DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA-2013-0397; Directorate Identifier 2013-NE-15-AD] 

RIN 2120-AA64 

[4910-13-P] 

Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Turbofan 

Engines 

AGENCY: Federal Aviation Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking (NPRM). 

SUMMARY: We propose to adopt a new airworthiness directive (AD) for all RollsRoyce Deutschland Ltd & Co KG (RRD) model Tay 650-15 turbofan engines. This 

proposed AD was pf;ompted by excessive deterioration of the high-pressure (HP) air 

bleed valve operating mechanism. This proposed AD would require a one-time inspection 

of the HP air bleed valve operating mechanism and, depending on findings, corrective 

action. We are proposing this AD to prevent multiple fan blade failure, which could result 

in 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 by any ofthe following methods: 

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

instructions for sending your comments electronically. 
• Mail: Docket Management Facility, U.S. Department of Transportation, 1200 

New Jersey Avenue SE., West Building Ground Floor, Room W12-140, 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 proposed AD, contact Rolls-Royce 

Deutschland Ltd & Co KG, Eschenweg 11 , Dahlewitz, 15827 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. For information on the availability of this material at 

the FAA, call 781-238-7125. 

Examining the AD Docket 

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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 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; email: 

frederick.zink@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. 

Include "Docket No. FAA-2013-0397; Directorate Identifier 2013-NE-15-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 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 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 April11 , 2000 (65 FR 19477-78). 

Discussion 

The European Aviation Safety Agency (EASA), which is the Technical Agent for 

the Member States of the European Community, has issued EASA Airworthiness 

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Directive 2013-0086, dated April9, 2013, to correct an unsafe condition for the specified 

products. That mandatory continuing airworthiness information (MCAI) states: 

A review of the service history ofTay engines discovered that the 

High Pressure (HP) air bleed valve operating mechanism could be 

a subject of excessive deterioration, influencing the aerodynamics 

and stability of the Low Pressure (LP) compressor (fan) rotor. 

This condition, if not corrected, could reduce fan flutter margin 

and, in some cases, could lead to multiple fan blade failures, 

possibly resulting in an uncontained release of high energy debris 

with consequent damage to, and/or reduced control of, the 

aeroplane. 

We are proposing this AD to prevent multiple fan blade failure, 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. 

Relevant Service Information 

RRD has issued Alert Non-Modification Service Bulletin (NMSB) No. TA Y -75-

A1784, dated February 14, 2013. The NMSB describes procedures for inspection of the 

HP air bleed valve operating mechanism and corrective action, if necessary. 

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 

AD would require a one-time inspection of the HP air bleed valve operating mechanism 

and, depending on findings, corrective action. 

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Costs of Compliance 

We estimate that this proposed AD affects 52 Tay turbofan engines installed on 

airplanes of U.S. registry. We also estimate that it would take about 10 hours per engine 

to comply with this proposed AD. The average labor rate is $85 per hour. Required parts 

cost about $153 per product. Based on these figures, we estimate the cost ofthe proposed 

AD on U.S. operators to be $52,156. 

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. 

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 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 

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

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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); 

(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. 

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 

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): 

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Rolls-Royce Deutschland Ltd & Co KG Turbofan Engines (formerly Rolls-Royce 

pic): Docket No. FAA-2013-0397; Directorate Identifier 2013-NE-15-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 

None. 

(c) Applicability 

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

650-15 turbofan engines. 

(d) Reason 

This AD was prompted by excessive deterioration of the high-pressure (HP) air 

bleed valve operating mechanism which affects the aerodynamic flutter margin, causing 

subsequent multiple fan blade failure. We are issuing this AD to prevent multiple fan 

blade failure, which dould result in uncontained engine failure and damage to the 

airplane. 

(e) Actions and Compliance 

Unless already done, do the following actions. 

( 1) Within 1,500 flight cycles after the effective date of this AD, perform a onetime inspection of the HP air bleed valve operating mechanism. Use paragraphs 3.D. and 

3.E. ofRRD Alert Non-Modification Service Bulletin (NMSB) No. TA Y-75-A1784, 

dated February 14, 2013, to do your inspection. 

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(2) If the measured torque necessary to open and close the HP air bleed valve is 

higher than the torque values referenced in paragraph 3.D.(l)(a) ofRRD Alert NMSB 

No. T A Y -75-A 1784, dated February 14, 2013, then before next flight, accomplish 

paragraph 3.E. ofRRD Alert NMSB No. TA Y-75-A1784, dated February 14, 2013 . 

(f) 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. 

(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 01803; phone: 781-238-7779; fax: 781-

238-7199; email: frederick.zink@faa.gov. 

(2) Refer to European Aviation Safety Agency Airworthiness Directive 2013-

0086, dated April 9, 2013, and RRD Alert NMSB No. TA Y-75-A1784, dated February 

14, 2013 , 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 33-7086-1944; 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. For information on the availability of this material at 

the FAA, call 781-23'8-7125. 

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.. 

Issued in Burlington, Massachusetts, on June 6, 2013. 

Colleen M. D' Alessandro, 

Assistant Manager, Engine & Propeller Directorate, 

Aircraft Certification Service. 

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