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Proposed Rule2024-21211

Airworthiness Directives; The Boeing Company Airplanes

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Published

September 20, 2024

Issuing agencies

Transportation DepartmentFederal Aviation Administration

Abstract

The FAA is revising a notice of proposed rulemaking (NPRM) that would apply to all The Boeing Company Model 777-200, -200LR, -300, -300ER, and 777F series airplanes. This action revises the NPRM by changing certain proposed actions from ultrasonic inspections (UT) to open hole high frequency eddy current (HFEC) inspections. The FAA is proposing this airworthiness directive (AD) to address the unsafe condition on these products. Since these actions would impose an additional burden over that in the NPRM, the FAA is requesting comments on this SNPRM.

Full Text

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<title>Federal Register, Volume 89 Issue 183 (Friday, September 20, 2024)</title>
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[Federal Register Volume 89, Number 183 (Friday, September 20, 2024)]
[Proposed Rules]
[Pages 77049-77053]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2024-21211]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2023-2151; Project Identifier AD-2023-00984-T]
RIN 2120-AA64

Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Supplemental notice of proposed rulemaking (SNPRM).

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SUMMARY: The FAA is revising a notice of proposed rulemaking (NPRM)
that would apply to all The Boeing Company Model 777-200, -200LR, -300,
-300ER, and 777F series airplanes. This action revises the NPRM by
changing certain proposed actions from ultrasonic inspections (UT) to
open hole high frequency eddy current (HFEC) inspections. The FAA is
proposing this airworthiness directive (AD) to address the unsafe
condition on these products. Since these actions would impose an
additional burden over that in the NPRM, the FAA is requesting comments
on this SNPRM.

DATES: The FAA must receive comments on this SNPRM by November 4, 2024.

ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
<bullet> Federal eRulemaking Portal: Go to <a href="http://regulations.gov">regulations.gov</a>. Follow
the instructions for submitting comments.
<bullet> Fax: 202-493-2251.
<bullet> Mail: U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE, Washington, DC 20590.
<bullet> Hand Delivery: Deliver to Mail address above between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
AD Docket: You may examine the AD docket at <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2023-2151; or in person at Docket Operations between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD
docket contains the NPRM, this SNPRM, any comments received, and other
information. The street address for Docket Operations is listed above.
Material Incorporated by Reference:
<bullet> For Boeing material identified in this proposed 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 <a href="http://myboeingfleet.com">myboeingfleet.com</a>.
<bullet> 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 <a href="http://regulations.gov">regulations.gov</a> under
Docket No. FAA-2023-2151.

FOR FURTHER INFORMATION CONTACT: Luis Cortez-Muniz, Aviation Safety
Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 206-
231-3958; email: <a href="/cdn-cgi/l/email-protection#327e475b411c731c715d404657481f7f475c5b48725453531c555d44">[email&#160;protected]</a>.

SUPPLEMENTARY INFORMATION:

Comments Invited

The FAA invites you to send any written relevant data, views, or
arguments about this proposal. Send your comments to an address listed
under the ADDRESSES section. Include ``Docket No. FAA-2023-2151;
Project Identifier AD-2023-00984-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 again revise this proposal because of those comments.
Except for Confidential Business Information (CBI) as described in
the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to
<a href="http://regulations.gov">regulations.gov</a>, including any personal information you provide. The
agency will also post a report summarizing each substantive verbal
contact received about this proposed AD.

[[Page 77050]]

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 SNPRM 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 SNPRM, 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 SNPRM. Submissions containing CBI should
be sent to Luis Cortez-Muniz, Aviation Safety Engineer, FAA, 2200 South
216th St., Des Moines, WA 98198; phone: 206-231-3958; email:
<a href="/cdn-cgi/l/email-protection#8dc1f8e4fea3cca3cee2fff9e8f7a0c0f8e3e4f7cdebececa3eae2fb">[email&#160;protected]</a>. 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 issued an NPRM to amend 14 CFR part 39 by adding an AD that
would apply to all The Boeing Company Model 777-200, -200LR, -300, -
300ER, and 777F series airplanes. The NPRM published in the Federal
Register on November 17, 2023 (88 FR 80216). The NPRM was prompted by a
report of a 5-inch crack on the right wing upper wing skin at wing
station (WSTA) 460. In the NPRM, the FAA proposed to require repetitive
inspections for cracking of the upper wing skin common to certain
fasteners and applicable on-condition actions, including repair.

Actions Since the NPRM Was Issued

Since the FAA issued the NPRM, Boeing advised the FAA that there
have been two events of cracking at the fastener 6 and 7 locations
where the cracks initiated in the spanwise (inboard/outboard)
direction. These events were detected only because of a repair for an
adjacent fastener; the repaired fastener 6 and 7 locations were
subsequently inspected with an open hole HFEC inspection, and not with
the UT inspection. UT inspections can only detect cracking growth in a
particular direction if certain inspection procedures are performed.
The Model 777 non-destructive testing (NDT) procedures, which are
specified in Boeing Alert Requirements Bulletin 777-57A0125 RB, dated
July 25, 2023, include inspections for cracks initiating in the
chordwise (forward/aft) direction, which was how cracking was expected
to initiate based on Boeing analysis. A UT inspection at the fastener 6
and 7 locations would not have adequately detected the cracks found by
the open hole HFEC inspection. As a result, the existing inspections
will not provide a sufficient assessment of the structure before a
crack reaches critical length. An open hole HFEC inspection, however,
can detect cracking initiating from any direction.

Comments

The FAA received comments from two individuals who supported the
NPRM without change.
The FAA received additional comments from seven commenters,
including Air France, American Airlines, Air New Zealand, Boeing,
Etihad Airways, FedEx Express (FedEx), and United Airlines (United).
The following presents the comments received on the NPRM and the FAA's
response to each comment.

Request for Defined Repairs

Air France requested that a predefined preventive repair that
includes required parts and instructions be developed, approved by the
FAA, and provided as optional terminating action for the repetitive
inspections.
Air France also requested that a permanent repair be developed. The
commenter is concerned with the difficulty of anticipating the repair
process and unscheduled aircraft ground time.
The FAA does not concur with this request because the agency has
not yet received a permanent repair procedure from Boeing. However, the
FAA will review and consider approval of repair procedures and issue an
alternative method of compliance (AMOC) if they are acceptable.

Requests for Extension of Repeat Inspection Interval

Air France requested that the repeat inspection interval for Groups
4 and 6 be increased based on the results of the initial inspections
and on the age of the airplane. Air France added that the intervals are
shorter than the interval of appropriate maintenance checks for some
operators.
FedEx requested that less-frequent inspections be permitted because
Boeing Alert Requirements Bulletin 777-57A0125 RB, dated July 25, 2023,
does not account for the average mission length, which FedEx asserted
is a dominant factor. FedEx stated that Boeing analysis indicated that
crack initiation on high gross weight airplanes with an average mission
length of six flight hours per flight cycle is not expected to occur
until a significantly higher number of flight cycles than on an
airplane with an average mission length of eight flight hours per
flight cycle. FedEx stated that excessively conservative inspection
intervals will increase the probability of unnecessary removal of
fasteners due to false indications, creating an added risk of
incidental damage. FedEx proposed revised compliance times for
airplanes with an average mission length of six flight hours per flight
cycle.
The FAA does not concur with the request to extend the repeat
inspection interval required by this proposed AD. The FAA notes that
the commenters did not provide sufficient supporting data and analysis
to show that revised inspection intervals would provide an adequate
level of safety. Further, the analysis FedEx mentioned was an informal
analysis from 2023 before most operators began performing the required
inspections. Since that analysis, there have been numerous additional
findings, including some on airplanes with an average mission length of
less than six flight hours per flight cycle. However, the FAA may
consider changes in the compliance time provided that sufficient data
is submitted in the future and in accordance with paragraph (i) of this
proposed AD.

Request for Corrections to NDT Manual Sections

American Airlines requested corrections to several discrepancies in
the 777 NDT Manual Part 4, sections 57-20-13 and 57-20-14, which
provide ultrasonic inspection procedures. For section 57-20-13,
American Airlines coordinated with Boeing to correct issues in the NDT
procedure. American Airlines added that in Section 57-20-14, the figure
was oriented incorrectly. American Airlines provided images of how the
figure should be illustrated.
The FAA agrees with the corrections requested by American Airlines.
The FAA contacted Boeing to review changes planned in a later revision
of 777 NDT Manual Part 4, sections 57-20-13 and 57-20-14. These
revisions have since been released as 777 NDT Manual Part 4, Temporary
Revisions 04-64 and 04-65, both dated March 30, 2024. The temporary
revisions correct the necessary changes requested by the commenter.
However, the inspection instructions are unchanged. It would not result
in an unsafe condition if an operator were to follow a previous

[[Page 77051]]

revision; therefore, no changes are necessary in this proposed AD.

Requests To Clarify Terminating Action

United requested that paragraph (i) of the proposed AD be amended
to clarify that only a permanent repair will be considered a
terminating action for the repetitive inspection on the repaired wing.
United added that since there is no defined repair in the requirements
bulletin at this time, the requirement of the repair note in note (a)
of Boeing Alert Requirements Bulletin 777-57A0125 RB, dated July 25,
2023, and paragraph (i) of the proposed AD is unclear. United also
requested clarification of the terminating action based on Boeing Alert
Requirements Bulletin 777-57A0125 RB, dated July 25, 2023, which states
that repair for any crack found on the (left or right) wing is
terminating action to the repeat inspections ``for the affected wing
only,'' compared to paragraph (i) of the proposed AD, which stated that
a repair terminates the inspections ``at the repaired location only.''
Air New Zealand (ANZ) requested greater clarification of paragraph
(i) of the proposed AD. ANZ has inspected one airplane (applicable to
Group 4 effectivity) and found a crack on the left wing. ANZ had a
repair completed to a single fastener location, although six additional
fasteners in the inspection area of the repair were also replaced at
that time. ANZ noted that the repair instructions include inspection
times that are different than those specified in the service
information for fasteners that are inspected without a crack finding.
ANZ believed the terminating action statement in the proposed AD
referred to the repaired fastener only, and not the other fastener
locations identified in the service information.
Etihad Airways requested that paragraphs (i) and (j) of the
proposed AD be amended to state that only permanent repairs terminate
the repetitive inspections required by paragraph (g) of the proposed
AD. Etihad Airways noted that it had two airplanes with crack findings,
which were temporarily repaired under FAA Form 8100-9 with statements
that the repairs are Category C and must be replaced by a Category A or
B repair within a certain time limit, and do not terminate the repeat
inspection requirements of the service information.
The FAA partially agrees with the requests to amend paragraph (i)
of the proposed AD for clarity. The affected area is the area covered
by the repair. If a crack was found at one fastener location and the
subject repair extends to additional fasteners, the affected repair
area would include the initial cracked fastener location and the
additional fasteners that are now within the repair. Follow-on repair
inspections would affect the repair region. Areas outside of the repair
would still be subject to the repetitive inspection requirements of
paragraph (g) of this proposed AD. However, the FAA disagrees with the
need to distinguish between temporary repairs and permanent repairs for
terminating action because AMOC approvals are required for all
temporary repairs and permanent repairs. Additionally, the FAA
acknowledges that paragraph (i) that was in the proposed AD is not
necessary, as Boeing Alert Requirements Bulletin 777-57A0125 RB, dated
July 25, 2023, does not specify any standard repairs. Therefore, the
FAA has removed paragraph (i) of the proposed AD and added an exception
in paragraph (h)(3) of this proposed AD to clarify the requirements of
the terminating action.

Request To Allow Certain Temporary Repairs as AMOCs

Etihad Airways requested that the proposed AD be revised to allow
previously performed repairs approved under FAA Form 8100-9 that
require continued inspections in the repaired area be approved as AMOCs
to paragraph (g) of the proposed AD. The commenter noted that it had
temporary repairs that do not terminate repeat inspections but are
considered deviations to the inspection requirements.
The FAA agrees to clarify. AMOCs cannot be issued against proposed
ADs. Any repairs, whether temporary or permanent, must be accomplished
as specified in paragraph (h)(2) of this proposed AD. The provisions
specified in paragraph (h)(3) of this proposed AD would then also apply
to that repair.

Request for Change to Applicability

Boeing requested amending paragraph (c), ``Applicability,'' of the
proposed AD to reflect the specific minor models of the 777 that are
affected by the unsafe condition. Boeing noted that the proposed AD
listed all of the Boeing Model 777 airplanes without aligning with the
applicability of the requirements bulletin.
The FAA agrees with the request. Paragraph (c) of this proposed AD
has been revised to reflect the requested change.

Requests for Alternative Part Number Options

United requested that alternative part number options be approved
and communicated to operators to allow the inspections to be completed
within the required time frame. United explained that certain parts
within kits, required for inspection tasks for airplanes in groups 3
through 6, are not readily available from Boeing.
Air France reported that Boeing is unable to support the global
need for parts, which would be a significant operational strain.
Operators are obliged to work with very limited kits and support the
high number of airplanes to be inspected. Air France suggested approval
of a list of alternative parts that are readily available.
The FAA acknowledges the concerns regarding the parts not being
readily available from Boeing. However, the FAA has not yet received an
alternative part request from Boeing. The FAA will consider the
approval of alternative parts or an extended compliance time in
accordance with the procedures specified in paragraph (i) of this
proposed AD, provided sufficient substantiation is provided to show an
acceptable level of safety is maintained. The FAA has not changed this
proposed AD as a result of these comments.

FAA's Determination

The FAA is proposing this AD after determining the unsafe condition
described previously is likely to exist or develop in other products of
the same type design. Certain changes described above expand the scope
of the NPRM. As a result, it is necessary to reopen the comment period
to provide additional opportunity for the public to comment on this
SNPRM.

Material Incorporated by Reference Under 1 CFR Part 51

The FAA reviewed Boeing Alert Requirements Bulletin 777-57A0125 RB,
dated July 25, 2023. This material specifies procedures for repetitive
inspections for cracking of the upper wing skin common to certain
fasteners and applicable on-condition actions. On-condition actions
include repair.
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 the ADDRESSES section.

Proposed AD Requirements in This SNPRM

This proposed AD would require accomplishing the actions specified
in the material already described, except as discussed under
``Differences Between this Proposed AD and the Referenced Material,''
and except for any differences identified as exceptions in the
regulatory text of this proposed AD.

[[Page 77052]]

For information on the procedures and compliance times, see this
material at <a href="http://regulations.gov">regulations.gov</a> by searching for and locating Docket No.
FAA-2023-2151.

Difference Between This Proposed AD and the Referenced Material

For certain conditions, Boeing Requirements Bulletin 777-57A0125
RB, dated July 25, 2023, specifies UT inspections. For the reasons
explained under ``Actions Since the NPRM was Issued,'' this proposed AD
would require open hole HFEC inspections instead of UT inspections for
those conditions, as specified in paragraphs (h)(4) through (7) of this
proposed AD.

Costs of Compliance

The FAA estimates that this AD, if adopted as proposed, would
affect 323 airplanes of U.S. registry. The FAA estimates the following
costs to comply with this proposed AD:

Estimated Costs
----------------------------------------------------------------------------------------------------------------
Action Labor cost Parts cost Cost per product Cost on U.S. operators
----------------------------------------------------------------------------------------------------------------
Inspections................. 40 work-hours x $85 * $1,480 $4,880 per inspection $1,576,240 per
per hour = $3,400 per cycle. inspection cycle.
inspection cycle.
----------------------------------------------------------------------------------------------------------------
* An inspection kit is required.

The FAA has received no definitive data on which to base the cost
estimates for the on-condition repairs specified in this proposed AD.
The FAA has included all known costs in its cost estimate.
According to the manufacturer, however, some or all of the costs of
this proposed AD may be covered under warranty, thereby reducing the
cost impact on affected operators.

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-2023-2151; Project Identifier AD-
2023-00984-T.

(a) Comments Due Date

The FAA must receive comments on this airworthiness directive
(AD) by November 4, 2024.

(b) Affected ADs

None.

This AD applies to all The Boeing Company Model 777-200, -200LR,
-300, -300ER, and 777F series airplanes, certificated in any
category.

(d) Subject

Air Transport Association (ATA) of America Code 57, Wings.

(e) Unsafe Condition

This AD was prompted by a report of a 5-inch crack on the right
wing upper wing skin at wing station (WSTA) 460. The FAA is issuing
this AD to address the possibility of an undetected upper wing skin
crack. The unsafe condition, if not addressed, could result in the
inability of the primary structural element to sustain limit load
and could adversely affect the structural integrity of the airplane,
resulting in loss of control of the airplane.

(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
Alert Requirements Bulletin 777-57A0125 RB, dated July 25, 2023, do
all applicable actions identified in, and in accordance with, the
Accomplishment Instructions of Boeing Alert Requirements Bulletin
777-57A0125 RB, dated July 25, 2023.
Note 1 to paragraph (g): Guidance for accomplishing the actions
required by this AD can be found in Boeing Alert Service Bulletin
777-57A0125, dated July 25, 2023, which is referred to in Boeing
Alert Requirements Bulletin 777-57A0125 RB, dated July 25, 2023.

(h) Exceptions to Service Information Specifications

(1) Where Boeing Alert Requirements Bulletin 777-57A0125 RB,
dated July 25, 2023, uses the phrase ``the original issue date of
Requirements Bulletin 777-57A0125 RB,'' this AD requires using the
effective date of this AD.
(2) Where Boeing Alert Requirements Bulletin 777-57A0125 RB,
dated July 25, 2023, specifies contacting Boeing for repair
instructions: This AD requires doing the repair before further
flight using a method approved in accordance with the procedures
specified in paragraph (i) of this AD.
(3) Where note (a) of the tables in the ``Compliance'' paragraph
and Accomplishment Instructions of Boeing Alert Requirements
Bulletin 777-57A0125 RB, dated July 25, 2023, specifies that a
``repair

[[Page 77053]]

for any crack found on the left wing is terminating action to the
repeat inspection on the left wing only,'' or that a ``repair for
any crack found on the right wing is terminating action to the
repeat inspection on the right wing only,'' for this AD, performing
a repair for any crack in accordance with the procedures specified
in paragraph (i) of this AD terminates the repetitive inspections
required by (g) of this AD at the repaired area only.
(4) For Model 777-300 (Group 3) airplanes, where Boeing Alert
Requirements Bulletin 777-57A0125 RB, dated July 25, 2023, specifies
an ultrasonic (UT) inspection of the upper wing skin common to
fasteners 11 and 12, this AD requires an open hole high frequency
eddy current (HFEC) inspection of fasteners 11 and 12 in accordance
with Figures 5 and 6 (for the left wing) or Figures 18 and 19 (for
the right wing), as applicable.
(5) For Model 777-300ER (Group 4) airplanes, where Boeing Alert
Requirements Bulletin 777-57A0125 RB, dated July 25, 2023, requires
a UT inspection of the upper wing skin common to fasteners 6 and 7,
this AD requires an open hole HFEC inspection of fasteners 6 and 7
in accordance with Figures 30 and 34 (for the left wing) or Figures
39 and 43 (for the right wing), as applicable.
(6) For Model 777-200LR (Group 5) airplanes, where Boeing Alert
Requirements Bulletin 777-57A0125 RB, dated July 25, 2023, requires
a UT inspection of the upper wing skin common to fasteners 6 and 7,
this AD requires an open hole HFEC inspection of fasteners 6 and 7
in accordance with Figures 30 and 34 (for the left wing) or Figures
39 and 43 (for the right wing), as applicable.
(7) For Model 777F (Group 6) airplanes, where Boeing Alert
Requirements Bulletin 777-57A0125 RB, dated July 25, 2023, requires
a UT inspection of the upper wing skin common to fasteners 6 and 7,
this AD requires an open hole HFEC inspection of fasteners 6 and 7
in accordance with Figures 30 and 34 (for the left wing) or Figures
39 and 43 (for the right wing), as applicable.

(i) 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
(j)(1) of this AD. Information may be emailed to: <a href="/cdn-cgi/l/email-protection#86c7cbc9c5c6e0e7e7a8e1e9f0">[email&#160;protected]</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, 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.

(j) 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; phone: 206-231-3958; email: <a href="/cdn-cgi/l/email-protection#4a063f2339640b640925383e2f3067073f2423300a2c2b2b642d253c">[email&#160;protected]</a>.
(2) Material identified in this AD that is not incorporated by
reference is available at the address specified in paragraph (k)(3)
this AD.

(k) 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 the AD specifies otherwise.
(i) Boeing Alert Requirements Bulletin 777-57A0125 RB, dated
July 25, 2023.
(ii) [Reserved]
(3) For the 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 <a href="http://myboeingfleet.com">myboeingfleet.com</a>.
(4) 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.
(5) You may view this material at the National Archives and
Records Administration (NARA). For information on the availability
of this material at NARA, <a href="/cdn-cgi/l/email-protection#e08692ce898e9390858394898f8ea08e819281ce878f96">[email&#160;protected]</a>, or go to:
<a href="http://www.archives.gov/federal-register/cfr/ibr-locations.html">www.archives.gov/federal-register/cfr/ibr-locations.html</a>.

Issued on September 12, 2024.
Suzanne Masterson,
Deputy Director, Integrated Certificate Management Division, Aircraft
Certification Service.
[FR Doc. 2024-21211 Filed 9-19-24; 8:45 am]
BILLING CODE 4910-13-P

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