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Federal Register / Vol. 86, No. 170 / Tuesday, September 7, 2021 / Rules and Regulations
with the actions required by paragraph g1
of this AD.
3 The actions required by paragraphs g1 and 2 of this AD may be performed by the owner/operator pilot holding at least a private pilot certificate and must be entered into the aircraft records showing compliance with this AD in accordance with 43.9a1
through 4 and 91.417a2v. The record must be maintained as required by 91.417, 121.380, or 135.439.
h Alternative Methods of Compliance AMOCs 1 The Manager, International Validation Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or local Flight Standards District Office, as appropriate. If sending information directly to the manager of the International Validation Branch, send it to the attention of the person identified in paragraph i1 of this AD.
Information may be emailed to: 9-AVS-AIR730-AMOC@faa.gov.
2 Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/
certificate holding district office.
i Related Information 1 For more information about this AD, contact Mitch Soth, Flight Test Engineer, Southwest Section, Flight Test Branch, Compliance & Airworthiness Division, FAA, 10101 Hillwood Pkwy., Fort Worth, TX
76177; telephone 817 2225110; email mitch.soth@faa.gov.
2 The subject of this AD is addressed in Transport Canada Emergency AD CF2019
16, dated May 6, 2019. You may view the Transport Canada AD on the internet at https www.regulations.gov in Docket No.
FAA20210497.
j Material Incorporated by Reference None.
Issued on August 26, 2021.
Gaetano A. Sciortino, Deputy Director for Strategic Initiatives, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202119049 Filed 9321; 8:45 am
lotter on DSK11XQN23PROD with RULES1

BILLING CODE 491013P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210381; Project Identifier MCAI202001656E; Amendment 3921694; AD 20211711
RIN 2120AA64

Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG Type Certificate Previously Held by RollsRoyce plc Turbofan Engines Federal Aviation Administration FAA, DOT.
ACTION: Final rule.
AGENCY:

The FAA is adopting a new airworthiness directive AD for certain Rolls-Royce Deutschland Ltd & Co KG
RRD Trent XWB75, Trent XWB79, Trent XWB79B, and Trent XWB84
model turbofan engines. This AD was prompted by reports of cracks in the intermediate-pressure compressor IPC
rotor 1 R1 blades installed on certain Trent XWB model turbofan engines.
This AD requires 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 issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective October 12, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of October 12, 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; fax: +44 01332
249936; website: https www.rollsroyce.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 781 238
7759. It is also available at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0381.
SUMMARY:

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
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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, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
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:
Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to certain RRD Trent XWB75, Trent XWB79, Trent XWB79B, and Trent XWB84 model turbofan engines.
The NPRM published in the Federal Register on May 28, 2021 86 FR 28716.
The NPRM was prompted by reports of cracks in the IPC R1 blades installed on certain Trent XWB model turbofan engines. The NPRM proposed to require initial and repetitive BSIs of the affected IPC R1 blades and, depending on the results of the inspections, replacement of all 34 IPC R1 blades with parts eligible for installation. 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 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
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.

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