Airworthiness Directives; CFM International, S.A. Turbofan Engines, 8434-8436 [2022-03041]
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8434
Proposed Rules
Federal Register
Vol. 87, No. 31
Tuesday, February 15, 2022
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.
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
Federal Aviation
Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking
(NPRM).
AGENCY:
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:
• Federal eRulemaking Portal: Go to
https://www.regulations.gov. Follow the
instructions for submitting comments.
• Fax: (202) 493–2251.
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SUMMARY:
VerDate Sep<11>2014
18:30 Feb 14, 2022
Jkt 256001
• 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.
• 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: fleetsupport@ge.com.
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
https://www.regulations.gov 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:
Mehdi.Lamnyi@faa.gov.
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
PO 00000
Frm 00001
Fmt 4702
Sfmt 4702
11.35, the FAA will post all comments
received, without change, to https://
www.regulations.gov, 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 meltrelated 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 (lifelimited 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
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15FEP1
Federal Register / Vol. 87, No. 31 / Tuesday, February 15, 2022 / Proposed Rules
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–
8435
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
Action
Labor cost
Revise ALS of Engine Manual and the operator’s existing approved CAMP.
1 work-hour × $85 per hour = $85 .................
Authority for This Rulemaking
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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
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18:30 Feb 14, 2022
Jkt 256001
Cost per
product
Parts cost
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
$0
§ 39.13
$85
Cost on U.S.
operators
$32,130
Amended]
2. The FAA amends § 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.
Accordingly, under the authority
delegated to me by the Administrator,
the FAA proposes to amend 14 CFR part
39 as follows:
(d) Subject
Joint Aircraft System Component (JASC)
Code 7230, Turbine Engine Compressor
Section, and JASC Code 7250, Turbine
Section.
PART 39—AIRWORTHINESS
DIRECTIVES
(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
1. The authority citation for part 39
continues to read as follows:
■
Authority: 49 U.S.C. 106(g), 40113, 44701.
PO 00000
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Fmt 4702
Sfmt 4702
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15FEP1
8436
Federal Register / Vol. 87, No. 31 / Tuesday, February 15, 2022 / Proposed Rules
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.
DEPARTMENT OF TRANSPORTATION
(f) Compliance
RIN 2120–AA64
Comply with this AD within the
compliance times specified, unless already
done.
Airworthiness Directives; The Boeing
Company Airplanes
(g) Required Actions
AGENCY:
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: ANE-AD-AMOC@faa.gov.
(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.
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(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: Mehdi.Lamnyi@faa.gov.
(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: fleetsupport@
ge.com. 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
VerDate Sep<11>2014
18:30 Feb 14, 2022
Jkt 256001
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA–2022–0010; Project
Identifier AD–2021–00850–T]
Federal Aviation
Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking
(NPRM).
The FAA proposes to adopt a
new airworthiness directive (AD) for
certain The Boeing Company Model
787–8, 787–9, and 787–10 airplanes.
This proposed AD was prompted by a
report that during a C-check, corrosion
was found in the vertical fin tension
bolt hole located in the aluminum
crown frames at Section 48. This
proposed AD would require inspecting
certain vertical fin tension bolt holes;
reviewing the bolt sealant application
installation procedure in the existing
maintenance or inspection program, as
applicable; checking maintenance
records to determine the replacement
status of vertical fin tension bolts; and
doing applicable on-condition actions.
The FAA is proposing this AD to
address the unsafe condition on these
products.
SUMMARY:
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:
• Federal eRulemaking Portal: Go to
https://www.regulations.gov. Follow the
instructions for submitting comments.
• Fax: 202–493–2251.
• 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.
• 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 Boeing Commercial
Airplanes, Attention: Contractual & Data
Services (C&DS), 2600 Westminster
Blvd., MC 110–SK57, Seal Beach, CA
90740–5600; telephone 562–797–1717;
internet https://
www.myboeingfleet.com. You may view
this referenced service information at
the FAA, Airworthiness Products
Section, Operational Safety Branch,
DATES:
PO 00000
Frm 00003
Fmt 4702
Sfmt 4702
2200 South 216th St., Des Moines, WA.
For information on the availability of
this material at the FAA, call 206–231–
3195. It is also available at https://
www.regulations.gov by searching for
and locating Docket No. FAA–2022–
0010.
Examining the AD Docket
You may examine the AD docket at
https://www.regulations.gov by
searching for and locating Docket No.
FAA–2022–0010; 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: Greg
Rutar, Aerospace Engineer, Airframe
Section, FAA, Seattle ACO Branch, 2200
South 216th St., Des Moines, WA 98198;
phone and fax: 206–231–3529; email:
greg.rutar@faa.gov.
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–2022–0010; Project Identifier AD–
2021–00850–T’’ 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 https://
www.regulations.gov, 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
E:\FR\FM\15FEP1.SGM
15FEP1
]]>Agencies
[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 [www.gpo.gov]
[FR Doc No: 2022-03041]
========================================================================
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:
Federal eRulemaking Portal: Go to https://www.regulations.gov. Follow the instructions for submitting comments.
Fax: (202) 493-2251.
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.
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:
[email protected]. 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 https://www.regulations.gov 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: [email protected].
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
https://www.regulations.gov, 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
----------------------------------------------------------------------------------------------------------------
Revise ALS of Engine Manual and the 1 work-hour x $85 per $0 $85 $32,130
operator's existing approved CAMP. hour = $85.
----------------------------------------------------------------------------------------------------------------
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: [email protected].
(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:
[email protected].
(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:
[email protected]. 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
