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

[Docket No. FAA-2014-0462; Directorate Identifier 2014-NE-06; Amendment 39- 18075; AD 2015-02-08] RIN 2120-AA64 Airworthiness Directives; Rolls-Royce Corporation Turboprop and Turbofan Engines (Type Certificate previously held by Allison Engine Company) AGENCY: Federal Aviation Administration (FAA), DOT

. ACTION: Final rule. SUMMARY: We are adopting a new airworthiness directive (AD) for certain RollsRoyce Corporation (RRC) AE 2100 series turboprop engines and AE 3007A and 3007C series turbofan engines. This AD was prompted by reports ofpitting in the wheel bores and subsequent RRC analysis that concluded that lower lif e limits are needed for the affected turbine wheels. This AD requires a reduction for the approved life limits ofthe affected turbine wheels. This AD also requires an eddy current inspection (ECI) of certain RRC engines with affected turbine wheels. We are issuing this AD to prevent uncontained failure ofthe turbine wheels, damage to the engine, and damage to the airplane. DATES: This AD is effective [INSERT DATE 35 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. The Director ofthe Federal Register approved the incorporation by reference of certain publications listed in this AD as of [INSERT DATE 35 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. ADDRESSES: For service information identified in this AD, contact Rolls-Royce Corporation, 450 South Meridian Street, Mail Code NB-01-06, Indianapolis, IN 46225;phone: 317-230-1667; email: CMSEindyOSD@rolls-royce.com; Internet: www.rollsroyce.com. You may view this service information at the FAA, Engine & Propeller Directorate, 12 New England Executive Park, Burlington, MA. For information onthe 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 by searching for and locating DocketNo. FAA-2014-0462, or in person at the Docket Management Facility 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 address for the Docket Office (phone: 800-647-5527) is Document Management Facility, U.S. Department ofTransportation, Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE., Washington, DC 20590. FOR FURTHER INFORMATION CONTACT: Kyri Zaroyiannis, Aerospace Engineer, Chicago Aircraft Certification Office, Small Airplane Directorate, FAA, 2300 E. Devon Ave., Des Plaines, IL 60018; phone: 847-294-7836; fax: 847-294-7834; email: kyri.zaroyiannis@faa.gov. SUPPLEMENTARY INFORMATION: Discussion We issued a notice ofproposed rulemaking (NPRM) to amend 14 CPRpart 39 by adding an AD that would apply to certain RRC AE 2100 series turboprop engines and AE 3007A and 3007C series turbofan engines. The NPRM published in the Federal Register
on October 2, 2014 (79 FR 59461). The NPRM was prompted by reports ofpitting in the wheel bores and subsequent RRC analysis that concluded that lower life limits are needed for the affected turbine wheels

. The NPRM proposed to require reducing the approved life limits ofthe

.affected turbine wheels and performing an ECI ofcertain RRC engines
2with affected turbine wheels. We are issuing this AD to prevent uncontained failure of the turbine wheels, damage to the engine, and damage to the airplane. 

### Comments We gave the public the opportunity to participate in developing this AD. We have considered the comment received. An anonymous commenter supported the NPRM (79 FR 59461, October 2, 2014). 

### Conclusion We reviewed the relevant data, considered the comment received, and determined that air safety and the public interest require adopting this AD as proposed except for minor editorial changes, e.g., verb tense changes and word changes appropriate to a final rule. We have determined that these minor changes:

• Are consistent with the intentthat was proposed in the NPRM (79 FR 59461, October 2, 2014) for correcting the unsafe condition; and

• Do not add any additional burden upon the public than was already proposed in the NPRM (79 FR 59461 , October 2, 2014). 

### Related Service Information We reviewed:

• Rolls-Royce (RR) Alert Service Bulletin (ASB) No. AE 21 OOD2-A-72-085, dated July 25,2013.
• RRASB No. AE 2100D3-A-72-277, dated July 25,2013.
• RR ASB No. AE 2100P-A-72-019, dated July 25,2013

. • RR ASB No. AE 3007A-A-72-407, Revision 1, dated August 29, 2014.
• RR ASB No. AE 3007A-A-72-408, Revision 1, dated August 29, 2014.
• RR ASB No. AE 3007C-A-72-316, dated December 6, 2013. These service bulletins describe procedures for inspecting high-pressure turbine (HPT) stage 2 wheels and identifies lif e-limit reduction for all affected HPT wheels

. You can 3find this information at http:/ /www.regulations.gov by searching for and locating Docket No. FAA-2014-0462. Costs ofCompliance We estimate that this AD will affect 664 engines installed on airplanes ofU.S. registry. We also estimate that it will take about 1hour to perform an ECI in the bore of the turbine wheel for affected engines. The average labor rate is $85 per hour. We estimate the pro-rated replacement cost would be $30,688 for a 1st stage gas generator turbine wheel; $63,693 for a HPT stage 1wheel; $13,941 for an HPT stage 2 wheel; and $13,186 for a 4th stage turbine wheel. We also estimate that these parts would be replaced during an engine shop visit at no additional labor cost. Based on these figures, we estimate the total cost ofthis AD on U.S. operators to be $11,317,969. 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 conditionthat is likely to exist or develop on products identified in this rulemaking action. Regulatory Findings 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 4national government and the States, or on the distribution ofpower and responsibilities among the various levels ofgovernment. For the reasons discussed above, I certify that this AD: (1) Is not a "significant regulatory action" under Executive Order 12866, (2) Is not a "significant rule" under 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 ofsmall entities under the criteria ofthe Regulatory Flexibility Act. 

### List ofSubjects in 14 CFR Part 39 Airtransportation, Aircraft, Aviation safety, Incorporation by reference, Safety

. 

### Adoption ofthe 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. 106(g), 40113,44701. 

### §39.13 [Amended] 2. The FAA amends § 39

.13 by adding the following new airworthiness directive (AD): 

### 2015-02-08 Roll-Royce Corporation (Type Certificate previously held by Allison Engine Company): Amendment 39-18075; DocketNo
.

**FAA-2014-046~**

**;** Directorate Identifier 2014-NE-06-AD

.



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### (a) Effective Date This AD is effective [INSERT DATE 35 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. (b) Affected ADs None. (c) 

### Applicability This AD applies to all Rolls-Royce Corporation (RRC) AE 2100D2, 2100D2A, 2100D3, and 2100P turboprop engines and AE 3007Al, Al/1 , Al/3, AlE, AlP, A2, A3, C, C1, and C2 turbofan engines: (1) 

### With an installed 1s tstage gas generator turbine wheel, part number (PIN) 23079946, 23088906, or 23089692, all serial numbers (SINs) listed in Table 2 and Table 3 ofRRC Alert Service Bulletin (ASB) No. AE 2100D2-A-72-085, dated July 25, 2013; and in Table 2 and Table 3 ofRRC ASB No. AE 2100D3-A-72-277, dated July 25,2013. (2) With an installed high-pressure turbine (HPT) stage 1or HPT stage 2 wheel, 

### PIN 23079946, 23088906, 23088784, 23084520, 23084781 , 23088817, or 23088818, all SINs listed in Table 1through Table 7 ofRRC ASB No. AE 3007A-A-72-407, Revision 1, dated August 29,2014, except those SINs excluded by Table 1, Table 2, Table 4, and Table 5 ofRRC ASB No. AE 3007A-A-72-407, Revision 1, dated August 29, 2014. (3) With an installed HPT stage 2 wheel, 

### PIN 23084520 or 23088818, all SINs listed in Table 1 and Table 2 ofRRC ASB No. AE 3007C-A-72-316, dated December 6, 2013, except those SINs excluded by Table 1ofRRC ASB No. AE 3007C-A-72-316, dated December 6, 2013. (4) With an installed 41 h 

### stage turbine wheel, 

### PIN 23083536, all SINs listed in Table 2 ofRRC ASB No. AE 2100P-A-72-019, dated July 25, 2013.

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### (d) Unsafe Condition This AD was prompted by reports ofpitting in the wheel bores and subsequent RRC analysis that concluded that lower life limits are needed for the affected turbine wheels. We are issuing this AD to prevent uncontained failure ofthe turbine wheels, damage to the engine, and damage to the airplane. (e) 

### Compliance Comply with this AD within the compliance times specified, unless already done. (1) For all RRC AE 3007Al, Al/1, Al/3, AlE, AlP, and A3 series engines with
an HPT stage 2 wheel 

### PIN and SIN identified in RRC ASB No. AE 3007A-A-72-408, Revision 1, dated August 29,2014, at each shop visit after the effective date ofthis AD, eddy current inspectthe bore ofthe affected HPT stage 2 wheels. Use RRC ASB No. AE 3007A-A-72-408, Revision 1, August 29,2014, to do the inspection. Do not return to service any wheel that fails the inspection required by this AD. (2) Thirty days after the effective date ofthis AD, do not return to service any engine that has a turbine wheel with a 

### PIN and an SIN listed in any ofthe following RRC ASBs whose wheel life exceeds the new life limits identified in the RRC ASBs: RRC ASB No. AE 2100D2-A-72-085, dated July 25, 2013 ; RRC ASB No. AE 2100D3-A-72-277, dated July 25, 2013; RRC ASB No. AE 2100P-A-72-019, dated July 25, 2013 ; I RRC ASB No. AE 3007A-A-72-407, Revision 1, dated August 29, 2014; or RRC ASB No. AE 3007C-A-72-316, dated December 6, 2013. (f) 

### Installation Prohibition Thirty days after the effective date ofthis AD, do not install an affected wheel, as identified in paragraph (c) ofthis AD, into any RRC AE 3007C2 engine.

7(g) 

### Definition For the purpose ofthis AD, an "engine shop visit" is the induction ofan engine into the shop for maintenance involving the separation ofpairs ofmajor mating engine flanges, exceptthat the separation ofengine flanges solely for the purposes of transportation without subsequent engine maintenance is not an engine shop visit. 

### (h) Alternative Methods ofCompliance (AMOCs) The Manager, Chicago Aircraft Certification Office, FAA, may approve AMOCs for this AD. Use the procedures found in 14 CFR 39.19 to make yourrequest. 

### (i) Related Information For more information about this AD, contact Kyri Zaroyiannis, Aerospace Engineer, Chicago Aircraft Certification Office, Small Airplane Directorate, FAA, 2300 E. Devon Ave., Des Plaines, IL 60018; phone: 847-294-7836; fax: 847-294-7834; email: kyri.zaroyiannis@faa.gov. U) 

### Material Incorporated 

### by Reference (1) The Director ofthe Federal Register approved the incorporation by reference (IBR) ofthe service information listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.(2) You must use this service information as applicable to do the actions required by this AD, unless the AD specifies otherwise. (i) Rolls-Royce Alert Service Bulletin (ASB) No. AE 21OOD2-A-72-085, dated July 25,2013.

2014. (ii) Rolls-Royce ASB No. AE 2100D3-A-72-277, dated July 25, 2013. (iii) Rolls-Royce ASB No
. AE 2100P-A-72-019, dated July 25, 2013. (iv) Rolls-Royce ASB No. AE 3007A-A-72-407, Revision 1, dated August 29,

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### (v) Rolls-Royce ASB No. AE 3007A-A-72-408, Revision 1, dated August 29, 2014. (vi) Rolls-Royce ASB No. AE 3007C-A-72-316, dated December 6, 2013

. (3) For RRC service information identified in this AD, contact Rolls-Royce Corporation, 450 South Meridian Street, Mail Code NB-01-06, Indianapolis, IN 46225; phone: 317-230-1667; email: CMSEindyOSD@rolls-royce

.com; Internet: www.rollsroyce.com. (4) 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. (5) You may view this service information at the National Archives and Records Administration (NARA)

. For information on the availability ofthis material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfrlibrlocations.html.

Issued in Burlington, Massachusetts, on January 13, 2015.

# ~~**ud re** **u, -----**  Acting Directorate Manager, Engine & 

### Propeller Directorate, Aircraft Certification Service

.

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