Rule2024-01969
Airworthiness Directives; The Boeing Company Airplanes
Primary source
Metadata and text below are from the Federal Register, a public-domain U.S. government work. Always verify the official published version before relying on it for any legal matter.
Published
February 1, 2024
Effective
March 7, 2024
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA is superseding Airworthiness Directive (AD) 2020-26- 08, which applied to The Boeing Company Model 787-8, 787-9, and 787-10 airplanes powered by Rolls-Royce Trent 1000 engines. AD 2020-26-08 required repetitive inspections of the inner fixed structure (IFS) forward upper fire seal and thermal insulation blankets in the forward upper area of the thrust reverser (TR) for damage and applicable on- condition actions. Since the FAA issued AD 2020-26-08, the FAA determined that a new upper splitter fairing assembly is needed to prevent damage to the fire seal and thermal insulation blanket. This AD continues to require the actions specified in AD 2020-26-08 and requires determining if an affected part number of the upper splitter fairing assembly is installed on the engine, replacing an affected upper splitter fairing assembly part number with a new upper splitter fairing assembly part number, inspecting the IFS forward upper fire seal and thermal insulation blanket for any damage, and applicable on- condition actions. This AD also prohibits the installation of affected parts. The FAA is issuing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 89 Issue 22 (Thursday, February 1, 2024)</title>
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<body><pre>
[Federal Register Volume 89, Number 22 (Thursday, February 1, 2024)]
[Rules and Regulations]
[Pages 6425-6428]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2024-01969]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2023-1037; Project Identifier AD-2023-00511-T;
Amendment 39-22655; AD 2024-01-04]
RIN 2120-AA64
Airworthiness Directives; The Boeing Company Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2020-26-
08, which applied to The Boeing Company Model 787-8, 787-9, and 787-10
airplanes powered by Rolls-Royce Trent 1000 engines. AD 2020-26-08
required repetitive inspections of the inner fixed structure (IFS)
forward upper fire seal and thermal insulation blankets in the forward
upper area of the thrust reverser (TR) for damage and applicable on-
condition actions. Since the FAA issued AD 2020-26-08, the FAA
determined that a new upper splitter fairing assembly is needed to
prevent damage to the fire seal and thermal insulation blanket. This AD
continues to require the actions specified in AD 2020-26-08 and
requires determining if an affected part number of the upper splitter
fairing assembly is installed on the engine, replacing an affected
upper splitter fairing assembly part number with a new upper splitter
fairing assembly part number, inspecting the IFS forward upper fire
seal and thermal insulation blanket for any damage, and applicable on-
condition actions. This AD also prohibits the installation of affected
parts. The FAA is issuing this AD to address the unsafe condition on
these products.
DATES: This AD is effective March 7, 2024.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of March 7,
2024.
The Director of the Federal Register approved the incorporation by
reference of a certain other publication listed in this AD as of
January 27, 2021 (85 FR 83755, December 23, 2020).
ADDRESSES:
AD Docket: You may examine the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2023-1037; or in person at Docket Operations between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD
docket contains this final rule, any comments received, and other
information. The address for Docket Operations is U.S. Department of
Transportation, Docket Operations, M-30, West Building Ground Floor,
Room W12-140, 1200 New Jersey Avenue SE, Washington, DC 20590.
Material Incorporated by Reference:
<bullet> For service information identified in this final rule,
contact Boeing Commercial Airplanes, Attention: Contractual & Data
Services (C&DS), 2600 Westminster Boulevard, MC 110-SK57, Seal Beach,
CA 90740-5600; telephone 562-797-1717; website <a href="http://myboeingfleet.com">myboeingfleet.com</a>.
<bullet> You may view this service information at the FAA,
Airworthiness Products Section, Operational Safety Branch, 2200 South
216th Street, Des Moines, WA. For information on the availability of
this material at the FAA, call 206-231-3195. It is also available at
<a href="http://regulations.gov">regulations.gov</a> under Docket No. FAA-2023-1037.
FOR FURTHER INFORMATION CONTACT: Tak Kobayashi, Aviation Safety
Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; telephone
206-231-3553; email <a href="/cdn-cgi/l/email-protection#13677278727b7a60723d787c71726a72607b7a537572723d747c65"><span class="__cf_email__" data-cfemail="c8bca9a3a9a0a1bba9e6a3a7aaa9b1a9bba0a188aea9a9e6afa7be">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Background
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 to supersede AD 2020-26-08, Amendment 39-21363 (85 FR
83755, December 23, 2020) (AD 2020-26-08). AD 2020-26-08 applied to The
Boeing Company Model 787-8, 787-9, and 787-10 airplanes powered by
Rolls-Royce Trent 1000 engines. AD 2020-26-08 required repetitive
inspections of the IFS forward upper fire seal and thermal insulation
blankets in the forward upper area of the TR for damage and applicable
on-condition actions.
The NPRM published in the Federal Register on May 25, 2023 (88 FR
33851). The NPRM was prompted by a
[[Page 6426]]
determination that a new upper splitter fairing assembly part number
(P/N) KH99185 should be required to prevent damage to the fire seal and
thermal insulation blanket. In the NPRM, the FAA proposed to continue
to require the actions specified in AD 2020-26-08 and require
determining if upper splitter fairing assembly P/N KH60375 is installed
on the engine, replacing upper splitter fairing assembly P/N KH60375
with a new upper splitter fairing assembly part number, inspecting the
IFS forward upper fire seal and thermal insulation blanket for any
damage, and applicable on-condition actions.
The FAA issued a supplemental NPRM (SNPRM) to amend 14 CFR part 39
to supersede AD 2020-26-08. The SNPRM published in the Federal Register
on October 31, 2023 (88 FR 74372). The SNPRM was prompted by the FAA
identifying an additional affected upper splitter fairing assembly, P/N
KH11560, that must be replaced to address the unsafe condition. In the
SNPRM, the FAA revised the NPRM by proposing replacement of the
additional upper splitter fairing assembly. The FAA is issuing this AD
to address the damage to the IFS forward upper fire seal and the
thermal insulation blankets of the TR due to airflow through structural
gapping that could occur at the interface between the leading edge of
the IFS and the engine splitter structure during flight. Failure of the
IFS forward upper fire seal could cause the loss of seal pressurization
and degrade the ability to detect and extinguish an engine fire,
resulting in an uncontrolled fire. Damage to the TR insulation blanket
could result in thermal damage to the TR inner wall, the subsequent
release of engine exhaust components, and consequent damage to critical
areas of the airplane. Furthermore, damage to the TR inner wall and IFS
forward upper fire seal could compromise the integrity of the firewall
and its ability to contain an engine fire, resulting in an uncontrolled
fire.
Discussion of Final Airworthiness Directive
Comments
The FAA received comments from The Air Line Pilots Association,
International and The Boeing Company, who both supported the SNPRM
without change.
Conclusion
The FAA reviewed the relevant data, considered the comments
received, and determined that air safety requires adopting this AD as
proposed. Accordingly, the FAA is issuing this AD to address the unsafe
condition on these products. This AD is adopted as proposed in the
SNPRM.
Related Service Information Under 1 CFR Part 51
The FAA reviewed Boeing Alert Requirements Bulletin B787-81205-
SB720007-00 RB, Issue 001, dated December 12, 2022. This service
information specifies replacing the upper splitter fairing assembly
with a new upper splitter fairing assembly with ramp fairing
incorporated and doing a general visual inspection of the IFS forward
upper fire seal and thermal insulation blanket of the left and right TR
halves for any damage. This service information also specifies
applicable on-condition actions, including replacing the IFS forward
upper fire seal and thermal insulation blanket of each TR half if
damage is found. The procedures in the service information apply to
each affected engine.
The FAA also reviewed Boeing Alert Requirements Bulletin B787-
81205-SB780041-00 RB, Issue 002, dated December 21, 2021. This service
information contains procedures for repetitive inspections of the IFS
forward upper fire seal and thermal insulation blanket of the left and
right TR halves for any damage. This service information also specifies
applicable on-condition actions, including replacing the IFS forward
upper fire seal and thermal insulation blanket of each TR half if
damage is found. The procedures in the service information apply to
each affected engine.
This AD also requires Boeing Alert Requirements Bulletin B787-
81205-SB780041-00 RB, Issue 001, dated March 31, 2020, which the
Director of the Federal Register approved for incorporation by
reference as of January 27, 2021 (85 FR 83755, December 23, 2020).
This service information is reasonably available because the
interested parties have access to it through their normal course of
business or by the means identified in ADDRESSES.
Costs of Compliance
The FAA estimates that this AD affects 13 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:
Estimated Costs
----------------------------------------------------------------------------------------------------------------
Parts
Action Labor cost cost Cost per product Cost on U.S. operators
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Inspection (retained actions 2 work-hours x $0 $170 per inspection cycle $2,210 per inspection
from AD 2020-26-08). $85 per hour = cycle.
$170 per
inspection
cycle.
Inspection or records review 1 work-hour x 0 $85...................... $1,105.
(new action). $85 per hour =
$85.
Replacement of each upper 71 work-hours x 230,000 $236,035................. $3,068,455.
splitter fairing assembly $85 per hour =
(new action). $6,035.
Inspection (new action)...... 2 work-hours x 0 $170..................... $2,210.
$85 per hour =
$170.
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The FAA estimates the following costs to do any necessary
replacements that would be required based on the results of the
inspection. The agency has no way of determining the number of aircraft
that might need these replacements:
On-Condition Costs
----------------------------------------------------------------------------------------------------------------
Action Labor cost Parts cost Cost per product
----------------------------------------------------------------------------------------------------------------
Fire seal replacement......... 2 work-hours x $1,383 per TR half....... $1,553 per TR half (4 TR halves
$85 per hour = per airplane).
$170 per TR half.
Thermal insulation blanket 1 work-hour x $85 $18,214 per TR half...... $18,299 per TR half.
replacement. per hour = $85
per TR half.
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[[Page 6427]]
According to the manufacturer, some of the costs of this AD may be
covered under warranty by Goodrich, thereby reducing the cost impact on
affected operators. The FAA does not control warranty coverage for
affected operators. As a result, the FAA has included all known costs
in the cost estimate.
Authority for This Rulemaking
Title 49 of the United States Code specifies the FAA's authority to
issue rules on aviation safety. Subtitle I, section 106, describes the
authority of the FAA Administrator. Subtitle VII: Aviation Programs,
describes in more detail the scope of the Agency's authority.
The FAA is issuing this rulemaking under the authority described in
Subtitle VII, Part A, Subpart III, Section 44701: General requirements.
Under that section, Congress charges the FAA with promoting safe flight
of civil aircraft in air commerce by prescribing regulations for
practices, methods, and procedures the Administrator finds necessary
for safety in air commerce. This regulation is within the scope of that
authority because it addresses an unsafe condition that is likely to
exist or develop on products identified in this rulemaking action.
Regulatory Findings
This AD will not have federalism implications under Executive Order
13132. This AD will not have a substantial direct effect on the States,
on the relationship between the national government and the States, or
on the distribution of power and responsibilities among the various
levels of government.
For the reasons discussed above, I certify that this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Will not affect intrastate aviation in Alaska, and
(3) Will not have a significant economic impact, positive or
negative, on a substantial number of small entities under the criteria
of the Regulatory Flexibility Act.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
The Amendment
Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 14 CFR part 39 as follows:
PART 39--AIRWORTHINESS DIRECTIVES
0
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
0
2. The FAA amends Sec. 39.13 by:
0
a. Removing Airworthiness Directive 2020-26-08, Amendment 39-21363 (85
FR 83755, December 23, 2020); and
0
b. Adding the following new Airworthiness Directive:
2024-01-04 The Boeing Company: Amendment 39-22655; Docket No. FAA-
2023-1037; Project Identifier AD-2023-00511-T.
(a) Effective Date
This airworthiness directive (AD) is effective March 7, 2024.
(b) Affected ADs
This AD replaces AD 2020-26-08, Amendment 39-21363 (85 FR 83755,
December 23, 2020) (AD 2020-26-08).
(c) Applicability
This AD applies to The Boeing Company Model 787-8, 787-9, and
787-10 airplanes, certificated in any category, with Rolls-Royce
Trent 1000 engines installed.
(d) Subject
Air Transport Association (ATA) of America Code 72, Turbine/
turboprop engine.
(e) Unsafe Condition
This AD was prompted by reports of Rolls-Royce Trent 1000
powered airplanes having damage to the thrust reverser inner fixed
structure (IFS) forward upper fire seal and damage to thermal
insulation blankets in the forward upper area of the thrust reverser
(TR). The FAA is issuing this AD to address the damage to the IFS
forward upper fire seal and the thermal insulation blankets of the
TR due to airflow through structural gapping that could occur at the
interface between the leading edge of the IFS and the engine
splitter structure during flight. Failure of the IFS forward upper
fire seal could cause the loss of seal pressurization and degrade
the ability to detect and extinguish an engine fire, resulting in an
uncontrolled fire. Damage to the TR insulation blanket could result
in thermal damage to the TR inner wall, the subsequent release of
engine exhaust components, and consequent damage to critical areas
of the airplane. Furthermore, damage to the TR inner wall and IFS
forward upper fire seal could compromise the integrity of the
firewall and its ability to contain an engine fire, resulting in an
uncontrolled fire.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Retained Actions, With Additional Service Information, Revised
Affected Airplanes, and New Terminating Action
This paragraph restates the requirements of paragraph (g) of AD
2020-26-08, with additional service information, revised affected
airplanes, and new terminating action. For airplanes with an
original airworthiness certificate or original export certificate of
airworthiness issued on or before the effective date of this AD and
for airplanes listed in the ``Effectivity'' section of Boeing Alert
Requirements Bulletin B787-81205-SB720007-00 RB, Issue 001, dated
December 12, 2022: Except as specified by paragraph (h) of this AD,
at the applicable times specified in the ``Compliance'' paragraph of
Boeing Alert Requirements Bulletin B787-81205-SB780041-00 RB, Issue
001, dated March 31, 2020, or Boeing Alert Requirements Bulletin
B787-81205-SB780041-00 RB, Issue 002, dated December 21, 2021, do
all applicable actions identified in, and in accordance with, the
Accomplishment Instructions of Boeing Alert Requirements Bulletin
B787-81205-SB780041-00 RB, Issue 001, dated March 31, 2020, or
Boeing Alert Requirements Bulletin B787-81205-SB780041-00 RB, Issue
002, dated December 21, 2021. Accomplishing the actions required by
paragraph (i)(2) of this AD terminates the actions required by this
paragraph.
Note 1 to paragraph (g): Guidance for accomplishing the actions
required by paragraph (g) of this AD can be found in Boeing Alert
Service Bulletin B787-81205-SB780041-00, Issue 001, dated March 31,
2020, which is referred to in Boeing Alert Requirements Bulletin
B787-81205-SB780041-00 RB, Issue 001, dated March 31, 2020; or in
Boeing Alert Service Bulletin B787-81205-SB780041-00, Issue 002,
dated December 21, 2021, which is referred to in Boeing Alert
Requirements Bulletin B787-81205-SB780041-00 RB, Issue 002, dated
December 21, 2021.
(h) Retained Exceptions to Service Information Specifications for
Paragraph (g) of This AD, With Additional Service Information
This paragraph restates the exceptions specified in paragraph
(h) of AD 2020-26-08, with additional service information. Where
Boeing Alert Requirements Bulletin B787-81205-SB780041-00 RB, Issue
001, dated March 31, 2020, or Boeing Alert Requirements Bulletin
B787-81205-SB780041-00 RB, Issue 002, dated December 21, 2021, uses
the phrase ``the Issue 001 date of Requirements Bulletin B787-81205-
SB780041-00 RB,'' this AD requires using January 27, 2021, (the
effective date of AD 2020-26-08).
(i) New Required Actions
(1) For airplanes with original airworthiness certificate or
original export certificate of airworthiness issued on or before the
effective date of this AD and for airplanes listed in the
``Effectivity'' section of Boeing Alert Requirements Bulletin B787-
81205-SB720007-00 RB, Issue 001, dated December 12, 2022: Within 7
years after the effective date of this AD, or within 7 years
[[Page 6428]]
after the date of issuance of the original airworthiness certificate
or original export certificate of airworthiness, whichever occurs
later, inspect the airplane to determine the part number of the
upper splitter fairing assembly installed on each engine. A review
of airplane maintenance records is acceptable in lieu of this
inspection if the part number of the upper splitter fairing assembly
can be conclusively determined from that review. For engines on
which no upper splitter fairing assembly part number (P/N) KH60375
or P/N KH11560 is installed, the actions required by paragraph (g)
of this AD are no longer required for that engine.
(2) If, during any inspection or records review required by
paragraph (i)(1) of this AD, an upper splitter fairing assembly P/N
KH60375 or P/N KH11560 is found on any engine of an airplane: Except
as specified by paragraph (j) of this AD, at the applicable times
specified in the ``Compliance'' paragraph of Boeing Alert
Requirements Bulletin B787-81205-SB720007-00 RB, Issue 001, dated
December 12, 2022, do all applicable actions identified in, and in
accordance with, the Accomplishment Instructions of Boeing Alert
Requirements Bulletin B787-81205-SB720007-00 RB, Issue 001, dated
December 12, 2022, for each affected engine. Accomplishing the
actions required by this paragraph on all affected engines of an
airplane terminates the actions required by paragraph (g) of this AD
for that airplane.
Note 2 to paragraph (i)(2): Guidance for accomplishing the
actions required by paragraph (i)(2) of this AD can be found in
Boeing Alert Service Bulletin B787-81205-SB720007-00, Issue 001,
dated December 12, 2022, which is referred to in Boeing Alert
Requirements Bulletin B787-81205-SB720007-00 RB, Issue 001, dated
December 12, 2022.
(j) Exceptions to Service Information Specifications for Paragraph
(i)(2) of This AD
(1) Where the Compliance Time column of table 5 in the
``Compliance'' paragraph of Boeing Alert Requirements Bulletin B787-
81205-SB720007-00 RB, Issue 001, dated December 12, 2022, uses the
phrase ``the Issue 001 date of Requirements Bulletin B787-81205-
SB720007-00 RB,'' this AD requires using ``the effective date of
this AD.''
(2) Where the service information referenced in Boeing Alert
Requirements Bulletin B787-81205-SB720007-00 RB, Issue 001, dated
December 12, 2022, specifies to remove the existing upper splitter
fairing assembly P/N KH60375, this AD requires removing the existing
upper splitter fairing assembly P/N KH60375 or P/N KH11560.
(k) Parts Installation Prohibition
(1) For airplanes with an original airworthiness certificate or
original export certificate of airworthiness issued after the
effective date of this AD, except for airplanes listed in Boeing
Alert Requirements Bulletin B787-81205-SB720007-00 RB, Issue 001,
dated December 12, 2022: As of the effective date of this AD, no
person may install an engine with an upper splitter fairing assembly
P/N KH60375 or P/N KH11560 on any airplane.
(2) For airplanes with original airworthiness certificate or
original export certificate of airworthiness issued on or before the
effective date of this AD and for airplanes listed in Boeing Alert
Requirements Bulletin B787-81205-SB720007-00 RB, Issue 001, dated
December 12, 2022, on which, during the actions required by
paragraph (i)(1) of this AD, no upper splitter fairing assembly P/N
KH60375 or P/N KH11560 was installed on both engines: After
accomplishing the inspection or records review required by paragraph
(i)(1) of this AD, no person may install an engine with an upper
splitter fairing assembly P/N KH60375 or P/N KH11560 for replacement
of an engine on those airplanes.
(l) 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 AIR-520, Continued
Operational Safety Branch, send it to the attention of the person
identified in paragraph (m) of this AD. Information may be emailed
to <a href="/cdn-cgi/l/email-protection#30091d717e7d1d63555144445c551d71737f1d717d7f731d6255414555434443705651511e575f46"><span class="__cf_email__" data-cfemail="c2fbef838c8fef91a7a3b6b6aea7ef83818def838f8d81ef90a7b3b7a7b1b6b182a4a3a3eca5adb4">[email protected]</span></a>.
(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, 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.
(m) Related Information
For more information about this AD, contact Tak Kobayashi,
Aviation Safety Engineer, FAA, 2200 South 216th Street, Des Moines,
WA 98198; telephone 206-231-3553; email <a href="/cdn-cgi/l/email-protection#0a7e6b616b6263796b246165686b736b7962634a6c6b6b246d657c"><span class="__cf_email__" data-cfemail="b5c1d4ded4dddcc6d49bdedad7d4ccd4c6dddcf5d3d4d49bd2dac3">[email protected]</span></a>.
(n) 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 this AD specifies otherwise.
(3) The following service information was approved for IBR on
March 7, 2024.
(i) Boeing Alert Requirements Bulletin B787-81205-SB720007-00
RB, Issue 001, dated December 12, 2022.
(ii) Boeing Alert Requirements Bulletin B787-81205-SB780041-00
RB, Issue 002, dated December 21, 2021.
(4) The following service information was approved for IBR on
January 27, 2021 (85 FR 83755, December 23, 2020).
(i) Boeing Alert Requirements Bulletin B787-81205-SB780041-00
RB, Issue 001, dated March 31, 2020.
(ii) [Reserved]
(5) For service information identified in this AD, contact
Boeing Commercial Airplanes, Attention: Contractual & Data Services
(C&DS), 2600 Westminster Boulevard, MC 110-SK57, Seal Beach, CA
90740-5600; telephone 562-797-1717; website <a href="http://myboeingfleet.com">myboeingfleet.com</a>.
(6) You may view this service information at the FAA,
Airworthiness Products Section, Operational Safety Branch, 2200
South 216th Street, Des Moines, WA. For information on the
availability of this material at the FAA, call 206-231-3195.
(7) You may view this material at the National Archives and
Records Administration (NARA). For information on the availability
of this material at NARA, visit <a href="http://www.archives.gov/federal-register/cfr/ibr-locations">www.archives.gov/federal-register/cfr/ibr-locations</a> or email <a href="/cdn-cgi/l/email-protection#deb8acf0b7b0adaebbbdaab7b1b09eb0bfacbff0b9b1a8"><span class="__cf_email__" data-cfemail="e98f9bc780879a998c8a9d808687a987889b88c78e869f">[email protected]</span></a>.
Issued on January 6, 2024.
Caitlin Locke,
Director, Compliance & Airworthiness Division, Aircraft Certification
Service.
[FR Doc. 2024-01969 Filed 1-31-24; 8:45 am]
BILLING CODE 4910-13-P
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