Proposed Rule2022-11897
Airworthiness Directives; CFM International, S.A. Turbofan Engines
Primary source
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Published
June 6, 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 model turbofan engines. This proposed AD was prompted by multiple commanded in-flight shutdowns (IFSDs) due to inner radial drive shaft (RDS) failure. This proposed AD would require 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 proposed AD would require replacement or rework of the affected inner RDS. This proposed AD would also prohibit 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 proposing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 87 Issue 108 (Monday, June 6, 2022)</title>
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[Federal Register Volume 87, Number 108 (Monday, June 6, 2022)]
[Proposed Rules]
[Pages 34221-34223]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2022-11897]
[[Page 34221]]
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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]
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 model turbofan
engines. This proposed AD was prompted by multiple commanded in-flight
shutdowns (IFSDs) due to inner radial drive shaft (RDS) failure. This
proposed AD would require 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 proposed AD would require
replacement or rework of the affected inner RDS. This proposed AD would
also prohibit 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 proposing this AD to address the unsafe condition
on these products.
DATES: The FAA must receive comments on this proposed AD by July 21,
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#fe98929b9b8a8d8b8e8e918c8abe999bd09d9193"><span class="__cf_email__" data-cfemail="94f2f8f1f1e0e7e1e4e4fbe6e0d4f3f1baf7fbf9">[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-2022-0515; 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 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#7538101d111c5b3914181b0c1c351314145b121a03"><span class="__cf_email__" data-cfemail="68250d000c0146240905061101280e0909460f071e">[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-2022-0515; Project Identifier
AD-2022-00287-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 received reports of multiple IFSDs on 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 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. This
condition, if not addressed, could result in failure of one or more
engines, loss of thrust control, and loss of the airplane.
[[Page 34222]]
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 (SB) LEAP-1B-72-00-0365-01A-
930A-D, Issue 003-00, dated April 26, 2022 (CFM LEAP-1B-72-00-0365-01A-
930A-D). This SB 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 SB also
specifies procedures for accomplishing applicable corrective actions if
metallic particles are found. The FAA also reviewed CFM SB LEAP-1B-72-
00-0258-01A-930A-C, Issue 002, dated September 15, 2020. This SB
specifies procedures for replacement or rework of the inner RDS. 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 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, this proposed AD would require
replacement or rework of the affected inner RDS. This proposed AD would
also prohibit the installation of an engine with an affected inner RDS
onto an airplane that already has one engine with an affected inner RDS
installed.
Differences Between This Proposed AD and the Service Information
The Accomplishment Instructions, paragraph 5.A.(3), of CFM LEAP-1B-
72-00-0365-01A-930A-D specifies removing the engine if certain
conditions exist, whereas this proposed AD would require replacement or
rework of the affected inner RDS if certain conditions exist.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 34 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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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
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-2022-0515; Project
Identifier AD-2022-00287-E.
[[Page 34223]]
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by July 21, 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 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 LEAP-1B-72-00-0365-01A-930A-
D.
(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 LEAP-1B-72-00-0365-01A-930A-D. Where
paragraph 5.A.(3)(b) of CFM 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)(1) of this AD and email to: <a href="/cdn-cgi/l/email-protection#8ecfc0cba3cfcaa3cfc3c1cdcee8efefa0e9e1f8"><span class="__cf_email__" data-cfemail="e1a0afa4cca0a5cca0acaea2a1878080cf868e97">[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
(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#aee3cbc6cac780e2cfc3c0d7c7eec8cfcf80c9c1d8"><span class="__cf_email__" data-cfemail="7e331b161a1750321f131007173e181f1f50191108">[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#680e040d0d1c1b1d1818071a1c280f0d460b0705"><span class="__cf_email__" data-cfemail="accac0c9c9d8dfd9dcdcc3ded8eccbc982cfc3c1">[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 May 5, 2022.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification
Service.
[FR Doc. 2022-11897 Filed 6-3-22; 8:45 am]
BILLING CODE 4910-13-P
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