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Federal Register / Vol. 86, No. 102 / Friday, May 28, 2021 / Proposed Rules of cracks in the intermediate-pressure compressor IPC rotor 1 R1 blades installed on certain Trent XWB model turbofan engines. This proposed AD
would require initial and repetitive borescope inspections BSIs of the affected IPC R1 blades and, depending on the results of the inspections, replacement of all 34 IPC R1 blades. The FAA is proposing this AD to address the unsafe condition on these products.
DATES: The FAA must receive comments on this proposed AD by July 12, 2021.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to https www.regulations.gov. Follow the instructions for submitting comments.
Fax: 202 4932251.
Mail: U.S. Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12 140, 1200 New Jersey Avenue SE, Washington, DC 20590.
Hand Delivery: Deliver to Mail address above between 9 a.m. and 5
p.m., Monday through Friday, except Federal holidays.
For service information identified in this NPRM, contact Rolls-Royce plc, Corporate Communications, P.O. Box 31, Derby, DE24 8BJ, United Kingdom;
phone: +44 01332 242424; fax: +44
01332 249936; email: https
www.rolls-royce.com/contact-us/civilaerospace.aspx; website: https
www.rolls-royce.com/contact-us.aspx.
You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 1200 District Avenue, Burlington, MA
01803. For information on the availability of this material at the FAA, call 781 2387759.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210381; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this NPRM, the mandatory continuing airworthiness information MCAI, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Kevin Clark, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone:
781 2387088; fax: 781 2387199;
email: kevin.m.clark@faa.gov.
SUPPLEMENTARY INFORMATION:

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Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under the ADDRESSES section. Include Docket No. FAA20210381; Project Identifier MCAI202001656E at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, explain the reason for any recommended change, and include supporting data. The FAA
will consider all comments received by the closing date and may amend this NPRM because of those comments.
Except for Confidential Business Information CBI as described in the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to https
www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this NPRM.
Confidential Business Information CBI is commercial or financial information that is both customarily and actually treated as private by its owner.
Under the Freedom of Information Act FOIA 5 U.S.C. 552, CBI is exempt from public disclosure. If your comments responsive to this NPRM
contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this NPRM, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI
as PROPIN. The FAA will treat such marked submissions as confidential under the FOIA, and they will not be placed in the public docket of this NPRM. Submissions containing CBI
should be sent to Kevin Clark, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA
01803. Any commentary that the FAA
receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.
Background The European Union Aviation Safety Agency EASA, which is the Technical Agent for the Member States of the European Community, has issued EASA
AD 20200277, dated December 11, 2020 referred to after this as the MCAI, to address the unsafe condition on these products. The MCAI states:
Occurrences have been reported of finding cracked IPC R1 blades on certain Trent XWB

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engines that were close to their first planned refurbishment shop visit.
This condition, if not corrected, could lead to blade failure and consequent engine inflight shut-down IFSD, possibly resulting in reduced control of the aeroplane.
To address this potential unsafe condition and avoid dual engine IFSD, Rolls-Royce issued the inspection NMSB to provide inspection instructions and the NMSB to provide information on threshold and intervals.
For the reasons described above, this EASA AD requires repetitive inspections of the affected parts and, depending on findings, accomplishment of applicable corrective actions.

You may obtain further information by examining the MCAI in the AD
docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210381.
FAAs Determination This product has been approved by EASA and is approved for operation in the United States. Pursuant to the FAAs bilateral agreement with the European Community, EASA has notified the FAA
of the unsafe condition described in the MCAI and service information. The FAA is issuing this NPRM because the agency evaluated all the relevant information provided by EASA and determined the unsafe condition described previously is likely to exist or develop in other products of the same type design.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Rolls-Royce NonModification Service Bulletin NMSB
Trent XWB 72K633, Initial Issue, dated August 7, 2020. This service information specifies procedures for performing initial and repetitive BSIs of the Trent XWB75, XWB79, XWB
79B, and XWB84 IPC R1 blades. This service information is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in ADDRESSES.
Other Related Service Information The FAA reviewed Rolls-Royce Alert NMSB Trent XWB 72AK612, Initial Issue, dated July 9, 2020; Rolls-Royce Alert NMSB Trent XWB 72AK613, Initial Issue, dated July 17, 2020; and Rolls-Royce Alert NMSB Trent XWB
72AK632, Initial Issue, dated August 7, 2020.
Rolls-Royce Alert NMSB Trent XWB
72AK612 describes procedures for performing a BSI of the Trent XWB84
IPC R1 blades. Rolls-Royce Alert NMSB
Trent XWB 72AK613 describes procedures for performing a BSI of the
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