# 0- ^ Ronal d J
. Hinderberge r Lead Administrato r Delegate d Compliance Org

. Commercia l Airplane s 1"h e Boein g Compan y 

### ^;^?:spoRWiO N „;;:iOFtR/V[ION S OC T0 1 201 0 BDCO-10-0418 6 U.S
. Departmen t

o f Transportatio n Docke t Managemen t

Syste m 120 0 New Jerse y Avenue , S E Wes t Buildin g Groun dFloor , Roo mW12-14 0 Washington , D C 2059 0 

### A!C : 3 1

Subject :

Model : Petitio nfor Exemptio nfromTitl e 1 4 Cod e o f Federal Regulation s sectio n25.1309(c ) at Amendmen t

25-11 6 WithRespec t

t o Cre w Annunciatio no f

th e Statu s o f

Fue l Syste m Component s 787- 8 Th e Boein g Compan y respectfull y submit s thi s petitio nfor exemptio nfrom specifi c aspect s o f

Titl e 1 4 Cod e o f

Federal Regulation s Sectio n25.1309(c ) a t Amendmen t

25-11 6 for

alimite dnumbe r

o f Roll s Royc e (RR ) Tren t

100 0 powere d787- 8 airplane s a s describe di nth e summary below
. Th e enclosur e t o thi s lette r provide s th e detail s o f

th e petitio ni naccordanc e withTitl e 1 4 Cod e o f Federal Regulation s Sectio n11.81
. Th e followin g summary i s provide dfor th e Federal Registe r

i naccordanc e with1 4 CFRSectio n11.81(f)
. Summar y fo r

Federa l Registe r Petitioner : Th e Boein g Company
. Sectio no f

1 4 CFRAffected : Sectio n25.1309(c)
. Descriptio no f

Relie f Bein g Sought : Boein g i s requestin g relie f from frill complianc e t o Sectio n25.1309(c ) for th e Roll s Royc e (RR ) Tren t

100 0 powere d787- 8 for th e unambiguou s an dtimel y indicatio nt o th e flight

cre w t o alert

the mo f ananticipate dfuel syste m contamination
. If

granted , thi s exemptio nwil l allo w sufficient tim e for Boein g to develop , certif

y an dincorporat e int o productio nane w alertin g syste mthat i s fully complian t

withSectio n25.1309(c)
. Th e exemptio nwoul dallo w relie f from th e requiremen t

i nSectio n25.1309(c ) to provid e indicatio nt o th e cre w o f anticipate dfuel syste mcontaminatio nfor Roll s Royc e Tren t

100 0 powere d787- 8 airplane s delivere du p t o Jun e 30 , 201 4 an dDecembe r 31 , 201 8 for

retrofi t incorporation
.^
. Pag e 2 Docke t Managemen t

Syste m BDCO-10-0418 6 Very trul y yours , 

# / 7 ^ f /^/y^- ^
Christin e Thompso n LeadProjec t

Administrator , Developmen t Project s (425 ) 266-6572 , M C 03-5 6 FAX : (425)294-934 0 Enclosure : Petitio nfo r

exemptio nfro m1 4 CF R25.1309(c ) a t Amdt
. 25-11 6
c c Nam e Al i Bahram i Ke nSchroe r To mThorso n Sherry Veve a Davi dSolar Ke nFontain e Lette r ED T Paipe r ED T ED T ED T ED T Enclosure s

Yes Yes Ye s Yes Ye s Yes Comment s

ANM-IOO S ANM-IOO S ANM-140 S ANM-140 S EASA EAS AEnclosur e t o BDCO-10-0418 6 Pag e 1 of 5 Petitio n fo rPartia l Exemptio n fro m 1 4 CF R 25.1309(c ) Amendmen t 25-11 6 fo rRoll s Royc e Tren t 100 0 Powere d 787- 8 Airplan e FA AProjec t Numbe rPS06-041 3 Nam e an d Addres s o fth e Petitione r CM

. Thompson , Manager , Lea d Projec t Administrator , Developmen t Project s Th e Boein g Company , P O Bo x3707 , Seattle , Washington , 9812 4 B
. Sectio n o fth e Cod e o fFedera l Regulation s (CFRs ) tha t ar e affecte d A s provide d fo ri n 1 4 CF R 11.61(b) , Boein g hereb ypetition s fo ra partia l exemptio n t o th e followin g CFR : Reaulatio n 1 4 CF R 25.1309(0 ) At

Amendmen t 11 6 Whic h Require s

(c ) Warnin g informatio n mus t b e provide d t o alert th e cre wt o unsaf e syste m operatin g conditions , an d t o enabl e them t o tak e appropriat e correctiv e action
. Systems , controls , an d associate d monitorin g an d warnin g mean s mus t b e designe d t o minimiz e cre werror s whic h coul d creat e additiona l hazards
.

### Enclosur e t o BDCO-10-0418 6 Page 2 of 5

Th e exten t o frelie fbein g sough t Regulatio n Requires : Exten t ofrelie f bein g sought : 1 4 CF R Par t 2 5 Sectio n 25.1309(c ) Amendmen t 11 6 Th e FAAha s

determine d tha t i n orde rt o compl y wit h §25.1309(c ) fo r th e R R Tren t 100 0 fue l system , a s i t applie s t o th e FOH E an d fue l filter , a n unambiguou s an d timel yindicatio n t o th e fligh t cre wi s require d t o alert them ofa n anticipate d fue l syste m contamination
. Boein g seek s tim e limite d relie ffro m ful l complianc e t o §25.1309(c ) fo rth e Roll s Royc e (RR ) Tren t 100 0 powere d 787 - 8 fo rth e unambiguou s an d timel yindicatio n t o th e fligh t cre wt o alert the m of a n anticipate d fue l syste m contamination
. Th e tim e limi t bein g sough t i s unti l Jun e 30 , 201 4 fo rproductio n incorporatio n an d Boein g recommend s Decembe r31 , 201 8 fo r retrofi t incorporatio n b yth e operator s ofth e airplane s delivere d unde rthi s exemption
. Relie fi s necessarvbecause : Th e R R Tren t 100 0 engin e i s th e firs t engin e t o incorporat e a bypas s i n th e Fue l Oi l Hea t Exchange r(FOHE)

. Th e bypas s wa s adde d t o addres s th e conditio n o fa transien t hig h concentratio n o

fic e I n fue l whic h coul d potentiall ybloc k th e FOH E an d resul t i n significan t los s ofthrust
. Th e FOH E bypas s i s no t presentl ydesigne d t o provid e cre walertin g t o indicat e a n impendin g o ractua l bypas s condition
. Th e FAArecentl yprovide d Boein g guidanc e regardin g wha t i s neede d t o sho wcomplianc e t o §25.1309(c ) fo rfligh t cre w alertin g ofFOH E impendin g o ractua l bypass
. Th e FA Aha s als o provide d additiona l guidanc e regardin g FOH E an d fue l filte rfligh t dec k

indicatio n fo rdua l engin e impendin g o ractua l bypass
. Th e 787- 8 i s no t currentl ydesigne d t o provid e th e FAA-require d dua l impendin g bypas s indicatio n fo rth e filte ran d doe s no t currentl yprovid e impendin g and/o rbypas s indicatio n fo rth e FOHE

. Boein g i s requestin g relie ffo ra limite d numbe ro f787- 8 airplane s t o allo wsufficien t tim e t o develop , validate , certif yan d incorporat e int o productio n a complian t FOH E bypas s indicatio n an d alertin g schem e a s wel l a s addin g additiona l alertin g fo rdua l engin e impendin g fue l filte rbypass
. Followin g incorporatio n ofth e complian t desig n int o production , Boein g wil l issu e a servic e bulleti n tha t recommend s al l airplane s delivere d unde rthi s tim e limite d exemptio n b e retrofitted

. Th e relie fsough t i s limite d t o thos e 787- 8 aircraf t complete d prio rt o th e productio n incorporatio n ofth e complian t message . Th e productio n incorporatio n ofth e complian t messag e wil l b e accomplishe d n o late rtha n Jun e 30 , 2014
. Aservic e bulleti n wil l b e availabl e n o late rtha n Jun e 30 , 201 4 suc h tha t al l 787- 8 airplane s delivered unde rthi s exemptio n ca n orde rpart s an d instal l a complian t configuration

. Th e Boein g Servic e Bulleti n wil l recommen d tha t al l airplane s delivere d unde rthi s exemptio n b e retrofitte d b yDecembe r31 , 2018
.Enclosur e t o BDCO-10-0418 6 Pag e 3 of 5


### D
. Descriptio n o f th e Issu e A s currentl ydesigned , th e 787- 8 provide s th e followin g fligh t dec k indicatio n fo rimpendin g and/o ractua l bypas s o

f th e FOH E an d fue l filter

.
• Fue l filte rimpendin g bypass : EICAS advisor ymessage s wit h clea rindicatio n o fLef t o r Righ t engin e fue l filte rimpendin g bypass
.
• Non-norma l checklis t procedure s ejxplainin g th e potentia l conditio n an d pilo t actio n fo r on e engin e aler

t o rfo ralert s receive d fo rbot h engines
.
• FOH E impendin g and/o ractua l bypas s i s not directl yindicate d wit h EICAS message s t o th e fligh t crew . Th e FA Ahas state d that recen t event s i n servic e an d i n experimenta l fligh t tes t hav e le d t o a recognitio n that fue l system s hav e th e potentia l t o becom e clogge d b yice o rlarg e contaminant s (beyon d that whic h i s conside runde r14CF R Par t 3 3 certification ) an d restric t fue l flo wt o engines , an d potentiall yresultin g i n a multipl e engin e powe rlos s event
. Th e FA Arecentl yclarifie d that fligh t crewalertin g fo rimpendin g and/o ractua l FOH E bypass , an d additiona l fligh t crewalertin g whe n bot h engine s o n th e sam e fligh t ar e subjecte d t o fue l filte ro rFOH E impendin g bypas s conditio n ar e require d t o b e complian t t o §25.1309(c)

. Boein g intend s t o compl ywit h thes e requirement s b yimplementin g fligh t dec k indicatio n fo r th e FOH E an d elevatin g th e EICAS fligh t dec k aler t fo ra dua l engin e impendin g and/o rbypas s conditio n o

feithe rth e FOHE s o rfue l filters

. Give n th e advance d stag e o fth e 787- 8 progra m relative t o gainin g basi ctyp e desig n certification , Boein g i s requestin g thi s tim e limite d partia l exemptio n t o enabl e a n orderly , robust an d reliabl e design , implementatio n an d verificatio n o f th e subjec

t alerting
. Boeing' s assessmen t o

f th e require d desig n an d implementatio n activitie s suggests that th e firs t opportunit

yt o implemen t th e ne

walertin g schem e coul d take a s lon g as Jun e 30 , 2014
. To incorporat e a complian t design , i t i s anticipate d that software change s t o th e electroni c engin e contro l (EEC ) an d displa yan d crewalertin g ar

e require d a s wel l a s hardwar e change s t o th e EE C (an d associate d wiring ) an d th e FOH E casting
. Hardwar e change s t o th e EE C an d th e FOH E castin g ar

e lon g lea d desig n changes
. Thi s productio n cut-i n positio n wil l provid e adequat e aler

t developmen t an d testin g tim e an d avoi d unschedule d revision s o fth e above mentione d software , an d allowadequat e tim e fo rdesig n an d qualificatio n o fth e EE C (an d associate d wiring ) an d desig n an d procuremen t o fth e FOHE

. Base d o n curren t understanding , there woul d be approximatel y10 0 R R Tren t 100 0 equippe d 787- 8 airplane s delivere d unde rthi s exemptio n that ma yb e subsequentl yretrofitte d vi a service bulleti n that wil l b e availabl e n o late rtha n Jun e 30 , 2014
. Selectio n o fDecembe r31 , 201 8 wil l enabl e operators t o accomplis h thi s retrofi t i n a schedule d bas e maintenance check
.Enclosur e t o BDCO-10-0418 6 Pag e 4 of 5
Statemen t o fN o Advers e Effec t o n Safet y Th e R R Tren t 100 0 fue l syste m architectur e i s simila ri n it s desig n t o othe rR R engine s installe d o n Boein g an d non-Boein g aircraft

. Thi s fue l syste m desig n ha s accumulate d man y million s ofin-servic e hour s (mor e tha n 5 0 millio n hour s o n Boein g powere d aircraf t only ) an d n o engin e in-fligh t shutdown s o rin-fligh t powe rloss event s hav e bee n associate d wit h FOH E blockage du e t o soli d contaminatio n bein g introduce d i n th e worldwid e fue l suppl yo rsoli d contaminatio n left i n th e airplan e fue l tanks
. Th e introductio n of th e FOH E bypas s i n th e R R Tren t 100 0 furthe rimprove s th e desig n b yprovidin g a n alternat e pat h fo rth e fuel , reducin g th e likelihoo d o fa sudde n engin e shutdow n du e t o fue l starvation
. Th e R R Tren t 100 0 mai n fue l filte rcomplie s wit h th e requirement s o f §25.997(d ) an d §25.1305(c)(6)

. Th e fue l filte ri s size d t o protec t al l downstrea m fue l meterin g components , hig h pressur e (HP ) pump , an d burner s fro m gros s contamination
. Whe n th e filte ri s expose d t o contaminate d fue l an d debri s accumulate s t o th e poin t tha t i t reache s impendin g bypass , a n alert i s provide d t o th e fligh t dec k vi a a n advisoryleve l messag e accordin g t o th e requirement s of§25.1305(c)(6)

. Eac h engine monitor s th e pressur e dro p (delt a P ) acros s th e fue l filte ran d a n alert i s provide d t o th e fligh t cre wvi a a n EICA S Advisorymessag e (EN G FUE L FILTE R L o rEN G FUEL FILTE R R ) wel l befor e th e delt a P reache s a leve l tha t woul d resul t i n bypassin g th e fue l filter

. Thi s alertin g schem e provide s a n adequat e leve l o f safet yfo rth e airplane s affecte d b ythi s exemption
. Thi s i s th e sam e fue l filte ralertin g o n al l Boein g productio n airplanes
. Th e R R Tren t 100 0 FOH E uni t itsel fha s bee n qualifie d accordin g t o th e fue l contaminatio n requirement s i n EAS AAM C E 670
. Thes e requirement s hav e bee n use d i n th e pas t fo r qualificatio n ofFOHE s o n othe rR R engines
. Th e level s of contaminatio n i n th e fue l use d durin g th e qualificatio n proces s ar e muc h greate rtha n th e standar d concentratio n limi t use d t o determin e th e acceptabilit yo fth e fue l fo rus e i n je t aviatio n accordin g t o industrystandards
. Th e FOH E successfull ycomplete d al l qualificatio n testing
. Th e prove n servic e historyofth e R R fue l syste m architecture , th e maintenanc e action s define d t o preclud e th e introductio n ofsoli d contaminatio n int o th e fue l tank' s an d th e existin g fligh t dec k

message s an d associate d cre wprocedure s provid e a n adequat e leve l of safet yfo r th e airplane s affecte d b ythi s exemption
. Unde rthi s propose d partia l exemptio n i t i s expecte d tha t ther e wil l b e approximatel y10 0 airplane s delivered , an d Boein g recommend s thes e airplane s b e retrofitte d int o a full y complain t configuratio n i n 8 year s o rless
. I t i s expecte d tha t thi s smal l flee t siz e an d exposur e duratio n wil l resul t i n a n extremel ylo wlikelihoo d of a contaminatio n even t o f concer n occurring
.Enclosur e t o BDCO-10-0418 6 Pag e 5 o f 5

Statemen t o fPubli cInteres t Grantin g thi s petitio n i s i n th e public' s interes t becaus e i t woul d allo wadequat e tim e fo rBoein g an d Roll s Royc e t o develo p a n effectiv e an d robus t desig n solutio n fo rth e fligh t dec k indicatio n o fth e dua l fue l filte rimpendin g bypas s requiremen t an d FOH E impendin g and/o r bypas s requirement
. Conversely , i fth e requeste d relie f i s no t granted , th e additio n of a fligh t dec k indicatio n tha t bot h engine s o n th e sam e fligh t ar e subjecte d t o a fue l filte rimpendin g bypas s conditio n an d FOH E impendin g and/o rbypas s a t thi s lat e stag e of th e airplan e developmen t program woul d lea d t o delay s i n th e deliverie s of Mode l 787- 8 airplanes
. Availabilit yof787- 8 airplane s wit h th e R R Tren t 100 0 engine s wil l reduc e fue l bur n an d henc e reduc e emission s o fcarbo n dioxide , reduc e globa l emission s of NOx , an d reduc e operatin g cost s ofairline s fro m curren t in-servic e airplanes
. I n addition , withou t adequat e tim e t o develo p a robus t solution , nuisance fligh t dec k alert s in servic e hav e th e potentia l t o reduc e operationa l safet ywhe n fligh t crew s ar e taske d t o respon d t o fals e indication s potentiall yresultin g i n unnecessaryfligh t diversions , landin g a t airport s tha t the yar e no t familia rwith , an d conceivably , shuttin g dow n a n engin e unnecessarily
. Th e publi cinteres t wil l b e advance d b yth e gran t o f Exemptio n a s i t i s i n th e bes t economi c interes t ofth e Unite d States

. Man y787- 8 customer s ar e overseas . Furthe rdeliverydelay s of th e 787- 8 ar e no t i n th e interes t o fth e publi cdu e t o th e potentia l negativ e impac t t o export sales , th e balance-of-trade , th e gros s donnesti cproduc t an d economi chealt h o f th e Unite d States

. Privilege s o fthi s Exemptio n Outsid e th e Unite d State s Pe r1 4 CF R 11.81(h) , Boein g request s tha t th e privilege s o f thi s Exemptio n b e extende d outsid e th e Unite d States

. Thi s extensio n o f privilege s i s necessaryfo roperation s base d withi n foreig n countrie s havin g bilatera l agreement s wit h th e Unite d State s acceptin g FA A1 4 CF R Par t 2 5 a s thei rairworthines s standard s fo rtranspor t categoryaircraft

. Th e 787- 8 i s intende d fo rth e globa l marke t plac e wit h a launc h custome rbase d i n a countr yutilizin g th e Unite d State s ainA/orthines s standards
. H
. Conclusio n Th e requeste d tim e limite d exemptio n wil l allo wth e Boein g Mode l 787- 8 tim e t o compl ywit h th e requirement s recentl ypu t fort h b yth e FAA
. Th e relie f sough t i s limite d t o thos e 787- 8 aircraf t complete d prio rt o th e productio n incorporatio n of th e complian t message . Th e production incorporatio n o fth e complian t messag e wil l b e accomplishe d b yJun e 30 , 2014
. Th e Boein g Servic e Bulleti n wil l recommen d tha t al l airplane s delivere d unde rthi s exemptio n b e retrofitte d b yDecembe r31 , 2018
. A s discusse d above , passenge ran d cre wsafet ywil l no t b e appreciabl yaffecte d b ya gran t o f exemptio n i n thi s case .