### DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR P a rt 39 [4910-13-P]

[Docket No. 

### F AA-2015-3805; Dir ec tora te Identifier 2015-NE-28-AD; Amendment 39 -18389; AD 2016-03-021 RIN 2120-AA64 Ainvorthiness Directiv es; Turbomeca S.A. 

### T urbo s haft E n g ine s AGENCY: Fede ra l Aviation Administration (FAA), DOT. 

### ACTION: Final rule. 

### SUM MARY : We a r e adopt in g a new ai rwo rthin ess directive (AD) for a ll Turbomeca S.A
. ARRlEL 2C, 2Cl , 2C2 , 2S l , and 2S2 tu rboshaft engines with modificati on TU34 or TU34A installed. This AD requi r es inspect ing the torque conformation box (TCB) fo r correct r es i sta nce values and removing TCBs that fail in spect io n befo re further flight. This AD was prompted by TCB failures. We are i ssui ng thi s AD to preven t fa ilu re of th e TCB , loss of e ngin e thru st control , a n d damage to th e helicopt e r. 

### DATES: Th i s AD becomes effec t ive [INSERT D ATE 35 DAYS AFTE R DAT E OF P UBLICATION IN THE FE D ERAL REGI STE R]. The Director of th e Federa l R eg i ster approved the incorporation by refe rence of a
ce rtain pub li cation li s ted in this AD as of [INSERT DATE 35 DAYS AFTER DATE OF PUBLICATION IN THE FE D ERAL REGISTER]. 

### ADDRESSES: For se r v ice information id e ntifi ed in this AD , con t act T urb omeca S.A., 40220 Tarn os, France ; phone: 33 (0)5 59 74 40 00 ; fax: 33 (0)5 59 74 45 15. You may view this service in formation at the FAA, Eng in e & 

### Propell er Directorate, 1 200 District Avenue, Burlington , MA. For information on the ava il ab ili ty of this material at the FAA ,call 78 1 -238-7125. 

### It i s also availab le on the Internet at http: / / www .regu lat ions.gov by searching for and locating D ocket No. fAA-2015-3805. Examining the AD Docket Yo u may examine the AD do cke t o n th e In terne t at http:/ /www. rc g ulations. gov by searching for and locating Docket No. FAA -20 15- 3805 , or in pe r son at the Docket Management Fa cility between 9 a.m. and 5 p.m. , Mo n day through Friday , except Federal h olidays
. T he AD docket conta in s this AD , the mandatory conti nuin g ai rwo rthin ess information (MCAI) , the regu l atory evaluat ion , any commen t s rece ived , and o ther information
. The address for the Docket Office (phone: 800-647-5527) i s Docume n t Management Faci li ty , U.S
. Department ofT r ansportation , Docket Operations, M-30 , West Build in g G r ound floor , Room Wl2- 140, 1200 New J ersey Avenue SE., Washington, DC 20590. FOR FURTHER INFORM AT IO N CONTACT: Brian Kierstead , Aerospace Engineer , Eng in e Certificat ion Office, FAA , En gi n e & Propeller D irecto r ate, 1 200 D i s tri c t Avenue, Burlington , MA 01803; phone: 78 1 -238-7772; fax: 781-238-7199; email: b ri an.kie rstead @ faa.gov. SU PP LE MENTARY I NF ORMATION: Discussion We issued a notice of propo s ed r ulemaking (NP RM ) to amend 14 Cf R part 39 by adding an AD that would apply to the s pecified products. The NPRM was pub li s h ed in the Fe d era l Regist e r on November 5 , 20 1 5 (80 FR 68475)
. The NPRM proposed to
con· e ct an unsafe condition for the specified p roducts. The MCA I states: Several cases of torque confom1at ion box (TCB) fai lure s have been r eported on engi n es incorporating mod TU34 or mod TU34A. Inv es ti gat ion conc lu ded th at these failures were caused by c racks on so ldered joint s ofTCB resi stors.

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### C om m ents 

### Th is co nd it i o n , i f n o t corr ec t e d , co ul d lead t o limited power avai lab ili ty in a On e Engi ne I nope rat ive (OEI) case, possib ly resulting in red uced contro l ofthe helicop t er.

We g ave th e p u bl ic the oppo rtunity to p art i c ipa t e i n deve l o pi ng thi s A D
. We received no co m ments o n the N P RM (80 

### F R 68475, 

### November 5, 20 15). C o n cl u s i on 

### We r ev iewed th e ava il a bl e da ta and de t e rm ined tha t a ir safety and the publi c interest requ ire adopting this AD as propose d
. Re l ate d Se rv i c e I n formation u nd e r 1 CF R Pa rt 5 1 

### T u r b o meca S
. A. h as iss ued Ma nda to ry Se rv ice Bu ll e t in (MS B ) No. 292 

### 72 2860, 

### Ve rsio n A, dated J u ly 15,20 1 5
. 

### T he MSB desc ri bes p r ocedures for checki ng TCB resistance values. T h is service in forma tio n is reasonably available because the interested pa rties have access to it th r ough th e ir no rma l course of b u si ness or by the means ident i fie d in the ADD RESSES sect io n o r thi s fi na l rul e. C o s t s of C omp l iance 

### We estimate that this AD affects 300 

### engines installed on helicopters of U.S
. reg istry
. We es ti m ate t h at it wo uld take abo ut I hou r to perfo rm a n in s pect io n . We a lso esti r 11ate th at 20% 

### of these e ng in es would fa i l th e inspec tio n a nd r equire TCB remova l, which would take about I hour. T he average labor rate is $85 

### pe r hour. Based on t hese fig ures, we estima te the cost of this AD o n U.S
. ope r a t

ors to be $30,600. A u t h o ri ty for · T hi s R ul e m a kin g 

### T i tle 49 

### of the United States Code specifies the f AA's author ity to issue rules on aviation safety. Subtit le I, section 106 , 

### describes t he autho rity of the FAA Adm i nistrator. "Sub till e V II: Av ia tion Prog ram s," descr i bes in more de t ail th e s c o p e of th e Age n cy's authority.
3We are iss u i n g thi s ru lc m ak ing un de r t h e aut h o ri ty desc r ibed in " S u bt it le V II , P art A, Sub p art HI , Section 4470 1 : Gene r a l requ i reme n t s . " Under that sec tio n , Congress
c h arges the FAA w ith p r omot in g safe flig h t of c iv il a irc r aft i n a ir com m erce b y p rescrib in g reg u lat io n s fo r pra c ti ces , m e th o d s, and proced u r es th e A dmi n i s tra tor fin ds
n ecessary fo r safety in air co m merce. This reg u lation i s w i thin th e scop e of that a u thority because it addresses an u n safe con d it ion th at i s l i ke l y t o ex i s t or deve l op on prod ucts ide nt if i e d in thi s rul c m ak in g a c ti o n. 

### Re g ul atory F indin gs We determin e d that this AD w i ll not h ave federa li sm im plicat ion s u n de r Exec uti ve Order 13132
. Th i s A D wi ll n ot h ave a s u bs t an ti al direc t effect on th e S t a t es, on th e re la ti o n s hi p be twee n th e na ti o n al gove rnm e nt a nd th e States, o r on the d is tributi o n of power a n d respo n s ibili t ies a m ong the various levels of governme n t. For the reasons discussed above, I ce r tify th i s AD: ( I ) J s n ot a "s ig n ifi c a n t reg ul a to ry ac tion " un de r Exec uti ve O rd e r 1 2866, (2) Is not a "s ign ificant r ul e" under th e D OT Reg ul ato r y P olic ies and P rocedures (44 FR I I 034, Feb r uary 26, 1979) , (3) W ill no t affec t in tras tate avia ti o n in Alaska to th e exte n t th at it j us ti fies
m a ki ng a reg u lat ory d is tin ct i on, a n d (4) Will n ot have a s ign i ficant econom ic i mpact , positive or n egative, on a substanti a l num be r of sma ll e n ti ties un der th e c ri ter ia of the Regu lato ry F l exibility Act. 

### Li s t of S ub,i ects in 14 CF R Par t 39 Ai r tran spo r tat ion , Ai rc r aft , Aviat ion safety , Inco r pora t io n by reference , Safety
. 

### A d option of th e Am e nd m e n t Acco rd in g ly , und e r the a uth o ri ty de l egat ed to me by th e A dm ini s trato r , th e FAA amends 1 4 C F R part 39 as follows:

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### P ART 39- A I RWORTHINESS DIRECT IVES 1. T h e authority c i tat ion for part 39 continues to read as follow s: Authority: 49 U.S.C
. 106(g), 40 1 13 , 4470 1. 

### § 39.13 [A m e n de d ) 2. The FAA amends§ 39.13 by adding the follow in g new airwo rthin ess directive 

### ( AD ) : 2016-0 3 -02 T urb o m e c a S
. A.: Amendment 39- 18389; Docket No. F J\J\ -2 0 1 5-3805; Directorate Id e nti-fi er 2 015-NE-28-AD. 

### (a) E ffect ive Da te This AD becomes effective ( INSE RT DATE 35 D AYS AFTE R D A T E OF PUBLICATION I N THE F ED ERAL REG I STER]. 

### ( b) Aff ecte d ADs None. (c) 

### A ppli ca bili ty This A D ap pli es to Turbomeca S.A. ARRIE L 2C , 2C I , 2C2 , 2S I, and 2S2 turboshaft e n g in es w i th m odificati on TU34 or TU34A installed. 

### ( d) Re a so n Thi s AD was prompted b y torqu e conformation box (TCB) fai lur es. We are i ss uin g thi s AD to prevent fa ilur e of th e TCB , loss of e n g in e thru st co ntro l , and dam age to the helicopter. 

### (e) Act io n s a n d Co mplian ce Comply w ith this AD within the compliance t imes speci fi e d , unle ss already done. (I) Wit hi n 600 eng ine flight hour s (EF T

- Is) or 6 month s after the effective date of this AD , w hi c h eve r occ ur s first , c h eck th e r es i s ta n ce values on t he TCB. Use Accomp li shment In structions, paragraph 2 .3.2 ofTurbo m eca S.A. Ma n da t o r y Se r v ice

5Bu ll etin 292 72 2860, Ve r sion A, dated July 15 , 2015 , to do the inspecti o n. Repeat thi s inspection every 600 EFHs since last inspection. (2) Remove before further flight any TCB that fail s th e inspecti o n required by pa r ag r ap h (e)( I) of thi s A D. 

### ( f) A lt e rn a t ive Me th o d s o f C ompli a n ce (AM O Cs) The Manager , En gine Certification Office, FAA, may approve A MO Cs for thi s 

### AD. Use the procedure s found in 14 CFR 39.19 to mak e your request. You may ema i l your request to: ANE-AD

- AMOC @ faa.gov. (g) 

### Re l a t e d Inf o rm a ti o n ( 1 ) For more information about th i s AD, contact Br i an Kie r stead , Aerospace Enginee r , E n g i ne Cert i ficat io n Office, FAA , E n g i n e 

### & Propelle r D i recto r ate, 1200 Di strict Avenue , Burlingt on, MA 01803; phone: 78 1

- 238-7772; fax: 781-238-7199;
ema il: brian
. kiersteacl @ faa
. gov. (2) Refer to MCAI E uropean Avia tio n Safe t y Age n cy A D 2015-0 177, dated August 25,2 015 , for more information. You may examine the MCAI in the AD docket
o n the Internet at http: //www .regul at ions.gov by search in g for and locating Dock e t No. FAA-20 15

- 3805. 

### ( h ) Ma te ri a l Inc o rpor at ed 

### by Re f ere nce ( I ) The Dir ector of the Federal Reg i s ter approved the incorpo r ation by r eference ( 1BR) of the service information li s ted in thi s para g r a ph und er 5 U.S. C. 552(a) and 1 erR part 5 1
.(2) You must u se this service inf o rmation as applicable to do th e act ions required by this AD, u nless th e AD specifies o th erw i se . ( i

) Tu r bom eca S.A. Mandatory Service Bulletin No
. 292 72 2860 , Version A, dated July 1 5 ,20 15. (i i) Reserved. 

### 6(3) f-or Turbomeca S.A. service i n formatio n identifi ed in thi s AD , contact Tu rbomec a S.A. , 40220 Tarnos , France; phone: 33 (0)5 59 74 40 00; fax : 33 (0)5 59 74 

### 45 15
. (4) You may view th i s service info rmation at FAA, Engine 

### & Propeller Directorate, 1 200 Dist ri ct Ave nu e, Burlington , MA. For i nformation on the availability of this material at th e FAA, call 781-238-7 1 25. (5) You may view t his service information at the National Archives and Record s Administra ti on 

### (NARA). For information o n the avai labilit y of thi s material at NARA, call 202

- 741-6030 , or go to: http: //ww w.archives.gov/ federal-register/c fr / ibrlocat ions.htrn l.

Issued in B u rli n g to n , Massachusetts, on f-ebr ua ry 2, 2016.

Colleen M. D"Aicssand ro, Manager , Eng i ne 

### & Propeller Directorate. A ircraft Ce rtifi ca ti on Se r vice
.



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