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Federal Register / Vol. 86, No. 130 / Monday, July 12, 2021 / Rules and Regulations
manual TLM to incorporate repairs to the low-pressure compressor LPC
blades and introduce a new fan blade inspection. This AD requires revisions to the airworthiness limitations section ALS of the Rolls-Royce RR Trent XWB TLM and the operators existing approved aircraft maintenance program AMP. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective August 16, 2021.
ADDRESSES: For service information identified in this final rule, contact Rolls-Royce plc, Corporate Communications, P.O. Box 31, Derby, DE24 8BJ, United Kingdom; phone: +44
01332 242424; 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. It is also available at https www.regulations.gov by searching for and locating Docket No.
FAA20210022.

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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.
FAA20210022; 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 final rule, the mandatory continuing airworthiness information MCAI, any comments received, and other information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Scott Stevenson, Aviation Safety Engineer, ECO Branch, FAA, 1200
District Avenue, Burlington, MA 01803;
phone: 781 2387132; fax: 781 238
7199; email: Scott.M.Stevenson@faa.gov.
SUPPLEMENTARY INFORMATION:
Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to all RRD Trent XWB75, Trent XWB79, Trent XWB79B, Trent XWB
84, and Trent XWB97 model turbofan engines. The NPRM published in the Federal Register on February 23, 2021
86 FR 10878. The NPRM was prompted by the manufacturer revising the TLM to incorporate repairs to the
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Jkt 253001

LPC blades and introduce a new fan blade inspection. In the NPRM, the FAA
proposed to require revisions to the ALS
of the RR Trent XWB TLM, as applicable to each engine model, and to the operators existing approved AMP, to include new or more restrictive sections of the applicable RR Trent XWB TLM for each affected engine model. The FAA is issuing this AD to address the unsafe condition on these products.
The European Union Aviation Safety Agency EASA, which is the Technical Agent for the Member States of the European Community, has issued EASA
AD 20200066, dated March 23, 2020
referred to after this as the MCAI, to address the unsafe condition on these products. The MCAI states:
The Airworthiness Limitations Section instructions for Trent XWB engines, which are approved by EASA, are defined and published in TLM TRENTXWBK0680
TIME001. These instructions have been identified as mandatory for continued airworthiness. Failure to accomplish these instructions could result in an unsafe condition.
Rolls-Royce recently revised the TLM, introducing new and/or more restrictive instructions.
For the reason described above, this EASA AD requires accomplishment of the instructions specified in the TLM, as defined in this AD.

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.
FAA20210022.
Discussion of Final Airworthiness Directive Comments The FAA received comments from two commenters. The commenters were Air Line Pilots Association, International ALPA and Delta Air Lines, Inc. DAL. The following presents the comments received on the NPRM and the FAAs response to each comment.
Request To Revise Required Actions DAL commented that revising the AMP to include the specific requirements contained in Figure 1 to paragraph g1 or Figure 2 to paragraph g2 is difficult. DAL requested that the FAA revise paragraph g of this AD to allow incorporation of the specific language referenced in Figure 1 to paragraph g1 or Figure 2 to paragraph g2 into the AMP instead of only allowing incorporation of the figures into the AMP.
The FAA agrees and has revised Note 1 to paragraph g of this AD to clarify that operators may choose to incorporate the language referenced in
PO 00000

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Figure 1 to paragraph g1 or Figure 2
to paragraph g2 directly into their existing approved AMP instead of incorporating the respective figures into the existing approved AMP.
Request To Include Modification Specifications of the Ultra Long Range Operation DAL noted that paragraph g1 of the NPRM includes a proposed requirement that applies to Trent XWB84 Ultra Long Range ULR operation. However, the RR Trent XWB TLM does not define the specification of a ULR operation.
DAL commented that ULR operation requires modification to the airplane.
The Trent XWB84 can be installed on both A350900 standard or ULR
operations without any modification to the engine. DAL added that the airplane type certification data sheet does not specify the modification standards of a ULR operation. Since the TLM does not include any specifications of ULR
operation and the aircraft type certificate data sheet does not define this specific standard, DAL requested that the FAA include the modification specifications of the ULR operation in the final rule.
The FAA disagrees. Although the airplane requires modification for ULR
operation, the Trent XWB84 model turbofan engine does not require modification for ULR operation and can be installed on a standard airplane or a ULR airplane. The FAA did not change this AD.
Support for the AD
ALPA expressed support for the NPRM as written.
Conclusion The FAA reviewed the relevant data, considered any comments received, and determined that air safety requires adopting this AD as proposed.
Accordingly, the FAA is issuing this AD
to address the unsafe condition on these products. Except for minor editorial changes, and any other changes described previously, this AD is adopted as proposed in the NPRM.
None of the changes will increase the economic burden on any operator.
Related Service Information The FAA reviewed Rolls-Royce Airworthiness Limitations Mandatory Inspections, TRENTXWBA0520
0100A01030AD, Revision 013, dated September 1, 2019, of the Rolls-Royce Trent XWB TLM TRENTXWBK0680
TIME001, and Rolls-Royce Airworthiness Limitations Mandatory Inspections, TRENTXWBB0520
0100A01030AD, Revision 005, dated
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