### DEPAR TMENT OF T RANS PORT AT IO N Federal Av i ation Administration 14 CFR Part 39 [Docket No. FAA- 2012-116 7; Directorate Identifier 2012-NE-36-AD] RIN 2120- AA64 [4910- 13

- P]

Ainvorthine ss Directives ; Roll s -Royce Deutsc hl and Ltd & Co KG Turbofan E n gines 

### AGENCY: Federal Av iation Admin i st ration ( f AA), DOT. 

### ACT IO N: Notice of pro p osed rulemaking (N PRM ). 

### SUMMARY: We propose to adopt a new airwo rthin ess direct ive (AD) for certain RollsRoyc e Deutsch la nd Ltd 

### & Co KG (RRD) mod e l s Tay 620-15 and Tay 650 -1 5 turbo fan
e n g in es. This proposed AD was prompted by RRD recalculating the Declared Safe C y clic L ife ( DS C L) for certain low-pressure compressor (L P C) rotor di sc assemb li es operating to the Plan D Fli ght M i ss ion. This proposed A D wo ul d requ i re remov ing the affected LPC rotor disc assemblies at a new lower recalcul ated DSCL. We are proposing this AD to prevent failur e of the LPC rotor d i sc assemb l y, un con t ain e d eng ine failure , and damage to th e airp lan e . 

### DATE S: We must recei ve comments on thi s proposed 

### AD by [inse rt date 60 days after date of publication in the FED E RAL REG ISTER]. 

### ADDRE SSES: You may se nd comments, u s in g the procedur es found in 14 CFR 11.43
a nd 11.4 5, by a n y of th e fo ll owi ng m ethods:

• Federal eRulemaking Portal: Go to http: //v."'v'w.regulat ions.gov and follow the instruction s for se ndin g yo ur comments e lec tron ically.• Mail: U.S. Department of Transportation , Docket Operations , M-30, West Building Ground Floor , Room Wl2-l40, 1200 New Jersey Avenue SE. , Washington , DC 20590.

• Hand Delivery: Deliver to Mail address above between 9 a.m. and 5 p .m. , Monday through Friday, except Federal holidays.

• Fax: 202-493-2251. For service information identified in this proposed AD , contact Rolls-Royce Deutschland Ltd & Co KG , Eschenweg 11-15827 Dahlewitz , Blankenfelde-Mahlow, Germany; phone: + 49 0 33 -7 086-1944 ; fax: +49 0 33

- 7086-3276. You may view this service information at the FAA , Engine & Propeller Directorate , 12 New England Executive Park , Burlington, MA 01803. For information on the availabi li ty of this material at the FAA, call781-238-7125. 

### Examini ng the AD Docket You may examine the AD docket on the Internet at http :// ww w . re Qulation s. go v;
or in person at the Docket Operations office between 9 a.m. and 5 p.m., Monday through Friday , except Federal holidays. The AD docket contains this proposed AD , the regu l atory evaluation, any comments received and other information. The street address for the Docket Operations office (phone: 800 647

- 5527) is the same as the Mail address provided in the ADDRESSES section. Comments will be available in the AD docket shortly aft e r receipt. 

### FOR FURTHER INFORMATION CONTACT: Frederick Zink , Aerospace Engineer, Engine Certification Office , FAA, Engin e 

### & Propeller Directorate , 12 New England


### 2Executive Park , Burlington, MA 01803; phone: 781-238-7779 ; fax: 781-238

- 7199;
e-mai l:**Frederick.zink @.** **~la gov.**  

### S UPPL E M E NT ARY IN F ORMATION : C omm e nt s Invite d We i nvite yo u to sen d any w ri tt en relevant data, v iews , or arguments about this proposed AD. Send you r comments to an address lis t ed under the ADDRESSES section. I ncl u d e "Docket No. FAA

- 2012- 1 167; Di r ecto rate Ide nti fier 2012-NE-36-AD" at the beginning of your comments. We specifically invite comme nts on the overall regulatory , economic , environmenta l , and energy aspects of this proposed AD. We will consider all comments received by the closing date and may amend this proposed AD based on thos e comments. We wi ll post a ll comments we receive , without change, to http: //v .rww. rcgulation s .gov, includin g any p e rso n a l information you provide. We will also post a report su mmariz ing each s ub s tantive ve rba l contact with FAA personnel concerning thi s proposed AD. Using the search function of the Web site , anyone can find and read the comme nt s in a ny of our d ockets , incl ud in g, i f provided , the name of th e indiv i dual who sent the comment (or signed the comment on beha l f of an association , busines s, labor union , etc.). You may r eview the D OT's comp lete Pri vacy Act Statement in the Fede ral Register published on April II , 2000 (65 FR 19477-78). 

### Discu ss ion The European Aviation Safety Agency (EASA), which i s the aviation a uthority for the Membe r States of the European Community , has issued EASA AD 2012

- 0204 ,


### 3dated October 1 , 2012 (referred to hereinafter as "the M CA I " ), to correc t an u nsa f e condition for the spec ified products. The MCAI s tates: The T ay 650-15 and Tay 650-15/10 eng in e Tim e Limit s Manual Chapter 05 -1 0-01 contains maximum approved lif e l imitations, ident i fied as D eclared Safe Cyclic L if e ( D SCL) for Low Pressure Compressor (LP C) roto r disc asse mblie s Part Number (PIN) JR31198A and 

### P IN JR34563A operated to the Pl an D F light Mission, which h as been recalculated to a lo wer value. Dec reased DSCL of LPC rotor disc assemb li es 

### PIN JR3 119 8A and 

### PIN JR34563A may affect these disc asse mbli es in stall e d in Tay 650 -1 5 and Tay 650-15110 engines as we ll as in Tay 620-15 and Tay 620-15/20 eng in es. Fail u re to take de creased DSCL of affected LPC rotor disc assemb l ies into account could lead to affected part failu re and consequent release of hi g h e nergy debris potentially resulting in damage to, and/or reduced co ntrol of, the ae rop lan e . You may obtain furth er in fom1at ion b y exa mining the MCAl in th e A D docket. 

### R elevant Service Information RRD has issued A le rt Service Bulletin TAY-72-A 1 772 da t ed August 9 , 2012. The action s desc r ibed in this serv ice infonnation are intended to correct the unsafe condition id entifi ed i n the MCA I. 

### FAA ' s Determination and Requirement s of This Proposed AD T h is product has been approved by the av iation authority of Germany, and is approved fo r operati on in the U ni ted States. Pursuant to ou r bi latera l agreement with the European Co mmunity , EASA h as n ot ifi ed u s of the unsafe condi ti on described in the MCA I a nd serv ic e information referen ce d abo ve. We are p r opos in g thi s A D because we
evaluated a ll information provided by EASA and determined the unsafe condition exists and is likely t o exist or develop on o th e r products of the same type des ign. This proposed

4AD requires removing the affected LPC rotor disc assemblies at the new lower
recalc ul ated DSCL. 

### Costs of Compliance We estimate that this propo sed AD will affect 4 engines in sta ll ed on airplanes of U.S. reg i stry. We also estimate that it woul d requi r e 4 hours to perform the act ions required by this AD
. The average labor rate i s $85 per hour. Prorated lif e for the disc assembly i s app r ox im a tely $ 650 per disc. Based on these figures , we estimate th e cost of the proposed AD on U.S. operators to be $3,960. 

### Authority for This Rulemaking Titl e 49 of the United States Code specifies the FAA 's a uthori ty to issue rules on aviat io n safety. S ubtitl e 1, section I 06, de sc ribes the authority of the FAA Admi ni strator. "S ubtitle V II : Aviat ion Programs ," de sc rib es in more d etail the scope of th e Agency's authority. We are issuing thi s rulemaking und e r the aut hority described i n " S u btitle VII, Part A, Subpart Jll , Section 44701: Gene ral requirements. " Under that section, Congress
c harges the FAA w ith promoting safe flight of c iv il aircraft in air comme rce by prescribing regulations for practices, methods , and p rocedures the Administrator finds
necessary for safety in a ir commerce. This regulation is within the scope of that authority because it add resses an unsafe condition that is likely to exist or develop on products identi fied in thi s ru lemaki ng action. 

### Regulatory Findings We dete rm ined that th i s proposed AD wo uld not have fede ra l ism implications under Execut ive Order 1 3132. T his proposed AD wou ld not have a substantial direct 5effect on the S tates, on the relation s hip between the national Governm e nt a nd the States , or on the distribut io n of power and r espo nsibilitie s a m ong the variou s leve ls of gove rnm ent. For the r easo n s discussed above, I certify thi s proposed regulation: 1
. I s no t a " s i g nificant re gu la to ry action " und er Executi v e Order 1 2 866 ; 2. Is not a " s i g nificant rul e " under the DOT R egu latory Poli c ies and Proce dures (44 FR 11034 , February 26, 1979) ; and 3. Will no t h ave a si gnifi cant econo mic imp ac t , positi ve or negati ve , on a substantial numb e r of s mall entities under the criteria of th e Regul ato ry Flexibility Act. We prepare d a regulatory eva lu ation of the estimated costs to comp ly with thi s p roposed AD and pl aced it in the AD docket. 

### List of Subjects in 14 CFR Part 39 Air tran spo rtation , Aircraft , Av iat ion safety, Incorporation b y r efere nce , Safety. 

### The Proposed Amendment Accordingly , under the a uth o rity delegated to me by the Admi ni strator, the FAA proposes to am e nd 14 CFR part 39 as fo ll ows: 

### PART 39 -AIRWORTHINESS DIRECTIVES I. The auth o ri ty citation fo r part 39 continues to read as follows: Authority: 49 U.S .C. 10 6(g), 40113 , 44701. 

### § 39.13 [Amended! 2
. The FAA amends§ 39. 1 3 by add ing the fo ll ow in g new AD: 

### Rolls-Royce Deutschland Ltd & 

### Co KG 

### (RRD) (formerly Rolls-Royce pic): Docket No. FAA

- 2012-1167 ; Director a te Id en tifi e r 2012-NE-36-AD. 

### 6

### (a) Co mm e nt s Du e Date We must receive comments by [insert date 60 days after date of publication in the FEDERAL REGISTER]
. 

### (b) Affected Ainvorthiness Directives (A Ds) None. (c) 

### Applicability This AD applies to Rolls-Royce Deutschland Ltd & Co KG (RRD) mode l s Tay 620-15 and Tay 650-15 turbofan engines with a low-press ur e comp ressor (LPC) rotor disc assembly, part number (PIN) JR31198A or PIN JR34563A installed. 

### (d) Reason Thi s A D was prompted by RRD recalculating the Declared Safe Cyclic Life for
cer t ain LPC rotor disc assemblies operating to the Plan D Flight Mission. We are issuing thi s AD to prevent failure of the LPC rotor d i sc as se mbly , un contained e n gine failure , and l oss of the airplane. 

### (e) Act i o ns and Co mpli a nce Un l ess a lready done , do the fo llo wi n g. For eng in es that have operated to the P l an D F li ght Mission configuration, remove the LPC rotor disc assembly from service before accumulating 18 , 700 engine flight cycles. Do not return to service nor approve for return to service any engine with the affected discs install ed that exceeds 18 ,700 engine flight cycles.



### 7

### (f) Alternative Methods of Complianc e (AMOC s ) T he Ma n age r , E ngi ne Ce rti fica ti o n Office, FA A , m ay app rove A MO Cs for thi s A D
. Use th e p r ocedu res found in 

### 1 4 C F R 39. 19 to m ak e yo ur reques t. 

### (g) Rela t ed Information (1) For more in f ormatio n abo ut this AD , cont act Fred e ri ck Z ink, Aerospace E n gi nee r , E ngi ne Ce rt ification Of fi ce , FAA , E ng ine 

### & Pro p e ll e r D irecto rate, 1 2 New E n g la nd Exec ut ive Park , Burlin gton , M A 0 1 8 0 3; e mail: F r c d crick.z in k @ faa
. gov; p hone: 7 8 1-238-7779 ; fax: 78 1 -238-7 1 99. (2) Refe r to European Aviatio n Safety Agency A D 20 12-0204, dated October 1 , 2012, an d RRD Ale rt Se rvice Bulletin T A Y-72-A 1 772, d a ted A u gus t 9 , 20 1 2, fo r re lated in fo rm a ti o n . (3) For se r v ice inf o rm a ti o n ide n ti f i ed i n thi s AD , co ntact Ro ll s-Royce D eutschland Ltd & Co KG , Esche nweg I I Dah lew it z 15827 , Blankenfe lde-Mah1ow , Germany ; phone: + 49 0 33

- 7086

- 1944 ; f ax: + 49 0 33

- 7086

- 3276. (4) You may v iew thi s se r v i

ce in fo rm at io n a t the F AA , Eng in e & Prope ll e r Di rec to rate , 1 2 New E n g la nd Exec uti ve P a rk , Burlin gton , M A . F o r in fon n at ion on th e avai l ab ility of this material at th e FAA , ca1178 1-238-7125. I ssued in Burli n ton , Massac h us e tts. on D ecember 6 , 2012.

R obe rt J. Ga nl ey, Ac t i ng Manager , En g in e & Pro p e ll e r D irectorate , Aircraft Ce r tificat io n Se r vice
.

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