[Docket No. FAA-2012-1331; Directorate Identifier 2012-NE-44-AD] 

RIN 2120-AA64 

Airworthiness Directives; Rolls-Royce pic Turbojet Engines AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed ru1emaking (NPRM). 

SUMMARY: We propose to supersede airworthiness directive (AD) 2013-11-13 that 

applies to all Rolls-Royce pic (RR) Viper Mk. 601-22 turbojet engines. Since we issued 

AD 2013-11-13, RR determined that additional parts for the RR Viper Mk. 601-22 as 

well as additional engine models are affected. This proposed AD would add two new 

engine models and additional engine parts to the applicability. We are proposing this AD 

to prevent failure of life-limited parts, which could lead to an uncontained part release, 

damage to the engine, 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 follild in 14 CFR 11.43 

and 11.45, by any of the following methods: 

• Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: 202-493-2251. 

• Mail: U.S. Department of Transportation, Docket Operations, M-30, West 

Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE., Washington, DC 

20590. 
Bristol BS34 7QE, United Kingdom; phone: +44 (0) 117 97 90700; fax: +44 (0) 117 97 

95498; email: defence-operations-room@rolls-royce.com. 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, call 781-238-7125. It is also available on the internet at http://www.regnlations.gov 

by searching for and locating Docket No. F AA-2012-1331. 

Examining the AD Docket 

You may examine the AD docket on the Internet at http://www.regulations.gov by 

searching for and locating Docket No. FAA-2012-1331; 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 proposed AD, the mandatory continuing 

airworthiness information, regulatory evaluation, any comments received, and other 

information. The address for the Docket Office (phone: 800-647-5527) is in the 

ADDRESSES section. Comments will be available in the AD docket shortly after receipt .. 

FOR FURTHER INFORMATION CONTACT: Philip Haberl en, Aerospace Engineer, 

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

Executive Park, Burlington, MA 01803; phone: 781-238-7770; fax: 781-238-7199; email: 

philip.haberlen@faa.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. 

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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 we receive about this 

NPRM. 

Discussion 

On May 28, 2013, we issued AD 2013-11-13, Amendment 39-17473 (78 FR 

34550, June 10, 2013) ("AD 2013-11-13"), for all RR Viper Mk. 601-22 turbojet engines. 

AD 2013-11-13 requires reducing the life of certain critical parts. AD 2013-11-13 

resulted from a review by RR of the lives of these parts. We issued AD 2013-11-13 to 

prevent failure oflife-limited parts, which could lead to an uncontained part release, 

damage to the engine, and damage to the airplane. 

Actions Since AD 2013-11-13 Was Issued 

Since we issued AD 2013-11-13, RR determined that additional parts on the 

Viper Jvfk. 601-22 engine model and the Viper Mk. 521 and Mk. 522 engine models 

experienced the same unsafe condition. Also since we issued AD 2013-11-13, the 

European Aviation Safety Agency has issued AD 2015-0127Rl, dated August 14, 2015, 

which requires reducing the cyclic life limits of the affected parts. 

Related Service Information under 1 CFR Part 51 

We reviewed RR Alert Service Bulletin (ASB) Mk. 521 Number 72-A408, 

Circulation A, dated January 2015; ASB Mk. 521 Number 72-A408, Circulation B, dated 

January 2015; ASB Mk. 522 Number 72-A413, Circulation A, dated January 2015; ASB 

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through their normal course of business or by the means identified in the ADDRESSES 

section of this NPRM. 

FAA's Determination 

We are proposing this AD because we evaluated all the relevant information and 

determined the llllsafe condition described previously is likely to exist or develop in other 

products of the same type design. 

Proposed AD Requirements 

This NPRM would require accomplishing the actions specified in the service 

information described previously. This NPRM would add two engine models and 

additional affected parts to the applicability of AD 2013-11-13. 

Costs of Compliance 

We estimate that this proposed AD will affect about 46 engines installed on 

airplanes ofU.S. registry. We also estimate a prorated parts cost of $66,000 per engine. 

We also estimate that it would take about 4 hours per engine to comply with this 

proposed AD. The average labor rate is $85 per hour. Based on these figures, we estimate 

the cost of this proposed AD on U.S. operators to be $3,051,640. 

Authority for this Rulemaking 

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

aviation safety. Subtitle I, Section 106, describes the authority of the FAA Administrator. 

Subtitle VII, Aviation Programs, describes in more detail the scope of the Agency's 

authority. 

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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 have determined that this proposed AD would not have federalism 

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

substantial direct effect on the States, on the relationship between the national 

Govenunent and the States, or on the distribution of power and responsibilities among the 

various levels of government. 

For the reasons discussed above, I certify that the 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), 

(3) Will not affect intrastate aviation in Alaska to the extent that it justifies 

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 of the Regulatory Flexibility Act. 

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: 

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2. The FAA amends§ 39.13 by removing airworthiness directive (AD) 2013-11-

13, Amendment 39-17473 (78 FR 34550, June 10, 2013) ("AD 2013-11-13"), and adding 

the following new AD: 

Rolls-Royce plc (Type Certificate previously held by Rolls-Royce (1971) Limited, 

Bristol Engine Division): Docket No. F AA-2012-1331; Directorate Identifier 2012-NE44-AD. 

(a) Comments Due Date 

We must receive comments by [INSERT DATE 60 DAYS AFTER DATE OF 

PUBLICATION IN THE FEDERAL REGISTER]. 

(b) Affected ADs 

This AD supersedes AD 2013-11-13. 

(c) Applicability 

This AD applies to all Rolls-Royce plc (RR) Viper Mk. 521, Viper Mk. 522, and 

Viper Mk. 601-22 turbojet engines. 

(d) Unsafe Condition 

This AD was prompted by a review by RR of the lives of certain critical parts. We 

are issuing this AD to prevent failure of life-limited parts, which could lead to an 

uncontained part release, damage to the engine, and damage to the airplane. 

(e) Compliance 

Comply with this AD within the compliance times specified, unless already done. 

(1) Within 30 days after the effective date of this AD, or before any affected part 

exceeds its new revised life limit, whichever occurs later, remove any engine from 

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Number 72-A207, dated January 2015, to determine the new life limits. 

(2) For the RR Viper lvfk. 601-22 turbojet engine, remove compressor shaft, part 

number V900766, before the compressor shaft accumulates 20,720 flight cycles since 

new. 

(f) Installation Prohibition 

After the effective date of this AD, do not install any affected part identified in 

paragraph (e) of this AD into any engine, nor return any engine to service with any 

affected part identified in paragraph (e) of this AD installed, if any affected part exceeds 

the life limit specified in the appropriate ASB identified in paragraph (e )(1) and/or the 

life limit identified in paragraph (e)(2) of this AD. 

(g) Alternative Methods of Compliance (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. You may email your request 

to: ANE-AD-AMOC@faa.gov. 

(h) Related Information 

(1) For more information about this AD, contact Philip Haberl en, Aerospace 

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

England Executive Park, Burlington, MA 01803; phone: 781-238-7770; fax: 781-238-

7199; email: philip.haberlen@faa.gov. 

(2) Refer to MCAI European Aviation Safety Agency AD 2015-0127R1, dated 

August 14,2015, for more information. You may examine the MCAI in the AD docket 

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72-A413, Circulation A, dated January 2015; ASB Mk. 522 Number 72-A412, 

Circulation B, dated January 2015; and ASB Mk. 601-22 Nmnber 72-A207, dated 

January 2015, can be obtained from RR, using the contact information in paragraph 

(h)(4) of this proposed AD. 

( 4) For service information identified in this AD, contact DA Services Operations 

Room at Rolls-Royce plc, Defense Sector Bristol, WH-70, P .0. Box 3, Filton, Bristol 

BS34 7QE, United Kingdom; phone: +44 (0) 117 97 90700; fax: +44 (0) 117 97 95498; 

email: defence-operations-room@rolls-royce.com. 

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

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

availability of this material at the FAA, call 781-238-7125. 

Issued in Burlington, Massachusetts, on October 2, 2015. 

Colleen M. D' Alessandro, 

Directorate Manager, Engine & Propeller Directorate, 

Aircraft Certification Service. 

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