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Federal Register / Vol. 86, No. 179 / Monday, September 20, 2021 / Proposed Rules
Supplemental notice of proposed rulemaking SNPRM.

ACTION:

The FAA is revising a notice of proposed rulemaking NPRM that applied to all Rolls-Royce Deutschland Ltd & Co KG RRD Trent 1000A2, Trent 1000AE2, Trent 1000C2, Trent 1000CE2, Trent 1000D2, Trent 1000
E2, Trent 1000G2, Trent 1000H2, Trent 1000J2, Trent 1000K2, and Trent 1000L2 model turbofan engines.
This action revises the NPRM by requiring revision of the engine Time Limits Manual TLM life limits of certain critical rotating parts and direct accumulation counting DAC data files, as specified in a European Union Aviation Safety Agency EASA AD, which is proposed for incorporation by reference IBR. The FAA is proposing this AD to address the unsafe condition on these products. Since these actions would impose an additional burden over those in the NPRM, the agency is requesting comments on this SNPRM.
DATES: The FAA must receive comments on this SNPRM by November 4, 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 W12140, 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 material that is proposed for IBR
in this AD, contact EASA, KonradAdenauer-Ufer 3, 50668 Cologne, Germany; telephone: +49 221 8999 000;
email: ADs@easa.europa.eu. You may find this material on the EASA website at https ad.easa.europa.eu. For RRD
service information identified in this SNPRM, contact Rolls-Royce plc, Corporate Communications, P.O. Box 31, Derby, DE24 8BJ, United Kingdom;
phone: +44 01332 242424; fax: +44
01332 249936; website: https
www.rolls-royce.com/contact-us.aspx.
You may view this material 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 781 238
7759. The EASA material is also available at https www.regulations.gov by searching for and locating Docket No.
FAA20200364.
SUMMARY:

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Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20200364; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains the NPRM, this SNPRM, 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.
FAA20200364; Project Identifier MCAI201900119E 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 again revise 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 proposed AD.
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 SNPRM
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 SNPRM, 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
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will not be placed in the public docket of this SNPRM. 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 designated as CBI will be placed in the public docket for this rulemaking.
Background The FAA issued an NPRM to amend 14 CFR part 39 by adding an AD that would apply to all RRD Trent 1000A2, Trent 1000AE2, Trent 1000C2, Trent 1000CE2, Trent 1000D2, Trent 1000
E2, Trent 1000G2, Trent 1000H2, Trent 1000J2, Trent 1000K2, and Trent 1000L2 model turbofan engines.
The NPRM published in the Federal Register on April 10, 2020 85 FR
20216. The NPRM was prompted by the manufacturer revising the engine TLM
life limits of certain critical rotating parts and DAC data files. In the NPRM, the FAA proposed to require operators to revise the airworthiness limitation section ALS of their approved aircraft maintenance program AMP by incorporating the revised tasks of the applicable TLM for each affected model turbofan engine.
Actions Since the NPRM Was Issued Since the FAA issued the NPRM, RRD
has revised the tasks of the TLM for affected engines, updating the life limits of certain critical rotating parts and updating the DAC data files. RRD
published Rolls-Royce Trent 1000 TLM
T-Trent-10RRC, Chapters 0510 and 05
20, Revision 20, both dated August 1, 2020.
Additionally, since the FAA issued the NPRM, EASA, which is the Technical Agent for the Member States of the European Union, superseded AD
20190058R1, dated April 2, 2019, with AD 20200241, dated November 5, 2020
EASA AD 20200241, to require updates to the life limits and the DAC
data files for affected engines.
Comments The FAA received one comment on the NPRM from The Boeing Company Boeing. The agency considered the comment received. Boeing supported the NPRM without change.
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
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