[4910-13-P] DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA-2012-1350; Directorate Identifier 2012-NE-40-AD; Amendment 39-17313; AD 2012-27-01] RIN 2120-AA64 Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Turbofan Engines AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final rule; request for comments. SUMMARY: We are adopting a new airworthiness directive (AD) for certain RollsRoyce Deutschland Ltd & Co KG (RRD) Model Tay 620-15 turbofan engines

. This AD requires a one-time inspection ofthe low-pressure compressor (LPC) fan blades and if erosion is found their replacement before further flight. This AD was prompted by evidence ofexcessive leading edge erosion ofthe LPC fan blades on certain Tay 620-15 engines. We are issuing this AD to prevent failure ofthe LPC fan blade, which could result in uncontained engine failure and damage to the airplane. DATES: This AD becomes effective [Insert date 15 days after date ofpublication in the FEDERAL REGISTER]. We must receive comments on this AD by [Insert date 45 days after date of publication in the FEDERAL REGISTER]. ADDRESSES: You may send comments by any ofthe following methods :• Federal eRulemaking Portal: Go to http://www.regulations

.gov and follow the instructions for sending your comments electronically.

• Mail: U.S. Department ofTransportation, 1200 New Jersey Avenue SE., West Building Ground Floor, Room Wl2-140, Washington, DC 20590-0001

.

• 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 AD, contact Rolls-Royce Deutschland Ltd & Co KG, Eschenweg 11 , Dahlewitz, 15827 Blankenfelde-Mahlow, Germany; phone: 49 0 33-7086-1883; 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 ofthis material at the FAA, call 781-238-7125

. Examining the AD Docket You may examine the AD docket on the Internet at http://www.regulations.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 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.

2FOR FURTHER INFORMATION CONTACT: Frederick Zink, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; phone: 781-238-7779; fax: 781-238-7199; email: frederick.zink@faa.gov. SUPPLEMENTARY INFORMATION: Discussion The European Aviation Safety Agency (EASA), which is the Technical Agent for the Member States ofthe European Community, has issued EASA Emergency Airworthiness Directive 2012-0234, dated November 6, 2012 (referred to after this as

"the MCAI"), to correct an unsafe condition for the specified products. The MCAI states: The Low Pressure Compressor (LPC) (fan) blades ofcertain Tay 620115/20 and Tay 620-15 engines show evidence ofexcessive leading edge erosion

. Excessive material removal during the maintenance reduces the LPC (fan) blade chordal width and potentially changes the balance ofthe fan blade. Reduced chordal width can affect LPC (fan) blade performance and in combination with other circumstances could lead to a fan blade root failure and fan blade separation. This condition, ifnot detected and corrected, could lead to the LPC (fan) blade failure, potentially causing release ofhigh-energy debris, possibly resulting in damage to the aeroplane and/or injury to the occupants. We are issuing this AD to prevent failure ofthe LPC fan blade, which could result in uncontained engine failure and damage to the airplane. You may obtain further information by examining the MCAI in the AD docket.

3Relevant Service Information RRD has issued Alert Non-Modification Service Bulletin TAY-72-A1777, dated October 26, 2012. The actions described in this service information are intended to correct the unsafe condition identified in the MCAI. 

### FAA's Determination and Requirements ofthis AD This product has been approved by Germany and is approved for operation in the United States. Pursuant to our bilateral agreement with the European Community, EASA has notified us ofthe unsafe condition described in the MCAI and service information referenced above

. We are issuing 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 ofthe same type design. This AD requires a one-time inspection ofthe LPC fan blades and iferosion is found their replacement before further flight. 

### FAA's Determination ofthe Effective Date No domestic operators use this product. Therefore, we find that notice and opportunity for prior public comment are unnecessary and that good cause exists for making this amendment effective in less than 30 days. Comments Invited This AD is a final rule that involves requirements affecting flight safety, and we did not precede it by notice and opportunity for public comment. We invite you to send any written relevant data, views, or arguments about this AD

. Send your comments to an address listed under the ADDRESSES section. Include "DocketNo. FAA-2012-1350; Directorate Identifier 2012-NE-40-AD" at the beginning ofyour comments. We specifically invite comments on the overall regulatory, economic, environmental, and 4energy aspects ofthis AD. We will consider all comments received by the closing date and may amend this AD because ofthose comments. We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact with FAA personnel concerning this AD. Using the search function ofthe Web site, anyone can find and read the comments in any ofour dockets, including, ifprovided, the name ofthe individual who sent the comment (or signed the comment on behalfofan association, business, labor union, etc.). You may review the DOT's complete Privacy Act Statement in the Federal Register published on April 11, 2000 (65 FR 19477-78). Authority for This Rulemaking Title 49 ofthe United States Code specifies the FAA' s authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority ofthe FAA Administrator. "Subtitle VII: Aviation Programs," describes in more detail the scope ofthe Agency's authority. We are issuing this rulemaking under the authority described in "Subtitle VII, Part A, Subpart III, Section 44701: General requirements." Under that section, Congress charges the FAA with promoting safe flight ofcivil 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 ofthat authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.



### 5Regulatory Findings We determined that this AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct 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 ofgovernment. For the reasons discussed above, I certify this AD: 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 ofsmall entities under the criteria ofthe Regulatory Flexibility Act. We prepared a regulatory evaluation ofthe estimated costs to comply with this AD and placed it in the AD docket. List ofSubjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. Adoption ofthe Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFRpart 39 as follows: PART 39 -AIRWORTHINESS DIRECTIVES 1. 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: 62012-27-01 Rolls-Royce Deutschland Ltd & Co KG (Formerly Rolls-Royce pic, Derby, England): Amendment 39-17313; Docket No. FAA-2012-1350; Directorate Identifier 2012-NE-40-AD. (a) Effective Date This airworthiness directive (AD) becomes effective [Insert date 15 days after date ofpublication in the FEDERAL REGISTER]. (b) Affected ADs None. (c) Applicability This AD applies to Rolls-Royce Deutschland Ltd & Co KG (RRD) Tay 620-15 turbofan engines, serial numbers 17085, 17088, 17166, 17072, 17073 , 17078, and 17079. (d) Reason This AD was prompted by evidence ofexcessive leading edge erosion ofthe lowpressure compressor (LPC) fan blades on certain Tay 620-15 engines. We are issuing this AD to prevent failure ofthe LPC fan blade, which could result in uncontained engine failure and damage to the airplane. (e) Actions and Compliance Unless already done, do the following. (1) Before the next flight after the effective date ofthe AD, inspect the leading edge ofthe LPC fan blades and determine ifexcessive erosion is evident. Guidance on conducting the inspection can be found in RRD Alert Non-Modification Service Bulletin (NMSB) TAY-72-A1777, dated October 26, 2012.

7(2) Ifthe measured blade chordal width is outside the requirements, before the next flight, replace the complete set ofLPC fan blades with a set ofLPC fan blades eligible for installation. (3) Within 30 days after performing the inspection required by paragraph (e)(1) of this AD, provide, for all repaired blades, the actual chordal width measurement to RRD, Service Engineering. (t) Paperwork Reduction Act Burden Statement For any reporting requirement in this AD, a federal agency may not conduct or sponsor, and a person is not required to respond to, nor shall a person be subject to a penalty for failure to comply with a collection ofinformation subject to the requirements ofthe Paperwork Reduction Act unless that collection ofinformation displays a current valid OMB Control Number. The OMB Control Number for this information collection is 2120-0056. Public reporting for this collection ofinformation is estimated to be approximately 5 minutes per response, including the time for reviewing instructions, completing and reviewing the collection ofinformation. All responses to this collection ofinformation are mandatory. Comments concerning the accuracy ofthis burden and suggestions for reducing the burden should be directed to the FAA at: 800 Independence Ave. SW, Washington, DC 20591 , Attn: Information Collection Clearance Officer, AES200. (g) Alternative Methods ofCompliance (AMOCs) The Manager, Engine Certification Office, may approve AMOCs for this AD. Use the procedures found in 14 CFR 39.19 to make your request.

8(h) 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 01803; phone: 781-238-7779; fax: 781-238- 7199; e-mail: frederick.zink@faa

.gov. (2) Refer to European Aviation Safety Agency Emergency AD 2012-0234, dated November 6, 2012 and RRD AlertNMSB TAY-72-A1777. (3) For service information identified in this AD, contact Rolls-Royce Deutschland Ltd & Co KG, Eschenweg 11, Dahlewitz, 15827 Blankenfelde-Mahlow, Germany; telephone: 49 0 33-7086-1883; fax: 49 0 33-7086-3276. You may view this service information at FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA. For information on the availability ofthis material at the FAA, call 781-238-7125. (i) Material Incorporated by Reference None. Issued in Burlington, Massachusetts, on December 27, 2012.

Colleen M. D'Alessandro, Assistant Manager, Engine & Propeller Directorate, Aircraft Certification Service.

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