D EPARTMENT O F TRANS PORTAT ION Fe d e ral Av i a tion Admini st ra ti on 1 4 CF R P a rt 3 9 !D oc k e t No

. FAA -2014 - 1127 ; Direc tor ate Id e ntifi e r 2014- NE-1 6-AD] RI N 2 120- AA 6. 4 A in vorthin ess Directiv es; Pratt & Whi t ney T urbof a n 'E n g in es AGENCY: Federal Aviation Administration (FAA) , DOT. ACT IO N: Notice of proposed rulemak ing (NPRM). { 4 910-1 3 -Pl

SUM M ARY: We propose to adopt a ne w a ir wOtthin css directive (A D ) for all Pratt & Whitney (PW) JT8D- 2 17C and .JT8D

- 219 turbofan e ng ines. This proposed AD was prompted by reports of c racking in the low-pressure turbine ( L PT) shaf t. Th is proposed AD establi shes a new lowe r lif e limit for these part s and would re qu i re r e moving affected LPT s haft s fro m se r v ice u s ing a drawdown plan. W e are proposing this AD to pre ven t failure of the L PT s haft , w hich co uld lead to an uncontained engine failure a nd dam age to the a irp l ane. DATES: We must rec e ive comments on thi s propo sed AD by [fNSERT D ATE 60 D A Y S AFTER DAT E OF PUBLI CA TION IN TH E Fede ral Regis ter]. A DDRE SSES: You may se nd com m e n ts , u s in g th e procedures found in 14 C FR 11.4 3 and 1 1 .45 , by any of the fo ll owin g methods:
• fed era l eRu le making Po rtal: Go to http: // www. r egulati o n s.gov. fo ll ow the in struction s f o r s ubmitting comments.
• Fax: 202 -4 93

- 225 1
. • M a il : U.S. D epartm e nt ofTransp o rt a t i on, D oc k et Opera tions , M- 30, W est Buil di ng Ground F loor, Room W12 -140 , 1 200 New Jersey Ave nu e SE. , Washington , D C 20590

.• Hand Delivery: De liver to Mail address above betwee n 9 a.m. and 5 p.m. , Mo nd ay thro u gh F ri day , exce p t Fede ra l ho l idays. For service information iden tified in this pro p osed AD , con t act Pratt 

### & Whitney , 400 Main St. , East Har t ford, CT 06 1 08; phone: 860-565

- 8770; fax: 860-565-4503. You
m ay v iew thi s service inf o rm ati o n at the FAA , E n g ine & P r ope ll e r Directo r a t

e, 1 2 New England Executive Park, Burli ngton , MA. Fo r information on the availab i lity of this mate ri a l at the FAA , ca ll 78 1 -238

- 7125. E xaminin g the AD Docket You may examine the A D docket o n the Internet at http: //www . regulations.gov by
se arc hi ng fo r a nd loca t in g D ocke t No. FAA -2014-1 1 2 7 ; or in pe r s on a t th e D oc ke t Manage m ent Fac i li ty betwee n 9 a.m. and 5 p.m. , Mo n day through Fri d ay , except Federal h o li days. T he A D docket co n tai n s this p roposed A D , th e reg ul ato ry eva l uat i o n , any co m ments received , and oth er infor m at io n . T he s tr eet address for th e Docket Office (phone: 800

- 647-5527) i s in the ADDRESSES sec t ion. Comments will be available i n the A D docke t s h o rtl y a ft e r r ece ip t. FOR F U RTHER IN FORMAT IO N CO N T AC T: Jo-Ann T h eriault, Aeros p ace Eng ineer, Eng ine Ce r t i fication Office , FAA, Eng i ne & P r ope ll e r D i rectorate, 12 New Eng land Exec u t ive P ark, Bu rl i n g t on , MA 0 1 803; phone: 78 1 -238

- 71 05; fax: 78 1 -238- 7199 ; email: jo

- ann.the r iaul t @ faa.gov. SUPPL E MENTARY INFORMAT ION: C omm e nt s Invited We i nvite you to send any written relevant data, views , o r a r gume n ts about thi s N P RM. Se n d yo ur co mm e nts to a n address l isted under the AD D RESSES sect io n . Include " Docket No. F AA-20 14-1127; D i rectorate I dent i fier 20 14

- NE-16-AD " a t the begi n ni n g of your co mm e nt s . We spec i fica ll y i n vi t e co mm ents o n th e overa ll r eg ul atory, eco n om ic , env ironm ental , a n d e n e rgy aspec t s of this N PRM. We w ill conside r all 2c omm e nts r ece ive d b y the closin g dat e a nd ma y a mend this N PRM b eca u s e o f tho s e comment s . W e will p ost a ll commen ts w e rece ive , without change , to http: //www .reg ul a ti o n s.gov, includin g an y p e r so n a l inf o rmati o n yo u p rov id e . We w ill
a l s o p ost a report s umm ari z ing each s u bsta nti ve ve rb a l conta c t we rece ive a bo u t thi s N PRM
. 

### Discu ss ion W e rece ive d re port s of two LPT s ha n s with in-shop f indin gs o f f a ti g ue crack s o n th e No
. 4
. 5 b ea rin g thre ad und ercut adj a ce nt t o o il fe ed hol es . Th e c rac k s we re di scovered durin g ro utin e fluoresce nt p e ne tra nt in s p ec ti o n s . B oth s h afts had o il fee d hol e e nlar ge m e nt r ewo rk ac compli s he d. T he r oo t ca u se i s incr e a se d s tress o n th e fill e t o f th e tlu·ead und e r c ut r eg ion in f ront of the oi l fee d hol es caused by oil f eed hol e rework

. The incr e a se d s tress re du ces th e low c ycl e fa ti g u e li f e of the s h a ft. Thi s condition , if not
co rr ec t ed , co ul d res ul t in failure of th e LPT s h a n , w hich c o uld lea d to a n un co ntain e d
e n g in e fa i lu re and d a m age to the a i r p la ne. 

### Related Serv ic e Information under 1 CFR Part 51 We r ev iewe d PW Servic e Bull e tin (S B) No. JT8D 650 4 , d a t e d No v ember 5 , 201 4
. T he SB conta in s a dditional inform a ti o n reg ardin g re moval of th e LPT s h a ft. Th i s s e rvic e inf o rmati o n i s reaso n a bl y ava ilabl e; see A DDRE S SES for ways to access thi s se rvi ce inf o rm at io n . 

### FAA ' s Determination W e ar e pr o p os in g this NPRM b ecau se w e e v aluate d all th e re lev ant information and det e rmin e d th e un s afe condi tion d es cr ib e d pre v iously i s lik e ly to ex i s t or develop in
o ther pr o du c t s o f th e s am e t y p e d es ig n . 

### Proposed AD Rcquir·ements Thi s N PR M woul d re quire r e m ov in g af f ec ted LP T s h afts f r o m se rv ice. 

### 3

### Cos t s of Comp li ance We es tim a te that this propo sed AD would affect about 744 e n g in es in sta ll ed on a irpl anes of U.S. regis try . The average labo r rat e i s $85 per h our. W e estimate the pror ated rep laceme nt cost wo uld be $28,230. We a l so estim ate that s h aft r e pl ace m e nt wou ld be accompl i s hed during a n e n g i ne s h op visit at no a d ditional labor cost. B ased on these fi g u res , we es t imate th e cost of th e proposed A D on U .S. ope rators t o be $2 1 , 003 , 120. A u tho ri ty for t hi s R ul ema kin g Titl e 4 9 of the United States Code s p e cifies the FAA 's a uth o rit y to issue rul es on aviati on safety

. Sub titl e 

### l , sectio n I 06 , de sc ribe s the autho ri ty of the FAA A dministrato r. S ubtitl e V II : Avia ti on Programs , d escribes in more d e tail th e scope of th e Agency 's
a uthority . W e a r e i ss uin g thi s rul emak in g und e r th e a uthority d esc rib ed in S ubtitl e 

### VII , Part A , S ubp ar t III , Section 44701 : "Ge n e ra l re qu ire m e nts
. " Under that sec ti on, Congress cha r ges th e 

## r: AA w ith pr omotin g safe ili g ht of civ il aircraft in a ir commerce by prescrib ing r egu latio n s for practic es me th o d s, a nd procedure s the Administra to r fi nd s
necessary fo r sa f e ty in ai r commerce. Thi s regu lation i s w ithin the scope of that authority becau se it addresses a n un sa f e co nditi on th a t is likely to ex i s t or d eve lop o n product s id entifi e d in thi s rul e m akin g action. Regu latory F ind ings We determined th at this p roposed AD wou ld not ha ve federalism implication s under Executive Order 13132. T hi s propos e d AD would n ot h ave a subs t an ti a l direct effect on th e S t a t es, on the rel at ion ship be t ween the nati o nal Gove rnm e nt a nd th e States,
or o n th e di s tr ibu t io n of power and r espons ibiliti es among th e va r i o u s leve l s of governm e nt. Fo r the reasons discussed above , I cert i fy this propo sed regulation: (1) I s n o t a ' · sign ificant regulatory ac tion " under Executive Order 1 2 86 6, 

### 4(2) Is not a "s ig nificant rul e" und e r th e DOT Re g u latory Po li c ies and Procedur es (44 F R I I 034, Feb ruary 26, 1 979), (3) Will not affect intrastate a via tion in A laska to th e ex tent th at it ju s ti fies
m ak in g a r eb

rulatory distinction , a nd ( 4 ) Wi ll n o t have a s ignificant eco n o mi c impact , po s iti ve or n ega tive , on a
s ub s tanti a l numb e r of s mall entities und e r th e c rite ri a of the Reg ulato r y Flexibility Act. List of S ubj ects in 14 CFR P art 39 A ir transportation , Aircraft, Aviat ion sa f e ty , In corporat ion b y reference , Safety. T h e Propo se d Amendme nt Acco rdin g ly, under the authority de legated to m e by th e Administrator, th e FAA p roposes to ame nd 14 CFR part 39 

### as fo ll ows: PART 39

- A IRWORT HINESS DIRECT I VES I. Th e au th o rity citation for part 39 conti nu es to re ad as follows : Autho ri ty: 49 U .S.C. 106(g) , 40113 ,4 4701. 

### § 39.13 !Amended] 2. Th e FAA amends§ 39.13 b y addin g the fo ll ow in g new a ir wort hin ess directive ( AD): I>ratt & Whitney : Docket No. F AA-20 14-11 2 7 ; Directorate I de ntifi er 20 14-NE-16-AD. (a) Co mm e nt s Du e Date We mu s t receive comments b y (IN SE RT OJ\ T E 60 DAYS AFTER DATE OF P UB LI CA T ION IN THE Fed era l Register]. (b) Affected A D s No n e. (c) A ppli cabi li ty Thi s AD app li es to a ll Pratt & Whitney ( PW ) J T80-2 17 C a nd JT80- 2 1 9 turbof an
e n g in es w ith low-p ress ure turbine (LPT) s h aft part numb e rs 783319 , 783319-001 , 

### 5783319-003 , 78 33 19-004 , 783320,783320-001 , 783320-003 , 783320-004,820514-001 , 820514-003, 8205 1 4-004, or 820514-00 5, insta ll ed
. ( d ) U n safe Con d it i o n Thi s AD was prompted by report s of c r ack in g in the L P T s haft. We are issuing this AD to pr eve nt fa il ure of the LPT s h aft, which cou ld lead to a n uncontained engi ne fa ilur e and dama ge to the airplane. 

### (c) C ompli a n ce Comply w ith thi s AD within the co mplianc e times spec if i ed , un less a l rea dy done. for engi nes wi th an LPT shaft part number li s ted in paragraph (c) of this A D: ( I) Tf th e LPT s haft has 1 5 , 000 o r fewer cycles s ince new (CSN) on the effec tive d ate of this AD , remove it from serv ice b efo re it accu mulates 20 , 000 CSN. (2) If th e L PT s haft has more th a n 1 5,00 0 CSN on th e effect ive date of t hi s AD,
r e mo ve it from se rv i ce before i t accumulat es 5 , 000 add itiona l cyc les in se rv ice, or at t he next piece-part expos ure after accumulatin g 20 , 000 CSN , wh ichever occ ur s first. (3) Afte r the effective d a te of th i s A D , do not install any LP T s haft li s ted in paragraph (c) of thi s AD that is at piece-part exposure and exceeds the new lif e limit of 20 , 000 CSN , into a ny engine. (f) D efi ni ti o ns Fo r th e p urp ose of this A D , piece-part expos ure is when the LPT shaft i s co mpl ete ly d i sasse m bled from the engine. (g) A l ter n at ive Me th o d s o f C ompli a n c e (AM O Cs) T h e Manager, E ngine Certification Office , FAA , may ap prove AMOCs for thi s AD. Use th e proce dures found in 14 

### CFR 39. 19 to make your re qu es t. You may email your req u est to: ANE-AD-AMOC @ faa.gov.



### 6(h) Related Information (I) For mor e information about thi s /\0 , contact Jo-Ann The ri a ult , Aerospace Eng in ee r , En g in e Ce rtification Office , FAA , E n g in e & Prop e ll e r Dir ec t o ra te, 12 New E n gla nd Exec uti ve Park , Burlin gton, MA 0 18 03; phone: 781-238-7105 ; fax: 781-238- 7199 ; ema il : jo-ann.th eriault@faa.gov. (2) PW Se rv ice Bull e tin No. JT 8 D 6504, dated Nove m ber 5, 20 14, w hich i s not incorporated by refe r e nce in this p r oposed AD , can be obtained f rom PW using the contact in fo rm ation in paragraph (h)(3) o f th i s proposed A D
. (3) Fo r se rvice info rmati on id enti-fied in thi s prop osed A D , con tact Pratt & Whitney , 400 Main St. , East Hartf ord, CT 061 08 ; phone: 860-565-8770 ; f ax: 860

- 565

- 4503
. ( 4) Y o u m ay v iew this se r v i ce inf o rmation at the FAA, E n g in e & Prop e ller Dir ec t orate , 12 New England Exec uti ve P a rk , Burlin gton, MA. For in fo rmation on th e ava il ability ofthi s material at th e FAA, ca ll 78 1 -238-7 1 25.

I ssue d in Burlin gto n , Massac hu set t s, on F eb ru a ry 20, 20 15
.

Colleen M. D ' A lessa ndro , Ass i s tant Dir ecto ra te Manager , En g in e 

### & Propelle r Dir ec t o ra t e, A irc raft Cert i-fi cat ion Serv ice.



### 7