Airworthiness Directives; The Boeing Company Airplanes, 13276-13278 [2025-04782]
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Federal Register / Vol. 90, No. 54 / Friday, March 21, 2025 / Rules and Regulations
regarding an appropriate length of
postponement.
(Authority: 5 U.S.C. 553; 15 U.S.C. 1823–
1825 and 1828; 7 CFR 2.22, 2.80, and 371.7.)
Done in Washington, DC, this 17th day of
March 2025.
Michael Watson,
Administrator, Animal and Plant Health
Inspection Service, USDA.
[FR Doc. 2025–04813 Filed 3–20–25; 8:45 am]
BILLING CODE 3410–34–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket FAA–2023–2234; Project Identifier
AD–2023–00963–T; Amendment 39–22960;
AD 2025–04–02]
RIN 2120–AA64
Airworthiness Directives; The Boeing
Company Airplanes
Federal Aviation
Administration (FAA), DOT.
ACTION: Final rule; correction.
AGENCY:
The FAA is correcting an
airworthiness directive (AD) that was
published in the Federal Register. That
AD applies to all The Boeing Company
Model 737–600, –700, –700C, –800,
–900, and –900ER series airplanes. As
published, the service information
referenced in certain paragraphs of the
regulatory text is incorrect, and the
dates specified in the ‘‘System
Airworthiness Limitation No. 3—Fan
Blade Out Conditions’’ text and ‘‘System
Airworthiness Limitation No. 4—Engine
Nacelle Maintenance Errors’’ text of
figure 1 to paragraph (j) of the regulatory
text are incorrect. This document
corrects those errors. In all other
respects, the original document remains
the same.
DATES: This correction is effective April
8, 2025. The effective date of AD 2025–
04–02 remains April 8, 2025.
The Director of the Federal Register
approved the incorporation by reference
of a certain publication listed in this AD
as of April 8, 2025 (90 FR 11109, March
4, 2025).
ADDRESSES:
AD Docket: You may examine the AD
docket at regulations.gov by searching
for and locating Docket No. FAA–2023–
2234; 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 street address for
Docket Operations is listed above.
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SUMMARY:
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Material Incorporated by Reference:
• For Boeing material 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.
• You may view this material 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
under Docket No. FAA–2023–2234.
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: AD 2025–
04–02, Amendment 39–22960 (90 FR
11109, March 4, 2025) (AD 2025–04–
02), requires replacing the fasteners on
the fan cowl support beam hinge fittings
for certain airplanes and, for all
airplanes, requires modifying the radial
restraint assembly and installing an
external doubler at the starter vent, or as
an option, installing a serviceable fan
cowl. AD 2025–04–02 also requires
revising the existing maintenance or
inspection program, as applicable, to
incorporate new airworthiness
limitations. AD 2025–04–02 applies to
all The Boeing Company Model 737–
600, –700, –700C, –800, –900, and
–900ER series airplanes.
Need for Correction
As published, the service information
referenced in certain paragraphs of the
regulatory text is incorrect, and the
dates specified in the ‘‘System
Airworthiness Limitation No. 3—Fan
Blade Out Conditions’’ text and ‘‘System
Airworthiness Limitation No. 4—Engine
Nacelle Maintenance Errors’’ text of
figure 1 to paragraph (j) of the regulatory
text are incorrect.
Paragraphs (h)(4), (h)(5), and (h)(7) of
the regulatory text inadvertently
referred to ‘‘Boeing Special Attention
Requirements Bulletin 737–71–1938 RB,
Revision 1, dated June 27, 2024,’’
instead of ‘‘Boeing Special Attention
Requirements Bulletin 737–71–1937 RB,
Revision 1, dated June 27, 2024.’’
Paragraph (h)(4) of the regulatory text
also inadvertently referred to ‘‘Collins
Aerospace Service Bulletin 737NG–71–
007,’’ instead of ‘‘Collins Aerospace
Service Bulletin 737NG–71–008,’’ and
inadvertently referred to ‘‘Material
Necessary for Each Inlet Assembly’’
instead of ‘‘Material Necessary for Each
Component.’’
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Paragraph (h)(7) of the regulatory text
also included a reference to Collins
Service Bulletin 737NG–71–008 but
inadvertently included a date of ‘‘July
28, 2023’’ that is not necessary since the
paragraph is referring to the Collins
Service Bulletin 737NG–71–008
identified in Boeing Special Attention
Requirements Bulletin 737–71–1937 RB,
Revision 1, dated June 27, 2024, and
should match how paragraphs (h)(4) and
(5) of the regulatory text refer to Collins
Service Bulletin 737NG–71–008 without
a date.
Paragraph (j) of the regulatory text
inadvertently included a reference to
Boeing Special Attention Requirements
Bulletin 737–71–1937 RB with the date
of ‘‘June 27, 2024’’ instead of ‘‘July 27,
2023.’’
In addition, the date specified in the
‘‘System Airworthiness Limitation No.
3—Fan Blade Out Conditions’’ text of
figure 1 to paragraph (j) of the regulatory
text inadvertently referred to ‘‘July 31,
2018’’ instead of ‘‘July 31, 2028,’’ and
the date specified in the ‘‘System
Airworthiness Limitation No. 4—Engine
Nacelle Maintenance Errors’’ text of
figure 1 to paragraph (j) of the regulatory
text inadvertently referred to ‘‘December
31, 2019’’ instead of ‘‘December 31,
2029.’’
Material Incorporated by Reference
Under 1 CFR Part 51
The FAA reviewed Boeing Special
Attention Requirements Bulletin 737–
71–1937 RB, Revision 1, dated June 27,
2024. This material specifies procedures
for replacing, for certain airplanes, the
fasteners on the fan cowl support beam
hinge fittings on the left and right
engine strut, and, for engine 1 and
engine 2 for all airplanes, modifying the
radial restraint assembly and installing
an external doubler at the starter vent,
or as an option, installing a serviceable
fan cowl. This material also specifies
procedures to incorporate Boeing 737–
600/700/700C/800/900/900ER
Airworthiness Limitations (AWLs)
Document D626A001–9–01 ‘‘System
Airworthiness Limitation No. 2—Fan
Blade Out Conditions,’’ ‘‘System
Airworthiness Limitation No. 3—Fan
Blade Out Conditions,’’ and ‘‘System
Airworthiness Limitation No. 4—Engine
Nacelle Maintenance Errors’’ into the
operator’s maintenance or inspection
program.
This material is reasonably available
because the interested parties have
access to it through their normal course
of business or by the means identified
in ADDRESSES.
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Federal Register / Vol. 90, No. 54 / Friday, March 21, 2025 / Rules and Regulations
Correction of Publication
(e) Unsafe Condition
This document corrects several errors
and correctly adds the AD as an
amendment to 14 CFR 39.13. Although
no part of the preamble and no other
part of the regulatory information has
been corrected, the FAA is publishing
the entire rule in the Federal Register.
The effective date of this AD remains
April 8, 2025.
Since this action only corrects service
information referenced in paragraphs
that provide relief to the required
actions and corrects a date for an
airworthiness limitation by specifying a
later date, it has no adverse economic
impact and imposes no additional
burden on any person. Therefore, the
FAA has determined that notice and
public comment procedures are
unnecessary.
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 subsequent
emergency descent. The FAA is issuing this
AD to address fan cowls that are not
strengthened, which, in the event of an FBO
occurrence, could depart the nacelle
potentially damaging a stabilizer, or the fan
cowl striking the fuselage and window. The
unsafe condition, if not addressed, could
result in loss of control of the airplane, or in
a rapid decompression and hazard to
window-seated passengers aft of the wing.
List of Subjects in 14 CFR Part 39
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–
1937 RB, Revision 1, dated June 27, 2024, do
all applicable actions identified in, and in
accordance with, the Accomplishment
Instructions of Boeing Special Attention
Requirements Bulletin 737–71–1937 RB,
Revision 1, dated June 27, 2024.
Note 1 to paragraph (g): Guidance for
accomplishing the actions required by this
AD can be found in Boeing Special Attention
Service Bulletin 737–71–1937, Revision 1,
dated June 27, 2024, which is referred to in
Boeing Special Attention Requirements
Bulletin 737–71–1937 RB, Revision 1, dated
June 27, 2024.
Air transportation, Aircraft, Aviation
safety, Incorporation by reference,
Safety.
Adoption of the Amendment
Accordingly, pursuant to the
authority delegated to me by the
Administrator, the Federal Aviation
Administration amends part 39 of the
Federal Aviation Regulations (14 CFR
part 39) as follows:
PART 39—AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:
■
Authority: 49 U.S.C. 106(f), 40113, 44701.
§ 39.13
[Corrected]
2. The FAA amends § 39.13 by adding
the following new airworthiness
directive:
■
2025–04–02 The Boeing Company:
Amendment 39–22960; Docket No.
FAA–2023–2234; Project Identifier AD–
2023–00963–T.
(a) Effective Date
This airworthiness directive (AD) is
effective April 8, 2025.
(b) Affected ADs
None.
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(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.
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(f) Compliance
Comply with this AD within the
compliance times specified, unless already
done.
(g) Required Actions
(h) Exceptions to Service Information
Specifications
(1) Where the service information
referenced in paragraph (g) of this AD
specifies contacting Boeing or Collins
Aerospace for repair instructions: This AD
requires doing the repair before further flight
using a method approved in accordance with
the procedures specified in paragraph (k) of
this AD.
(2) Where the Compliance Time columns
of the tables in the ‘‘Compliance’’ paragraph
of Boeing Special Attention Requirements
Bulletin 737–71–1937 RB, Revision 1, dated
June 27, 2024, refer to the original issue date
of Requirements Bulletin 737–71–1937 RB,
this AD requires using the effective date of
this AD.
(3) Where System Airworthiness
Limitation No. 4, as identified in Boeing
Special Attention Requirements Bulletin
737–71–1937 RB, Revision 1, dated June 27,
2024, requires incorporation of solutions to
address potential engine nacelle maintenance
errors, solutions consist of a re-designed fan
cowl latch and keeper and application of
high visibility paint on the interior of the
integrated drive generator (IDG) door.
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13277
(4) Where Collins Aerospace Service
Bulletin 737NG–71–008 referenced in Boeing
Special Attention Requirements Bulletin
737–71–1937 RB, Revision 1, dated June 27,
2024, specifies use of Bonderite M–CR 1200S
Aero, 10P4–2NF primer, EC–117S converter,
TR19 thinner, or T20 thinner, this AD also
allows for equivalent material substitutes as
specified in paragraph 2.C., ‘‘Material
Necessary for Each Component,’’ of Collins
Aerospace Service Bulletin 737NG–71–008
referenced in Boeing Special Attention
Requirements Bulletin 737–71–1937 RB,
Revision 1, dated June 27, 2024.
(5) Where Collins Service Bulletin 737NG–
71–008 referenced in Boeing Special
Attention Requirements Bulletin 737–71–
1937 RB, Revision 1, dated June 27, 2024,
states to apply primer ‘‘per Boeing document
D6–1816,’’ this AD requires replacing that
text with ‘‘per Boeing document D6–1816 or
Boeing SOPM 20–41–02.’’
(6) Where Boeing Special Attention
Requirements Bulletin 737–71–1937 RB,
Revision 1, dated June 27, 2024, requires
(Option 1) (Action 3) to be accomplished
after (Option 1) (Action 2), this AD allows
these two actions to be accomplished
concurrently.
(7) Where Collins Service Bulletin 737NG–
71–008 referenced in Boeing Special
Attention Requirements Bulletin 737–71–
1937 RB, Revision 1, dated June 27, 2024,
specifies to topcoat over the repair area to
agree with the initial production topcoat, this
AD also allows topcoat to match the
surrounding topcoat.
(i) No Alternative Actions
After the existing maintenance or
inspection program has been revised as
required by paragraph (g) 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 (k) of this AD.
(j) Credit for Previous Actions
This paragraph provides credit for the
actions specified in paragraph (g) of this AD,
if those actions were performed before the
effective date of this AD using Boeing Special
Attention Requirements Bulletin 737–71–
1937 RB, dated July 27, 2023, provided
where Tables 1 through 4 of Boeing Special
Attention Requirements Bulletin 737–71–
1937 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, the information specified in figure
1 to paragraph (j) of this AD has been
incorporated into the airworthiness
limitations.
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Federal Register / Vol. 90, No. 54 / Friday, March 21, 2025 / Rules and Regulations
FIGURE 1 TO PARAGRAPH (j)—SYSTEM AIRWORTHINESS LIMITATIONS
SYSTEM AIRWORTHINESS LIMITATION No. 2
FAN BLADE OUT CONDITIONS
All aircraft must install the following modifications: (1) engines inlets with new spacer design and increased fastener capability (2) fan cowls
with new radial restraint fitting hooks, new radial restraint clips, and an external doubler at the starter vent (3) fan cowl support beam fastener
changes (except for 737–900ER aircraft, because the fan cowl support beam fastener changes are already incorporated). All aircraft that have
not incorporated these modifications cannot operate past July 31, 2028 unless upgraded to new hardware that is fully compliant to
§§ 25.901(c) and Appendix K25.1.1 to Part 25. Boeing will release all service data to allow retrofit of hardware updates to the CFM56–7B nacelle prior to that date.
SYSTEM AIRWORTHINESS LIMITATION No. 3
FAN BLADE OUT CONDITIONS
All aircraft delivered without the Performance Improvement Package (PIP) must install engine exhaust nozzle structural stiffening elements. All
aircraft that have not incorporated these modifications cannot operate past July 31, 2028 unless upgraded to new hardware that is fully compliant to §§ 25.901(c) and Appendix K25.1.1 to Part 25. Boeing will release all service data to allow retrofit of hardware updates to the CFM56–
7B nacelle prior to that date.
SYSTEM AIRWORTHINESS LIMITATION No. 4
ENGINE NACELLE MAINTENANCE ERRORS
All aircraft must incorporate solutions to address potential maintenance errors, e.g., the failure to completely latch the fan cowl or the can cowl
integrated drive generator (IDG) door. All aircraft that have not incorporated changes to become fully compliance with §§ 25.901(c) and Appendix K25.1.1 to Part 25 cannot be operated past December 31, 2029.
(m) Material Incorporated by Reference
(k) 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 (l)(1) of this AD.
Information may be emailed to: AMOC@
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.
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(l) Related Information
(1) 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: luis.a.cortez-muniz@faa.gov.
(2) For Collins material identified in this
AD that is not incorporated by reference,
contact Collins Aerospace, 15701 West 95th
Street, Lenexa, KS 66219; email
ISPublications@collins.com; website
tpi.beaerospace.com/Authentication.
(3) Boeing material identified in this AD
that is not incorporated by reference is
available at the address specified in
paragraph (m)(3) this AD.
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(1) The Director of the Federal Register
approved the incorporation by reference
(IBR) of the material listed in this paragraph
under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) You must use this material as
applicable to do the actions required by this
AD, unless this AD specifies otherwise.
(3) The following material was approved
for IBR on April 8, 2025 (90 FR 11109, March
4, 2025).
(i) Boeing Special Attention Requirements
Bulletin 737–71–1937 RB, Revision 1, dated
June 27, 2024.
(ii) [Reserved]
(4) For Boeing material 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.
(5) You may view this material 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.
(6) 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 March 17, 2025.
Victor Wicklund,
Deputy Director, Integrated Certificate
Management Division, Aircraft Certification
Service.
[FR Doc. 2025–04782 Filed 3–20–25; 8:45 am]
BILLING CODE 4910–13–P
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA–2024–1896; Project
Identifier MCAI–2023–00978–T; Amendment
39–22966; AD 2025–04–08]
RIN 2120–AA64
Airworthiness Directives; MHI RJ
Aviation ULC (Type Certificate
Previously Held by Bombardier Inc.)
Airplanes
Federal Aviation
Administration (FAA), DOT.
ACTION: Final rule.
AGENCY:
The FAA is adopting a new
airworthiness directive (AD) for certain
MHI RJ Aviation ULC Model CL–600–
2B19 (Regional Jet Series 100 and 440),
CL–600–2C10 (Regional Jet Series 700,
701, and 702), CL–600–2C11 (Regional
Jet Series 550), CL–600–2D15 (Regional
Jet Series 705), CL–600–2D24 (Regional
Jet Series 900), and CL–600–2E25
(Regional Jet Series 1000) airplanes.
This AD was prompted by the
determination that radio altimeters
cannot be relied upon to perform their
intended function if they experience
interference from wireless broadband
operations in the 3.7–3.98 GHz
frequency band (5G C-Band). This AD
requires installing a new radio
frequency (RF) bandpass filter on the
coaxial line between the radio altimeter
and the receive antenna in the aft
equipment compartment. The FAA is
issuing this AD to address the unsafe
condition on these products.
DATES: This AD is effective April 25,
2025.
SUMMARY:
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]]>Agencies
[Federal Register Volume 90, Number 54 (Friday, March 21, 2025)]
[Rules and Regulations]
[Pages 13276-13278]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2025-04782]
=======================================================================
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket FAA-2023-2234; Project Identifier AD-2023-00963-T; Amendment
39-22960; AD 2025-04-02]
RIN 2120-AA64
Airworthiness Directives; The Boeing Company Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule; correction.
-----------------------------------------------------------------------
SUMMARY: The FAA is correcting an airworthiness directive (AD) that was
published in the Federal Register. That AD applies to all The Boeing
Company Model 737-600, -700, -700C, -800, -900, and -900ER series
airplanes. As published, the service information referenced in certain
paragraphs of the regulatory text is incorrect, and the dates specified
in the ``System Airworthiness Limitation No. 3--Fan Blade Out
Conditions'' text and ``System Airworthiness Limitation No. 4--Engine
Nacelle Maintenance Errors'' text of figure 1 to paragraph (j) of the
regulatory text are incorrect. This document corrects those errors. In
all other respects, the original document remains the same.
DATES: This correction is effective April 8, 2025. The effective date
of AD 2025-04-02 remains April 8, 2025.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of April 8,
2025 (90 FR 11109, March 4, 2025).
ADDRESSES:
AD Docket: You may examine the AD docket at regulations.gov by
searching for and locating Docket No. FAA-2023-2234; 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 street address for Docket
Operations is listed above.
Material Incorporated by Reference:
For Boeing material 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.
You may view this material 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 under
Docket No. FAA-2023-2234.
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: AD 2025-04-02, Amendment 39-22960 (90 FR
11109, March 4, 2025) (AD 2025-04-02), requires replacing the fasteners
on the fan cowl support beam hinge fittings for certain airplanes and,
for all airplanes, requires modifying the radial restraint assembly and
installing an external doubler at the starter vent, or as an option,
installing a serviceable fan cowl. AD 2025-04-02 also requires revising
the existing maintenance or inspection program, as applicable, to
incorporate new airworthiness limitations. AD 2025-04-02 applies to all
The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER
series airplanes.
Need for Correction
As published, the service information referenced in certain
paragraphs of the regulatory text is incorrect, and the dates specified
in the ``System Airworthiness Limitation No. 3--Fan Blade Out
Conditions'' text and ``System Airworthiness Limitation No. 4--Engine
Nacelle Maintenance Errors'' text of figure 1 to paragraph (j) of the
regulatory text are incorrect.
Paragraphs (h)(4), (h)(5), and (h)(7) of the regulatory text
inadvertently referred to ``Boeing Special Attention Requirements
Bulletin 737-71-1938 RB, Revision 1, dated June 27, 2024,'' instead of
``Boeing Special Attention Requirements Bulletin 737-71-1937 RB,
Revision 1, dated June 27, 2024.''
Paragraph (h)(4) of the regulatory text also inadvertently referred
to ``Collins Aerospace Service Bulletin 737NG-71-007,'' instead of
``Collins Aerospace Service Bulletin 737NG-71-008,'' and inadvertently
referred to ``Material Necessary for Each Inlet Assembly'' instead of
``Material Necessary for Each Component.''
Paragraph (h)(7) of the regulatory text also included a reference
to Collins Service Bulletin 737NG-71-008 but inadvertently included a
date of ``July 28, 2023'' that is not necessary since the paragraph is
referring to the Collins Service Bulletin 737NG-71-008 identified in
Boeing Special Attention Requirements Bulletin 737-71-1937 RB, Revision
1, dated June 27, 2024, and should match how paragraphs (h)(4) and (5)
of the regulatory text refer to Collins Service Bulletin 737NG-71-008
without a date.
Paragraph (j) of the regulatory text inadvertently included a
reference to Boeing Special Attention Requirements Bulletin 737-71-1937
RB with the date of ``June 27, 2024'' instead of ``July 27, 2023.''
In addition, the date specified in the ``System Airworthiness
Limitation No. 3--Fan Blade Out Conditions'' text of figure 1 to
paragraph (j) of the regulatory text inadvertently referred to ``July
31, 2018'' instead of ``July 31, 2028,'' and the date specified in the
``System Airworthiness Limitation No. 4--Engine Nacelle Maintenance
Errors'' text of figure 1 to paragraph (j) of the regulatory text
inadvertently referred to ``December 31, 2019'' instead of ``December
31, 2029.''
Material Incorporated by Reference Under 1 CFR Part 51
The FAA reviewed Boeing Special Attention Requirements Bulletin
737-71-1937 RB, Revision 1, dated June 27, 2024. This material
specifies procedures for replacing, for certain airplanes, the
fasteners on the fan cowl support beam hinge fittings on the left and
right engine strut, and, for engine 1 and engine 2 for all airplanes,
modifying the radial restraint assembly and installing an external
doubler at the starter vent, or as an option, installing a serviceable
fan cowl. This material also specifies procedures to incorporate Boeing
737-600/700/700C/800/900/900ER Airworthiness Limitations (AWLs)
Document D626A001-9-01 ``System Airworthiness Limitation No. 2--Fan
Blade Out Conditions,'' ``System Airworthiness Limitation No. 3--Fan
Blade Out Conditions,'' and ``System Airworthiness Limitation No. 4--
Engine Nacelle Maintenance Errors'' into the operator's maintenance or
inspection program.
This material is reasonably available because the interested
parties have access to it through their normal course of business or by
the means identified in ADDRESSES.
[[Page 13277]]
Correction of Publication
This document corrects several errors and correctly adds the AD as
an amendment to 14 CFR 39.13. Although no part of the preamble and no
other part of the regulatory information has been corrected, the FAA is
publishing the entire rule in the Federal Register.
The effective date of this AD remains April 8, 2025.
Since this action only corrects service information referenced in
paragraphs that provide relief to the required actions and corrects a
date for an airworthiness limitation by specifying a later date, it has
no adverse economic impact and imposes no additional burden on any
person. Therefore, the FAA has determined that notice and public
comment procedures are unnecessary.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
Adoption of the Amendment
Accordingly, pursuant to the authority delegated to me by the
Administrator, the Federal Aviation Administration amends part 39 of
the Federal Aviation Regulations (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(f), 40113, 44701.
Sec. 39.13 [Corrected]
0
2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive:
2025-04-02 The Boeing Company: Amendment 39-22960; Docket No. FAA-
2023-2234; Project Identifier AD-2023-00963-T.
(a) Effective Date
This airworthiness directive (AD) is effective April 8, 2025.
(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 subsequent
emergency descent. The FAA is issuing this AD to address fan cowls
that are not strengthened, which, in the event of an FBO occurrence,
could depart the nacelle potentially damaging a stabilizer, or the
fan cowl striking the fuselage and window. The unsafe condition, if
not addressed, could result in loss of control of the airplane, or
in a rapid decompression and hazard to window-seated passengers aft
of the wing.
(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 737-71-1937 RB, Revision 1,
dated June 27, 2024, do all applicable actions identified in, and in
accordance with, the Accomplishment Instructions of Boeing Special
Attention Requirements Bulletin 737-71-1937 RB, Revision 1, dated
June 27, 2024.
Note 1 to paragraph (g): Guidance for accomplishing the actions
required by this AD can be found in Boeing Special Attention Service
Bulletin 737-71-1937, Revision 1, dated June 27, 2024, which is
referred to in Boeing Special Attention Requirements Bulletin 737-
71-1937 RB, Revision 1, dated June 27, 2024.
(h) Exceptions to Service Information Specifications
(1) Where the service information referenced in paragraph (g) of
this AD specifies contacting Boeing or Collins Aerospace for repair
instructions: This AD requires doing the repair before further
flight using a method approved in accordance with the procedures
specified in paragraph (k) of this AD.
(2) Where the Compliance Time columns of the tables in the
``Compliance'' paragraph of Boeing Special Attention Requirements
Bulletin 737-71-1937 RB, Revision 1, dated June 27, 2024, refer to
the original issue date of Requirements Bulletin 737-71-1937 RB,
this AD requires using the effective date of this AD.
(3) Where System Airworthiness Limitation No. 4, as identified
in Boeing Special Attention Requirements Bulletin 737-71-1937 RB,
Revision 1, dated June 27, 2024, requires incorporation of solutions
to address potential engine nacelle maintenance errors, solutions
consist of a re-designed fan cowl latch and keeper and application
of high visibility paint on the interior of the integrated drive
generator (IDG) door.
(4) Where Collins Aerospace Service Bulletin 737NG-71-008
referenced in Boeing Special Attention Requirements Bulletin 737-71-
1937 RB, Revision 1, dated June 27, 2024, specifies use of Bonderite
M-CR 1200S Aero, 10P4-2NF primer, EC-117S converter, TR19 thinner,
or T20 thinner, this AD also allows for equivalent material
substitutes as specified in paragraph 2.C., ``Material Necessary for
Each Component,'' of Collins Aerospace Service Bulletin 737NG-71-008
referenced in Boeing Special Attention Requirements Bulletin 737-71-
1937 RB, Revision 1, dated June 27, 2024.
(5) Where Collins Service Bulletin 737NG-71-008 referenced in
Boeing Special Attention Requirements Bulletin 737-71-1937 RB,
Revision 1, dated June 27, 2024, states to apply primer ``per Boeing
document D6-1816,'' this AD requires replacing that text with ``per
Boeing document D6-1816 or Boeing SOPM 20-41-02.''
(6) Where Boeing Special Attention Requirements Bulletin 737-71-
1937 RB, Revision 1, dated June 27, 2024, requires (Option 1)
(Action 3) to be accomplished after (Option 1) (Action 2), this AD
allows these two actions to be accomplished concurrently.
(7) Where Collins Service Bulletin 737NG-71-008 referenced in
Boeing Special Attention Requirements Bulletin 737-71-1937 RB,
Revision 1, dated June 27, 2024, specifies to topcoat over the
repair area to agree with the initial production topcoat, this AD
also allows topcoat to match the surrounding topcoat.
(i) No Alternative Actions
After the existing maintenance or inspection program has been
revised as required by paragraph (g) 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 (k) of this AD.
(j) Credit for Previous Actions
This paragraph provides credit for the actions specified in
paragraph (g) of this AD, if those actions were performed before the
effective date of this AD using Boeing Special Attention
Requirements Bulletin 737-71-1937 RB, dated July 27, 2023, provided
where Tables 1 through 4 of Boeing Special Attention Requirements
Bulletin 737-71-1937 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,
the information specified in figure 1 to paragraph (j) of this AD
has been incorporated into the airworthiness limitations.
[[Page 13278]]
Figure 1 to Paragraph (j)--System Airworthiness Limitations
------------------------------------------------------------------------
-------------------------------------------------------------------------
SYSTEM AIRWORTHINESS LIMITATION No. 2
FAN BLADE OUT CONDITIONS
All aircraft must install the following modifications: (1) engines
inlets with new spacer design and increased fastener capability (2) fan
cowls with new radial restraint fitting hooks, new radial restraint
clips, and an external doubler at the starter vent (3) fan cowl support
beam fastener changes (except for 737-900ER aircraft, because the fan
cowl support beam fastener changes are already incorporated). All
aircraft that have not incorporated these modifications cannot operate
past July 31, 2028 unless upgraded to new hardware that is fully
compliant to Sec. Sec. 25.901(c) and Appendix K25.1.1 to Part 25.
Boeing will release all service data to allow retrofit of hardware
updates to the CFM56-7B nacelle prior to that date.
SYSTEM AIRWORTHINESS LIMITATION No. 3
FAN BLADE OUT CONDITIONS
All aircraft delivered without the Performance Improvement Package (PIP)
must install engine exhaust nozzle structural stiffening elements. All
aircraft that have not incorporated these modifications cannot operate
past July 31, 2028 unless upgraded to new hardware that is fully
compliant to Sec. Sec. 25.901(c) and Appendix K25.1.1 to Part 25.
Boeing will release all service data to allow retrofit of hardware
updates to the CFM56-7B nacelle prior to that date.
SYSTEM AIRWORTHINESS LIMITATION No. 4
ENGINE NACELLE MAINTENANCE ERRORS
All aircraft must incorporate solutions to address potential maintenance
errors, e.g., the failure to completely latch the fan cowl or the can
cowl integrated drive generator (IDG) door. All aircraft that have not
incorporated changes to become fully compliance with Sec. Sec.
25.901(c) and Appendix K25.1.1 to Part 25 cannot be operated past
December 31, 2029.
------------------------------------------------------------------------
(k) 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
(l)(1) 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.
(l) Related Information
(1) 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].
(2) For Collins material identified in this AD that is not
incorporated by reference, contact Collins Aerospace, 15701 West
95th Street, Lenexa, KS 66219; email [email protected];
website tpi.beaerospace.com/Authentication.
(3) Boeing material identified in this AD that is not
incorporated by reference is available at the address specified in
paragraph (m)(3) this AD.
(m) Material Incorporated by Reference
(1) The Director of the Federal Register approved the
incorporation by reference (IBR) of the material listed in this
paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) You must use this material as applicable to do the actions
required by this AD, unless this AD specifies otherwise.
(3) The following material was approved for IBR on April 8, 2025
(90 FR 11109, March 4, 2025).
(i) Boeing Special Attention Requirements Bulletin 737-71-1937
RB, Revision 1, dated June 27, 2024.
(ii) [Reserved]
(4) For Boeing material 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.
(5) You may view this material 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.
(6) 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].
Issued on March 17, 2025.
Victor Wicklund,
Deputy Director, Integrated Certificate Management Division, Aircraft
Certification Service.
[FR Doc. 2025-04782 Filed 3-20-25; 8:45 am]
BILLING CODE 4910-13-P
