Proposed Rule2022-03041
Airworthiness Directives; CFM International, S.A. Turbofan Engines
Primary source
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Published
February 15, 2022
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA proposes to adopt a new airworthiness directive (AD) for all CFM International, S.A. (CFM) LEAP-1B21, LEAP-1B23, LEAP-1B25, LEAP-1B27, LEAP-1B28, LEAP-1B28B1, LEAP-1B28B2, LEAP-1B28B2C, LEAP- 1B28B3, LEAP-1B28BBJ1, and LEAP-1B28BBJ2 model turbofan engines. This proposed AD was prompted by the detection of melt-related freckles in the billet, which may reduce the life of certain compressor rotor stages 6-10 spools, high pressure turbine (HPT) rotor mid seals, HPT rotor stage 2 disks, low pressure turbine (LPT) stage 2 disks, and LPT stage 3 disks. This proposed AD would require revising the airworthiness limitations section (ALS) of the applicable CFM LEAP-1B Engine Shop Manual (ESM), and the operator's existing approved continuous airworthiness maintenance program (CAMP) to incorporate reduced life limits for these parts. The FAA is proposing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 87 Issue 31 (Tuesday, February 15, 2022)</title>
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[Federal Register Volume 87, Number 31 (Tuesday, February 15, 2022)]
[Proposed Rules]
[Pages 8434-8436]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2022-03041]
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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. 87, No. 31 / Tuesday, February 15, 2022 /
Proposed Rules
[[Page 8434]]
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2022-0094; Project Identifier AD-2021-01251-E]
RIN 2120-AA64
Airworthiness Directives; CFM International, S.A. Turbofan
Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
-----------------------------------------------------------------------
SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)
for all CFM International, S.A. (CFM) LEAP-1B21, LEAP-1B23, LEAP-1B25,
LEAP-1B27, LEAP-1B28, LEAP-1B28B1, LEAP-1B28B2, LEAP-1B28B2C, LEAP-
1B28B3, LEAP-1B28BBJ1, and LEAP-1B28BBJ2 model turbofan engines. This
proposed AD was prompted by the detection of melt-related freckles in
the billet, which may reduce the life of certain compressor rotor
stages 6-10 spools, high pressure turbine (HPT) rotor mid seals, HPT
rotor stage 2 disks, low pressure turbine (LPT) stage 2 disks, and LPT
stage 3 disks. This proposed AD would require revising the
airworthiness limitations section (ALS) of the applicable CFM LEAP-1B
Engine Shop Manual (ESM), and the operator's existing approved
continuous airworthiness maintenance program (CAMP) to incorporate
reduced life limits for these parts. 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 April 1,
2022.
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="https://www.regulations.gov">https://www.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.
For service information identified in this NPRM, 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#b9dfd5dcdccdcaccc9c9d6cbcdf9dedc97dad6d4"><span class="__cf_email__" data-cfemail="aec8c2cbcbdadddbdedec1dcdaeec9cb80cdc1c3">[email protected]</span></a>. 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.
Examining the AD Docket
You may examine the AD docket at <a href="https://www.regulations.gov">https://www.regulations.gov</a> by
searching for and locating Docket No. FAA-2022-0094; 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.
FOR FURTHER INFORMATION CONTACT: Mehdi Lamnyi, Aviation Safety
Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803;
phone: (781) 238-7743; email: <a href="/cdn-cgi/l/email-protection#d598b0bdb1bcfb99b4b8bbacbc95b3b4b4fbb2baa3"><span class="__cf_email__" data-cfemail="f2bf979a969bdcbe939f9c8b9bb2949393dc959d84">[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-2022-0094; Project Identifier
AD-2021-01251-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="https://www.regulations.gov">https://www.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, ECO Branch, FAA, 1200 District
Avenue, Burlington, MA 01803. 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 engine manufacturer of the detection of
melt-related freckles in the billet, which may reduce the life of
certain compressor rotor stages 6-10 spools, HPT rotor mid seals, HPT
rotor stage 2 disks, LPT stage 2 disks, and LPT stage 3 disks (life-
limited parts (LLPs)). The manufacturer's investigation determined
that, as a result of such freckles forming in the billet, these LLPs
may have undetected subsurface anomalies that developed during the
manufacturing process, resulting in reduced material properties and a
lower fatigue life capability. Reduced material properties may cause
premature LLP fracture, which could result in uncontained debris
release. As a result of its investigation, the manufacturer determined
the need to reduce the life limits of these LLPs. To reflect these
reduced life limits, the manufacturer revised the CFM ALS, Chapter 05
of
[[Page 8435]]
LEAP-1B ESM. Additionally, the manufacturer published service
information that specifies procedures for the removal and replacement
of these LLPs before reaching their new life limits. The FAA is
proposing to require operators to update the ALS of the applicable CFM
LEAP-1B ESM, with the reduced life limits for these LLPs.
This condition, if not addressed, could result in uncontained
debris 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.
Related Service Information Under 1 CFR Part 51
The FAA reviewed CFM High Pressure Compressor Rotor Life Limits
LEAP-1B-05-11-02-01A-0B1B-C, Issue 009-00, dated July 26, 2021 (CFM
LEAP-1B-05-11-02-01A-0B1B-C); CFM High Pressure Turbine Rotor Life
Limits LEAP-1B-05-11-03-01A-0B1B-C, Issue 006-00, dated July 26, 2021
(CFM LEAP-1B-05-11-03-01A-0B1B-C); and CFM Low Pressure Turbine Rotor
Life Limits LEAP-1B-05-11-04-01A-0B1B-C, Issue 006-00, dated June 1,
2021 (LEAP-1B-05-11-04-01A-0B1B-C). CFM LEAP-1B-05-11-02-01A-0B1B-C
provides new high pressure compressor rotor life limits. CFM LEAP-1B-
05-11-03-01A-0B1B-C provides new HPT rotor life limits. CFM LEAP-1B-05-
11-04-01A-0B1B-C provides new LPT rotor life limits. 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.
Other Related Service Information
The FAA reviewed CFM Service Bulletin LEAP-1B-72-00-0342-01A-930A-
D, Issue 002-00, dated July 26, 2021 (LEAP-1B-72-00-0342-01A-930A-D).
LEAP-1B-72-00-0342-01A-930A-D specifies procedures for removing and
replacing the LLPs, and provides new life limits for certain serial
numbers of the LLPs.
Proposed AD Requirements in This NPRM
This proposed AD would require revising the ALS of the CFM LEAP-1B
ESM, as applicable to each affected engine model, and the operator's
existing approved CAMP to incorporate reduced life limits for certain
LLPs.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 378 engines installed on airplanes 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
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Revise ALS of Engine Manual and the 1 work-hour x $85 per $0 $85 $32,130
operator's existing approved CAMP. hour = $85.
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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-2022-0094; Project
Identifier AD-2021-01251-E.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by April 1, 2022.
(b) Affected ADs
None.
(c) Applicability
This AD applies to CFM International, S.A. (CFM) LEAP-1B21,
LEAP-1B23, LEAP-1B25, LEAP-1B27, LEAP-1B28, LEAP-1B28B1, LEAP-
1B28B2, LEAP-1B28B2C, LEAP-1B28B3, LEAP-1B28BBJ1, and LEAP-1B28BBJ2
model turbofan engines.
(d) Subject
Joint Aircraft System Component (JASC) Code 7230, Turbine Engine
Compressor Section, and JASC Code 7250, Turbine Section.
(e) Unsafe Condition
This AD was prompted by the detection of melt-related freckles
in the billet, which may reduce the life of certain compressor rotor
stages 6-10 spools, high pressure turbine (HPT) rotor mid seals, HPT
rotor stage 2
[[Page 8436]]
disks, low pressure turbine (LPT) stage 2 disks, and LPT stage 3
disks. The FAA is issuing this AD to prevent the failure of the high
pressure compressor, HPT rotor, and LPT rotor. 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
Within 60 days after the effective date of this AD, revise the
airworthiness limitations section of the applicable CFM LEAP-1B
Engine Shop Manual and the operator's existing approved continuous
airworthiness maintenance program by incorporating the following
service information:
(1) CFM High Pressure Compressor Rotor Life Limits LEAP-1B-05-
11-02-01A-0B1B-C, Issue 009-00, dated July 26, 2021; and
(2) CFM High Pressure Turbine Rotor Life Limits LEAP-1B-05-11-
03-01A-0B1B-C, Issue 006-00, dated July 26, 2021; and
(3) CFM Low Pressure Turbine Rotor Life Limits LEAP-1B-05-11-04-
01A-0B1B-C, Issue 006-00, dated June 1, 2021.
(h) Alternative Methods of Compliance (AMOCs)
(1) The Manager, ECO 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 (i)(1) of this AD and email to: <a href="/cdn-cgi/l/email-protection#20616e650d61640d616d6f63604641410e474f56"><span class="__cf_email__" data-cfemail="3978777c14787d147874767a795f5858175e564f">[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.
(i) Related Information
(1) For more information about this AD, contact Mehdi Lamnyi,
Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue,
Burlington, MA 01803; phone: (781) 238-7743; email:
<a href="/cdn-cgi/l/email-protection#3578505d515c1b7954585b4c5c755354541b525a43"><span class="__cf_email__" data-cfemail="e1ac84898588cfad808c8f9888a1878080cf868e97">[email protected]</span></a>.
(2) 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#b2d4ded7d7c6c1c7c2c2ddc0c6f2d5d79cd1dddf"><span class="__cf_email__" data-cfemail="deb8b2bbbbaaadabaeaeb1acaa9eb9bbf0bdb1b3">[email protected]</span></a>. You may view this referenced 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.
Issued on February 3, 2022.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification
Service.
[FR Doc. 2022-03041 Filed 2-14-22; 8:45 am]
BILLING CODE 4910-13-P
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