Rule2024-09564
Airworthiness Directives; CFM International, S.A. Engines
Primary source
Metadata and text below are from the Federal Register, a public-domain U.S. government work. Always verify the official published version before relying on it for any legal matter.
Published
May 6, 2024
Effective
June 10, 2024
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is adopting a new airworthiness directive (AD) for CFM International, S.A. (CFM) Model LEAP-1A23, LEAP-1A24, LEAP-1A24E1, LEAP-1A26, LEAP-1A26CJ, LEAP-1A26E1, LEAP-1A29, LEAP-1A29CJ, LEAP-1A30, LEAP-1A32, LEAP-1A33, LEAP-1A33B2, and LEAP-1A35A engines. This AD was prompted by detection of melt-related freckles in the billet, which may reduce the life of certain high-pressure turbine (HPT) rotor interstage seals. This AD requires removing the affected HPT rotor interstage seals from service and replacing with a part eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 89 Issue 88 (Monday, May 6, 2024)</title>
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[Federal Register Volume 89, Number 88 (Monday, May 6, 2024)]
[Rules and Regulations]
[Pages 37111-37113]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2024-09564]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2024-0030; Project Identifier AD-2023-01066-E;
Amendment 39-22722; AD 2024-07-02]
RIN 2120-AA64
Airworthiness Directives; CFM International, S.A. Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for CFM
International, S.A. (CFM) Model LEAP-1A23, LEAP-1A24, LEAP-1A24E1,
LEAP-1A26, LEAP-1A26CJ, LEAP-1A26E1, LEAP-1A29, LEAP-1A29CJ, LEAP-1A30,
LEAP-1A32, LEAP-1A33, LEAP-1A33B2, and LEAP-1A35A engines. This AD was
prompted by detection of melt-related freckles in the billet, which may
reduce the life of certain high-pressure turbine (HPT) rotor interstage
seals. This AD requires removing the affected HPT rotor interstage
seals from service and replacing 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 June 10, 2024.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of June 10,
2024.
ADDRESSES:
AD Docket: You may examine the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2024-0030; 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, M-30, West Building Ground Floor,
Room W12-140, 1200 New Jersey Avenue SE, Washington, DC 20590.
Material Incorporated by Reference:
[[Page 37112]]
<bullet> For service information identified, contact CFM
International, S.A., GE Aviation Fleet Support, 1 Neumann Way, M/D Room
285, Cincinnati, OH 45215; phone: (877) 432-3272; email:
<a href="/cdn-cgi/l/email-protection#e687908f87928f8988c8808a83839295939696899492a68183c885898b"><span class="__cf_email__" data-cfemail="5736213e36233e383979313b323223242227273825231730327934383a">[email protected]</span></a>.
<bullet> 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 <a href="http://regulations.gov">regulations.gov</a> under Docket No. FAA-2024-0030.
FOR FURTHER INFORMATION CONTACT: Mehdi Lamnyi, Aviation Safety
Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; phone:
(781) 238-7743; email: <a href="/cdn-cgi/l/email-protection#3f525a575b5611535e525146567f595e5e11585049"><span class="__cf_email__" data-cfemail="264b434e424f084a474b485f4f6640474708414950">[email protected]</span></a>.
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 CFM Model LEAP-1A23,
LEAP-1A24, LEAP-1A24E1, LEAP-1A26, LEAP-1A26CJ, LEAP-1A26E1, LEAP-1A29,
LEAP-1A29CJ, LEAP-1A30, LEAP-1A32, LEAP-1A33, LEAP-1A33B2, and LEAP-
1A35A engines. The NPRM published in the Federal Register on January
11, 2024 (89 FR 1847). The NPRM was prompted by detection of melt-
related freckles in the billet, which may reduce the life of certain
HPT rotor interstage seals. In the NPRM, the FAA proposed to require
removing the affected HPT rotor interstage seals from service and
replacing with a part eligible for installation. The FAA is issuing
this AD to address the unsafe condition on these products.
Discussion of Final Airworthiness Directive
Comments
The FAA received no comments on the NPRM or on the determination of
the costs.
Conclusion
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. Except for
minor editorial changes, this AD is adopted as proposed in the NPRM.
Related Service Information Under 1 CFR Part 51
The FAA reviewed CFM Service Bulletin LEAP-1A-72-00-0492-01A-930A-
D, Issue 001-00, dated April 6, 2023, which provides the serial numbers
of the affected HPT rotor interstage seals and specifies procedures for
replacement of the HPT rotor interstage seal. 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 the ADDRESSES section.
Costs of Compliance
The FAA estimates that this AD affects 1 engine installed on an
airplane of U.S. registry.
The FAA estimates the following costs to comply with this AD:
Estimated Costs
----------------------------------------------------------------------------------------------------------------
Cost per Cost on U.S.
Action Labor cost Parts cost product operators
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Remove HPT rotor interstage seal.... 225 work-hours x $85 $168,000 $187,125 $187,125
per hour = $19,125.
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Authority for This Rulemaking
Title 49 of the United States Code specifies the FAA's 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 Agency's 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 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:
PART 39--AIRWORTHINESS DIRECTIVES
0
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
0
2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive:
2024-07-02 CFM International, S.A.: Amendment 39-22722; Docket No.
FAA-2024-0030; Project Identifier AD-2023-01066-E.
(a) Effective Date
This airworthiness directive (AD) is effective June 10, 2024.
(b) Affected ADs
None.
(c) Applicability
This AD applies to CFM International, S.A. (CFM) Model LEAP-
1A23, LEAP-1A24, LEAP-1A24E1, LEAP-1A26, LEAP-1A26CJ, LEAP-1A26E1,
LEAP-1A29, LEAP-1A29CJ, LEAP-1A30, LEAP-1A32, LEAP-1A33, LEAP-
1A33B2, and LEAP-1A35A engines.
(d) Subject
Joint Aircraft System Component (JASC) Code 7250, Turbine
Section.
(e) Unsafe Condition
This AD was prompted by detection of melt-related freckles in
the billet, which may reduce the life of certain high-pressure
[[Page 37113]]
turbine (HPT) rotor interstage seals. The FAA is issuing this AD to
prevent failure of the HPT rotor interstage seal. The unsafe
condition, if not addressed, could result in release of uncontained
debris, damage to the engine, and damage to the airplane.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Required Actions
For engines with an affected HPT rotor interstage seal
installed, before exceeding the applicable threshold specified in
Table 1 of paragraph 3.E., Compliance, of CFM Service Bulletin (SB)
LEAP-1A-72-00-0492-01A-930A-D, Issue 001-00, dated April 6, 2023
(CFM SB LEAP-1A-72-00-0492-01A-930A-D, Issue 001-00), or at the next
HPT rotor module exposure, whichever occurs first after the
effective date of this AD, remove the affected HPT rotor interstage
seal from service and replace it with a part eligible for
installation.
(h) Definitions
(1) For the purpose of this AD, an ``affected HPT rotor
interstage seal'' is any HPT rotor interstage seal having part
number 2466M68P02 and a serial number listed in Table 1 of paragraph
3.E., Compliance, of CFM SB LEAP-1A-72-00-0492-01A-930A-D, Issue
001-00.
(2) For the purpose of this AD, a ``part eligible for
installation'' is any HPT rotor interstage seal having a serial
number that is not listed in Table 1 of paragraph 3.E., Compliance,
of CFM SB LEAP-1A-72-00-0492-01A-930A-D, Issue 001-00.
(3) For the purpose of this AD, an ``HPT rotor module exposure''
is an engine shop visit during which the HPT rotor assembly is fully
removed from the engine core.
(i) Alternative Methods of Compliance (AMOCs)
(1) The Manager, AIR-520 Continued Operational Safety 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 AIR-520 Continued
Operational Safety Branch, send it to the attention of the person
identified in paragraph (j) of this AD and email to <a href="/cdn-cgi/l/email-protection#50111e157d11147d111d1f13103631317e373f26"><span class="__cf_email__" data-cfemail="44050a016905006905090b07042225256a232b32">[email protected]</span></a>.
(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.
(j) Additional Information
For more information about this AD, contact Mehdi Lamnyi,
Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines,
WA 98198; phone: (781) 238-7743; email: <a href="/cdn-cgi/l/email-protection#b8d5ddd0dcd196d4d9d5d6c1d1f8ded9d996dfd7ce"><span class="__cf_email__" data-cfemail="771a121f131e591b161a190e1e3711161659101801">[email protected]</span></a>.
(k) 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. 552(a) and 1 CFR part 51.
(2) You must use this service information as applicable to do
the actions required by this AD, unless the AD specifies otherwise.
(i) CFM International, S.A. Service Bulletin LEAP-1A-72-00-0492-
01A-930A-D, Issue 001-00, dated April 6, 2023.
(ii) [Reserved]
(3) For service information, contact CFM International, S.A., GE
Aviation Fleet Support, 1 Neumann Way, M/D Room 285, Cincinnati, OH
45215; phone: (877) 432-3272; email: <a href="/cdn-cgi/l/email-protection#84e5f2ede5f0edebeaaae2e8e1e1f0f7f1f4f4ebf6f0c4e3e1aae7ebe9"><span class="__cf_email__" data-cfemail="204156494154494f4e0e464c454554535550504f52546047450e434f4d">[email protected]</span></a>.
(4) You may view this service information at 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.
(5) You may view this material at the National Archives and
Records Administration (NARA). For information on the availability
of this material at NARA, visit <a href="/cdn-cgi/l/email-protection#1a267b3a72687f7c27" http: www.archives.gov federal-register cfr ibr-locationsoremailfr.inspection@nara.gov">www.archives.gov/federal-register/cfr/<span class="__cf_email__" data-cfemail="39505b4b1455565a584d5056574a564b5c545850555f4b1750574a495c5a4d5056577957584b58175e564f">[email protected]</span></a>"><a href="http://www.archives.gov/federal-register/cfr/ibr-locationsoremailfr.inspection@nara.gov">www.archives.gov/federal-register/cfr/<span class="__cf_email__" data-cfemail="2d444f5f0041424e4c594442435e425f48404c44414b5f0344435e5d484e594442436d434c5f4c034a425b">[email protected]</span></a></a>.
Issued on March 27, 2024.
Victor Wicklund,
Deputy Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2024-09564 Filed 5-3-24; 8:45 am]
BILLING CODE 4910-13-P
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