DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA-2012-1167; Directorate Identifier 2012-NE-36-AD] 

RIN 2120-AA64 

[4910-13-P] 

Ainvorthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Turbofan Engines 

AGENCY: Federal Aviation Administration (f AA), DOT. 

ACTION: Notice of proposed rulemaking (NPRM). 

SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain RollsRoyce Deutschland Ltd & Co KG (RRD) models Tay 620-15 and Tay 650-1 5 turbofan 

engines. This proposed AD was prompted by RRD recalculating the Declared Safe 

Cyclic Life (DSCL) for certain low-pressure compressor (LPC) rotor disc assemblies 

operating to the Plan D Flight Mission. This proposed AD would require removing the 

affected LPC rotor disc assemblies at a new lower recalculated DSCL. We are proposing 

this AD to prevent failure of the LPC rotor disc assembly, uncontained engine failure, 

and damage to the airplane. 

DATES: We must receive comments on this proposed AD by [insert date 60 days after 

date of publication in the FEDERAL 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 eRulemaking Portal: Go to http://v."'v'w.regulations.gov and follow the 

instructions for sending your comments electronically. 
• 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 33-7086-1944; 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 availability of this 

material at the FAA, call781-238-7125. 

Examining the AD Docket 

You may examine the AD docket on the Internet at http://www.reQulations.gov; 

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 

regulatory 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 after receipt. 

FOR FURTHER INFORMATION CONTACT: Frederick Zink, Aerospace Engineer, 

Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New England 

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Executive Park, Burlington, MA 01803; phone: 781-238-7779; fax: 781-238-7199; 

e-mail: Frederick.zink@. ~la gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

We invite you to send any written relevant data, views, or arguments about this 

proposed AD. Send your comments to an address listed under the ADDRESSES section. 

Include "Docket No. FAA-2012- 1167; Directorate Identifier 2012-NE-36-AD" at the 

beginning of your comments. We specifically invite comments on the overall regulatory, 

economic, environmental, 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 those 

comments. 

We wi ll post all comments we receive, without change, to 

http://v.rww.rcgulations.gov, including any personal information you provide. We will 

also post a report summarizing each substantive verbal contact with FAA personnel 

concerning this proposed AD. Using the search function of the Web site, anyone can find 

and read the comments in any of our dockets, including, if provided, the name of the 

individual who sent the comment (or signed the comment on behalf of an association, 

business, labor union, etc.). You may review the DOT's complete Privacy Act Statement 

in the Federal Register published on April II , 2000 (65 FR 19477-78). 

Discussion 

The European Aviation Safety Agency (EASA), which is the aviation authority 

for the Member States of the European Community, has issued EASA AD 2012-0204, 

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dated October 1, 2012 (referred to hereinafter as "the MCAI"), to correct an unsafe 

condition for the specified products. The MCAI states: 

The Tay 650-15 and Tay 650-15/10 engine Time Limits Manual 

Chapter 05-1 0-01 contains maximum approved life limitations, 

identified as Declared Safe Cyclic Life (DSCL) for Low Pressure 

Compressor (LPC) rotor disc assemblies Part Number (PIN) 

JR31198A and PIN JR34563A operated to the Plan D Flight 

Mission, which has been recalculated to a lower value. 

Decreased DSCL of LPC rotor disc assemblies PIN JR3 1198A and 

PIN JR34563A may affect these disc assemblies installed in 

Tay 650-1 5 and Tay 650-15110 engines as well as in Tay 620-15 

and Tay 620-15/20 engines. 

Failure to take decreased DSCL of affected LPC rotor disc 

assemblies into account could lead to affected part failure and 

consequent release of high energy debris potentially resulting in 

damage to, and/or reduced control of, the aeroplane. 

You may obtain further infom1ation by examining the MCAl in the AD docket. 

Relevant Service Information 

RRD has issued Alert Service Bulletin TAY-72-A1772 dated August 9, 2012. The 

actions described in this service infonnation are intended to correct the unsafe condition 

identified in the MCAI. 

FAA's Determination and Requirements of This Proposed AD 

This product has been approved by the aviation authority of Germany, and is 

approved for operation in the United States. Pursuant to our bilateral agreement with the 

European Community, EASA has notified us of the unsafe condition described in the 

MCAI and service information referenced above. We are proposing this AD because we 

evaluated all information provided by EASA and determined the unsafe condition exists 

and is likely to exist or develop on other products of the same type design. This proposed 

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AD requires removing the affected LPC rotor disc assemblies at the new lower 

recalculated DSCL. 

Costs of Compliance 

We estimate that this proposed AD will affect 4 engines installed on airplanes of 

U.S. registry. We also estimate that it would require 4 hours to perform the actions 

required by this AD. The average labor rate is $85 per hour. Prorated life for the disc 

assembly is approximately $650 per disc. Based on these figures, we estimate the cost of 

the proposed AD on U.S. operators to be $3,960. 

Authority for This Rulemaking 

Title 49 of the United States Code specifies the FAA's authority to issue rules on 

aviation safety. Subtitle 1, section I 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 issuing this rulemaking under the authority described in "Subtitle VII, 

Part A, Subpart Jll, Section 44701: General requirements." Under that section, Congress 

charges the FAA with promoting safe flight of civil aircraft in air commerce by 

prescribing regulations for practices, methods, and procedures the Administrator finds 

necessary for safety in air commerce. This regulation is within the scope of that authority 

because it addresses an unsafe condition that is likely to exist or develop on products 

identified in this rulemaking action. 

Regulatory Findings 

We determined that this proposed AD would not have federalism implications 

under Executive Order 13132. This proposed AD would not have a substantial direct 

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effect on the States, on the relationship between the national Government and the States, 

or on the distribution of power and responsibilities among the various levels of 

government. 

For the reasons discussed above, I certify this proposed regulation: 

1. Is not a "significant regulatory action" under Executive Order 12866; 

2. Is not a "significant rule" under the DOT Regulatory Policies and Procedures 

(44 FR 11034, February 26, 1979); and 

3. Will not have a significant economic impact, positive or negative, on a 

substantial number of small entities under the criteria of the Regulatory Flexibility Act. 

We prepared a regulatory evaluation of the estimated costs to comply with this 

proposed AD and placed it in the AD docket. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. 

The Proposed Amendment 

Accordingly, under the authority delegated to me by the Administrator, the FAA 

proposes to amend 14 CFR part 39 as follows: 

PART 39 -AIRWORTHINESS DIRECTIVES 

I. The authority citation for part 39 continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended! 

2. The FAA amends§ 39. 13 by adding the following new AD: 

Rolls-Royce Deutschland Ltd & Co KG (RRD) (formerly Rolls-Royce pic): Docket 

No. FAA-2012-1167; Directorate Identifier 2012-NE-36-AD. 

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(a) Comments Due Date 

We must receive comments by [insert date 60 days after date of publication in the 

FEDERAL REGISTER]. 

(b) Affected Ainvorthiness Directives (ADs) 

None. 

(c) Applicability 

This AD applies to Rolls-Royce Deutschland Ltd & Co KG (RRD) models Tay 

620-15 and Tay 650-15 turbofan engines with a low-pressure compressor (LPC) rotor 

disc assembly, part number (PIN) JR31198A or PIN JR34563A installed. 

(d) Reason 

This AD was prompted by RRD recalculating the Declared Safe Cyclic Life for 

certain LPC rotor disc assemblies operating to the Plan D Flight Mission. We are issuing 

this AD to prevent failure of the LPC rotor disc assembly, uncontained engine failure, 

and loss of the airplane. 

(e) Actions and Compliance 

Unless already done, do the following. For engines that have operated to the Plan 

D Flight 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 installed that exceeds 18,700 engine flight 

cycles. 

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(f) Alternative Methods of Compliance (AMOCs) 

The Manager, Engine Certification Office, FAA, may approve AMOCs for this 

AD. Use the procedures found in 14 CFR 39. 19 to make your request. 

(g) Related Information 

(1) For more information about this AD, contact Frederick Zink, Aerospace 

Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New 

England Executive Park, Burlington, MA 0 1803; e mail: Frcdcrick.zink@faa.gov; phone: 

78 1-238-7779; fax: 78 1-238-7199. 

(2) Refer to European Aviation Safety Agency AD 20 12-0204, dated October 1, 

2012, and RRD Alert Service Bulletin T A Y -72-A 1772, dated August 9, 2012, for related 

information. 

(3) For service information identified in this AD, contact Rolls-Royce 

Deutschland Ltd & Co KG, Eschenweg I I Dahlewitz 15827, Blankenfelde-Mah1ow, 

Germany; phone: +49 0 33-7086-1944; fax: +49 0 33-7086-3276. 

(4) You may view this service information at the FAA, Engine & Propeller 

Directorate, 12 New England Executive Park, Burlington, MA. For infonn ation on the 

availability of this material at the FAA, ca11781-238-7125. 

Issued in Burlin ton, Massachusetts. on December 6, 2012. 

Robert J. Ganley, 

Acting Manager, Engine & Propeller Directorate, 

Aircraft Certification Service. 

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