Proposed Rule2024-00377
Airworthiness Directives; CFM International, S.A. Engines
Primary source
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Published
January 11, 2024
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA proposes to adopt a new airworthiness directive (AD) for CFM International (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 proposed 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 proposed AD would require removing the affected HPT rotor interstage seals from service and replacing with a part eligible for installation. The FAA is proposing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 89 Issue 8 (Thursday, January 11, 2024)</title>
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[Federal Register Volume 89, Number 8 (Thursday, January 11, 2024)]
[Proposed Rules]
[Pages 1847-1849]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2024-00377]
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Proposed Rules
Federal Register
________________________________________________________________________
This section of the FEDERAL REGISTER contains notices to the public of
the proposed issuance of rules and regulations. The purpose of these
notices is to give interested persons an opportunity to participate in
the rule making prior to the adoption of the final rules.
========================================================================
Federal Register / Vol. 89, No. 8 / Thursday, January 11, 2024 /
Proposed Rules
[[Page 1847]]
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2024-0030; Project Identifier AD-2023-01066-E]
RIN 2120-AA64
Airworthiness Directives; CFM International, S.A. Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)
for CFM International (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
proposed 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 proposed AD would require removing
the affected HPT rotor interstage seals from service and replacing with
a part eligible for installation. The FAA is proposing this AD to
address the unsafe condition on these products.
DATES: The FAA must receive comments on this proposed AD by February
26, 2024.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
<bullet> Federal eRulemaking Portal: Go to <a href="http://regulations.gov">regulations.gov</a>. Follow
the instructions for submitting comments.
<bullet> Fax: (202) 493-2251.
<bullet> Mail: U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE, Washington, DC 20590.
<bullet> Hand Delivery: Deliver to Mail address above between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
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 NPRM, any comments received, and other
information. The street address for Docket Operations is listed above.
Material Incorporated by Reference:
<bullet> For service information identified in this NPRM, 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#5332253a32273a3c3d7d6f32733b2136356e" mailto:fleetsupport@ge.com"><span class="__cf_email__" data-cfemail="60060c050514131510100f12142007054e030f0d">[email protected]</span></a>">aviation.<a href="/cdn-cgi/l/email-protection#244248414150575154544b56506443410a474b49"><span class="__cf_email__" data-cfemail="7f19131a1a0b0c0a0f0f100d0b3f181a511c1012">[email protected]</span></a></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.
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#afc2cac7cbc681c3cec2c1d6c6efc9cece81c8c0d9"><span class="__cf_email__" data-cfemail="c4a9a1aca0adeaa8a5a9aabdad84a2a5a5eaa3abb2">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Comments Invited
The FAA invites you to send any written relevant data, views, or
arguments about this proposal. Send your comments to an address listed
under ADDRESSES. Include ``Docket No. FAA-2024-0030; Project Identifier
AD-2023-01066-E'' at the beginning of your comments. The most helpful
comments reference a specific portion of the proposal, explain the
reason for any recommended change, and include supporting data. The FAA
will consider all comments received by the closing date and may amend
this proposal because of those comments.
Except for Confidential Business Information (CBI) as described in
the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to
<a href="http://regulations.gov">regulations.gov</a>, including any personal information you provide. The
agency will also post a report summarizing each substantive verbal
contact received about this NPRM.
Confidential Business Information
CBI is commercial or financial information that is both customarily
and actually treated as private by its owner. Under the Freedom of
Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from public
disclosure. If your comments responsive to this NPRM contain commercial
or financial information that is customarily treated as private, that
you actually treat as private, and that is relevant or responsive to
this NPRM, it is important that you clearly designate the submitted
comments as CBI. Please mark each page of your submission containing
CBI as ``PROPIN.'' The FAA will treat such marked submissions as
confidential under the FOIA, and they will not be placed in the public
docket of this NPRM. Submissions containing CBI should be sent to Mehdi
Lamnyi, Aviation Safety Engineer, FAA, 2200 South 216th Street, Des
Moines, WA 98198. Any commentary that the FAA receives which is not
specifically designated as CBI will be placed in the public docket for
this rulemaking.
Background
The FAA was notified by the manufacturer of the detection of melt-
related freckles in the billet, which may reduce the life of certain
HPT rotor interstage seals. Through the manufacturer's investigation,
it was determined that these affected parts may have subsurface
anomalies that developed during the manufacturing process, resulting in
a lower life capability. This condition, if not addressed, could result
in failure of the HPT rotor interstage seal, release of uncontained
debris, damage to the engine, and damage to the airplane.
FAA's Determination
The FAA is issuing this NPRM after determining that the unsafe
condition described previously is likely to exist or develop on other
products of the same type design.
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
[[Page 1848]]
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 ADDRESSES.
Proposed AD Requirements in This NPRM
This proposed AD would require accomplishing the actions specified
in the service information already described.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 1 engine installed on an airplane of U.S. registry.
The FAA estimates the following costs to comply with this proposed
AD:
Estimated Costs
----------------------------------------------------------------------------------------------------------------
Cost per Cost on U.S.
Action Labor cost Parts cost product operators
----------------------------------------------------------------------------------------------------------------
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
The FAA determined that this proposed AD would not have federalism
implications under Executive Order 13132. This proposed AD would 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 this proposed
regulation:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Would not affect intrastate aviation in Alaska, and
(3) Would 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 Proposed Amendment
Accordingly, under the authority delegated to me by the
Administrator, the FAA proposes to amend 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:
CFM International, S.A.: Docket No. FAA-2024-0030; Project
Identifier AD-2023-01066-E.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by February 26, 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
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#60212e254d21244d212d2f23200601014e070f16"><span class="__cf_email__" data-cfemail="2869666d05696c056965676b684e4949064f475e">[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
[[Page 1849]]
Moines, WA 98198; phone: (781) 238-7743; email:
<a href="/cdn-cgi/l/email-protection#e78a828f838ec98b868a899e8ea7818686c9808891"><span class="__cf_email__" data-cfemail="93fef6fbf7fabdfff2fefdeafad3f5f2f2bdf4fce5">[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. (CFM) Service Bulletin LEAP-1A-72-
00-0492-01A-930A-D, Issue 001-00, dated April 6, 2023.
(ii) [Reserved]
(3) For service information identified in this AD, contact CFM
International, S.A., Aviation Operations Center, 1 Neumann Way, M/D
Room 285, Cincinnati, OH 45125; phone: (877) 432-3272; email:
<a href="/cdn-cgi/l/email-protection#70161c151504030500001f02043017155e131f1d"><span class="__cf_email__" data-cfemail="d7b1bbb2b2a3a4a2a7a7b8a5a397b0b2f9b4b8ba">[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#7b471a5b13091e1d46" http: www.archives.gov federal-register cfr ibr-locationsoremailfr.inspection@nara.gov">www.archives.gov/federal-register/cfr/<span class="__cf_email__" data-cfemail="8ce5eefea1e0e3efedf8e5e3e2ffe3fee9e1ede5e0eafea2e5e2fffce9eff8e5e3e2cce2edfeeda2ebe3fa">[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="29404b5b0445464a485d4046475a465b4c444840454f5b0740475a594c4a5d4046476947485b48074e465f">[email protected]</span></a></a>.
Issued on January 5, 2024.
Victor Wicklund,
Deputy Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2024-00377 Filed 1-10-24; 8:45 am]
BILLING CODE 4910-13-P
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