O-RINGS AND PUTTY

The short stack finally went together after repeated attempts, but one of the O-rings was cut. Efforts to separate the joint were stopped because some do not think they will work. Engineering is designing tools to separate the pieces. The prints should be released tomorrow. 2. The inert segments are at T-24 and are undergoing inspection. 3. The hot flow test rig i s in design, which is proving to be difficult. Engineering is planning release of these prints Wednesday or Thursday. 4. Various potential filler materials are on order s w h as carbon, graphite, quartz, and silica fiber braids; and different putties. They will all be tried in hot flow tests and full scale assembly tests. 5. The allegiance to the O-ring investigation task force is very limited to a group of engineers numbering 8-10. Our assigned people in manufacturing and quality have the desire, but are encumbered with other significant work. Others in manufacturing, quality, procurement who are not involved directly, but whose help we need, are generating plenty of resistance. We are creating more instructional paper than engineering I data. We wish we could get action by verbal request but such is not the case. This i s a red flag. . c-

¶A56

¶Ebeliiig R. V .

288

¶v-I l o r m m d EP25 (79-23) February 6, 1979

¶TO: O i s t r i bution

FROII: EPZHIR., R4y — 1

SUBJECT: Y l s i t to Precision R u b k r Products Corporation and hrlrer Seal Company t

The purpose of t h i s memorandum i s t o document the r e s u l t s o f a v l s i t

t o PreCiSlOn Rubber Products Corporation, Lebanon, TN. by Hr. Eudy. EESl and Rr. Ray. EP25. on February 1. 1979 and also t o inform you of the v i s i t nade to Parker Seal Company. Lexington. KY on February 2. 1979 by Rr. Ray.' Th. purpose of the v l s i t s was to present the O-ring seal manufacturers *1W data concerning t h e l a m O-ring extrusion gaps being experienced on . the Space Shuttle 50114 Rocket Motor c l e v i s j o i n t s and to seek opinions. mganting potential r i s k s involve+ Thc v i s i t on February 1. 1979. to Prao4sion Rubber Products Corporatlon by Rr. Eudy and Nr. Ray was very welt recelvcd. Conpany o f t l c l a l s , Mr. Hcuard G i l l e t t e . Vice President f o r Technlcal Direction, Mr. John Hoover, Vice President f o r Englnccring,and R r . Gene Hale. Design Engineer attended the meeting and were presented with the SRn c l e v i s j o i n t seal t e s t data by Mr. Eudy and Mr. Ray. A f t e r considerable discussion. capany representatives declined t o m k c IImnediate n c a n n n d a t i o n s because o f the need f o r more time t o study the data. They did; however. voice concern f o r the derign,stating t h a t the SRn O-ring extrusion gap was larger than t h a t covered by t h e i r experience. They a l s o stated t h a t more tests should be performed w i t h the present design. Hr. Hoover promised t3 C o n t i s t MSFC f o r further discusstons w i t h i n a f e w days. M r . G i l l c t t e provided Rr. Eudy and Rr. R a y with the names o f two consultants who my be able to help. Ne are indebted t o the Preclslon Rubber Products Corporation f o r the time and e f f o r t being'expended by t h e i r people I n support of t h i s problem. e m a l l y slncc they have no connection w i t h tbe project. ,

¶ilw v i s l t t o the Parker Seal Conpany on February 2. 1979. by R r . Ray, 0

EP25. was also wall received; Parker Seal Company SUpplieS the O-rings W d i n the S M c l e v i s j o i n t design. Parker representatives. Hr. B i l l n Collins. Vice President f o r Sales. Rr. N. B. Green. Ranagcr for Technical

¶Services. Mr. J . N. Kosty. Chief Oevelopnnt Engineer f o r RID. Rr. 0

P. Thalnm. T e r r i t o r y Ranrger and Rr. Obtch Haddock, Technical N

Services, met w i t h Hr. Ray, EP25. and w a n provlded w i t h the i d e n t i c a l — 0

P .( . . (

289

¶SIW clevis j o i n t data as was presented t o the Precision Rubber Products Company on February 1. 1979. Reaction t o the data by Parker o f f i c i a l s ws essentially the same as t h a t by Precision; the SRM 0 - r l n extrusion gap i s larger than they have previously experienced. They a!so expressed rurpi*lse t h a t the seal hdd performed so wet1 i n the present application. Parker experts would make no o f f l c i a l statements concerning r e l i a b i l i t y and potential r i s k factors associated w i t h the present design; however. t h e i r f i r s t thought was t h a t the O-ring ws being asked t o perform beyond I t s intended deslgn and t h a t a d i f f e r e n t type of seal should be considered. Th. need f o r additional t e s t i n g o f the present design ws also discussed and i t was agreed t h a t tests which more closely simulate actual conditions should b dona. Parker o f f i c i a l s w i l l study the data i n more d e t a i l w i t h other Company experts and contact MSFC f o r further discussions i n approximately one week. Parker Seal has shown a serious i n t e r e s t i n assisting MSFC wAth t h i s problem and t h e i r e f f o r t s are very much appreciated.

¶W i l l i a m L. Ray/ S o l i d b t o r Branch. EP25 Dlstribut1 on : SMl/Rssrs. Hardy/Rice EESl/Mr. Eudy EPOl/Mr. HcCool

290

¶V-J

¶Interolllce Memo :

¶This poaition l a now drasrically chansed aa a result of the SRn 16A nozzle j o i n t erosion w h i c h eroded a secondary 0-Bing w i t h the primary +Ring never sealing.

¶If th; same scenario should occur in a f i e l d j o i n t (and i t could), then i.t is a jump bJ1 aa t o t h e aucceaa or failure of the j o i n t because the secon&rl O - w g cannot respond t o t h e c l e v i s opening r a t e . d may not be capable of pressurizac?on. -The result would be a catastrophe of the highest order -

..¹¹ For the purpose of this report, a procedure is a formal set of instructions designed to guide and assist in the performance of a technical or management function. . ;: Ping the team and its purpose yu never

¶published) vith leader vaa fonned on 19 July 1985 and n s tasked with 8olVing , t h e problea for both the short and long term. This unoffidrl turn is e s s c n t l a l l y noneristent a t r h i s . t 3 ~ e . ,In DY opinion, the team must be o f f i c w y given the r e s p o n d b i l l y and the authority t o uecuta the Work . that needs t o be done o n i-om-interference b a s i r (full tlma a s s i p e n t u n t l l .

¶. _ d .

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292

¶VI-A

COIJTRHCTOR DES ICN RQMT ' S

¶L I I I - 1H -JSC 07700

294

-VOLUME X REVISION D

¶NATIONAL -

SPACE TRANSPORTATION SYSTEMS

¶PRoaRAM

.. , c

¶SPACE SHUTTLE FLlQHTAND QROUND SYSTEM

SPECIFICATION

¶S-BER 30,lW

¶)r 4 1 GE ME N ! . SLOutSCMENlS

296

3.2.i.1.17 3.2.Ll.17.1 I .

¶Zhe S h u t t l e ? l i g h t V e h i c l e d e s i n a h 1 1 s a ~ t ~ a n r i r o n m d ens i tg n regoiremeats s p w c f f i a d ia Apgesdf. 10.10.

¶@ rwtrr t o t h e D e r i a t i o a / s a i r a r t a g * i s t r c n t cf t h e document-A

¶)-YO w

297

¶8.0 me YP6Em 3 O Y C C A m

¶8 L ~ ~ C B O ~ a . a 0.95 p r o C a b & l t y of 80 p*-tratiOn

LI urra)rrr .......__ d u r i n g .the BaXiBum t o t a l time

¶f o r S O 0 ~ i u i o m 8i n o r b i t , n8img t b e m e t e o r o i d Bodel d e f i n e d i n S a c t i o n 1.5.1 o i 211-60627. 8.1 ,8ITICIOID IIDACX. SpaCO S b u t t l a Bmteoroid i ~ p c t i e y a u e m e n t m m h r l 1 , b e mpecifimd belomr

¶10.10-!4

N A S A TECHNICAL MEMORANDUM

¶NASA IM X - U 7 9

TERRESTRIAL ENVIRONMENT (CLIMATIC) CRITERIA

¶GUIDELINS FOR USE IN AEROSPACE l@HlCLE DEVELOPMENT, 1973 REVISION

¶...... NA3A George C. Manball Space Flight Center Marsball ,!$ace Flight Center, Alabama

299

¶I I I 1 I I I I I I 1 I I

¶Local S t u d u d T i n - i o u

302

¶*C

1a.m. ah B 2 a& B a a#.⁴⁴ Rogers Commission Report, Volume 11, p. H-1. 4 to. a 6 to.a

6 a — 4

7 a000 8 a 0 s ti.⁷⁷ bid. 10 a&@ 11 as. o 18 MB a 6 f p.m. a7. s

2 I;& 6 . a ' as. o

4 aha 6 as. a 0 ILO 7 aa.a at. 7 s a.0

¶10 MOO

¶11 ao. 0 ia arld $000

303

¶2.0 APPLlCABLI L O C O ( l X l t S . Zhe belor l i a t e d d o c u n n t s for. a p a r t of t h i s appendis t o t h e o a t e i t q e c i f i e d h8K8in. %has* doculents a h a l l be h d i r i d i u l l j a&grcved.a8 baselin. reguirmmot8. The .Corroat L.aoom of each d o c o ~ o n t8.1 be determimad fro8 JH: 08101, Space $ b o t t l e Program L e v e l I1 Eaaeline 0 8 ~ ~ i p t i Oand J Stat08 h F 0 Z t .

¶lpPtrlCtpt-8 SD73-LB-E069-1 Stroctoral D e r i g r toad. Data fook, (Current Issue) BaSOli80 lebicl. r 8 d #iS.iOnS

¶Ref. Para- 3.3, 3.3.1, Zable 10.11.1

¶S D7 3-5 I-0069-2 (curcent 1SSU.J

¶SD73-SY-0069-3 Stroctoral DaaiQ8 Load8 Data took, (Corrent laaoe) ~ x t e r m lzamh l e i . Para. 3.3, 3-32. Zakle 10.11.1

¶SC73-SB-0069-Y S t r o c t o r a l Design Load. Data took, ( c u r m o t 1SSU.J S o l i d l o c k e t Booster8 S t r o c t u r a l

Load. Ref. Rara. 3.3, 3.3.4, Zablo 10.11.1

¶SD73-SU-0 18 1- 1 ( c a r r a n t Ia8oe) -

Aorodyna~icBeating Data BOOK, Orbitec Aacent (6008. I, 11 and XIXJ Def. Dara. 3-1, 3.1-1, Zablr 10-11.1

¶SD73-5s-0181-2 (Cucront Issue) -

A u o d y n a l i c fiOatiBg Data Book axtarnal t u k u c a n t ( ~ o o k sI u d XX) Be:. Para- 3.1, 3-1.1, Zabla 10.11.1

¶SC73-L U-G 181-3 (Cursant Issue)

Aerodynamic Beatis9 Data Book, S h u t t l e l e h i c l e BCG8t.L (Book8 I and 11) - ISca8t

¶Bet. Para. 3.1. 3.1..1, T i t l e 10.11.1

10.11-6 — 0

304

¶SE73-SB-0 lei-u Aarod naric Uaating Dat. Book. S p c o (Currant I u o a J Shuttie Eain I n g i r o

¶Bat. Para. 3.1, 3.1.1. t a b l a 10.11.1

¶SD73-SB-0 181-3 (Cucraot Isma) sn73-s~-01ei-~ Aorody~a8icU O a t i B g Data Book, (Current Imua) L i g ht w ei g ht Ixtatnal tank-Ascent

¶Dot. Pdra. 3.1

A c o u t i u and Sbock Data Book. Spas. Shuttle Sy8t.a Dot. Para. 3.9, 3.5, Ydlo Y0.11-1

¶S O 7 u-s ll-0 14 4 lbarnal l o t a r t a c e s Design fat. Cook- [Curreot Inso.)

¶9.1. para. 3.2, t a t l a 10.11.1

¶10.11-7

305

¶SD 74-SH-0144D

SPACE SHUTTLE PROGRAM THERMAL INTERFACES DESIGN DATA BOOK

¶DECEMBER 1977 SDM BASELINE

Contract NM9-14000 IRD UO. St-699TZ ms 2.2.1 Prepared by Approved by I

¶m o d *nrlyrir Shuttlo h r o Scioncer

306

¶1.1 SCOPE

¶Confainad lurein are ebb t h e m 1 demian data roquird t o c m ~ l e t ethe thermal interface definition# for thm f o l b V h 8 interfaem control docmentr (1CD's):

ICD 2-12001 orbiter VableldPlcerorl zurt ICD 2-16001 Orbiter V.hiclel¶olid W t iooetu ICD 2-26001 External T d S o l l d lockac b o m t e r ICD 13n-um Space Shuttle 0rbic.r Vahfcle/IUim w i n e

¶1.2 APPLIWLL DotsQmm

The ~ t ~ r &r-U l C h C hrr mm m f f m c t on ch. f h .⁴⁴ Rogers Commission Report, Volume 11, p. H-1. damicn ere

¶dmfinu! in the folloving doeuuncm:

JSC 07700, Space Shuttle Ili&btand Ground S y e t ~S p e c l f i u t i o n . c VOlUu x, Appmadi. 10.10, h.w.1 EnViroIMt Dma* Raquirunrr. NASA M X6619S, Diertibution of Euht ~ t w r o l o g i c a iVarirblea- ta Cepe Kenamdy, ?lorid., and Vatdenbe- Air ?ore B u m . C a l i f o r n L ; f u r i h l l Space ?ll.gbc Cancar ( b e d 2i-r 19, 1973).

¶The lnducd envir-te applicable t o tha Shuttle a y a t r elamat. per- f a d - aa part of ch. h t w r a c d fl-t d i e l a era d e f i n d in ch. follovino date boob:

SD 73-58-0181-U, Spec. Shuttle Aarodpmlc autlxu Data Book -0rbicar Ancmt. 001- I ( d e e d I e b r t u v 1975)

SD 73-sa-0181-2. sp.ee shutcia .rod- bet- ~ a t ai o o k - L t a d Tank Ancent. Voltmm I1 (datmd JUM1976). SD 73-s8-0183-3. Spre. Shutel. h r o d y u m i e R u t i n # D.ca Boot-ShuCCla Vehicle Booate? A m e ~ t .Voluu I11 (dated Septuber 1 9 7 6 ) . SD 73-58-0181-1. Swce Shuctlm Aarodynnic b a t i n g Data Book-SPac. Shuttle Hain &gin Amcant, On-Orbit urd Cutry, Voluu lV (dated Saptambar 1977)

¶The#. book. form part Of the Space Shuttle n i g h t Md Ground S y p t p . S p m c l f l - cetion. JSC 01700. Voluu X, A p p d k 10.11, Induced Laviroaunt Deei8n R*qulr.nrenti. The indued ermitonnunt# data are available on mapatic tape record. a0 s p e c i f i e d Ln Rafermce 1 for thm orbiter. Referanea 2 for the ucernal tank. end Rafermnce 3 for the Shuttle vehicle b o o l e u .

¶1-1 z-15

307 308