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Federal Register / Vol. 86, No. 161 / Tuesday, August 24, 2021 / Rules and Regulations DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20190597; Project Identifier 2019NE05AD; Amendment 39
21670; AD 20211608
RIN 2120AA64

Airworthiness Directives; CFM
International, S.A. Turbofan Engines Federal Aviation Administration FAA, DOT.
ACTION: Final rule.
AGENCY:

The FAA is superseding Airworthiness Directive AD 201912
05 for certain CFM International S.A.
CFM CFM565B, CFM565C, and CFM567B model turbofan engines with a certain rotating air high-pressure turbine HPT front seal. AD 201912
05 required replacement of the affected rotating air HPT front seal with a part eligible for installation. This AD was prompted by cracks found in the rotating air HPT front seal. This AD
requires replacement of affected rotating air HPT front seals installed on CFM
CFM565B, CFM565C, and CFM567B
model turbofan engines that have fewer cycles since being reconfigured than the engines affected by AD 20191205.
This AD also requires CFM565B or CFM567B model turbofan engines with a reconfigured rotating air HPT front seal that was previously operated in a CFM565C model turbofan engine to follow the removal requirements for the CFM565C model turbofan engine. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective September 28, 2021.
ADDRESSES: For service information identified in this final rule, contact CFM
International, S.A., Aviation Operations Center, 1 Neumann Way, M/D Room 285, Cincinnati, OH 45125; phone: 877
4323272; email: fleetsupport@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 781 2387759. It is also available at https www.regulations.gov by searching for and locating Docket No.
FAA20190597.

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SUMMARY:

Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20190597; or in person at Docket
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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 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:
Christopher McGuire, Aviation Safety Engineer, ECO Branch, FAA, 1200
District Avenue, Burlington, MA 01803;
phone: 781 2387120; fax: 781 238
7199; email: Chris.McGuire@faa.gov.
SUPPLEMENTARY INFORMATION:
Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 to supersede AD 20191205, Amendment 3919660 84 FR 28717, June 20, 2019, AD 20191205. AD
20191205 applied to all CFM CFM56
5B, CFM565C, and CFM567B model turbofan engines with a certain rotating air HPT front seal. AD 20191205
required replacement of the affected rotating air HPT front seal with a part eligible for installation. The actions required by AD 20191205 were interim and only addressed the highest risk engines with an affected rotating air HPT front seal that have a specified number of cycles since being reconfigured.
The NPRM published in the Federal Register on October 23, 2019 84 FR
56709. AD 20191205 was prompted by cracks found in the rotating air HPT
front seal. In the NPRM, the FAA
proposed to retain the requirements of AD 20191205 and extend those requirements to engines that have fewer cycles since being reconfigured.
After the NPRM was issued, CFM
revised its service information that provides instructions for replacing the affected rotating air HPT front seal. In addition, the revised service information addresses CFM565B or CFM567B model turbofan engines with a reconfigured rotating air HPT front seal that was previously operated in a CFM565C model turbofan engine, and specifies that those engines follow the removal limits established for CFM56
5C model turbofan engines. In addition, the FAA determined changes to the proposed AD were necessary based on comments received on the NPRM.
Accordingly, the FAA issued a supplemental notice of proposed rulemaking SNPRM, which published in the Federal Register on March 23, 2021 86 FR 15436. In the SNPRM, the FAA proposed to retain the
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requirements of AD 20191205 and expand the applicability to require the replacement of affected rotating air HPT
front seals installed on CFM CFM565B, CFM565C, and CFM567B model turbofan engines that have fewer cycles since being reconfigured than the engines affected by AD 20191205. In the SNPRM, the FAA also proposed to require that CFM565B and CFM567B
model turbofan engines with a reconfigured rotating air HPT front seal that was previously operated in a CFM565C model turbofan engine follow the removal requirements of the CFM565C model turbofan engine. The FAA is issuing this AD to address the unsafe condition on these products.
Discussion of Final Airworthiness Directive Comments The FAA received comments from one commenter on the SNPRM. The commenter was The Boeing Company Boeing. Boeing supported the proposed AD without change.
Conclusion The FAA reviewed the relevant data, considered the comments 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 SNPRM.
Related Service Information The FAA reviewed CFM Service Bulletin SB CFM565B S/B 721074, Revision 02, dated November 6, 2019;
CFM SB CFM565C S/B 720794, Revision 02, dated November 6, 2019;
and CFM SB CFM567B S/B 721042, Revision 02, dated November 6, 2019.
CFM SB CFM565B S/B 721074, Revision 02, contains procedures for replacing the affected rotating air HPT
front seal on CFM CFM565B model turbofan engines. CFM SB CFM565C S/
B 720794, Revision 02, contains procedures for replacing the affected rotating air HPT front seal on CFM
CFM565C model turbofan engines.
CFM SB CFM567B S/B 721042, Revision 02, contains procedures for replacing the affected rotating air HPT
front seal on CFM CFM567B model turbofan engines.
Costs of Compliance The FAA estimates that this AD
affects 4 engines installed on airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

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