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Federal Register / Vol. 86, No. 110 / Thursday, June 10, 2021 / Rules and Regulations 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
0187.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210187; 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 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:
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
Conclusion
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to certain CFM LEAP1A23, LEAP1A24, LEAP1A24E1, LEAP
1A26, LEAP1A26CJ, LEAP1A26E1, LEAP1A29, LEAP1A29CJ, LEAP
1A30, LEAP1A32, LEAP1A33, LEAP
1A33B2, and LEAP1A35A model turbofan engines. The NPRM published in the Federal Register on March 23, 2021 86 FR 15443. The NPRM was prompted by a report of a manufacturing quality escape found during an inspection of an HPT case. In the NPRM, the FAA proposed to require the removal from service of the affected HPT case. The FAA is issuing this AD
to address the unsafe condition on these products.

The FAA reviewed the relevant data 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. This AD is adopted as proposed in the NPRM.

Discussion of Final Airworthiness Directive
Costs of Compliance
Comments The FAA received no comments on the NPRM or on the determination of the costs.

Related Service Information Under 1
CFR Part 51
The FAA reviewed CFM Service Bulletin SB LEAP1A72000421
01A930AD, Issue 001, dated October 22, 2020. This SB specifies procedures for replacing the affected HPT cases.
This service information is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in ADDRESSES.

The FAA estimates that this AD
affects 8 engines installed on airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

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ESTIMATED COSTS
Action
Labor cost
Remove and replace the HPT case

1 work-hour $85 per hour = $85

Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII:
Aviation Programs, describes in more detail the scope of the Agencys authority.
The FAA is issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701: General requirements. Under that section, Congress charges the FAA
with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce.
This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.
Regulatory Findings This AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct effect on the States, on
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Parts cost
the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government.
For the reasons discussed above, I
certify that this AD:
1 Is not a significant regulatory action under Executive Order 12866, 2 Will not affect intrastate aviation in Alaska, and 3 Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
The Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:

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$217,600

Cost per product
Cost on U.S.
operators
$217,685

$1,741,480

PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

20211121 CFM International, S.A.:
Amendment 3921583; Docket No.
FAA20210187; Project Identifier AD
202001664E.
a Effective Date This airworthiness directive AD is effective July 15, 2021.
b Affected ADs None.
c Applicability This AD applies to CFM International, S.A.
CFM LEAP1A23, LEAP1A24, LEAP
1A24E1, LEAP1A26, LEAP1A26CJ, LEAP
1A26E1, LEAP1A29, LEAP1A29CJ, LEAP
1A30, LEAP1A32, LEAP1A33, LEAP
1A33B2, and LEAP1A35A model turbofan engines, with a high-pressure turbine HPT
case, part number P/N 2668M94G01, that
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