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Federal Register / Vol. 86, No. 153 / Thursday, August 12, 2021 / Proposed Rules Monday through Friday, except Federal holidays. The AD docket contains this NPRM, the EASA AD, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Kevin M. Clark, Aviation Safety Engineer, ECO Branch, FAA, 1200
District Avenue, Burlington, MA 01803;
phone: 781 2387088; fax: 781 238
7199; email: kevin.m.clark@faa.gov.
SUPPLEMENTARY INFORMATION:
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 ADDRESSES. Include Docket No.
FAA20210655; Project Identifier MCAI202001497E 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 proposal 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.

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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 M. Clark, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803. Any commentary that the FAA receives that is not specifically
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designated as CBI will be placed in the public docket for this rulemaking.
Background EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD 20200244, dated November 5, 2020 EASA AD
20200244, to correct an unsafe condition on RRD Trent 700072 and Trent 700072C model turbofan engines.
This proposed AD was prompted by the manufacturer revising the engine TLM life limits of certain critical rotating parts and updating certain maintenance tasks. The FAA is proposing this AD to prevent the failure of critical rotating parts.
Related Service Information Under 1
CFR Part 51
The FAA reviewed EASA AD 2020
0244. EASA AD 20200244 specifies revising the approved AMP by incorporating the limitations, tasks, and associated thresholds and intervals described in the TLM. This material 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 Chapter 0510 of Rolls-Royce RR Trent 7000 TLM T
T70001RR, dated July 10, 2020. RR
Trent 7000 TLM TT70001RR, Chapter 0510, identifies the reduced life limits of certain critical rotating parts.
The FAA also reviewed Chapter 05
20 of RR Trent 7000 TLM TT7000
1RR, dated July 10, 2020. RR Trent 7000
TLM TT70001RR, Chapter 0520, identifies the critical rotating part inspection thresholds and intervals.
FAAs Determination These engines have been approved by the aviation authority of another country and are approved for operation in the United States. Pursuant to the FAAs bilateral agreement with the State of Design Authority, the FAA has been notified about the unsafe condition described in the EASA AD referenced in this proposed AD. The FAA is issuing this NPRM after determining that the unsafe condition described previously is likely to exist or develop on other products of the same type design.
Proposed AD Requirements in This NPRM
This proposed AD would require accomplishing the actions specified in EASA AD 20200244, described previously, as incorporated by
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reference, except for any differences identified as exceptions in the regulatory text of this proposed AD and except as discussed under Differences Between this Proposed AD and the EASA AD.
Explanation of Required Compliance Information In the FAAs ongoing efforts to improve the efficiency of the AD
process, the FAA initially worked with Airbus and EASA to develop a process to use certain EASA ADs as the primary source of information for compliance with requirements for corresponding FAA ADs. The FAA has since coordinated with other manufacturers and civil aviation authorities CAAs to use this process. As a result, EASA AD
20200244 will be incorporated by reference in the FAA final rule. This proposed AD would require compliance with EASA AD 20200244 in its entirety, through that incorporation, except for any differences identified as exceptions in the regulatory text of this proposed AD. Using common terms that are the same as the heading of a particular section in EASA AD 2020
0244 does not mean that operators need comply only with that section. For example, where the AD requirement refers to all required actions and compliance times, compliance with this AD requirement is not limited to the section titled Required Actions and Compliance Times in EASA AD
20200244. Service information specified in EASA AD 20200244 that is required for compliance with it will be available at https www.regulations.gov by searching for and locating Docket No.
FAA20210655 after the FAA final rule is published.
Differences Between This Proposed AD
and the EASA AD
This AD does not mandate the Maintenance Tasks and Replacement of Critical Parts and Corrective Actions sections of EASA AD 2020
0244. Where EASA AD 20200244
requires compliance from its effective date, this AD requires using the effective date of this AD. Where EASA AD 2020
0244 requires revising the AMP within 12 months from its effective date, this AD requires revising the AMP within 90
days after the effective date of this AD.
This AD does not mandate compliance with the Remarks section of EASA
AD 20200244.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 10
engines installed on airplanes of U.S.
Registry.

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