Airworthiness Directives; The Boeing Company Airplanes, 86084-86088 [2023-27099]
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86084
Federal Register / Vol. 88, No. 237 / Tuesday, December 12, 2023 / Proposed Rules
St., Des Moines, WA. For information on the
availability of this material at the FAA, call
206–231–3195.
(5) You may view this material at the
National Archives and Records
Administration (NARA). For information on
the availability of this material at NARA,
visit www.archives.gov/federal-register/cfr/
ibr-locations or email fr.inspection@nara.gov.
Issued on December 1, 2023.
Victor Wicklund,
Deputy Director, Compliance & Airworthiness
Division, Aircraft Certification Service.
[FR Doc. 2023–27101 Filed 12–11–23; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA–2023–2236; Project
Identifier AD–2023–00962–T]
RIN 2120–AA64
Airworthiness Directives; The Boeing
Company Airplanes
Federal Aviation
Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking
(NPRM).
AGENCY:
The FAA proposes to adopt a
new airworthiness directive (AD) for all
The Boeing Company Model 737–600,
–700, –700C, –800, –900, and –900ER
series airplanes. This proposed AD was
prompted by two engine fan blade-out
(FBO) events that resulted in the
separation of engine inlet cowl and fan
cowl parts from the airplane. In one
event, fan cowl parts damaged the
fuselage, which caused loss of
pressurization and subsequent
emergency descent. This proposed AD
would require replacing specified inlet
cowl aft bulkhead fasteners for certain
airplanes; for certain other airplanes,
inspecting the inlet cowl aft bulkhead
fastener and replacing the fasteners if
rivets are found, and, for all airplanes,
replacement of the crushable spacers
used in the attachment of the inlet cowl
to the engine fan case; or as an option,
installing a serviceable inlet cowl. This
proposed AD would also require
revising the existing maintenance or
inspection program, as applicable, to
incorporate new airworthiness
limitations. 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 26,
2024.
ADDRESSES: You may send comments,
using the procedures found in 14 CFR
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SUMMARY:
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11.43 and 11.45, by any of the following
methods:
• Federal eRulemaking Portal: Go to
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.
AD Docket: You may examine the AD
docket at regulations.gov under Docket
No. FAA–2023–2236; 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:
• 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; website
myboeingfleet.com.
• You may view this service
information at the FAA, Airworthiness
Products Section, Operational Safety
Branch, 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
regulations.gov by searching for and
locating Docket No. FAA–2023–2236.
FOR FURTHER INFORMATION CONTACT: Luis
Cortez-Muniz, Aviation Safety Engineer,
FAA, 2200 South 216th St., Des Moines,
WA 98198; telephone 206–231–3958;
email: luis.a.cortez-muniz@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–2023–2236; Project Identifier AD–
2023–00962–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
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following paragraph, and other
information as described in 14 CFR
11.35, the FAA will post all comments
received, without change, to
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 Luis Cortez-Muniz,
Aviation Safety Engineer, FAA, 2200
South 216th St., Des Moines, WA 98198;
telephone 206–231–3958; email:
luis.a.cortez-muniz@faa.gov. Any
commentary that the FAA receives that
is not specifically designated as CBI will
be placed in the public docket for this
rulemaking.
Background
The FAA received two reports of
engine events that resulted in the
separation of engine inlet cowl and fan
cowl parts from the airplane. One event
occurred in August 2016 on a Boeing
Model 737–700 series airplane powered
by a CFM56–7B engine. The left engine
failed due to the FBO but the airplane
landed successfully. The second event
occurred on April 17, 2018, on a Boeing
Model 737–700 series airplane powered
by a CFM56–7B engine. In that event, an
FBO occurrence resulted in the release
of fan cowl parts and the engine cowling
departing the airplane. The fan cowl
parts damaged the fuselage, which
caused loss of pressurization and
subsequent emergency descent.
Although the airplane landed safely,
there was one passenger fatality. In that
event, the suspected cause of the FBO
occurrence was a low-cycle fatigue
crack in the dovetail of fan blade
number 13 of engine number 1. The
broken fan blade hit the engine fan case
at a critical location causing a
significant impulse, displacement, and
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imbalance of the fan rotor effecting the
structural integrity of the engine
cowling.
In response to these events, the FAA
issued two AD actions for the CFM
International S.A. (CFM) Model
CFM56–7B engines. The FAA issued
emergency AD 2018–09–51,
Amendment 39–19287 (83 FR 23794,
May 23, 2018) (AD 2018–09–51), which
requires a one-time ultrasonic
inspection of the concave and convex
sides of the fan blade dovetail. The FAA
also issued AD 2018–26–01,
Amendment 39–19531 (83 FR 66090,
December 26, 2018) (AD 2018–26–01),
which requires initial and repetitive
inspections of the concave and convex
sides of the fan blade dovetail to detect
cracking and replacement of any blades
found. The FAA issued AD 2018–09–51
to address fan blade failure due to
cracking, which could result in an
engine in-flight shutdown (IFSD),
uncontained release of debris, damage
to the engine, damage to the airplane,
and possible airplane decompression.
The FAA issued AD 2018–26–01 to
address failure of the fan blade, which
could result in the engine inlet cowl
disintegrating and debris penetrating the
fuselage, causing a loss of
pressurization, and prompting an
emergency descent.
Since AD 2018–09–51 and AD 2018–
26–01 were issued, the FAA has
determined further rulemaking is
necessary to reduce the probability of
unsecured nacelle components, should
an engine fan blade failure occur. As
evidenced by Exemption No. 19212,
dated July 13, 2022 (Docket No. FAA–
2023–2236), Boeing developed
modifications to the inlet cowl, fan
cowl, and exhaust nozzle that must be
accomplished prior to July 31, 2028.
Boeing petitioned and the FAA later
agreed to amend Exemption No. 19212
to 19212A, which added a requirement
that solutions to address potential
maintenance errors must be
incorporated prior to December 31,
2029. However, to implement these
design changes, the FAA must issue
rulemaking to address the unsafe
condition.
This proposed AD would address
inlet cowls that are not strengthened,
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which could, in the event of an FBO
occurrence, depart the airplane
potentially damaging the airframe
structure, or the inlet cowl could strike
the fuselage and window. The unsafe
condition, if not addressed, could result
in loss of control of the airplane, and
hazard to window-seated passengers aft
of the wing. In addition, the unsafe
condition could result in significantly
increased drag of the airplane, which
during an extended operations (ETOPS)
flight, could lead to fuel starvation and
a forced off-airplane landing.
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 Boeing Special
Attention Requirements Bulletin 737–
71–1938 RB, dated July 27, 2023. This
service information specifies procedures
to accomplish replacement of specified
inlet cowl aft bulkhead fasteners for
certain airplanes; for certain other
airplanes, an inlet cowl aft bulkhead
fastener inspection and fastener
replacement of the inlet cowl aft
bulkhead fasteners if rivets are found,
and, for all airplanes, replacement of the
crushable spacers used in the
attachment of the inlet cowl to the
engine fan case for engine 1 and engine
2; or as an option, installation of a
serviceable inlet cowl with new
crushable spacers.
The service information also requires
revision of the operator’s maintenance
or inspection program, as applicable, by
incorporating certain airworthiness
limitations (AWLs).
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
accomplishing the actions specified in
the service information already
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86085
described, except as discussed under
‘‘Differences Between this Proposed AD
and the Service Information’’ and except
for any differences identified as
exceptions in the regulatory text of this
proposed AD. For information on the
procedures and compliance times, see
this service information at
regulations.gov under Docket No. FAA–
2023–2236.
This proposed AD would require
revisions to certain operator
maintenance documents to include new
airworthiness limitations. Compliance
with these limitations is required by 14
CFR 91.403(c). For airplanes that have
been previously modified, altered, or
repaired in the areas addressed by this
proposed AD, the operator may not be
able to accomplish the actions described
in the revisions. In this situation, to
comply with 14 CFR 91.403(c), the
operator must request approval for an
alternative method of compliance
according to paragraph (j) of this
proposed AD.
Differences Between This Proposed AD
and the Service Information
Boeing Special Attention
Requirements Bulletin 737–71–1938 RB,
dated July 27, 2023, identifies ‘‘System
Airworthiness Limitation NO. 2—Fan
Blade Out Conditions,’’ and ‘‘System
Airworthiness Limitation NO. 3—Fan
Blade Out Conditions’’ as the
airworthiness limitations that must be
incorporated. In addition to those
limitations, the FAA has determined
that ‘‘System Airworthiness Limitation
NO. 4—Engine Nacelle Maintenance
Errors’’ must also be incorporated as
specified in paragraph (h) of this
proposed AD. System Airworthiness
Limitation NO. 4 specifically provides
the limitation that mandates solutions to
maintenance errors that must be
accomplished prior to December 31,
2029, as required by Exemption No.
19212A.
Costs of Compliance
The FAA estimates that this AD, if
adopted as proposed, would affect 1,979
airplanes of U.S. registry. The FAA
estimates the following costs to comply
with this proposed AD:
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Federal Register / Vol. 88, No. 237 / Tuesday, December 12, 2023 / Proposed Rules
ESTIMATED COSTS
Action *
Labor cost
Inspection and fastener replacement (for
Config 1 airplanes)/Fastener replacement
(for Config 2 airplanes).
Crushable spacer replacement .....................
Parts cost
Up to 98 work-hours × $85 per
hour = $8,330.
16 work-hours × $85 per hour =
$1,360.
Cost per product
Cost on U.S.
operators
$922
Up to $9,252 .............
Up to $18,309,708.
14,878
$16,238 .....................
$32,135,002.
* The option to install a serviceable inlet cowl would cost up to $25,490 per product.
The FAA has determined that revising
the existing maintenance or inspection
program takes an average of 90 workhours per operator, although the agency
recognizes that this number may vary
from operator to operator. Since
operators incorporate maintenance or
inspection program changes for their
affected fleet(s), the FAA has
determined that a per-operator estimate
is more accurate than a per-airplane
estimate. Therefore, the agency
estimates the average total cost per
operator to be $7,650 (90 work-hours ×
$85 per work-hour).
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.
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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,
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(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:
1. The authority citation for part 39
continues to read as follows:
■
Authority: 49 U.S.C. 106(g), 40113, 44701.
[Amended]
2. The FAA amends § 39.13 by adding
the following new airworthiness
directive:
■
The Boeing Company: Docket No. FAA–
2023–2236; Project Identifier AD–2023–
00962–T.
(a) Comments Due Date
The FAA must receive comments on this
airworthiness directive (AD) by January 26,
2024.
(b) Affected ADs
None.
(c) Applicability
This AD applies to all The Boeing
Company Model 737–600, –700, –700C,
–800, –900, and –900ER series airplanes,
certificated in any category.
(d) Subject
Air Transport Association (ATA) of
America Code 71, Powerplant.
(e) Unsafe Condition
This AD was prompted by two engine fan
blade-out (FBO) events that resulted in the
separation of engine inlet cowl and fan cowl
parts from the airplane. In one event, fan
cowl parts damaged the fuselage, which
caused loss of pressurization and
subsequential emergency descent. The FAA
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(f) Compliance
Comply with this AD within the
compliance times specified, unless already
done.
(g) Required Actions
PART 39—AIRWORTHINESS
DIRECTIVES
§ 39.13
is issuing this AD to address inlet cowls that
are not strengthened, which, in the event of
an FBO occurrence, could depart the airplane
potentially damaging the airframe structure,
or the inlet cowl could strike the fuselage and
window. The unsafe condition, if not
addressed, could result in loss of control of
the airplane and hazard to window-seated
passengers aft of the wing. In addition, the
unsafe condition could result in significantly
increased drag of the airplane, which during
an extended operations (ETOPS) flight, could
lead to fuel starvation and a forced offairplane landing.
Except as specified by paragraph (h) of this
AD: At the applicable times specified in the
‘‘Compliance’’ paragraph of Boeing Special
Attention Requirements Bulletin 737–71–
1938 RB, dated July 27, 2023, do all
applicable actions identified in, and in
accordance with, the Accomplishment
Instructions of Boeing Special Attention
Requirements Bulletin 737–71–1938 RB,
dated July 27, 2023.
Note 1 to paragraph (g): Guidance for
accomplishing the actions required by this
AD can be found in Boeing Special Attention
Service Bulletin 737–71–1938, dated July 27,
2023, which is referred to in Boeing Special
Attention Requirements Bulletin 737–71–
1938 RB, dated July 27, 2023.
(h) Exceptions to Service Information
Specifications
Where Tables 1 through 4 of Boeing
Special Attention Requirements Bulletin
737–71–1938 RB, dated July 27, 2023, specify
incorporating 737–600/700/700C/800/900/
900ER Airworthiness Limitations (AWLs)
document D626A001–9–01 ‘‘System
Airworthiness Limitation NO. 2—Fan Blade
Out Conditions’’ and ‘‘System Airworthiness
Limitation NO. 3—Fan Blade Out
Conditions’’ into the operators maintenance
program, this AD requires revising the
existing maintenance or inspection program,
as applicable, by incorporating the
information specified in Figure 1 to the
introductory text of paragraph (h) of this AD
into the airworthiness limitations within 90
days after the effective date of this AD, or
within the applicable time specified in
paragraph (h)(1) or (2) of this AD, whichever
occurs first.
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Federal Register / Vol. 88, No. 237 / Tuesday, December 12, 2023 / Proposed Rules
86087
Figure 1 to the Introductory Text of
Paragraph (h)—System Airworthiness
Limitations
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(i) No Alternative Actions
After the existing maintenance or
inspection program has been revised as
required by paragraph (h) of this AD, no
alternative actions may be used unless the
actions are approved as an alternative
method of compliance (AMOC) in
accordance with the procedures specified in
paragraph (j) of this AD.
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(j) Alternative Methods of Compliance
(AMOCs)
(1) The Manager, AIR–520, Continued
Operational Safety 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 responsible Flight Standards 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 (k) of this AD.
Information may be emailed to: 9-ANMSeattle-ACO-AMOC-Requests@faa.gov.
(2) Before using any approved AMOC,
notify your appropriate principal inspector,
or lacking a principal inspector, the manager
of the responsible Flight Standards Office.
(3) An AMOC that provides an acceptable
level of safety may be used for any repair,
modification, or alteration required by this
AD if it is approved by The Boeing Company
Organization Designation Authorization
(ODA) that has been authorized by the
Manager, AIR–520, Continued Operational
Safety Branch, FAA, to make those findings.
To be approved, the repair method,
modification deviation, or alteration
deviation must meet the certification basis of
the airplane, and the approval must
specifically refer to this AD.
(k) Related Information
For more information about this AD,
contact Luis Cortez-Muniz, Aviation Safety
PO 00000
Frm 00022
Fmt 4702
Sfmt 4702
Engineer, FAA, 2200 South 216th St., Des
Moines, WA 98198; telephone 206–231–
3958; email: luis.a.cortez-muniz@faa.gov.
(l) 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) Boeing Special Attention Requirements
Bulletin 737–71–1938 RB, dated July 27,
2023.
(ii) [Reserved]
(3) For service information identified in
this AD, 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; website
myboeingfleet.com.
(4) You may view this service information
at the FAA, Airworthiness Products Section,
Operational Safety Branch, 2200 South 216th
St., Des Moines, WA. For information on the
availability of this material at the FAA, call
206–231–3195.
(5) You may view this material at the
National Archives and Records
Administration (NARA). For information on
the availability of this material at NARA,
visit www.archives.gov/federal-register/cfr/
ibr-locations or email fr.inspection@nara.gov.
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EP12DE23.001
(1) For Group 1 Configuration 1 airplanes
identified in Boeing Special Attention
Requirements Bulletin 737–71–1938 RB,
dated July 27, 2023: Before further flight after
accomplishing the (Option 1) or (Option 2)
actions in Boeing Special Attention
Requirements Bulletin 737–71–1938 RB,
dated July 27, 2023.
(2) For Group 1 Configuration 2 airplanes
identified in Boeing Special Attention
Requirements Bulletin 737–71–1938 RB,
dated July 27, 2023: Before further flight after
accomplishing any of the actions specified in
paragraphs (h)(2)(i) and (ii) of this AD.
(i) The Condition 1 or Condition 2 actions
specified in Boeing Special Attention
Requirements Bulletin 737–71–1938 RB,
dated July 27, 2023.
(ii) The (Option 2) actions specified in
Boeing Special Attention Requirements
Bulletin 737–71–1938 RB, dated July 27,
2023.
86088
Federal Register / Vol. 88, No. 237 / Tuesday, December 12, 2023 / Proposed Rules
Issued on December 4, 2023.
Victor Wicklund,
Deputy Director, Compliance & Airworthiness
Division, Aircraft Certification Service.
[FR Doc. 2023–27099 Filed 12–11–23; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA–2023–2237; Project
Identifier AD–2023–01057–E]
RIN 2120–AA64
Airworthiness Directives; International
Aero Engines, LLC Engines
Federal Aviation
Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking
(NPRM).
AGENCY:
The FAA proposes to
supersede Airworthiness Directive (AD)
2022–19–15, which applies to certain
International Aero Engines, LLC (IAE
LLC) Model PW1100G series engines;
and AD 2023–16–07, which applies to
certain IAE LLC Model PW1100G series
engines and PW1400G series engines.
AD 2022–19–15 requires an angled
ultrasonic inspection (AUSI) of the
high-pressure turbine (HPT) 1st-stage
disk and HPT 2nd-stage disk, and
replacement if necessary. AD 2023–16–
07 requires an AUSI of the HPT 1ststage hub (also known as the HPT 1ststage disk) and HPT 2nd-stage hub (also
known as the HPT 2nd-stage disk) for
cracks, and replacement if necessary,
which is terminating action for AD
2022–19–15. Since the FAA issued
these two ADs, an investigation
determined an increased risk of powder
metal anomalies for all powder metal
parts in certain powder metal
production campaigns, which are
susceptible to failure significantly
earlier than previously determined. This
proposed AD would retain the AUSI
requirement for certain HPT 1st-stage
and HPT 2nd-stage hubs from AD 2023–
16–07. This proposed AD would also
require performing an AUSI of the HPT
1st-stage hub, HPT 2nd-stage hub, highpressure compressor (HPC) 7th-stage
integrally bladed rotor (IBR–7), and HPC
8th-stage integrally bladed rotor (IBR–8)
for cracks and replacement if necessary.
This proposed AD would also require
accelerated replacement of the HPC
IBR–7, HPC IBR–8, HPC rear hub, HPT
1st-stage hub, HPT 1st-stage air seal,
HPT 1st-stage blade retaining plate, HPT
2nd-stage hub, HPT 2nd-stage blade
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SUMMARY:
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retaining plate, and HPT 2nd-stage rear
seal. 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 11,
2024.
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
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.
AD Docket: You may examine the AD
docket at regulations.gov under Docket
No. FAA–2023–2237; 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:
• For Pratt and Whitney (PW) service
information identified in this NPRM,
contact International Aero Engines, LLC,
400 Main Street, East Hartford, CT
06118; phone: (860) 565–0140; email:
help24@pw.utc.com; website:
connect.prattwhitney.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.
FOR FURTHER INFORMATION CONTACT:
Carol Nguyen, Aviation Safety Engineer,
FAA, 2200 South 216th Street, Des
Moines, WA 98198; phone: (781) 238–
7655; email: carol.nguyen@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–2023–2237; Project Identifier AD–
2023–01057–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
PO 00000
Frm 00023
Fmt 4702
Sfmt 4702
supporting data. The FAA will consider
all comments received by the closing
date and may amend the proposal
because of those comments.
The FAA has been informed that PW
has done some outreach with affected
operators regarding the proposed
corrective actions for this unsafe
condition. As a result, affected operators
are already aware of the proposed
corrective actions and, in some cases,
have already begun planning for
replacement of the affected parts.
Therefore, the FAA has determined that
a 30-day comment period is appropriate
given the particular circumstances
related to the proposed correction of
this unsafe condition.
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
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 Carol Nguyen,
Aviation Safety Engineer, FAA, 2200
South 216th Street, Des Moines, WA
98198. 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 issued AD 2022–19–15,
Amendment 39–22184 (87 FR 59660,
October 3, 2022; corrected October 24,
2022 (87 FR 64156)) (AD 2022–19–15),
for certain IAE LLC Model PW1122G–
JM, PW1124G1–JM, PW1124G–JM,
PW1127G1–JM, PW1127GA–JM,
PW1127G–JM, PW1129G–JM,
PW1130G–JM, PW1133GA–JM, and
E:\FR\FM\12DEP1.SGM
12DEP1
Agencies
[Federal Register Volume 88, Number 237 (Tuesday, December 12, 2023)]
[Proposed Rules]
[Pages 86084-86088]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2023-27099]
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2023-2236; Project Identifier AD-2023-00962-T]
RIN 2120-AA64
Airworthiness Directives; The Boeing Company Airplanes
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 The Boeing Company Model 737-600, -700, -700C, -800, -900, and
-900ER series airplanes. This proposed AD was prompted by two engine
fan blade-out (FBO) events that resulted in the separation of engine
inlet cowl and fan cowl parts from the airplane. In one event, fan cowl
parts damaged the fuselage, which caused loss of pressurization and
subsequent emergency descent. This proposed AD would require replacing
specified inlet cowl aft bulkhead fasteners for certain airplanes; for
certain other airplanes, inspecting the inlet cowl aft bulkhead
fastener and replacing the fasteners if rivets are found, and, for all
airplanes, replacement of the crushable spacers used in the attachment
of the inlet cowl to the engine fan case; or as an option, installing a
serviceable inlet cowl. This proposed AD would also require revising
the existing maintenance or inspection program, as applicable, to
incorporate new airworthiness limitations. 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 26,
2024.
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 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.
AD Docket: You may examine the AD docket at regulations.gov under
Docket No. FAA-2023-2236; 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:
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; website myboeingfleet.com.
You may view this service information at the FAA,
Airworthiness Products Section, Operational Safety Branch, 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
regulations.gov by searching for and locating Docket No. FAA-2023-2236.
FOR FURTHER INFORMATION CONTACT: Luis Cortez-Muniz, Aviation Safety
Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; telephone
206-231-3958; 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-2023-2236; Project Identifier
AD-2023-00962-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
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 Luis
Cortez-Muniz, Aviation Safety Engineer, FAA, 2200 South 216th St., Des
Moines, WA 98198; telephone 206-231-3958; email: [email protected]. Any commentary that the FAA receives that is not
specifically designated as CBI will be placed in the public docket for
this rulemaking.
Background
The FAA received two reports of engine events that resulted in the
separation of engine inlet cowl and fan cowl parts from the airplane.
One event occurred in August 2016 on a Boeing Model 737-700 series
airplane powered by a CFM56-7B engine. The left engine failed due to
the FBO but the airplane landed successfully. The second event occurred
on April 17, 2018, on a Boeing Model 737-700 series airplane powered by
a CFM56-7B engine. In that event, an FBO occurrence resulted in the
release of fan cowl parts and the engine cowling departing the
airplane. The fan cowl parts damaged the fuselage, which caused loss of
pressurization and subsequent emergency descent. Although the airplane
landed safely, there was one passenger fatality. In that event, the
suspected cause of the FBO occurrence was a low-cycle fatigue crack in
the dovetail of fan blade number 13 of engine number 1. The broken fan
blade hit the engine fan case at a critical location causing a
significant impulse, displacement, and
[[Page 86085]]
imbalance of the fan rotor effecting the structural integrity of the
engine cowling.
In response to these events, the FAA issued two AD actions for the
CFM International S.A. (CFM) Model CFM56-7B engines. The FAA issued
emergency AD 2018-09-51, Amendment 39-19287 (83 FR 23794, May 23, 2018)
(AD 2018-09-51), which requires a one-time ultrasonic inspection of the
concave and convex sides of the fan blade dovetail. The FAA also issued
AD 2018-26-01, Amendment 39-19531 (83 FR 66090, December 26, 2018) (AD
2018-26-01), which requires initial and repetitive inspections of the
concave and convex sides of the fan blade dovetail to detect cracking
and replacement of any blades found. The FAA issued AD 2018-09-51 to
address fan blade failure due to cracking, which could result in an
engine in-flight shutdown (IFSD), uncontained release of debris, damage
to the engine, damage to the airplane, and possible airplane
decompression. The FAA issued AD 2018-26-01 to address failure of the
fan blade, which could result in the engine inlet cowl disintegrating
and debris penetrating the fuselage, causing a loss of pressurization,
and prompting an emergency descent.
Since AD 2018-09-51 and AD 2018-26-01 were issued, the FAA has
determined further rulemaking is necessary to reduce the probability of
unsecured nacelle components, should an engine fan blade failure occur.
As evidenced by Exemption No. 19212, dated July 13, 2022 (Docket No.
FAA-2023-2236), Boeing developed modifications to the inlet cowl, fan
cowl, and exhaust nozzle that must be accomplished prior to July 31,
2028. Boeing petitioned and the FAA later agreed to amend Exemption No.
19212 to 19212A, which added a requirement that solutions to address
potential maintenance errors must be incorporated prior to December 31,
2029. However, to implement these design changes, the FAA must issue
rulemaking to address the unsafe condition.
This proposed AD would address inlet cowls that are not
strengthened, which could, in the event of an FBO occurrence, depart
the airplane potentially damaging the airframe structure, or the inlet
cowl could strike the fuselage and window. The unsafe condition, if not
addressed, could result in loss of control of the airplane, and hazard
to window-seated passengers aft of the wing. In addition, the unsafe
condition could result in significantly increased drag of the airplane,
which during an extended operations (ETOPS) flight, could lead to fuel
starvation and a forced off-airplane landing.
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 Boeing Special Attention Requirements Bulletin
737-71-1938 RB, dated July 27, 2023. This service information specifies
procedures to accomplish replacement of specified inlet cowl aft
bulkhead fasteners for certain airplanes; for certain other airplanes,
an inlet cowl aft bulkhead fastener inspection and fastener replacement
of the inlet cowl aft bulkhead fasteners if rivets are found, and, for
all airplanes, replacement of the crushable spacers used in the
attachment of the inlet cowl to the engine fan case for engine 1 and
engine 2; or as an option, installation of a serviceable inlet cowl
with new crushable spacers.
The service information also requires revision of the operator's
maintenance or inspection program, as applicable, by incorporating
certain airworthiness limitations (AWLs).
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 accomplishing the actions specified
in the service information already described, except as discussed under
``Differences Between this Proposed AD and the Service Information''
and except for any differences identified as exceptions in the
regulatory text of this proposed AD. For information on the procedures
and compliance times, see this service information at regulations.gov
under Docket No. FAA-2023-2236.
This proposed AD would require revisions to certain operator
maintenance documents to include new airworthiness limitations.
Compliance with these limitations is required by 14 CFR 91.403(c). For
airplanes that have been previously modified, altered, or repaired in
the areas addressed by this proposed AD, the operator may not be able
to accomplish the actions described in the revisions. In this
situation, to comply with 14 CFR 91.403(c), the operator must request
approval for an alternative method of compliance according to paragraph
(j) of this proposed AD.
Differences Between This Proposed AD and the Service Information
Boeing Special Attention Requirements Bulletin 737-71-1938 RB,
dated July 27, 2023, identifies ``System Airworthiness Limitation NO.
2--Fan Blade Out Conditions,'' and ``System Airworthiness Limitation
NO. 3--Fan Blade Out Conditions'' as the airworthiness limitations that
must be incorporated. In addition to those limitations, the FAA has
determined that ``System Airworthiness Limitation NO. 4--Engine Nacelle
Maintenance Errors'' must also be incorporated as specified in
paragraph (h) of this proposed AD. System Airworthiness Limitation NO.
4 specifically provides the limitation that mandates solutions to
maintenance errors that must be accomplished prior to December 31,
2029, as required by Exemption No. 19212A.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 1,979 airplanes of U.S. registry. The FAA estimates the
following costs to comply with this proposed AD:
[[Page 86086]]
Estimated Costs
----------------------------------------------------------------------------------------------------------------
Cost on U.S.
Action * Labor cost Parts cost Cost per product operators
----------------------------------------------------------------------------------------------------------------
Inspection and fastener Up to 98 work-hours $922 Up to $9,252....... Up to $18,309,708.
replacement (for Config 1 x $85 per hour =
airplanes)/Fastener replacement $8,330.
(for Config 2 airplanes).
Crushable spacer replacement..... 16 work-hours x $85 14,878 $16,238............ $32,135,002.
per hour = $1,360.
----------------------------------------------------------------------------------------------------------------
* The option to install a serviceable inlet cowl would cost up to $25,490 per product.
The FAA has determined that revising the existing maintenance or
inspection program takes an average of 90 work-hours per operator,
although the agency recognizes that this number may vary from operator
to operator. Since operators incorporate maintenance or inspection
program changes for their affected fleet(s), the FAA has determined
that a per-operator estimate is more accurate than a per-airplane
estimate. Therefore, the agency estimates the average total cost per
operator to be $7,650 (90 work-hours x $85 per work-hour).
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:
The Boeing Company: Docket No. FAA-2023-2236; Project Identifier AD-
2023-00962-T.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by January 26, 2024.
(b) Affected ADs
None.
(c) Applicability
This AD applies to all The Boeing Company Model 737-600, -700, -
700C, -800, -900, and -900ER series airplanes, certificated in any
category.
(d) Subject
Air Transport Association (ATA) of America Code 71, Powerplant.
(e) Unsafe Condition
This AD was prompted by two engine fan blade-out (FBO) events
that resulted in the separation of engine inlet cowl and fan cowl
parts from the airplane. In one event, fan cowl parts damaged the
fuselage, which caused loss of pressurization and subsequential
emergency descent. The FAA is issuing this AD to address inlet cowls
that are not strengthened, which, in the event of an FBO occurrence,
could depart the airplane potentially damaging the airframe
structure, or the inlet cowl could strike the fuselage and window.
The unsafe condition, if not addressed, could result in loss of
control of the airplane and hazard to window-seated passengers aft
of the wing. In addition, the unsafe condition could result in
significantly increased drag of the airplane, which during an
extended operations (ETOPS) flight, could lead to fuel starvation
and a forced off-airplane landing.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Required Actions
Except as specified by paragraph (h) of this AD: At the
applicable times specified in the ``Compliance'' paragraph of Boeing
Special Attention Requirements Bulletin 737-71-1938 RB, dated July
27, 2023, do all applicable actions identified in, and in accordance
with, the Accomplishment Instructions of Boeing Special Attention
Requirements Bulletin 737-71-1938 RB, dated July 27, 2023.
Note 1 to paragraph (g): Guidance for accomplishing the actions
required by this AD can be found in Boeing Special Attention Service
Bulletin 737-71-1938, dated July 27, 2023, which is referred to in
Boeing Special Attention Requirements Bulletin 737-71-1938 RB, dated
July 27, 2023.
(h) Exceptions to Service Information Specifications
Where Tables 1 through 4 of Boeing Special Attention
Requirements Bulletin 737-71-1938 RB, dated July 27, 2023, specify
incorporating 737-600/700/700C/800/900/900ER Airworthiness
Limitations (AWLs) document D626A001-9-01 ``System Airworthiness
Limitation NO. 2--Fan Blade Out Conditions'' and ``System
Airworthiness Limitation NO. 3--Fan Blade Out Conditions'' into the
operators maintenance program, this AD requires revising the
existing maintenance or inspection program, as applicable, by
incorporating the information specified in Figure 1 to the
introductory text of paragraph (h) of this AD into the airworthiness
limitations within 90 days after the effective date of this AD, or
within the applicable time specified in paragraph (h)(1) or (2) of
this AD, whichever occurs first.
[[Page 86087]]
Figure 1 to the Introductory Text of Paragraph (h)--System
Airworthiness Limitations
[GRAPHIC] [TIFF OMITTED] TP12DE23.001
(1) For Group 1 Configuration 1 airplanes identified in Boeing
Special Attention Requirements Bulletin 737-71-1938 RB, dated July
27, 2023: Before further flight after accomplishing the (Option 1)
or (Option 2) actions in Boeing Special Attention Requirements
Bulletin 737-71-1938 RB, dated July 27, 2023.
(2) For Group 1 Configuration 2 airplanes identified in Boeing
Special Attention Requirements Bulletin 737-71-1938 RB, dated July
27, 2023: Before further flight after accomplishing any of the
actions specified in paragraphs (h)(2)(i) and (ii) of this AD.
(i) The Condition 1 or Condition 2 actions specified in Boeing
Special Attention Requirements Bulletin 737-71-1938 RB, dated July
27, 2023.
(ii) The (Option 2) actions specified in Boeing Special
Attention Requirements Bulletin 737-71-1938 RB, dated July 27, 2023.
(i) No Alternative Actions
After the existing maintenance or inspection program has been
revised as required by paragraph (h) of this AD, no alternative
actions may be used unless the actions are approved as an
alternative method of compliance (AMOC) in accordance with the
procedures specified in paragraph (j) of this AD.
(j) Alternative Methods of Compliance (AMOCs)
(1) The Manager, AIR-520, Continued Operational Safety 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
responsible Flight Standards 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 (k)
of this AD. Information may be emailed to: [email protected].
(2) Before using any approved AMOC, notify your appropriate
principal inspector, or lacking a principal inspector, the manager
of the responsible Flight Standards Office.
(3) An AMOC that provides an acceptable level of safety may be
used for any repair, modification, or alteration required by this AD
if it is approved by The Boeing Company Organization Designation
Authorization (ODA) that has been authorized by the Manager, AIR-
520, Continued Operational Safety Branch, FAA, to make those
findings. To be approved, the repair method, modification deviation,
or alteration deviation must meet the certification basis of the
airplane, and the approval must specifically refer to this AD.
(k) Related Information
For more information about this AD, contact Luis Cortez-Muniz,
Aviation Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA
98198; telephone 206-231-3958; email: [email protected].
(l) 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) Boeing Special Attention Requirements Bulletin 737-71-1938
RB, dated July 27, 2023.
(ii) [Reserved]
(3) For service information identified in this AD, 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; website myboeingfleet.com.
(4) You may view this service information at the FAA,
Airworthiness Products Section, Operational Safety Branch, 2200
South 216th St., Des Moines, WA. For information on the availability
of this material at the FAA, call 206-231-3195.
(5) You may view this material at the National Archives and
Records Administration (NARA). For information on the availability
of this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations or email [email protected].
[[Page 86088]]
Issued on December 4, 2023.
Victor Wicklund,
Deputy Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2023-27099 Filed 12-11-23; 8:45 am]
BILLING CODE 4910-13-P