Proposed Rule2023-15378
Airworthiness Directives; CFM International, S.A. Engines
Primary source
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Published
July 24, 2023
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA proposes to adopt a new airworthiness directive (AD) for all CFM International, S.A. (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 (LEAP-1B) engines. This proposed AD was prompted by a manufacturer investigation that revealed that certain high-pressure turbine (HPT) rotor stage 1 disks (HPT stage 1 disks) and a certain compressor rotor stages 6-10 spool were manufactured from material suspected to have reduced material properties due to iron inclusion. This proposed AD would require replacement of certain HPT stage 1 disks and a certain compressor rotor stages 6-10 spool. The FAA is proposing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 88 Issue 140 (Monday, July 24, 2023)</title>
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[Federal Register Volume 88, Number 140 (Monday, July 24, 2023)]
[Proposed Rules]
[Pages 47404-47407]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2023-15378]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2023-1216; Project Identifier AD-2023-00502-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 all CFM International, S.A. (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 (LEAP-1B) engines. This
proposed AD was prompted by a manufacturer investigation that revealed
that certain high-pressure turbine (HPT) rotor stage 1 disks (HPT stage
1 disks) and a certain compressor rotor stages 6-10 spool were
manufactured from material suspected to have reduced material
properties due to iron inclusion. This proposed AD would require
replacement of certain HPT stage 1 disks and a certain compressor rotor
stages 6-10 spool. 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 September
7, 2023.
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-
[[Page 47405]]
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> by
searching for and locating Docket No. FAA-2023-1216; 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#107166797164797f7e3e767c757564636560607f62645077753e737f7d"><span class="__cf_email__" data-cfemail="a2c3d4cbc3d6cbcdcc8cc4cec7c7d6d1d7d2d2cdd0d6e2c5c78cc1cdcf">[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.
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#4508202d212c6b0924282b3c2c052324246b222a33"><span class="__cf_email__" data-cfemail="024f676a666b2c4e636f6c7b6b426463632c656d74">[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-2023-1216; Project Identifier
AD-2023-00502-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 iron
inclusion in three non-LEAP-1B HPT rotor disks. Further investigation
by the manufacturer determined that the iron inclusion is attributed to
deficiencies in the manufacturing process. The investigation by the
manufacturer also determined that certain LEAP-1B HPT stage 1 disks and
a certain compressor rotor stages 6-10 spool manufactured using the
same process may have reduced material properties and a lower fatigue
life capability due to iron inclusion, which may cause premature
fracture and subsequent uncontained failure of certain HPT stage 1
disks and a certain compressor rotor stages 6-10 spool. This condition,
if not addressed, could result in uncontained debris release, damage to
the engine, and damage to the aircraft.
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-1B-72-00-0392-01A-930A-
D, Issue 001, dated March 7, 2023. This service information identifies
the part numbers and serial numbers of HPT stage 1 disks and a
compressor rotor stages 6-10 spool with potentially reduced material
properties and specifies procedures for replacement of these parts.
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 replacement of certain HPT stage 1
disks and a certain compressor rotor stages 6-10 spool. This proposed
AD would also prohibit installation of an HPT stage 1 disk or
compressor rotor stages 6-10 spool that has a part number and serial
number identified in the service information onto any engine.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 39 engines installed on airplanes of U.S. registry. These 39
engines would require replacement of the HPT stage 1 disk. The FAA
estimates that there are no engines installed on airplanes of U.S.
registry that would require replacement of the compressor rotor stages
6-10 spool.
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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Replace HPT stage 1 disk.......... 8 work-hours x $85 $215,635 (pro-rated). $216,315 $8,436,285
per hour = $680.
Replace compressor rotor stages 6- 8 work-hours x $85 $37,660 (pro-rated).. 38,340 0
10 spool. per hour = $680.
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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-2023-1216; Project
Identifier AD-2023-00502-E.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by September 7, 2023.
(b) Affected ADs
None.
(c) Applicability
This AD applies to CFM International, S.A. (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.
(d) Subject
Joint Aircraft System Component (JASC) Code 7230, Turbine Engine
Compressor Section; 7250, Turbine Section.
(e) Unsafe Condition
This AD was prompted by a manufacturer investigation that
revealed that certain high-pressure turbine (HPT) rotor stage 1
disks (HPT stage 1 disks) and a certain compressor rotor stages 6-10
spool were manufactured from material suspected to have reduced
material properties due to iron inclusion. The FAA is issuing this
AD to prevent fracture and subsequent uncontained failure of certain
HPT stage 1 disks and a certain compressor rotor stages 6-10 spool.
The unsafe condition, if not addressed, could result in uncontained
debris release, damage to the engine, and damage to the aircraft.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Required Actions
(1) For engines with an installed HPT stage 1 disk having a part
number (P/N) and serial number (S/N) identified in Compliance,
paragraph 3.E., Tables 1 through 2, of CFM Service Bulletin (SB)
LEAP-1B-72-00-0392-01A-930A-D, Issue 001, dated March 7, 2023 (CFM
SB LEAP-1B-72-00-0392-01A-930A-D): At the next piece-part exposure
of the HPT stage 1 disk, or before exceeding the applicable cycles
since new (CSN) threshold identified in Compliance, paragraph 3.E.,
Tables 1 through 2, of CFM SB LEAP-1B-72-00-0392-01A-930A-D,
whichever occurs first after the effective date of this AD; or if
the applicable CSN threshold has been exceeded as of the effective
date of this AD, within 50 flight cycles (FCs) from the effective
date of this AD; remove the HPT stage 1 disk from service and
replace with a part eligible for installation.
(2) For engines with an installed compressor rotor stages 6-10
spool having a P/N and S/N identified in Compliance, paragraph 3.E.,
Table 3, of CFM SB LEAP-1B-72-00-0392-01A-930A-D: At the next piece-
part exposure of the compressor rotor stages 6-10 spool, or before
exceeding the applicable CSN threshold identified in Compliance,
paragraph 3.E., Table 3, of CFM SB LEAP-1B-72-00-0392-01A-930A-D,
whichever occurs first after the effective date of this AD; or if
the applicable CSN threshold has been exceeded as of the effective
date of this AD, within 50 FCs from the effective date of this AD;
remove the compressor rotor stages 6-10 spool from service and
replace with a part eligible for installation.
(h) Definition
For the purpose of this AD, a ``part eligible for installation''
is an HPT stage 1 disk or compressor rotor stages 6-10 spool that
does not have a P/N and S/N identified in Compliance, paragraph
3.E., Tables 1 through 3 of CFM SB LEAP-1B-72-00-0392-01A-930A-D.
(i) Installation Prohibition
After the effective date of this AD, do not install an HPT stage
1 disk or compressor rotor stages 6-10 spool that has a P/N and S/N
identified in Compliance, paragraph 3.E., Tables 1 through 3 of CFM
SB LEAP-1B-72-00-0392-01A-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 certification office,
send it to the attention of the person identified in paragraph (k)
of this AD and email to: <a href="/cdn-cgi/l/email-protection#94d5dad1b9d5d0b9d5d9dbd7d4f2f5f5baf3fbe2"><span class="__cf_email__" data-cfemail="b7f6f9f29af6f39af6faf8f4f7d1d6d699d0d8c1">[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) Related 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" class="__cf_email__" data-cfemail="95f8f0fdf1fcbbf9f4f8fbecfcd5f3f4f4bbf2fae3">[email protected]</a>.
(l) 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-1B-72-00-0392-
01A-930A-D, Issue 001, dated March 7, 2023.
(ii) [Reserved]
(3) For service information 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#e584938c84918c8a8bcb8389808091969095958a9791a58280cb868a88"><span class="__cf_email__" data-cfemail="1d7c6b747c69747273337b717878696e686d6d726f695d7a78337e7270">[email protected]</span></a>.
[[Page 47407]]
(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 service information that is incorporated
by reference at the National Archives and Records Administration
(NARA). For information on the availability of this material at
NARA, email: <a href="/cdn-cgi/l/email-protection#87e1f5a9eee9f4f7e2e4f3eee8e9c7e9e6f5e6a9e0e8f1"><span class="__cf_email__" data-cfemail="2442560a4d4a57544147504d4b4a644a4556450a434b52">[email protected]</span></a>, or go to: <a href="http://www.archives.gov/federal-register/cfr/ibr-locations.html">www.archives.gov/federal-register/cfr/ibr-locations.html</a>.
Issued on June 12, 2023.
Ross Landes,
Deputy Director for Regulatory Operations, Compliance & Airworthiness
Division, Aircraft Certification Service.
[FR Doc. 2023-15378 Filed 7-21-23; 8:45 am]
BILLING CODE 4910-13-P
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