Proposed Rule2022-26121
Airworthiness Directives; CFM International, S.A. Turbofan Engines
Primary source
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Published
December 1, 2022
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA proposes to adopt a new airworthiness directive (AD) for certain CFM International, S.A. (CFM) LEAP-1B turbofan engines. This proposed AD was prompted by a report of multiple aborted takeoffs and air turn-backs (ATBs) caused by high-pressure compressor (HPC) stall, which was induced by high levels of non-synchronous vibration (NSV). A subsequent investigation by the manufacturer revealed that wear on the No. 3 bearing spring finger housing can lead to high levels of NSV. This proposed AD would require repetitive calculations of the oil filter delta pressure (OFDP) data and, depending on the results of the calculation, replacement of the No. 3 bearing spring finger housing. This proposed AD would also prohibit installation of an engine with an affected No. 3 bearing spring finger housing onto an airplane that already has one engine with an affected No. 3 bearing spring finger housing installed. 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 230 (Thursday, December 1, 2022)</title>
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[Federal Register Volume 87, Number 230 (Thursday, December 1, 2022)]
[Proposed Rules]
[Pages 73686-73688]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2022-26121]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2022-1422; Project Identifier AD-2022-01208-E]
RIN 2120-AA64
Airworthiness Directives; CFM International, S.A. Turbofan
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) LEAP-1B turbofan engines.
This proposed AD was prompted by a report of multiple aborted takeoffs
and air turn-backs (ATBs) caused by high-pressure compressor (HPC)
stall, which was induced by high levels of non-synchronous vibration
(NSV). A subsequent investigation by the manufacturer revealed that
wear on the No. 3 bearing spring finger housing can lead to high levels
of NSV. This proposed AD would require repetitive calculations of the
oil filter delta pressure (OFDP) data and, depending on the results of
the calculation, replacement of the No. 3 bearing spring finger
housing. This proposed AD would also prohibit installation of an engine
with an affected No. 3 bearing spring finger housing onto an airplane
that already has one engine with an affected No. 3 bearing spring
finger housing installed. 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 January 17,
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-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-2022-1422; 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 service information identified in this NPRM,
contact CFM International Inc., 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#1372657a72677a7c7d3d757f767667606663637c61675374763d707c7e"><span class="__cf_email__" data-cfemail="f594839c94819c9a9bdb9399909081868085859a8781b59290db969a98">[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, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803;
phone: (781) 238-7743; email: <a href="/cdn-cgi/l/email-protection#6b260e030f0245270a060512022b0d0a0a450c041d"><span class="__cf_email__" data-cfemail="9fd2faf7fbf6b1d3fef2f1e6f6dff9fefeb1f8f0e9">[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-2022-1422; Project Identifier
AD-2022-01208-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
[[Page 73687]]
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, 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 three aborted
takeoffs and two ATBs caused by HPC stall. A subsequent investigation
by the manufacturer revealed that wear on the No. 3 bearing spring
finger housing can lead to high levels of NSV, which could induce HPC
stall. This wear manifests itself early on as higher than typical OFDP
loading. As a result of its investigation, the manufacturer published
service information that specifies procedures for calculating the OFDP
data and replacing the affected No. 3 bearing spring finger housing.
This condition, if not addressed, could result in engine power loss at
a critical phase of flight such as takeoff or climb, loss of thrust
control, reduced controllability of the airplane, and loss of 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-1B-72-00-0369-01A-930A-
D, Issue 001-00, dated August 22, 2022. This service information
specifies procedures for calculating the OFDP data and replacing the
affected No. 3 bearing spring finger housing. This service information
also identifies the serial numbers of the affected No. 3 bearing spring
finger housings installed on LEAP-1B turbofan engines. 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 a calculation of the OFDP data and,
depending on the results of the calculation, replacement of the No. 3
bearing spring finger housing. This proposed AD would also prohibit the
installation of an engine with an affected No. 3 bearing spring finger
housing onto an airplane that already has one engine with an affected
No. 3 bearing spring finger housing installed.
Interim Action
The FAA considers that this proposed AD would be an interim action.
The design approval holder is currently developing a modification that
will address the unsafe condition identified in this proposed AD. Once
this modification is developed, approved, and available, the FAA might
consider additional rulemaking.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 8 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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Calculate OFDP data................... 1 work-hour x $85 per $0 $85 $680
hour = $85.
Replace No. 3 bearing spring finger 17 work-hours x $85 per 64,590 66,035 528,280
housing. hour = $1,445.
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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.
[[Page 73688]]
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-2022-1422; Project
Identifier AD-2022-01208-E.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by January 17, 2023.
(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 with an installed No. 3 bearing spring finger
housing, part number (P/N) 2542M54G01, and serial number (S/N)
identified in Table 1 of CFM Service Bulletin (SB) LEAP-1B-72-00-
0369-01A-930A-D, Issue 001-00, dated August 22, 2022 (CFM LEAP-1B-
72-00-0369-01A-930A-D).
(d) Subject
Joint Aircraft System Component (JASC) Code 7230, Turbine Engine
Compressor Section.
(e) Unsafe Condition
This AD was prompted by a report of multiple aborted takeoffs
and air turn-backs (ATBs) caused by high-pressure compressor (HPC)
stall, which was induced by high levels of non-synchronous vibration
(NSV), and a subsequent investigation by the manufacturer that
revealed wear on the No. 3 bearing spring finger housing. The FAA is
issuing this AD to prevent HPC stall. The unsafe condition, if not
addressed, could result in engine power loss at a critical phase of
flight such as takeoff or climb, loss of thrust control, reduced
controllability of the airplane, and loss of the airplane.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Required Actions
(1) Before the affected No. 3 bearing spring finger housing
accumulates 125 flight cycles (FCs) since new, but not before
accumulating 75 FCs since new, or within 50 FCs after the effective
date of this AD, whichever occurs later, calculate the oil filter
delta pressure (OFDP) data in accordance with the Accomplishment
Instructions, paragraphs 5.A.(1) through 5.A.(2) or 5.B.(1) through
5.B.(2), of CFM LEAP-1B-72-00-0369-01A-930A-D.
(2) Thereafter, at intervals not to exceed 100 FCs from the last
calculation of the OFDP data, and until the affected No. 3 bearing
spring finger housing accumulates 1,000 FCs since new, repeat the
calculation required by paragraph (g)(1) of this AD.
(3) If, during the calculation required by paragraph (g)(1) or
(2) of this AD, the OFDP data exceed the limits specified in the
Accomplishment Instructions, paragraph 5.A.(3) or 5.B.(3), of CFM
LEAP-1B-72-00-0369-01A-930A-D, as applicable, within 25 FCs of
performing the calculation, replace the affected No. 3 bearing
spring finger housing with a part eligible for installation.
(4) During the next engine shop visit after the effective date
of this AD, replace the affected No. 3 bearing spring finger housing
with a part eligible for installation.
(h) Terminating Action
Replacement of the affected No. 3 bearing spring finger housing
with a part eligible for installation, as specified in paragraphs
(g)(3) and (g)(4) of this AD, constitutes terminating action for the
calculations required by paragraphs (g)(1) and (2) of this AD.
(i) Installation Prohibition
After the effective date of this AD, do not install an engine
with an affected No. 3 bearing spring finger housing onto an
airplane that already has one engine with an affected No. 3 bearing
spring finger housing installed.
(j) Definition
For the purpose of this AD, a ``part eligible for installation''
is a No. 3 bearing spring finger housing that is not identified in
Table 1 of CFM LEAP-1B-72-00-0369-01A-930A-D.
(k) 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 (l) of this AD and email it to: <a href="/cdn-cgi/l/email-protection#8ccdc2c9a1cdc8a1cdc1c3cfcceaededa2ebe3fa"><span class="__cf_email__" data-cfemail="55141b107814117814181a16153334347b323a23">[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.
(l) Related Information
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#da97bfb2beb3f496bbb7b4a3b39abcbbbbf4bdb5ac"><span class="__cf_email__" data-cfemail="28654d404c4106644945465141684e4949064f475e">[email protected]</span></a>.
(m) 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 Service Bulletin LEAP-1B-72-00-0369-01A-930A-D, Issue
001-00, dated August 22, 2022.
(ii) [Reserved]
(3) For CFM service information identified in this AD, contact
CFM International Inc., 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#e08196898194898f8ece868c858594939590908f9294a08785ce838f8d"><span class="__cf_email__" data-cfemail="4223342b23362b2d2c6c242e272736313732322d30360225276c212d2f">[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 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#ed8b9fc384839e9d888e99848283ad838c9f8cc38a829b"><span class="__cf_email__" data-cfemail="a8ceda86c1c6dbd8cdcbdcc1c7c6e8c6c9dac986cfc7de">[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 November 9, 2022.
Christina Underwood,
Acting Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2022-26121 Filed 11-30-22; 8:45 am]
BILLING CODE 4910-13-P
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