Rule2022-19946
Airworthiness Directives; CFM International, S.A. Turbofan Engines
Primary source
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Published
September 15, 2022
Effective
October 20, 2022
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is adopting a new airworthiness directive (AD) for certain CFM International, S.A. (CFM) LEAP-1B model turbofan engines. This AD was prompted by multiple commanded in-flight shutdowns (IFSDs) due to inner radial drive shaft (RDS) failure. This AD requires initial and repetitive inspections of the transfer gearbox (TGB) scavenge screens and, depending on the results of the inspections, replacement or rework of the affected inner RDS. As a mandatory terminating action to the initial and repetitive inspections of the TGB scavenge screens, this AD requires replacement or rework of the affected inner RDS. This AD also prohibits the installation of an engine with an affected inner RDS onto an airplane that already has one engine with an affected inner RDS installed. The FAA is issuing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 87 Issue 178 (Thursday, September 15, 2022)</title>
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[Federal Register Volume 87, Number 178 (Thursday, September 15, 2022)]
[Rules and Regulations]
[Pages 56569-56571]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2022-19946]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2022-0515; Project Identifier AD-2022-00287-E;
Amendment 39-22140; AD 2022-17-02]
RIN 2120-AA64
Airworthiness Directives; CFM International, S.A. Turbofan
Engines
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain CFM International, S.A. (CFM) LEAP-1B model turbofan engines.
This AD was prompted by multiple commanded in-flight shutdowns (IFSDs)
due to inner radial drive shaft (RDS) failure. This AD requires initial
and repetitive inspections of the transfer gearbox (TGB) scavenge
screens and, depending on the results of the inspections, replacement
or rework of the affected inner RDS. As a mandatory terminating action
to the initial and repetitive inspections of the TGB scavenge screens,
this AD requires replacement or rework of the affected inner RDS. This
AD also prohibits the installation of an engine with an affected inner
RDS onto an airplane that already has one engine with an affected inner
RDS installed. The FAA is issuing this AD to address the unsafe
condition on these products.
DATES: This AD is effective October 20, 2022.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of October 20,
2022.
ADDRESSES: For service information identified in this final rule,
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#ccaaa0a9a9b8bfb9bcbca3beb88caba9e2afa3a1"><span class="__cf_email__" data-cfemail="20464c454554535550504f52546047450e434f4d">[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. It is
also available at <a href="http://www.regulations.gov">www.regulations.gov</a> by searching for and locating
Docket No. FAA-2022-0515.
Examining the AD Docket
You may examine the AD docket at <a href="http://www.regulations.gov">www.regulations.gov</a> by searching
for and locating Docket No. FAA-2022-0515; 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 final rule, any comments
received, and other information. The address for Docket Operations is
U.S. Department of Transportation, Docket Operations, M-30, West
Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE,
Washington, DC 20590.
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#367b535e525f187a575b584f5f7650575718515940"><span class="__cf_email__" data-cfemail="85c8e0ede1ecabc9e4e8ebfcecc5e3e4e4abe2eaf3">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Background
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to certain CFM 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)
model turbofan engines. The NPRM published in the Federal Register on
June 06, 2022 (87 FR 34221). The NPRM was prompted by reports of
multiple IFSDs on CFM LEAP-1B model turbofan engines beginning in
August 2018. The manufacturer's investigations determined that some of
these IFSD events were the result of inadequate oil flow to the RDS
bearing, which caused the RDS bearing and RDS bearing cage to fail. The
FAA issued AD 2019-12-01, Amendment 39-19656 (84 FR 28202, June 18,
2019), which required initial and repetitive inspections of the TGB
scavenge screens and, depending on the results of the inspection,
possible removal of the engine from service.
After the FAA issued AD 2019-12-01, further investigation by the
manufacturer identified an additional contributing factor to the RDS
bearing failures. The manufacturer revised the service information to
include a repetitive TGB screen inspection until the RDS accumulates
1,500 flight hours (FHs) since new and borescope inspections of the RDS
bearing at 1,500 FHs since new and 6,000 FHs since new. The FAA
superseded AD 2019-12-01 by issuing AD 2020-06-01, Amendment 39-21103
(85 FR 14413, March 12, 2020), which requires revision to the
airworthiness limitations section (ALS) of the applicable engine shop
manual to incorporate the new inspections.
Since the FAA issued AD 2020-06-01, the FAA received further
reports of commanded IFSDs due to inner RDS failure. The manufacturer
initiated an investigation and identified a subpopulation of inner RDS
susceptible to rivet fatigue failure occurring after the inspection
thresholds required by the ALS revision in AD 2020-06-01. In the NPRM,
the FAA proposed to require initial and repetitive inspections of the
TGB1 and TGB2 scavenge screens and, depending on the results of the
inspections, replacement or rework of the affected inner RDS. As a
mandatory terminating action to the initial and repetitive inspections
of the TGB1 and TGB2 scavenge screens, the FAA proposed to require
replacement or rework of the affected inner RDS. The FAA also proposed
prohibiting the installation of an engine with an affected inner RDS
onto an airplane that already has one engine with an affected inner RDS
installed. The FAA is issuing this AD to address the unsafe condition
on these products.
Discussion of Final Airworthiness Directive
Comments
The FAA received comments from three commenters. Commenters
included The Boeing Company, Air Line Pilots Association,
International, and United Airlines. All commenters supported the NPRM
without change.
Conclusion
The FAA reviewed the relevant data, considered the comments
received, and determined that air safety requires adopting the AD as
proposed. Accordingly, the FAA is issuing this AD to address the unsafe
condition on these products. Except for minor editorial changes, this
AD is adopted as proposed in the NPRM.
Related Service Information Under 1 CFR Part 51
The FAA reviewed CFM Service Bulletin (SB) LEAP-1B-72-00-0258-01A-
930A-C, Issue 002, dated September 15, 2020. This service
[[Page 56570]]
information specifies procedures for replacement or rework of the inner
RDS. The FAA also reviewed CFM SB LEAP-1B-72-00-0365-01A-930A-D, Issue
003-00, dated April 26, 2022. This service information identifies the
affected serial numbers of the inner RDS susceptible to rivet fatigue
failure and specifies procedures for performing inspections of TGB1 and
TGB2 scavenge screens. This service information also specifies
procedures for accomplishing applicable corrective actions if metallic
particles are found. 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.
Costs of Compliance
The FAA estimates that this AD affects 34 engines installed on
airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:
Estimated Costs
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Cost per Cost on U.S.
Action Labor cost Parts cost product operators
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Inspect TGB1 and TGB 2 scavenge 1 work-hour x $85 per $0 $85 $2,890
screens. hour = $85.
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For either replacement or rework of the inner RDS, depending on the
option selected by the operator to comply with this AD, the FAA
estimates the following costs:
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Cost per
Action Labor cost Parts cost product
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Replace inner RDS............................. 600 work-hours x $85 per hour = $60,000 $111,000
$51,000.
Rework inner RDS.............................. 600 work-hours x $85 per hour = 54,000 105,000
$51,000.
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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
This AD will not have federalism implications under Executive Order
13132. This AD will 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 that this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Will not affect intrastate aviation in Alaska, and
(3) Will 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 Amendment
Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 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:
2022-17-02 CFM International, S.A.: Amendment 39-22140; Docket No.
FAA-2022-0515; Project Identifier AD-2022-00287-E.
(a) Effective Date
This airworthiness directive (AD) is effective October 20, 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 with an installed inner radial drive shaft
(RDS) with a serial number listed in Additional Information,
paragraph 6.A., Table 1, of CFM Service Bulletin (SB) LEAP-1B-72-00-
0365-01A-930A-D, Issue 003-00, dated April 26, 2022 (CFM SB LEAP-1B-
72-00-0365-01A-930A-D).
(d) Subject
Joint Aircraft System Component (JASC) Code 7260, Turbine Engine
Accessory Drive.
(e) Unsafe Condition
This AD was prompted by multiple commanded in-flight shutdowns
(IFSDs) due to inner RDS failure. The FAA is issuing this AD to
prevent failure of the inner RDS and subsequent IFSDs. The unsafe
condition, if not addressed, could result in failure of one or more
engines, loss of thrust control, and loss of the airplane.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Required Actions
(1) Before exceeding 50 flight hours (FHs) after the effective
date of this AD, and thereafter at intervals not to exceed 50 FHs
from the previous inspection, inspect the transfer gearbox (TGB)
TGB1 and TGB2 scavenge screens in accordance with the Accomplishment
Instructions, paragraph 5.A.(1), of CFM SB LEAP-1B-72-00-0365-01A-
930A-D.
[[Page 56571]]
(2) If, during any inspection required by paragraph (g)(1) of
this AD, any metallic particles are found, before further flight,
perform the actions in the Accomplishment Instructions, paragraphs
5.A.(2) and (3), of CFM SB LEAP-1B-72-00-0365-01A-930A-D. Where
paragraph 5.A.(3)(b) of CFM SB LEAP-1B-72-00-0365-01A-930A-D
specifies to remove the engine, this AD instead requires replacement
or rework of the inner RDS in accordance with the Accomplishment
Instructions, paragraph 5.A., of CFM SB LEAP-1B-72-00-0258-01A-930A-
C Issue 002, dated September 15, 2020 (CFM SB LEAP-1B-72-00-0258-
01A-930A-C).
(h) Mandatory Terminating Action
As a mandatory terminating action to the initial and repetitive
inspections of the TGB1 and TGB2 scavenge screens required by
paragraph (g)(1) of this AD, at the next piece-part exposure after
the effective date of this AD, replace or rework the inner RDS in
accordance with the Accomplishment Instructions, paragraph 5.A., of
CFM SB LEAP-1B-72-00-0258-01A-930A-C.
(i) Installation Prohibition
After the effective date of this AD, do not install an engine
with an affected inner RDS onto an airplane that already has one
engine with an affected inner RDS installed.
(j) Definitions
For the purpose of this AD, ``piece-part exposure'' is when the
fan frame shroud is separated from the fan hub.
(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 to: <a href="/cdn-cgi/l/email-protection#c5848b80e88481e884888a8685a3a4a4eba2aab3"><span class="__cf_email__" data-cfemail="9adbd4dfb7dbdeb7dbd7d5d9dafcfbfbb4fdf5ec">[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#59143c313d3077153834372030193f3838773e362f"><span class="__cf_email__" data-cfemail="d499b1bcb0bdfa98b5b9baadbd94b2b5b5fab3bba2">[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 International, S.A. Service Bulletin LEAP-1B-72-00-0258-
01A-930A-C, Issue 002, dated September 15, 2020.
(ii) CFM International, S.A. Service Bulletin LEAP-1B-72-00-
0365-01A-930A-D, Issue 003-00, dated April 26, 2022.
(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#cdaba1a8a8b9beb8bdbda2bfb98daaa8e3aea2a0"><span class="__cf_email__" data-cfemail="70161c151504030500001f02043017155e131f1d">[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#badcc894d3d4c9cadfd9ced3d5d4fad4dbc8db94ddd5cc"><span class="__cf_email__" data-cfemail="3d5b4f1354534e4d585e495452537d535c4f5c135a524b">[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 August 2, 2022.
Christina Underwood,
Acting Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2022-19946 Filed 9-14-22; 8:45 am]
BILLING CODE 4910-13-P
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