D EPA RTM E NT OF TRANSP ORT AT ION Federal Av iati o n Ad mini stration 14 CFR Part 39 [Docket No

. FAA -2014-0164 ; Directorate Id entifier 2014-NE-02 -AD ] RIN 2120-AA64 Ainvorthiness Directives; Turbomeca S .A. Turboshaft Engines AGENCY: Federa l Av iat ion A dmini st rati on (FAA), DOT. ACTION: Notice of proposed rul emaki ng (N PRM ). [491 0-13-P)

SUMMARY: We propose t o s u pe rsede airworthi ness d i rect ive (A D ) 201 4-1 9-05 th at applies to a ll T urb omeca S.A. Arriel I A I , l A2, 1B , 1 C, 1 C 1 , l C2 , l D , l D l , I E2, l K 1 , 1

S, 1 S 1 , 2 B , 20 l , 2C, 2C 1 , 2C2 , 2S I, and 2S2 turboshaft eng in es. A D 2 014-19-05 requi res an initial one-tim e v ibration c heck o f the eng in e acc essory gearb ox (AGB ) on certa i n higher risk Ar riel l and A rri e l 2 model e n g ine s a nd repetiti ve v i bration checks for all Arriel 1 and A tT ie I 2 engines. S ince we issued A D 20 1 4 -1 9-05 , we dete rmin ed that a Te chnic a l Instruction (T I) number a nd a Test B ed Acceptan ce Test Specifica tion s numb e r in th e Actions and Co mpli ance a nd th e Related Information sec tion s are i ncorrect. T hi s proposed AD wo uld co rr ect these numb ers . We ar c proposing this AD to preve nt fa ilur e of the eng in e AGB , wh ich cou ld lead to in-flight sh utd own and damage to the engine , whic h may result in damage to the aircraft. DAT ES: We must receive comments on this proposed A D by [ I NSE RT D AT E 60 DAY S AFTER DATE OF P UBLICAT I ON TN THE FE D ERAL R EG IS TER]. ADDRESSE S : Yo u ma y se nd comments , u s in g th e proc edures fo und in 14 CF R 1 1.43
a nd 11.45 , by any of the following methods:

• Fede ral e Rule mak in g P ortal : Go to http: //www.regulatio n s.gov. F o ll ow th e instructions f or subm i tt i ng comments.• Fax: 202-493

- 225 1.

• Ma il : U.S. Department ofTran s por tation , Docket Operation s , M-30 , West Buildin g Ground F loor , Room W1 2 -140 , 1200 New Jersey Av e nu e SE., Wa s hington , D C 20590.

• Hand De li very: Deliv er to Mai l address abo ve between 9 a .m . and 5 p.m. , Monday throu g h Frid ay, except Fede ra l h o li days. For se rvi ce infonnation identified in th i s AD , contact Turbom e ca , S.A

. , 40220 Tarnos , Franc e; phone: 33 0 5 59 74 40 00; t e lex: 570 042; fax: 33 0 5 59 74 45 15. You
may view this se rv ice information at the FAA , E ngin e & Pro p e ll er Directorate , 12 New England Exec uti ve Park , Burl ington , M A. F o r inf o 1mation on the availab il ity of thi s material at the FA /\ , ca ll 781-238-7125. 

### Examining t he AD Do cket You m ay examine the AD docke t on th e Internet at http: //www .r eg ulations.go v by
search ing f o r and locating Docke t No. F/\/\-20 14-0164 ; or in per s on at th e D oc ket M anageme nt Faci lit y betwee n 9 a. m. and 5 p.m. , Monday through Friday , except Federal holidays. The AD docket conta in s thi s proposed AD, the mandato ry co ntinuin g airworthine ss jnformat ion , regulatory eva lu ation, any comment s rec e iv e d , and other information. Th e add ress fo r the Docket Office (phone: 800-647-5 52 7) is in the ADDRESSES sec ti o n. Comments w ill be ava il able in th e AD do c ke t s hortl y afte r receipt. 

### F OR FU RTH ER INFORMAT IO N CONTACT: Mark Ri ley , Aerospace Engineer , E ngin e Certifi cati o n Offic e , FAA , E ng in e & Propeller D i rectorat e , I2 New England Executive Park , Bu rlin gton, MA 01803 ; phone: 78 1-238-7758; fax: 781-238 -7199 ; e mail : mark.riley @ faa.gov.

2

### SU PPL EMENTA RY I NF ORM AT IO N : C omm e nts In v ite d We invite you t o send any written relevant data , views, or arguments about this proposed A D

. Send your comments to an address li s ted under the ADDRESSES section. Includ e " Docket No. FAA -2014

- 0164; Di recto rat e Identifi e r 2014

-NE-02-A D " at the b eg inning of your comments. We spec ifically invite comments on the overall regulatory , econom ic, e n v i ro nme nta l , a nd e nergy aspects of this proposed AD

. We will cons ide r a ll comments received b y the closing date and may amend thi s proposed AD because of those comments. We will po s t a ll comments we rece ive , without change, to http: //www.regu lations.gov, including any personal informat ion you p rovide. We will also post a report summarizing each subs tantive ve rb a l contact we recei ve about this propose d AD. 

### Di s cu ss ion On September 15 , 2014, we i ss ued AD 2014-19-05 , Amendment 39 -17973 (79 FR59091,0ctober 1 ,2 014 ), forallTurbomecaS.A.Arriel i Al, 1A2, 18 , IC, l Cl , 1C2 , lD, I 0 1 , 1E2 , l KI, I S, IS 1 , 2B, 2B I , 2C, 2C 1 , 2C2, 2S I , a nd 2S2 turboshaft eng ines. AD 2014- 1 9

- 05 requires an initial one-time vibration check ofthe engine AGB on certain higher risk Arriel 1 and Ar r iel 2 mod e l e n gi n es. AD 2014 -19-05 also requires repetit ive vibration checks of th e engine AGB for all Arriel 1 and Arric l 2 eng ine s at every engine shop visi t. AD 2014- 19-05 res ul ted from reports of u n commanded in

- · flight s hutdown s on Turbomeca S.A. Arriel 1 and Arrie l 2 engi nes, following rupture of th e 41-tooth gear forming prut of the 41 / 23-tooth be ve l gea r located in the engine AGB. We issued AD 20 14-19-05 to p r eve nt fai lure of th e engine AGB , w hi c h co uld lead to in-flight s hu tdow n
a nd damage to the e ngin e, which may re s u lt in dama ge to the aircraft.



### 3Actions Since AO 2014-19-05 Was I ssued Sinc e w e i ss ued AD 2014-19-05 , Am e ndm e nt 39-1797 3 (7 9 FR 59091 , Octob e r 1 , 20 14 ), we d e t e rmin e d that a TJ numb e r a nd a T es t B e d Ac cep t a n ce T es t S pecific ati o n s number i n th e Ac ti o n s and C omplian ce a nd th e R e la te d In formati o n sec ti o n s are inc o rrec t. Thi s propose d AD wo uld correc t th ese numb e r s. Relevant Se n r ice Information We r e vi e w e d Turbomeca S .A Mandator y Service Bull e tin ( M S B) No

. 292 72 0839 , V e r s i o n B, d a te d Nove mber 25 , 2 01 3 , a nd MSB N o . 292 72 2 84 9 , V e r s ion B , date d Nove mb e r 25 , 20 1 3. T h e ser v ic e inf o rm at io n d esc rib es proce dur es f o r p e rf o rmin g
v ib ration checks of th e e n g in e A GB. FAA's Determination W e are propo s ing this AD b ec a u se w e e v aluated all th e rel eva nt information and determin e d th e un saf e condition d esc rib ed prev io u s ly is lik e ly to ex i s t o r d e velop in oth e r product s of th e sam e t y p e de s ig n. Proposed AD Requirements T hi s pro p osed A D wo uld r e quire a n ini t i a l on e -time v ibrat io n c h e ck o f the e n g in e AGB on c e rta in hi g h e r risk Arri e l I and A rri e l 2 model engin es . Thi s AD also requires
r e petitiv e v ibra tion c heck s of the en g in e AG B for all Arriel 1 a nd A rri e l 2 e n g in e s at
every e n g in e s h o p v i s it. Costs of Compl ia n ce W e es tim a t e tha t th is p ro po sed A D wo uld a ffe c t I ,268 e n g in es in s t a ll e d o n aircraft of U .S. reg i s try
. We also e s tim a t e th a t it would take about 4 h o urs pe r engine to
c ompl y with th e in s p ec tion require m e nt in thi s pro po s ed AD. Th e ave ra ge labor rat e i s $ 85 per h o ur. Base d o n th ese fi g ures , we es tim ate th e cost of thi s pro p ose d A D on U.S.

o p e rator s to b e $43 1 , 120

.

4A u th o ri ty for t hi s R ul cmaking Title 49 of the United States Code specifies the FAA's authority to issue rules on
av iation safety

. Subti tle I, Section l 06 , describes the authority of the FAA Administrator. Subtitle VII , Aviation Programs, describes in more detail the scope of the Agency's authority. We are issu ing this ru l emaking under the authority described in Subtitle 

### Vll , Part A, Subpart III , Section 4470 I , " Genera l requirements." Under that section, Congress charges the FAA with promoting safe · flight of civ il ai rcraft in air commerce by prescribing regulations for practices, methods , and procedures the Adm in istrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because i t addresses an unsafe condition that is li kely to exist or deve lop on products identified in this rulemak ing action. Reg ul a tory F in d i ngs We have determ ined that this proposed AD wou ld not have federalism implications under Executive Order 13132. This proposed AD would not have a substantial direct effect on the States , on the relationship between the national Government and the States, or on the d istribution of power and respons ibilities among the various levels of government. For the reasons discussed above, I certify that the proposed regulation: (1) Is not a "sign ificant regu latory action" under Executive Order 12866, (2) Is not a "s it,'ll ificant rule " under the DOT Regulatory Policies and Procedures (44 FR 11034 , February 26 , 1 979) , (3) Wi II not affect intrastate av iation in A laska to the extent that it justifies making a regulatory distinction , and (4) Will not have a s i gnificant economic impact, pos i t ive or negat ive , on a substantial number of small ent ities under the c riteria of the Regulatory Flexibility Act. 

### 5L ist of S ubj ects in 

### 1 4 CF R Pa r t 39 Air trans port ation , A ir c raft , Aviation safety , Incorporation by reference , Safety. Th e Pr o p ose d Am e ndm e nt Accordingly , under the au th o ri ty delegated to me by the Adm ini st rato r, the fAA proposes to amend 14 C F R pa rt 39 as follows: 

### P ART 3 9 

### -AI RWO RT HI NESS DIRECT I VES I. The authority c itation fo r part 39 continues to read a s fo ll ows : Au th ority: 49 U.S.C. I 06(g) , 40113 , 44701. 

### § 39. 13 [A m en d e dj 2. Th e FAA amends§ 39.13 by removing a irwo rthin ess directive (AD) 20 14-19-05 , Amendment 39-17973 (79 FR 5909I, October I , 20 14) , and adding the fo ll owi ng new A D: T urbo m ec a S.A .: Docket No. FAA-20 14-0 164 ; Dir ecto rate Id e ntifier 20 14-NE-02-A D. (a) Co mm e n ts Du e D ate We must recei ve comments by [INSERT DATE 60 DAY S AFTER DATE OF PUBLICAT ION IN THE FED ERAL REGISTER]. (b) Aff e cted A D s Thi s AD supersedes AD 20 14-19-0 5 , Amendme nt 39-17973 (79 F R 5909I , October 1 , 2014). (c) A ppli ca bili ty This AD applies to all Turbomeca S.A

. Arriel tAl , lA 2 , lB , 1C , I C l , IC 2 , 

### 10, 1



### 0 I , 1 E2 , I K l , 1 S , IS I , 2 B , 2B I , 2C, 2C 1 , 2C2 , 2S I , and 2S2 turboshaft eng in es. (d) Un safc Co ndi tion This AD was prompted by repo rt s of uncomm a nded in-fli g ht shu td owns on Turbomeca S.A. Aniel I and Arriel 2 engines following mpture o f the 41-tooth gear fonning part of the 41 /23- tooth bevel gear located in th e engine accessory gea rbo x 

### 6(A GB). We are i ss uin g this AD t o pr eve nt failure of th e eng ine AGB , w hi c h co uld le ad to in-fli g ht s hutd ow n and damage to the engi ne, which may r es ult in damag e to the a ir c raft. (e) 

### Compliance Comply wi th thi s AD within th e comp li ance tim es s pecifi e d , unl ess already done. ( I ) Fo r a ll Turbomeca S .A. Arriel I B , I 

### 0 , I D I , 28 , a nd 2 8 I turbo s haft engines, perform a one- time vibration check ofthe A GB 41 / 23 -tooth bevel gear mes hing wi thin 32 mo nths of the effective elate of thj s AD , as follows: ( i) F or a ll Turbomeca S

. A. A ni el I B , I D , and 1 D I eng in es , excep t those e ngi ne s w ith an AGB in s tall e d with a se ri al numb er (S /N) li sted in Figure I ofTurbomeca S.A

. Mandatory Se r vice Bull etin ( M SB) No. 292 72 08 39, Version B , d ated November 25 , 2013 , u se paragraph s 6.A. throu g h 6.C. of Turbomeca S.A. MSB No. 292 72 08 39 , Version B , date d November 25 , 2 013 , to perform the vibration c hec k. Turbomeca S.A. MSB No

. 292 72 0839 refe rs to Turbomeca S.A. A niel l T echni ca l In st ru ction (Tl) No

. 292 72 0839 , Ve rs ion E, dated f e bruary 2 0 , 2014 , and Tu rb o meca S.A. Arri e l 1 TJ No. 292 72 0840 , Version A , dated Nove m be r 29,2013 , whic h yo u mu s t also u se to do th e v ibrat io n che c k. ( ii ) Th e re portin g r e quir e me nt s in paragraphs 6.A. ( I )(c), 6.A

. (2)(b) , and 6.B.(l)(c) and th e require me nt to return mo dul e MOl in paragraph 6.B.(2)(b).f. of Turbom e ca S.A. MSB No

. 292 72 0839 , Version 8 , dated Novemb e r 25 , 2 013 , are no t required by this AD. ( iii ) For all Turbomeca S. A. Arric l 28 and 28 1 engines, except tho se engines with
an AGB in s talled w ith an 

### SIN li s ted in F ig ure 1 of Turb o meca MSB No. 292 72 2849 , Vers i o n B , dated November 25 , 20 13 , u sc paragraphs 6.A. through 6 .C. ofTurbom eca S.A. M S 8 No. 292 7 2 2849, Ve rs ion 8, dated November 25, 2013 , to perform th e v ibrati o n check. Turbomeca S

. A

. MSB No. 292 72 2849 refers to Turb omeca S

. A. Aniel 2 T l No. 292 72 2 849 , Ve rsion 

### E , elated Feb ruary 20, 2014, and Turb omeca S.A. 

### 7Arriel 2 TT No. 292 72 2850, Version A , dated Nove mber 29, 2013, which yo u mu s t also u se to do the vibration check. (iv) The reporting requirements in paragraphs 6.A.(I)(c) , 6.A.(2)(b) , and 6.B.(l)(c), and the requireme nt to return module MOl in paragraph

**6.8.(2)(b)~** of Turbomeca S.A. MSB No. 292 72 2849, Version B , dated November 25,20 1 3, are not required by this AD. (2) Fo r all affected Turbomeca S.A. engines , during each engine shop visit after th e effec ti ve date ofthis AD, perform a vibratio n check of the AGB 41/23-tooth bevel gear meshing. (3) T ft he AG B does not pass the vibration check required by paragraphs (e)( l ) or (e)(2) of this AD , replace the AGB with a part e ligibl e for installation. (f) Cred it for P rev i ous Actio n If you performed a vibration check of the AG B before the effect ive date of this AD us ing Turbomeca S.A. MSB No. 292 72 0839, Version A, dated September 9 , 20 13; or MSB No. 292 72 2 84 9, Version A, dated September 9 , 20 13 , or during an engine shop vis it per paragraph (e)(2) of this AD , you met the initial in s pection requirem e n t of paragraph (e)(l) of this A D. (g) De finiti o n For the purpose of this AD , an "engi ne s hop visit" is the induction of an engine in to the sho p for m ainte nance involving the sepa rati on of pairs of major mating engine fl anges. The se paratio n of engine flanges so le ly for the purp ose o f transpottation w ith out s ubsequ e nt engine maintenance does not co nstit 1 1te an engi ne shop visit. (h ) A l te rn at ive Met h ods of Comp li a nce (AMOCs) The Manager, E n gi ne Certifi catio n Offic e, FAA, m ay approv e AMOCs for th is AD

. Use the procedures found in 1 4 CFR 39 .1 9 to make your requ est. You may email your request to: ANE

- AD-AMOC @ faa.gov.

### 8(i) Related Inform atio n (I) For more information a bout this AD, contact Mark Riley , A e ro s pace Eng in ee r, Engine Certification Office, FAA , Eng in e & Propeller Directorate , 12 New E ngland Executive Park , Burlingto n , MA 0 1803 ; phone : 781- 238-77 58; fax: 781

- 238 -719 9;
e mail: m ark. riley @ f aa.gov. (2) Re fer to M CA I Europ ea n Av iati o n Safety Agency A D 201 4-0 036 , dated February II , 2014 , for r e lated info rm ation. Yo u m ay exam in e the MCAI in the AD docket on the Internet at http: //www .r egu lati ons . gov/# !doc um e ntDetaii ; D = FAA-20 14- 0164-0003. (3) Turbomeca S.A. MSB No. 292 72 0839, Ver s io n B , dated November 25 , 20 1 3; and MSB No. 292 72 2849 , Version B , dated Nove mber 25 , 2013 , prov id e guidance on performin g the on e -tim e vibration c h ec k. Arr ie l I Techn ic al In s truction (TI) No. 292 72 0839 , Version E, dated Februar y 20 14; Arriel I T J No. 292 72 0840 , Version A, dated Nove mb e r 29 , 2 013 ; A rri e l 2 TI No. 292 72 2849 , Version E , dated Februar y 20 , 20 14 ; a nd AtTi e I 2 

### Tl No. 292 72 285 0 , Version A , dated November 29 , 20 13 , provid e detailed instructions on performing the one-ti me vib ration check for At-riel I and A rri el 2
e ngin es as indicated

. Turbomeca Eng in e Te s t Bed Accept a nce Test Specifications CCT No. 0292009400 , Version T ; CCT No

. 02920 19400 , Ve rsio n R; CCT No. 0292019690 , Version I ; CCT No. 02920 1 9530, Version K; CCT No

. 02920 19610 , Version K; CCT No. 0292029450 , V e rs io n 

### J; CCT No. 02920 29 490 , Vers ion I ; CCT No. 0 292 029440 , Ve rsio n I ; CCT No. 0292029480 , Vers ion K ; CCT No. 0292029520, Version H ; CCT N o. 0292029410 , Version L; CCT No. 02920 29530, Ve rs ion H ; or T urb o meca ID No. 383952 ; o r Turbom eca RTD No. X 292 65 327 2 , provide inf o rmati o n o n performing a vibrati on chec k during an engi ne s hop vis i t. T hese service documents , whic h are no t incorporate d by r efere nce in this AD , can be obta ined from Turbomeca S.A. using th e contact information in parag raph (i)(4) of this proposed AD. 

### 9(4) For service inform at ion ident ifi ed in this proposed AD , contact Turbomeca S.A., 40220 Tarnos, France; phone: 33 0 5 59 74 40 00 ; te l ex: 570 042; fax: 33 0 5 59 74 45 15. (5) You may v iew this serv ice information at the FAA , Engine 

### & Propeller Directorate , 12 New Eng land Execut ive Park , Burlington , MA. Fo r informati on on the avai labi li ty of thi s m ateria l at the FAA , call 781-238-7125.

Issued in Burl in gton, Ma ssac hu setts, o n J anuary 26 , 20 1 5.

Colleen M. D 'A i cssandro , Assis tant Directorate Manager, E ngine & Pr opeller D irectorate , Ai r craft Cert ifi cation Service

.

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