### DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. 

### FAA-2014 -1130; Directorate Jdentificr 2015-NE-04-ADl RIN 2120-AA64 Airworthiness Directives; Pratt & 

### Whitney Turbofan Engines AGENCY: Federal Aviation Administration (FAA) , DOT. 

### ACTION: Notice of proposed rulemaking (NPRM). 

### [491 0-13-P]

SUMMARY: We propose to adopt a new a irworthiness directive (AD) for all Pratt & 

### Whitney (PW) PW4164-1D , PW4168-1D , PW4168A-1D and PW4170 engines, and certain PW4164 , PW4168 , and PW4168A turbofan eng in es . This proposed AD was prompted by fuel nozzle-to-fuel supp l y manifold interface fuel leaks

. This proposed AD would require inspecting fuel no z zles for signs of leakage , replacing hardware as required , and torqueing to specified requirement. We are proposing this AD to prevent fuel leaks which could result in engine fire and damage to the ai rpl ane. 

### DATES: We must receive comme nts on this proposed AD by [INSERT DATE 60 DAYS AFTER DATE OF PUBLICATION IN THE Fede r al Register]. 

### ADDRESSES: You may send comments , using the procedures found in 14 CFR 11.43 and 11.45 , by any of the following methods:
• Federal eRul emak in g Portal: Go to http: //www.regulations.gov. Follow the instructions for submitting comments
. • Fax : 202-493-2251.
• Mail: U.S. Department of T ransportation , Docket Operations , M-30, West Building Ground F loor, Room W 1 2-140 , 1200 New Jersey A venue SE. , Washington, DC 20590

.• Hand Del iv e r y : Deliver to Mail address above b etween 9 a. m. a nd 5 p.m., Monday throu g h Friday, exce pt Federal ho lid ays . Fo r se r v ic e inf o rm a t ion id e nt ified in thi s p r oposed AD , contact Pr att & Whitn ey, 400 Main St.. Eas t H a t 1ford, CT 06 1 08; phone: 860-565 -8 770; fax: 860-565-4503. You
may v i ew this se r vice information at the FAA, Engi n e & Prop e ll er D irectorate , 12 New E ngland Execut i ve Park, Burlington, MA. For information on th e avai lab ili ty of this materi a l at th e FAA, call 781-238-7 1 25

. 

### Exa minin g the AD Docket You may exa min e the AD d ocke t on the Internet at http: //www. regu lation s.gov by
searchin g for and locating D ocket No. 

## r: AA-20 14- 1130 ; or in pe r son at the D ocket Management Faci li ty between 9 a .m. and 5 p.m . , Mo nd ay through Friday, excep t Fede ral holidays

. Th e AD docket contains this propo se d AD , the regulatory eva luation, any
comm e nt s receive d , and other inf orma ti o n . Th e stree t add r ess for th e Docket Offi ce (p hon e : 800-647-5527) is in the A DDR ESSES sect ion. Comments wi ll be availab le in the A D docket shortly afte r receipt. 

### FO R FURTH E R INF ORMATIO N CONTAC T : Kathe ryn Malatck , Aerospace Eng i neer, E n g in e Certific ation Offic e , FAA , Engine & Prope ll e r D ir ec torate , 12 New E n g l a nd Exec uti ve P ark, Burlin g ton , MA 0 1 803; phone: 781- 238-7747; fax : 78 1 -238- 7199; email: katheryn.malatek @ faa.gov. 

### SUPPLEM ENTA RY INFORMATIO N : Co mm e nts In v ited We invite yo u to se nd any written r e l

evant data , view s , o r arg um ents about this N PRM. Se nd yo ur co mm e nts to a n address li s ted und e r th e A DDR ESSES sect ion. ln cl u de " D ocket No. F AA

- 2014 -11 30: Directorate I dentifier 20 1 5-NE-04-AD " at th e beg inni ng of your commen ts . We specifically in v ite comments on the ove ra ll regu l atory. economic, e n viro nm e nt a l, and ene rgy aspects of this N PRM. We will co n side r all 2comments r eceived by the closing date and may amend this NPRM because of those
comme n ts. We wi ll post all comments we receive , w ithout change , to http: //W\vw.regulations.gov, including any personal information you provide. We will also post a report sum mariz ing each substant ive verbal contact we receive about this N P RM

. Discu ss ion We r eceived r epo rts of four fuel no zz le leaks in service and an additional six fuel nozzle leaks f ound during shop v i si t s. The root cause is inad equat e torque of the fuel nozzle

- to-fuel supply manifo ld B-nuts for the temperatures that the fu el nozzles experience. This co ndition , if not corrected , could result in eng i ne lire and damage to the
a irp lane. R e late d Se rvi ce lnf01·mation und e r · 1 CF R P a rt 51 We reviewed PW A lert Service Bulletin (ASB) No. PW4G-I 00-A73-44, dated October 10, 2014. This serv ice info rmation con t ains infom1ation regarding fuel no zzle manifold inspection and fuel no zz le-to-fu e l supp ly manifold B-nut torqu e requirements. T hi s serv ice informat i o n i s reasonably availab l e because t h e interested parties have
access to it th r ough th ei r nonnal course of bu s iness or see ADDRESSES for other ways to access this se r vice information. FAA's D e te rmin a ti o n We are proposing this NPRM because we evaluated all th e relevant infom1ation and de termined the unsafe condition desc r ib e d p r ev iously i s lik e ly to ex ist or develop in
o th er prod u cts of th e same type des ig n .

· Propo se d A D R eq uire m e nts This N PRM wou ld require inspecting the fuel nozzle-to-fuel sup pl y manifold interface for evidence of leaks and replacing hardware in cases where fuel leaks are 

### 3identified. This NPRM also requires torqu e in g certain B-nuts to the s pec i fied req u i r eme n t. 

### Diff e r e nc es B e tw ee n thi s Pt·opo se d A D a nd th e S ervic e Inform a ti o n PW ASB No

. PW4G

- l 00-A 7 3-44 u ses calendar dates f o r compliance time. Thi s N PRM u ses cycles. Us in g cycles from the effective date of the A D s upport s the intent o f the ASB and e n s ures adequate compli a nc e tim e after the effective date of the AD. 

### C o s t s of C ompliance We estimate th at this proposed AD would affect about 72 engines i n sta ll ed on airplanes of U.S. registry. The average labo r rat e is $85 per hour. We es timate that part s replacem e n t w ill cost about $ 1 ,3 56 per e n g in e . Ba se d o n th ese fi g ures, we es timate the cost ofthis prop ose d AD on U.S. operators to b e $39 1 , 392. 

### Authority fot · thi s Rulemakin g Tit l e 49 of the Un i ted S ta t es Co de s pecifies the FAA ' s au th o rity to issue rul es on aviation safe ty. S ubtitl e I , section 1 06 , d escrib es the authority o f th e FAA Adminjstrator. S ubtitl e V II : Aviat io n Program s, de scribes in m o r e detail the scope of th e Age ncy's authority. We a r e iss u ing this ru le m ak i ng unde r the auth o ri ty desc rib e d i n S ubt it le VII , Part A , Subpart III , Sect io n 44 70 I: " Gen e ra l req uire me nts. " Under th a t sec ti o n , Cong r ess charges the FAA w it h promoting sa f e 

### il ig ht o f civil aircraft in air co mmerce b y prescrib in g reg ul at io n s for pract ices , m e th ods , a nd procedures the Adm ini s trator find s
ne cessar y for safe ty in air commerce. Thi s r eg u l ation is within th e sco pe of that authority because it addresses an u nsafe cond it io n tha t is likely to ex ist o r develop on p r od u c t s iden tified in thi s rul emak ing action. 

### Re g ulato ry F indin gs We determined that this proposed AD wo uld not hav e federalism i mp l ications under Executive Order 1 3 1 32

. Thi s proposed AD would not h ave a s ub s tantial direc t 

### 4

### effect on the States , o n th e relation s hip between the national Government and th e States,
or on the distribution of power a nd responsib ili ties among the vari ous leve l s of government. For t he reasons di sc us se d above , I ce rtify thi s proposed regu lat io n: (1) Js not a ·'sign ifi cant regu lato ry act ion·' under Executive Order 12866 , (2) Is not a .. s ign ificant rul e" under the DOT Regulatory Po li cies and Procedur es (44 FR 11034 , February 26, 1979) , (3) Will not affect i ntrastate av iat ion in Alaska to th e ex t e nt that it justities making a regul atory distinc tion. and (4) Will n ot have a significa nt eco n om ic impact , positive or negative , o n a substan ti a l number o f s ma ll enti ti es under the c r iteria o f the Ref,ru lato ry Flex ibility Act. 

### L is t o f Su bj ects in 14 CFR P a r t 39 Air transpo rtation, Ai rcraft , Aviation safety, Incorporation by refere nce , Safety. 

### T he P ro po se d Ame ndm en t Accord in g ly, under the autho rit y delegated to me by th e Admin is trator , the FAA proposes to ame nd 14 CFR part 39 as fol lows: 

### PART 39

- A IRWORTH I NESS D IR ECTIVES I

. 

### The auth o rity c itation for part 39 co ntinu es to r ead as fo ll ows: Authority: 49 U.S.C. 106(g) , 40113,44701. 

### § 39.13 [Am e nd edl 2. The FA/\ ame nd s§ 39 .1 3 by ad ding th e following new airworthiness directi ve (AD) : 

### P r a tt & 

### W hi t n ey : Docket No . FAA-20 14- 1 130; D irecto rate Identifier 20 15-NE

- 04-AD. 

### (a) Co m me n ts D u e Date We mu st rec eive comme nts by (INSERT DATE 60 DAYS AFT ER DATE OF P UB LICATION I N Ti l E federal Re g ister]. 5

### (b) Affecte d ADs None. 

### (c) App lic abi li ty This AD app li es to a ll P ratt 

### & W hitn ey (PW) PW4164-1D , PW4168-lD , PW 4168A

- 1D and PW4 170 e n g in es; and all PW4l64. PW4168, and PW4168A n1rbofan engi nes that have incorporated ei th er P W Service Bulletin (SB) No

. PW4G- I 00

- 72-214. dated Decembe r 15 , 20I l or P W SB No. PW4G-J 00-72-2 19, Rev is i on I , dated Octob e r 5. 20 11. 

### (d) U n sa fe Co nditi on This AD was prompted by fue l nozzle-to-fuel s upply manifold int e rface fue l lea ks. We a re issuing thi s AD to prevent fu e l leaks wh ich could result i n e n g in e fire a nd damage to the a irpl ane. 

### (c) Co mplianc e Co mply w ith this A D within th e comp li a nce tim es s pecified , un less a lr eady don e . (I) Within 800 fli ght hours afte r the effect ive date of thi s AD , and w ithin every 800 hours since la s t inspection the reafter , inspect all fu e l nozzle -to -fu e l s uppl y man if old int e rf aces for ev iden ce of fuel leaks , soot, and coke forma ti on. Use th e Acco mpli s hm e nt In stru c tions , P art A , ofPW A l ert Se rv ice Bulletin (ASB) No

. PW4G-I 00-A 73-44 , elated October 10 , 2014 to do the inspection s . (2) Replace hardware that fa il s an inspection. U s e the Acco m plishment In s tru ctions, Part A , ofPW ASB No. PW4G-1 00-A73-44 , dated October I 0 , 20 14 to d o the replacement. 

### ( f) Ma ndato ry Term in at in g Action ( I) Insp ec t a ll fue l no zzle- to -fuel s upply man i fold inte r faces for fu e l leaks, soot, and coke formation , rep lace h ardware tha t fa il s inspect ion , and re -torque a ll fuel no zzleto-fuel s uppl y manifold B-nuts as f ollow s : 

### 6(i) For e ng in es with fewer than 1 , 500 cycles on th e ef f ec tiv e date of this AD , before acc umulating a nother 650 cycle s , not to exceed 1 , 900 cyc les. ( ii) For e n g in es with 1 , 500 cyc les or more , but fewer than 2 , 500 cycles on the effective date of this A D , before accumul atin g another 400 cycles. no t to excee d 2 , 700 cycles. ( iii ) For e ng in es with 2 , 500 cycles o r more on the eff ec ti ve d ate of this AD, before accumul a tin g anothe r 200 cyc les . (2) Use th e Accomplishment In s truction s , Parts B through E, of PW AS B No. PW4G-l 00-A 7 3 -44 , dated Octob e r I 0 , 20 14 t o do the inspecti o n. re pl ace ment , and
reto rqu e i ng. (g) D efi nition For th e purpose of this AD "cyc les" is defined as cyc l es s inc e new o r cycles since the incorpor at io n ofPW SB No. PW4G-1 00-72-2 14, dated D ece mb e r 15 , 20 1 1 or SB No. PW4G-10 0

- 72-2 1 9 , Rev i sio n 1 , dated O ctober 5, 20 11. ( h ) A ltern at ive Methods of Compliance (AM O Cs) Th e Man age r , Engine Certification Office, FAA , may approve AMOCs for thi s AD. Us c the proce dures found in 1 4 CF R 39

. 19 to make yo ur request. You may ema il yo ur reque s t t o: /\NE-AD-AMO C @ faa. go v. ( i) R e lated Inf o rmation ( 1 ) Fo r more information abo ut this /\0 , con tact Kath cry n Malatek , Ae ro s pace E ngine e r, E n g in e Certification Office, F /\/\, Eng in e 

### & Prop e ll e r Dir ec t orate, 12 New E ngland Executive Park, Burlington , M/\ 0 180 3; p hone : 781-238-7747 ; fax : 78 1 -238- 7199 ; ema iI: kath e ryn .malatek @ faa.gov. (2) PW ASB No

. PW4G-1 00-A73-44 , dated October I 0 , 20 14 , w hich is not inc o rporat ed b y refe re nc e , can be obtai ned from Pratt & Whitney using the con tact infonnation in paragraph 0)(3) of thi s proposed rul e . 7(3) For serv i ce information id en tifi e d in this propo sed rul e , con tact Pratt & Whitney , 400 M a in St., East Ha1tforcl , CT 06 I 08; phone: 860-56 5-877 0 ; fax: 860-565

- 4503. (4) You may view this service in formation at the FAA , Engi ne & Prop eller Dir ectorate , 12 New Eng land Execut i ve Park , Burlington , MA. For information on the availability of this material at the FAA , call 781-238

- 7125.

Issued in Bu rlin gto n , Massachus etts, on Ap ril 10 ,2 015.

Ann C. Mollica , Acting Directorate Manager, Eng in e 

### & Prope ll er Directorat e , Ai r craft Certificat ion Ser vice

.



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