Proposed Rule2024-25869
Airworthiness Directives; CFM International, S.A. Engines
Primary source
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Published
November 8, 2024
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA proposes to adopt a new airworthiness directive (AD) for certain CFM International, S.A. (CFM) Model LEAP-1A, LEAP-1B, and LEAP-1C engines. This proposed AD was prompted by a manufacturer investigation that revealed a quality escape for low-pressure turbine (LPT) disks made from forgings with nonconforming grain size. This proposed AD would require removal and replacement of the LPT stage 4 and stage 5 disks. 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 217 (Friday, November 8, 2024)</title>
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[Federal Register Volume 89, Number 217 (Friday, November 8, 2024)]
[Proposed Rules]
[Pages 88681-88683]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2024-25869]
[[Page 88681]]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2024-2424; Project Identifier AD-2024-00416-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 certain CFM International, S.A. (CFM) Model LEAP-1A, LEAP-1B, and
LEAP-1C engines. This proposed AD was prompted by a manufacturer
investigation that revealed a quality escape for low-pressure turbine
(LPT) disks made from forgings with nonconforming grain size. This
proposed AD would require removal and replacement of the LPT stage 4
and stage 5 disks. 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 December
23, 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-2024-2424; 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 CFM material identified in this proposed AD, 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#d3b2a5bab2a7babcbdfdb5bfb6b6a7a0a6a3a3bca1a793b4b6fdb0bcbe"><span class="__cf_email__" data-cfemail="96f7e0fff7e2fff9f8b8f0faf3f3e2e5e3e6e6f9e4e2d6f1f3b8f5f9fb">[email protected]</span></a>.
<bullet> You may view this material 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#87eae2efe3eea9ebe6eae9feeec7e1e6e6a9e0e8f1"><span class="__cf_email__" data-cfemail="5b363e333f3275373a363522321b3d3a3a753c342d">[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 the ADDRESSES section. Include ``Docket No. FAA-2024-2424;
Project Identifier AD-2024-00416-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 revise 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 received a report of a quality escape on LPT disks made
from forgings with nonconforming material grain size on certain CFM
Model LEAP-1A and LEAP-1B engines. The supplier assessed the duplex
micro-structure using an arithmetic average grain size instead of
considering the coarsest grain size. After a re-check of all forgings,
the supplier has identified a number of parts with a coarse grain size
that is below the drawing requirement.
This condition, if not addressed, could result in uncontained part
release, 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.
Material Incorporated by Reference Under 1 CFR Part 51
The FAA reviewed CFM Service Bulletin (SB) LEAP-1A-72-00-0519-01A-
930A-D, Issue 001-00, dated September 18, 2024 (CFM SB LEAP-1A-72-00-
0519-01A-930A-D); CFM SB LEAP-1B-72-00-0419-01A-930A-D, Issue 001-00,
dated September 18, 2024 (CFM SB LEAP-1B-72-00-0419-01A-930A-D); and
CFM SB LEAP-1C-72-00-0100-01A-930A-D, Issue 001-00, dated September 18,
2024. This material specifies the part numbers and serial numbers of
affected LPT disks, and the cycles since new thresholds for the
replacement of affected LPT disks. These documents are distinct because
they apply to different engine models. This material 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.
Proposed AD Requirements in This NPRM
This proposed AD would require removal and replacement of the LPT
stage 4 and stage 5 disks at the next piece-part exposure, or before
exceeding between 2,400 and 19,000 cycles since new, depending on the
applicable threshold identified in CFM SB LEAP-1A-72-00-0519-01A-930A-D
or CFM SB LEAP-1B-72-00-0419-01A-930A-D.
[[Page 88682]]
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 13 engines installed on airplanes of U.S. registry.
The FAA estimates the following costs to comply with this proposed
AD:
Estimated Costs
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Cost per Cost on U.S.
Action Labor cost Parts cost product operators
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Remove and replace LEAP-1A LPT stage 5 150 work-hours x $85 per $225,500 $238,250 $476,500
disk. hour = $12,750.
Remove and replace LEAP-1B LPT stage 5 150 work-hours x $85 per 205,100 217,850 1,742,800
disk. hour = $12,750.
Remove and replace LEAP-1B LPT stage 4 150.00 work-hours x $85 per 442,800 455,550 1,366,650
disk. hour = $12,750.
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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-2024-2424; Project
Identifier AD-2024-00416-E.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by December 23, 2024.
(b) Affected ADs
None.
(c) Applicability
This AD applies to the following CFM International, S.A. (CFM)
Model engines:
(1) LEAP-1A23, LEAP-1A24, LEAP-1A24E1, LEAP-1A26, LEAP-1A26CJ,
LEAP-1A26E1, LEAP-1A29, LEAP-1A29CJ, LEAP-1A30, LEAP-1A32, LEAP-
1A33, LEAP-1A33B2, LEAP-1A35A;
(2) LEAP-1B21, LEAP-1B23, LEAP-1B25, LEAP-1B27, LEAP-1B28, LEAP-
1B28B1, LEAP-1B28B2, LEAP-1B28B2C, LEAP-1B28B3, LEAP-1B28BBJ1, LEAP-
1B28BBJ2; and
(3) LEAP-1C28, LEAP-1C30, and LEAP-1C30B1.
(d) Subject
Joint Aircraft System Component (JASC) Code 7250, Turbine
Section.
(e) Unsafe Condition
This AD was prompted by a manufacturer investigation that
revealed a quality escape for certain low-pressure turbine (LPT)
disks made from forgings with nonconforming grain size. The FAA is
issuing this AD to prevent the fracture and uncontained failure of
certain LPT stage 4 and stage 5 disks. The unsafe condition, if not
addressed, could result in uncontained part release, 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
(1) For LEAP-1A engines with an installed LPT stage 5 disk
having a part number (P/N) and serial number (S/N) listed in Table
1, Table 2, or Table 3 of CFM Service Bulletin (SB) LEAP-1A-72-00-
0519-01A-930A-D, Issue 001-00, dated September 18, 2024 (CFM SB
LEAP-1A-72-00-0519-01A-930A-D): At the next piece-part exposure of
the LPT stage 5 disk, or before exceeding the applicable cycles
since new (CSN) threshold identified in Table 1, Table 2, or Table 3
of CFM SB LEAP-1A-72-00-0519-01A-930A-D, whichever occurs first
after the effective date of this AD, remove the LPT stage 5 disk
from service and replace with a part eligible for installation.
(2) For LEAP-1B engines with an installed LPT stage 4 disk
having a P/N and S/N listed in Table 1 of CFM SB LEAP-1B-72-00-0419-
01A-930A-D, Issue 001-00, dated September 18, 2024 (CFM SB LEAP-1B-
72-00-0419-01A-930A-D): At the next piece-part exposure of the LPT
stage 4 disk, or before exceeding the applicable CSN threshold
identified in Table 1 of CFM SB LEAP-1B-72-00-0419-01A-930A-D,
whichever occurs first after the effective date of this AD, remove
the LPT stage 4 disk from service and replace with a part eligible
for installation.
(3) For LEAP-1B engines with an installed LPT stage 5 disk
having a P/N and S/N listed in Table 2 or Table 3 of CFM SB LEAP-1B-
72-00-0419-01A-930A-D: At the next piece-part exposure of the LPT
stage 5 disk, or before exceeding the applicable CSN threshold
identified in Table 2 or Table 3 of CFM SB LEAP-1B-72-00-0419-01A-
930A-D, whichever occurs first after the effective date of this AD,
remove the LPT stage 5 disk from service and replace with a part
eligible for installation.
(h) Installation Prohibition
(1) After the effective date of this AD, do not install an LPT
stage 5 disk that has a P/N and S/N identified in Table 1, Table 2,
or Table 3, of CFM SB LEAP-1A-72-00-0519-01A-930A-D, in any LEAP-1A
engine.
(2) After the effective date of this AD, do not install an LPT
stage 4 disk or LPT stage 5 disk that has a P/N and S/N identified
in
[[Page 88683]]
Table 1, Table 2, or Table 3, of CFM SB LEAP-1B-72-00-0419-01A-930A-
D in any LEAP-1B engine.
(3) After the effective date of this AD, do not install an LPT
stage 5 disk that has a P/N and S/N identified in Table 1 of CFM SB
LEAP-1C-72-00-0100-01A-930A-D, Issue 001-00, dated September 18,
2024, in any LEAP-1C engine.
(i) Definitions
For the purpose of this AD:
(1) ``LEAP-1A engines'' are 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.
(2) ``LEAP-1B engines'' are CFM Model LEAP-1B21, LEAP-1B23,
LEAP-1B25, LEAP-1B27, LEAP-1B28, LEAP-1B28B1, LEAP-1B28B2, LEAP-
1B28B2C, LEAP-1B28B3, LEAP-1B28BBJ1, and LEAP-1B28BBJ2 engines.
(3) ``LEAP-1C engines'' are CFM Model LEAP-1C28, LEAP-1C30, and
LEAP-1C30B1 engines.
(4) A ``part eligible for installation'' on a LEAP-1A engine is
an LPT stage 5 disk that does not have a P/N and S/N identified in
Table 1, Table 2, or Table 3 of CFM SB LEAP-1A-72-00-0519-01A-930A-
D.
(5) A ``part eligible for installation'' on a LEAP-1B engine is
an LPT stage 4 disk or LPT stage 5 disk that does not have a P/N and
S/N identified in Table 1, Table 2, or Table 3 of CFM SB LEAP-1B-72-
00-0419-01A-930A-D.
(j) 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 (l) of this AD and email to: <a href="/cdn-cgi/l/email-protection#02434f4d41426463632c656d74"><span class="__cf_email__" data-cfemail="3e7f73717d7e585f5f10595148">[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.
(k) 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#6a070f020e0344060b070413032a0c0b0b440d051c"><span class="__cf_email__" data-cfemail="cca1a9a4a8a5e2a0ada1a2b5a58caaadade2aba3ba">[email protected]</span></a>.
(l) Material Incorporated by Reference
(1) The Director of the Federal Register approved the
incorporation by reference (IBR) of the material listed in this
paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) You must use this material as applicable to do the actions
required by this AD, unless the AD specifies otherwise.
(i) CFM Service Bulletin (SB) LEAP-1A-72-00-0519-01A-930A-D,
Issue 001-00, dated September 18, 2024.
(ii) CFM SB LEAP-1B-72-00-0419-01A-930A-D, Issue 001-00, dated
September 18, 2024.
(iii) CFM SB LEAP-1C-72-00-0100-01A-930A-D, Issue 001-00, dated
September 18, 2024.
(3) For CFM material identified in this AD, 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#2445524d45504d4b4a0a4248414150575154544b56506443410a474b49"><span class="__cf_email__" data-cfemail="2c4d5a454d58454342024a404949585f595c5c435e586c4b49024f4341">[email protected]</span></a>.
(4) You may view this material 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.
(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="http://www.archives.gov/federal-register/cfr/ibr-locations">www.archives.gov/federal-register/cfr/ibr-locations</a> or email <a href="/cdn-cgi/l/email-protection#771105591e1904071214031e1819371916051659101801"><span class="__cf_email__" data-cfemail="c7a1b5e9aea9b4b7a2a4b3aea8a987a9a6b5a6e9a0a8b1">[email protected]</span></a>.
Issued on November 4, 2024.
Peter A. White,
Deputy Director, Integrated Certificate Management Division, Aircraft
Certification Service.
[FR Doc. 2024-25869 Filed 11-7-24; 8:45 am]
BILLING CODE 4910-13-P
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