c rew was maklng f i n a l p repara t ion s f o rthe deorbl t maneuver when the ground contro l lers made a d e c i si o n t o d e la y e n t r y o ne o r b i tbecause o f un sa t is f ac tor y weather that was headed tw a r d the S hu t t l e Land ing F a c i l i t ya rea a t KSC. F u r t h e r w e8 th er e v a l u at i on s l e a d t o t h e d e c i s i o n t o l a n d a t Ewhere th e weather was id ea l.The descent was f low n as planned wi th only one P T I ( p ro g r a m e d t e s t i n p u t ) n o t b e i n gpe r fo r wd . Th i s was expected based on the t r a j ec to r y f l own f o r entry and l and ing a tEdwards AFB. A l l other aspec ts o f en t ry were as lanned and a f t e r a 249-degree headingal ignm ent c i r c l e maneuver, th e O rb i t er touched d n a t 104:13:38:07 G.m.t . on lakebedrunway 17.

RENDEZVOUSFIRST RENDEZVOUS

The f i r s t s t a r t r a c k e r nav iga t i on pas s began a t a r ange o f appr oxima te ly 105 nmi. andended a t about 88 nmi. The ta r ge t was br i gh t enough t o be seen v i su a l ly e ar ly i n th epass and could be seen i n t h e COAS (crewman op t ic a l a l ignment s i gh t ) a t about 100 nmi.The two ground-computed maneuvers (NC, NH) were executed w i th smal l res idua ls .s t a r t r ac ke r pass ranged f rom 53 t o 48 nmi. The s t a r t r a c k e r i n i t f a l l y l o c ke d o n t o a= tar .t h e t a r g e t s u c ce s s fu l ly .s t a r t r ac k e r . P o s t f l i gh t da ta ana l y s i s showed th a t th e s ou rc e o f t h e no i s e was no t th es t a r t r a c k e r as o r i g i n a l l y s us pected . The t r a c k f ng anoma li es were c o r r e la ted t o t h e 1MU( i ne r t i a l meas u r emen t un i t ) RM (redundancy managerrent) software. The radar acq ufre d t h et a rg e t p r i o r t o T I ( te r m in a l i n i t i a t i o n ) a t a range o f 17 nmi.Because o f t he abnormal s ta r t r ack er bchav lisr no ted dur tn q th e seeand s t a r t r a c k er pass,r a d a r an gl es w ere i n c or p o ra t e d i n s t e a d o f s t a r t r a c k e r an gl es f o r t h e p o st - T I n a v ~ g a t i o ni n t e r v a l .s u c c e s s f u l l y f lo w n m a n ua ll y f o l l m t i n g t h e MC4 maneuver t o w i th in 200 P t o f t h e t a r g e t ands t a t i o n k e e p i n g was i n i t i a t e d .

SECOND RENDEZVOUSThe f t r s t g roun d-coquted maneuver (WC) for the second rendezvous was executed a t a rangeo f 54 nmi.The f i r s t s t a r t r a c k e r p ass o c cu r re d a f t e r t h e WC maneuver a t a range between 56 and53 nmf,were c o ns i s t en t l y l es s than 200 ft . throughout the per iod.norma1.

The secondDur ing t h i s t r ac k ing pe r i od , no i s y behav io r was no ted w i th i n th eThe crew r ec ogn i zed th i s s i tua t i on , b r ok e l oc k and then the s t a r t r ac k e r t r ac k ed

A l l E9C (!rbfdCOMf'Se corrections) w@re small as exp@cted. The rendezwaus was

The second st a r tra ck er pass began on th e next revo lut ion . The pos i t ion updatesStar t racker behav io r wasThe NCC maneuver so lu t io ns were computed before, dur ing, and a f t e r the second s t a r tra ck erpass. A l l s o l u t i o n s a g re ed w i t h i n m i s s io n l i m i t s an d t h e f i n a l NCC maneuver so lu t i on wasexecuted.The ra dar locked on a t about 18 nml.Manual procedures began af t e r th e MC4 maneuver and ta rg et s ta t i o n keeping was su cc es sfu l lyachieved.

All midcourse corrections were small as expected.

4


8/17

. .Two per iod s o f EVA were pla nt o c a pt ur e a nd s t a b l i z e t h eas planned and the EV AThe donn ing o f the s ta r boa rgressed as planned.a l t e r n a t e p rocedu re , the c rs t a b i l i z e t h e SM#.dec fs ion was made tth e s ta rboa rd -s ideA f t e r t h e s u cc e ss f ul r e t r i e v a l and b e r t h i n g o f t h es o l i d i f i e d ,a t 102:08:58, over an hour ahead o f Schedule.r e p a ir a c t i v i t y was completed, and th e crew was gfv en pefor manc e ev a lua t i on i n the c ar go bay, u s ln g t h e p o r t - s i dB e fo r e depa r t i ng the 5equipment, using a t a po p e r a t e d s a t i s f a c t o r i ly.The por t -s ide #MU operatedex pe r ienced i n doc k ing th e

1-C. The f i r s t EV A was planneda t l m s f o r t h i s f i r s t EVA wentr s a t a h t 099:14:18 G.m.t.s p a ce c ra f t a l l p r o -

de numrous unsuccessful attempts and as anThe f i r s t EVA l a s t e d 2 hours and 57 minutes, and

The docking sequence was initiated, b u t t h e TPAO w ould n o t f i r e t ot r unn ion p i c . The c reminate the EVA,T h fs a c t i o n i nc re a s ed t h e i n s t a b i l i t ywas flown f o r 42 mi i tu tes du r i ng th i s EWA.

p lans fo r the second EV A werend t h e crew e x i t e d t h e a i r l o c kThe crew preparations proceeded smoothThe c rew proceeded d f r ec t l y t o th e SW,n t o c onduc t an MFIU pe r -t r unn ion p i n and ad jacen td u r in g t h e r e p a i r a c t i v i t y

r i n g a11 te st s; however, some d i f f i c u l t y wasage stat ion. The por t-s ide f 4MU was f lown fo res dur ing the second EVA. The overal l per formance of the MHU's du r i ng bo th E V A ' Sless.n t on t h e SIB4 and ent ere d th e air loc k. The second EV A l a s t e d 6 hours 16 minutes.A f t e r t h e &MU e v a l u a t i o n was c o ~ ~ l e t @ d ~the crew removed a cover from an

PAY LOAQSL o H e ~~~~7~~~~EXPOSURE FACILITY

The LDEF ( l o n g d u r a t i o n e xp os ure f a c f l i t y ] c o n t a i n s 57 individual science and technologyexperiments, i s a p p r o x i ~ t e ~ y14 ft i n d i ame te r and 30 f t Isr?g, and weighs approximately8000 lb. The LDEF was success fu l ly dep loyed on STS 1 be r e t r i e v e d f r o m i t sg r a v it y - g ra d f e n t s t a b i l i z e d a t t f t u d e on a f u t u r e ShuThe L D E F unb erth ing and deployment o perat ion s on day 2 nt as planned.deployed on t im e and th e crew re por ted no observable ra tes a t deployment. A p r e l i m i n a r yf i l m rev iew shows that the LDEF ra te s a t d @ p l o y ~ n tw e r e a t l e a s t Q t imes l es s than themaximum allowable rate o f 0.025 deglsec. A ft er deployment, th e Or bi t er sep arat ion man-euver was i n i t i a te d and the c rew con f ir med th e s epa r at i on r a te w i th t he r ada r. The crewa l s o r e p o r t e d t h a t t h e vie w o f the t r unn ion p in s and be r th ing gu ides us ing the CCTV( cl os ed c i r c u i t t e l e v is t o n ) system was not sa t is fac tory , and they expressed some concernabou t the us e o f the CCTV sys tem dur tng the fo r thcoming LDEF r e t r l ev a l m is s ion .

The LOEF was

The Cinema 3 6 0 c w er a s ys tem wa s f l own i n the pay load bay and th e IHAX camera i n the c rewt a m r a was ope ra ted by the c rew i n the O r b i te r c ab in . The system ha d (Ii n te rchangeab le lenses and n i n e 1000- f t f i l m mgaz lnes ,ope r a t i ng th e cdmera o r i n c hang ing f i l m magazines o r lenses.The Crew h i id no d i f f i cu l tyA l l f i l m was exposed and

5


9/17

t h e u s e r r e p o r t e d t h a t 75 t o 80 percent O f t h e f i l m was studio usable. The crew experi-i f f i c u l t y w i t h t h e v oi ce r e co r d er t h a t tias used I n c on j u nc t io n w i t hem a b l e t o r e p a i r t h e r ec or de r.The paylo ad bay camera was an A r r i f l e x 3 h camera which used a 1000- f tmounted i n a ~ d i f i e dGAS ( g e t a ~ ~spe c ia l ) can is te r . The mo d i f ied GASprecis ion-machined l i d tha t housed a qua r tz de l e c t r o n i c s t h a t a 1 1 0 d th e crew t o remotely change f-s top, frame rate , olus ope r a ta th ecamera.operat ions.a l l f i l m was ex posed as planned .

f o r t h e f i s he y e l en s t o look through, andTh is camera was used t o capt ure foota ge o f E V A ' S , pa yloa d degloymernt, and RHSThe camera was c on tr o l le d wi th th e APC (autonornus pay load co nt ro l le r ) andThe user was extremely p leased with the resul ts .

BE E EXPERIMENTA student-sponsored bee experiment was successfully flown.bee d i s o r i e n t a t i o n d u r i n g t h e f i r s t o r b i t a l day; however, th e bees then se tt le d and werea b le t o walk, f ly, and f l o a t w i t h n o ap p ar en t d l f f i c u l t y . A s i m i l a r p e r i o d o f d i s o ri e n -t a t i o n was a l so observed a f t e r en try.The bees b u i l t approx imate ly 30 i n z of honeycomb wh i le on o r b i t and th e queen bee l a i dapproximately 35 eggs.the same as would be produced under one-g conditions.p o p u l a t io n ) d i e d d u r i n g t h e f l i g h t a nd t h a t i s l e s s t h a n exp ec te d.The bees apparently worked wel l under zero-g condi t ions and f i l m s show that they a r e ab let o f l y f a s t e r I n t h e w e f gh t le s s c o n di ti o n.t lnuing.

The crew observed some i n i t i a l

The i n i t i a l ins pe cti on showed t h a t t he honeycomb was normal; i.e.,Only 120 bees ( 3 1 /2 pe r c en t o f the

Fu r the r ana l y s i s by the ex pe r imen ter i s c on -

VEH ICbE ~~~~~~~~TSOLID ROCKET BOOSTERS

The SR5 a f t s k i r t shoe s hlm m at@ r Ia lon t h e south pos ts remained i n tac t ; hwev e r p then o r t h p o s t shims were miss'lng and eroded by t h e 'flaw i ~ i ~ g ~ ~ n t .been observed on prev ious f l igh ts .The performance o f t h e SWNl's ( s o l i d r oc k e t mt o r s ) was nea r p r ed i c te d l ev e l s and we l lw i t h i n t h e s p e c t f i ca t f o n l i m i t s . Q u ic k- lo ok @ v a l ~ a t ~ o mshows that head pressures andp r o p e l l a n t b u rn r a t e s w ere s l i g h t l y g r e d t e r th a n p r e d i c t e d f o r b o th motors.t i o n t lm e f o r t h e SRB's was a ~ p r o x ~ ~ t e l y1.4 seconds e a r l i e r than predic te d.o f b o t h SR5 TY C ( th r us t v ec to r c on t r o l ) sys tems was s a t l s fac to r y and no a n m l f e s wer eexperienced.ascent phase.The left-hand SRB range safety system channel A s fgna l s t r eng th d r opped t o 1 v o l t a tl i f t - o f f p l us 1 minute 15 seconds for 5 seconds and then r e tu r ned t o s a t u r a t i o n f o r th eremainder of' t h e f l i g h t , An i n v es t fga t fon i s u fi de rway t o de te r m ine i f t h i s c o n d i t t o n fspa r t i n th e measuring system or t o th e range sa fe ty sys tem hardware.Chase plane video and photogrephic coverage shodled that one main pa r ac hu te on th e r i g h t -hand SR B failed t o f n f l a te and ind i c a te d no rma l pa rac hu tes on the l e f t - ha nd SRB.pa rac hu tes we re r ec ove r ed and the po s t f l l g h t i ns pec t i on r ev ea led the fo l l ow ing :hand m i n pa r achu te s e r fa l number 4030 f a i l e d i n g ore 47 f r o m h o r i z o n t a l rfbban 24through t he vent band; left -ha nd drogue pWfxhMte se r f a l number 3006 severe ly dsinaged i n

Th is cond i t ion has

The separa-Operat ionThrust fmbalance between the SRB's #as w i t h i n s p e c i f i c a t i o n th ro u gh o ut t h e

Allr i g h t -


10/17

gore 49 and o th er sur round ing ma ter ia l , apparent ly f rom SRH ho t p r ope l l an t deb r i s ; andl e f t - h a n d main pa rac hu te s e r i a l number 4027 fa i l e d a l l ho r i z on ta l r fbbons I n gore 18(s k i r t band, vent band in ta c t ) . An i nv es t iga t io n team has been es tab l lshed t o de terminet h e c a i s e o f t h es e an l i e s . F l as h fn g l i g h t s and RF beacons per4 0 d norm ally. Table I 1conta ins a cur r en t anomaly l i s t f o r th e SRB's.EXTERNAL TANK

The ET performance was excellent.th e prim ary 100-percent number 1 l e v e l sensor ~ a s u r e ~ n tc i r c u i t e rr on e ou s ly i n d i c a t e dwet. The measurement in d ic a te d w @ t f o r 36 minutes and then re tu rned t o a d ry s ta te .measurement op er at io n was normal throug hout t h e remainder o f t he loading.A l l prelaunch requirements were met w i t h no LCC ( launch commit c r i t e r i a ) v io l at ion s.separa t ion and en try were as predic ted, tumble was co nf if o o t p r i n t . The e n t r y o f t h e ET could be seen from HawaiThe pre lau nch therm al e nviro nm ent was as expected.ex per ienc ed on l y m ino r f c e / f r o s t bu i l dup i n ar eas th a t had app roved wa fv er s p r i o r t of l i g h t .

Dur ing l iqu id hydrogen reduced f l c w p r i o r t o tu pp fn g,TheETd, and impact was w it h in th e

The TPS ( t h e m 1 pro t ec t io n sys tem)

SPACE SHUTTLE M A I N E ~ G I ~ E ~ A I NPROPULSION SYSTEMA l l pre launch countdown and mains tage m i n eng ine f l i g h t da ta looked very good.pressure ox id izer and fuel turbo-pump turbine discharge temperatures compared favorablyw i t h p r ed i c te d v alues .appeared t o be normal.dur ing mains tage appeared sa t is fac to ry ,Ov e r a l l asc en t p e r f o m nc e wasabout 67 percent compared to the predfcked 71 percent.leve l ind ica tes h igRer - than-gredtc teQ SR B i mp uls e d el i ve r e d d u r in g t h e f i r s t 20 seconds o ff l i g h t . *Engine op era tf on and p @ r f o ~ n c @dur ing m if is tag e appeared sa t is fa c to ry .s tate per formance, ET/ORB, ( O rb i te r ) pr es su re s and t e ~ e F a t u r ~ sand ORB/SSPiE pressures andtempera tur es s a t i s f i e d i n t e r f ac e r equi remen ts . Qu i ck - look m ix tu r e r a t i o and th r u s t v a luesfrom t he f l i gh t i nd i c a te r epea tab le eng ine pe r fo r manc e .The l l q u id hyd rogen & pe rc en t l i q u id - l e v e l s enso r t r i pp ed a t abou t WECO (mafn enginec u to f f ) , and the l fq u id oxy gen eng fne c u t o f f s ens or s t r fpped I S expected. A v e l o c i t yc u t o f f was achieved. MECO occur red a t approx imate ly 51 1 seconds Coinpdfed t o a p re di ct edtine o f 510 seconds.Table I1 conta fns a cur re n t l i s t i n g o f anomal les th a t occur red w l th jn t he SSME/#PS (mainpr op ul sio n system) subsystems.

ORB ITER

The hfgh-SSME (Space Shut t le Ma in Eng ine) s ta r t , cu to f f and prop e l lan t dumpNo problems were encountered throughout the Fl ight. Performance

b r i n g m x 7,t h e s E's throttled dw n t oThe lower han-pradi c te d t h r o t t l e

Dur ing steady-

The overa l l per fo rmance o f the Orb i te r was sa t is fac tory . A b r i e fn i f i c a n t a no ma lie s i s c o n ta i ne d i n t h e f o l l o w i n g p ar ag ra ph s* A cO r b i t e r f l i g h t a n o m a l i e s is c o nt ai ne d I n t a b l e 111.s c us s ion o f the s4g-l e ea l i s t o f t h e

F9DH FF l Card 5 Fa3lup.e-During STS 41-G prelau nch checkolrt, c ar d 5 o f iWf~!F F l f a i l e d ,replaced, and a l l assoc ia ted fun c t io ns were rev er i f ie d o r waived. The rep lacement MDMexhibi ted normal per formance throughout the miss ion.

The HLIpE.9

7


11/17

Ku-Band Rendezvous Radar Failed Self-Test and Lost LockDur ing on-orb i t opera tions, t h e Ku-band rendezvous rad ar experienced spo radi c AGC (auto-en these tond i t ions were present (e igh t

after los ing lock because of antenna obscurat ion and subsequent power ingThe o ve ra l l per formance o f t he Ku-bandi n c o n t r o l ) s p i k i n g a nd f a l s e d e te ct s.the r ada r fa i l ed the s e l f - t es t ; and, on one oc casjon , th e Ku-band fa i l ed t o r e -

down o f t h e WA ( travel ing wave tube assembly) .fo r t h i s miss ion , however. was acceptable.Unsuccessful Soft Docking Attempts With SW S a t e l l i t e

The EV ( ex t r av eh i c u la r ) -1 crewman made thre e unsuccessful attempts t o s o f t dock wi th th eSMM s a t e l l i t e t r u n nl on p in .t h e TPAD design envelope.t r u n n i o n p l n i n an e l a s t i c re bo un d.t r a n s l a t i o n syste m t o h o l d t h e TPAD on the Sback response.doc king w f th the t r un n ion p in .SI%! ope r a ti ons , th e t r i g ge r r i n g was depress ed w i t h a te t he r hook and the TPAD f i r e d b o tht imes.A l / C in c h d iameter by 3 /4 - inch h igh grommet th a t h e ld the thermal b la nke t on th e SI(IMs t ru c tu re was lo ca te d near the t run n ion p in.m e n t s a n d l o c a t e d t h e i n s u l a t i o n g r o i m t 1 i n c h from t h e t r u n n i o n p i n w i t h t h e h e ad o f t h e

At t i t ude , ang les, and rd te s dur ing c losure were well w i t h i ni r d a tt em p t, t h e EV-1 cret run n ion p in , thus prevet ac t i v a te and r e leas e the j aws fo r s o f tbdh ile i n th e pay load bay , bo th before and a f te r th e MPIU

On t h e f i r s t two a tt em p ts , t h e TPAD bauncedOn t h eHowever, the t r i g ge r i n g d id

Dur ing th e second EVA, the crew took measure-and 9/16 i n ches i n fr om the ou ts l de end o f the t r unn ion p in . The TPAD r equ i r est e l y 3 inches o f t r u nn i o n p i n p e n e t r a ti o n t o r e le a s e t h e t r i g g e r r i ng .

The was te co l lec t ion sys tem (UGS] fan separator number 1 ~ ~ [ ~ ~law a i r flo M.crew switched t o fa n separa tor number 2 which o p ~ r ~ ~ ~ dno r ma l l y f a r a shor t t ime and thenfa i l ed , Fan separa tor n u ~ b ~ r1 was reselected.Subsequent cyc l ing o f t h e MCS c o n t r o l l e r dc c f r c u i t b r e a k e r to f fan sepa rato r number 2. The mis sion was completed us in g f

Brake Fa i lu res

The

orarf ly r es to r ed useseparator number 1.

A f te r l and ing , th e b rakes e r e app l i ed a t 110 knots ground speed, The d e c e l e r a t i o nvar ied f rom 1 4 ~ 1 0 ~I t - l b CRHOB ( r ight-hand outboard) and LHKB ( le f t -hand inboard) ] t o16x106 and 1 7 ~ 1 0 ~f t - l b [LWOB ( le f t -hand ou tboard) and R:-IIB ( r ight-hand inboard) , respec-t i v e l y ] .Po s t f l ig h t inspec t ion , remova l and te ard wn o f the brakes reveawere damaged. The Ber y l l iu m was cracked on r o to rs 3 and 4 o f bbrakes and on rotor 4 o f t he LHOB brake. Carbon edges were c h iwere miss ing , d r iv e c l i p t a i l s were bent and carbon-sur face debt h e o u t e r t w o r o t o r s o r s t a t o r s o f a l l four brakes. Damage waswhich occurred can STS-7 except th at th e damage occurred on both

v a r i ed from 12 t o 6 f t / s ec 3 du r ln g th e 2142 fe et of b rak ing dis tance. Brake energy

e f t a nd r i g h t sldes.

~ e x t r ~ v e h i c u l a rm b f l i t y u n i t ) -1 s l sb l f m t or w ~ r e ~ ~ u r e - h ~ ~ ~mssage occur redd ur ln g t h e f i r s t EVA a f t e r t h e E Y - 1 c r @ ~ ~ ~ nhad een EVA for abou 45 minutes,the second EVA, t h e El l -1 crewman e x ~ e r i e ~ c e dnu rous pressure-hj messages and wa s a b l eb r i n g

8


12/17

t o l e a v e t h e c o o l i n g w at e r on fo r on ly about 1 minute before the temperature became toocold.hour be fore the tempera ture became to o hot. The EV-1 crewman was u n ab le t o m a i n t a i nproper tempera ture con tro l d ur in g the second EVA wi thou t tu r n i ng the c o o l i ng wa te r on ando f f about every hour.

A f t e r t u r n i n g the c oo l i ng wa te r off, t h e EV-1 Cr m m n was ab le t o wo rk f o r about an

9


13/17

PPaicn 9rn mdVI

h010ha*0

wd3=:2

Nd. .c1 -Y

10


14/17

e9

YEYt

v)cv,OIOI0r0xa

, IYYY

---e-

N

. - - - - -

r:.* xc..Q,mt-Q,c1..

11P


15/17

12


16/17

ta3W05

13


17/17

IItIIIIfII v )t f tI18IIIIII1ItIII1 -II .1 2

I

I :

14

Documents

STS-41C National Space Transportation Systems Program Mission Report