[4910-13-P] DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA-2012-1031; Directorate Identifier 2012-NE-31-AD; Amendment 39-17391; AD 2013-05-19] RIN 2120-AA64 Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Turbofan Engines AGENCY: Federal Aviation Administration (FAA) , DOT. ACTION: Final rule. SUMMARY: We are adopting a new airworthiness directive (AD) for certain RollsRoyce Deutschland Ltd & Co KG (RRD) Tay 611-8 turbofan engines. This AD requires inspection and replacement, ifnecessary, ofaffected bolts. This AD was prompted by a quality review determination that bolts with reduced material properties may have been installed in some engines
. We are issuing this AD to prevent uncontained turbine disc fracture and damage to the airplane. DATES: This AD becomes effective [Insert date 35 days after date ofpublication in the FEDERAL REGISTER]. ADDRESSES: The Docket Operations office is located at Docket Management Facility, U.S. Department ofTransportation, 1200 New Jersey Avenue SE. , West Building Ground Floor, Room Wl2-140 , Washington, DC 20590-0001.FOR FURTHER INFORMATION CONTACT: Frederick Zink, Aerospace Engineer, Engine Certification Office, FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803 ; email : frederick
.zink@ faa.gov; telephone: 781- 238-7779 ; fax: 781-238-7199
. SUPPLEMENTARY INFORMATION: Discussion We issued a notice ofproposed rulemaking (NPRM) to amend 14 CFR part 39 to include an AD that would apply to the specified products. That NPRM was published in the Fed eral Register on November 13 , 2012 (77 FR 67582)
. That NPRM proposed to correct an unsafe condition for the specified products. The Mandatory Continuing Airworthiness Information states:

Comments The results ofa recent quality review oflow pressure turbine (LPT) stage 1 static air seal and high pressure turbine (HPT) stage 1 air seal support bolts identified that, before installation, those bolts may have not been inspected. As a consequence, bolts with reduced material properties may have been installed in some engmes. This condition, ifnot detected and corrected, could lead to failure ofa bolt, potentially causing turbine disc fracture and release of high-energy debris , possibly resulting in damage to the aeroplane and/or injury to the occupants.

We gave the public the opportunity to participate in developing this AD
. We received no comments on the NPRM (77 FR 67582 , November 13 , 2012). However, we changed paragraph (e) ofthis AD by removing the reporting requirement because that requirement is not necessary to correct the unsafe condition
.

2Conclusion We reviewed the available data and determined that air safety and the public interest require adopting the AD as proposed (77 FR 67582, November 13 , 2012). 

### Costs of Compliance Based on the service information, we estimate that this AD affects about 20 engines ofU
.S. registry. We also estimate that it will take about 4 hours per product to comply with this AD. The average labor rate is $85 per hour. Required parts will cost about $1 ,848 per engine. Based on these figures , we estimate the cost ofthe AD on U.S. operators to be $43 ,760. 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 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 ofthat authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action
.

3Regulatory 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) ; 3. Will not affect intrastate aviation in Alaska to the extent that itjustifies making
a regulatory distinction, and 4
. Will not have a significant economic impact, positive or negative, on a substantial number of small 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. 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 provided in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt.

4List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: PART 39 - AIRWORTHINESS DIRECTIVES 1. The authority citation for part 39 continues to read as follows: Authority : 49 U.S.C. 1 06(g), 40113 , 44701. 

### § 39.13 [Amended] 2
. The FAA amends§ 39.13 by adding the following new AD: 2013-05-19 Rolls-Royce Deutschland Ltd & Co KG: Amendment 39-17391; Docket No. FAA-2012-1 031; Directorate Identifier 2012-NE-31-AD. (a) Effective Date This airworthiness directive (AD) becomes effective [Insert date 35 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 611-8 turbofan engines, serial numbers 16245 , 16256, 16417, 16418, 16584, 16585, 16639, 16640, 16701 , 16702, 16813 , 16814, 16853 , 16854, 16879, 16880, 16898 , 16905, 16906, 16911 , 16923 , 16935 , and 16936, with a date ofthe last shop visit before December 8, 2006. 

### 5(d) Reason This AD was prompted by a recent quality review determination that bolts with reduced material properties may have been installed in some engines. We are issuing this AD to prevent uncontained turbine disc fracture and damage to the airplane. (e) Actions and Compliance Unless already done, for engines with a date ofthe last shop visit before December 8, 2006, do the following actions: (1) Ifengine cycles accumulated since the last engine shop visit is 5,400 cycles or
more on the effective date ofthis AD , inspect the bolts installed in the low-pressure turbine (LPT) stage I static seal and high-pressure turbine (HPT) stage 1 air seal support within 100 engine cycles-in-service after the effective date ofthis AD. (2) Ifengine cycles accumulated since the last engine shop visit is fewer than 5,400 cycles on the effective date ofthis AD, inspect the bolts installed in the LPT stage 1 static seal and HPT stage 1 air seal support before accumulating 5,500 engine cycles since the last engine shop visit. (3) Ifyou find any broken bolt, brown bolt, or bolt with a rough oxidized surface, then replace all bolts ofthe inspected engine flange with new bolts before further flight. (f) Installation Prohibition After the effective date ofthis AD, do not install any HPT module and/or LPT module into any engine, or any engine onto an airplane, unless the bolts have been inspected and replaced ifnecessary, as specified in paragraph (e) ofthis AD.

6(g) Alternative Methods of Compliance (AMOCs) The Manager, Engine Certification Office, FAA, may approve AMOCs to this AD. Use the procedures found in 14 CFR 39.19 to make your request. (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; email: frederick.zink @ faa.gov. (2) Refer to European Aviation Safety Agency AD 2012-0163 , dated August 28 , 2012, and RRD Alert Service Bulletin T AY-72-A 1696, Revision 1, dated June 11, 2012, for related information. (3) For service information identified in this AD, contact Rolls-Royce Deutschland Ltd & Co KG, Eschenweg 11 , Dahlewitz, 15827 Blankenfelde-Mahlow, Germany; phone: 49 0 33-7086-1200 (direct 1016) ; fax: 49 0 33-7086-1212. You may view this service information at the 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
.

7Issued in Burlington, Massachusetts, on March 7, 2013
.

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

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