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Federal Register / Vol. 86, No. 242 / Tuesday, December 21, 2021 / Rules and Regulations
Avenue, Suite 410, Westbury, NY 11590;
telephone 5162287300; fax 5167945531;
email 9-avs-nyaco-cos@faa.gov.
l Material Incorporated by Reference 1 The Director of the Federal Register approved the incorporation by reference IBR of the service information listed in this paragraph under 5 U.S.C. 552a and 1 CFR
part 51.
2 You must use this service information as applicable to do the actions required by this AD, unless this AD specifies otherwise.
i De Havilland Aircraft of Canada Limited Service Bulletin 8432167, dated August 12, 2021.
ii De Havilland Aircraft of Canada Limited Temporary Revision ALI0223, dated October 15, 2020.
3 For service information identified in this AD, contact De Havilland Aircraft of Canada Limited, Q-Series Technical Help Desk, 123 Garratt Boulevard, Toronto, Ontario M3K 1Y5, Canada; telephone 416
3754000; fax 4163754539; email thd@
dehavilland.com; internet https
dehavilland.com.
4 You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 2062313195.
5 You may view this service information that is incorporated by reference at the National Archives and Records Administration NARA. For information on the availability of this material at NARA, email fr.inspection@nara.gov, or go to:
https www.archives.gov/federal-register/cfr/
ibr-locations.html.
Issued on December 3, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202127709 Filed 121721; 11:15 am BILLING CODE 491013P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210869; Project Identifier AD202100176E; Amendment 3921878; AD 20212619
RIN 2120AA64

Airworthiness Directives; General Electric Company Turbofan Engines Federal Aviation Administration FAA, DOT.
ACTION: Final rule.
jspears on DSK121TN23PROD with RULES1

AGENCY:

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The FAA is adopting a new airworthiness directive AD for certain General Electric Company GE CF34
8C and CF348E model turbofan engines. This AD was prompted by a report of a quality escape during the manufacturing of a high-pressure turbine HPT rotor stage 1 disk. This AD requires removing the HPT rotor stage 1 disk from service and replacing the HPT rotor stage 1 disk with a part eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective January 25, 2022.
ADDRESSES: For service information identified in this final rule, contact General Electric Company, 1 Neumann Way, Cincinnati, OH 45215; phone:
513 5523272; email:
aviation.fleetsupport@ge.com; website:
https www.ge.com. 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 817 222
5110. It is also available at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0869.

8C5B1, CF348E2, CF348E2A1, CF34
8E5, CF348E5A1, CF348E5A2, CF34
8E6, and CF348E6A1 model turbofan engines. The NPRM published in the Federal Register on October 8, 2021 86
FR 56217. The NPRM was prompted by GE notifying the FAA of a quality escape that occurred during the manufacturing of an HPT rotor stage 1
disk. The quality escape occurred at a supplier that began production in August 2019. On November 25, 2019, the supplier discovered tool gouges at the forward chamfer on the air holes of an HPT rotor stage 1 disk. These gouges may reduce the life of the HPT rotor stage 1 disk. In the NPRM, the FAA
proposed to require removing a certain HPT rotor stage 1 disk from service and replacing the HPT rotor stage 1 disk with a part eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products.

Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210869; 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, any comments received, and other information. The address for Docket Operations 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:

The FAA reviewed the relevant data, considered the comment received, and determined that air safety requires adopting the AD as proposed.
Accordingly, the FAA is issuing this AD
to address the unsafe condition on these products. This AD is adopted as proposed in the NPRM.

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 GE CF348C5, CF34

The FAA estimates that this AD
affects 23 engines installed on airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

SUMMARY:

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Discussion of Final Airworthiness Directive Comments The FAA received a comment from one commenter, the Air Line Pilots Association ALPA. ALPA supported the NPRM without change.
Conclusion
Related Service Information The FAA reviewed GE CF348C Alert Service Bulletin ASB 72A0344 R01
and GE CF348E ASB 72A0228 R01, both dated December 19, 2019. The ASBs describe procedures for removing the HPT rotor stage 1 disk. The FAA
also reviewed GE Repair Document RD
1501811P1, dated March 17, 2020.
This document describes procedures for repairing the HPT rotor stage 1 disk.
Costs of Compliance
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