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Proposed Rule2023-11064

Airworthiness Directives; The Boeing Company Airplanes

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Published

May 25, 2023

Issuing agencies

Transportation DepartmentFederal Aviation Administration

Abstract

The FAA proposes to supersede Airworthiness Directive (AD) 2020-26-08 which applies to The Boeing Company Model 787-8, 787-9, and 787-10 airplanes powered by Rolls-Royce Trent 1000 engines. AD 2020-26- 08 requires 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, it was determined a new upper splitter fairing assembly is needed to prevent the damage to the fire seal and thermal insulation blanket. This proposed AD would continue to require the actions specified in AD 2020- 26-08 and would require 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 proposed AD would also prohibit the installation of affected parts. The FAA is proposing this AD to address the unsafe condition on these products.

Full Text

<html>
<head>
<title>Federal Register, Volume 88 Issue 101 (Thursday, May 25, 2023)</title>
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<body><pre>
[Federal Register Volume 88, Number 101 (Thursday, May 25, 2023)]
[Proposed Rules]
[Pages 33851-33855]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2023-11064]

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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]
RIN 2120-AA64

Airworthiness Directives; The Boeing Company Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: The FAA proposes to supersede Airworthiness Directive (AD)
2020-26-08 which applies to The Boeing Company Model 787-8, 787-9, and
787-10 airplanes powered by Rolls-Royce Trent 1000 engines. AD 2020-26-
08 requires 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, it was
determined a new upper splitter fairing assembly is needed to prevent
the damage to the fire seal and thermal insulation blanket. This
proposed AD would continue to require the actions specified in AD 2020-
26-08 and would require 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 proposed AD would also prohibit
the installation of

[[Page 33852]]

affected parts. The FAA is proposing this AD to address the unsafe
condition on these products.

DATES: The FAA must receive comments on this proposed AD by July 10,
2023.

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-2023-1037; 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 NPRM, any comments received, and other
information. The street address for Docket Operations is listed above.
Material Incorporated by Reference:
<bullet> For service information identified in this NPRM, 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> by searching for and locating Docket No. FAA-2023-1037.

FOR FURTHER INFORMATION CONTACT: Tak Kobayashi, Aerospace Engineer,
Propulsion Section, West Certification Branch, FAA, 3960 Paramount
Boulevard, Lakewood, CA 90712-4137; telephone: 206-231-3553; email:
<a href="/cdn-cgi/l/email-protection#f480959f959c9d8795da9f9b96958d95879c9db4929595da939b82">[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 ADDRESSES. Include ``Docket No. FAA-2023-1037; Project Identifier
AD-2023-00511-T'' at the beginning of your comments. The most helpful
comments reference a specific portion of the proposal, explain the
reason for any recommended change, and include supporting data. The FAA
will consider all comments received by the closing date and may amend
this proposal because of those comments.
Except for Confidential Business Information (CBI) as described in
the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to
<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 NPRM.

Confidential Business Information

CBI is commercial or financial information that is both customarily
and actually treated as private by its owner. Under the Freedom of
Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from public
disclosure. If your comments responsive to this NPRM contain commercial
or financial information that is customarily treated as private, that
you actually treat as private, and that is relevant or responsive to
this NPRM, it is important that you clearly designate the submitted
comments as CBI. Please mark each page of your submission containing
CBI as ``PROPIN.'' The FAA will treat such marked submissions as
confidential under the FOIA, and they will not be placed in the public
docket of this NPRM. Submissions containing CBI should be sent to Tak
Kobayashi, Aerospace Engineer, Propulsion Section, West Certification
Branch, FAA, 3960 Paramount Boulevard, Lakewood, CA 90712-4137;
telephone: 206-231-3553; email: <a href="/cdn-cgi/l/email-protection#a4d0c5cfc5cccdd7c58acfcbc6c5ddc5d7cccde4c2c5c58ac3cbd2">[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 AD 2020-26-08, Amendment 39-21363 (85 FR 83755,
December 23, 2020) (AD 2020-26-08), for The Boeing Company Model 787-8,
787-9, and 787-10 airplanes powered by Rolls-Royce Trent 1000 engines.
AD 2020-26-08 was prompted by reports of damage to the IFS forward
upper fire seal and damage to the thermal insulation blankets in the
forward upper area of the thrust reverser. AD 2020-26-08 requires
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 FAA issued AD 2020-26-08 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, which could lead to loss of airplane control.

Actions Since AD 2020-26-08 Was Issued

The preamble to AD 2020-26-08 specifies that the FAA considers that
AD ``interim action'' and that the FAA might consider further
rulemaking if a modification is developed, approved, and available. The
manufacturer has since developed such a modification (installation of
upper splitter fairing assembly part number KH99185), which would
terminate the repetitive inspections required by AD 2020-26-08. The FAA
has determined that this modification should be required.
AD 2020-26-08 specifies doing actions in accordance with Boeing
Alert Requirements Bulletin B787-81205-SB780041-00 RB, Issue 001, dated
March 31, 2020. Boeing has since issued Boeing Alert Requirements
Bulletin B787-81205-SB780041-00, Issue 002, dated December 21, 2021.
Issue 002 adds two variable numbers to the effectivity that were
missing in Issue 001; however, Issue 002 does not change the procedures
in the Accomplishment Instructions or the compliance times. The FAA has
added Boeing Alert Requirements Bulletin B787-81205-SB780041-00, Issue
002, dated December 21, 2021, as an optional method of compliance to
paragraph (g) of this proposed AD.

FAA's Determination

The FAA is issuing this NPRM after determining that the unsafe
condition described previously is likely to exist or develop on other
products of the same type design.

[[Page 33853]]

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 procedures for replacing the upper splitter
fairing assembly with a new upper splitter fairing assembly with ramp
fairing incorporated, 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, and applicable on-condition actions.
On-condition actions include replacing the IFS forward upper fire seal
and thermal insulation blanket of each TR half if damage is found.
Those procedures in the service information apply to each affected
engine.
The FAA also reviewed Boeing Alert Requirements Bulletin B787-
81205-SB780041-00, Issue 002, dated December 21, 2021. The service
information describes 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, and applicable on-condition actions.
On-condition actions include replacing the IFS forward upper fire seal
and thermal insulation blanket of each TR half if damage is found.
Those procedures in the service information apply to each affected
engine.
This proposed AD would also require 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 section.

Proposed AD Requirements in This NPRM

This proposed AD would retain all requirements of AD 2020-26-08.
Accomplishing the new actions proposed in this AD would terminate the
requirements of AD 2020-26-08.
This proposed AD would require accomplishing the actions specified
in the service information already described, except as discussed under
``Differences Between this Proposed AD and the Service Information''
and except for any differences identified as exceptions in the
regulatory text of this proposed AD. This proposed AD would also
prohibit the installation of affected parts. For information on the
procedures and compliance times, see this service information at
<a href="http://regulations.gov">regulations.gov</a> under Docket No. FAA-2023-1037.

Differences Between This Proposed AD and the Service Information

The effectivity of Boeing Alert Requirements Bulletin B787-81205-
SB720007-00 RB, Issue 001, dated December 12, 2022, is limited to Model
787-8, -9 and -10 airplanes having certain line numbers. However, the
applicability of this proposed AD includes all Boeing Model 787-7, -8,
and -9 airplanes with Rolls-Royce Trent 1000 engines installed. Because
the affected upper splitter fairing assembly are rotable parts, the FAA
has determined that these parts could later be installed on airplanes
that were initially delivered with acceptable upper splitter fairing
assembly, thereby subjecting those airplanes to the unsafe condition.
The FAA has determined that the Accomplishment Instructions in Boeing
Alert Requirements Bulletin B787-81205-SB720007-00 RB, Issue 001, dated
December 12, 2022, can be applied to airplanes outside the effectivity
of the service information if an affected part is installed on those
airplanes. This proposed AD includes an inspection or records review to
determine if an affected part is installed.

Costs of Compliance

The FAA estimates that this AD, if adopted as proposed, would
affect 13 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
----------------------------------------------------------------------------------------------------------------
Inspection (retained actions 2 work-hours x $0 $170 per $2,210 per inspection cycle.
from AD 2020-26-08). $85 per hour = inspection
$170 per cycle.
inspection
cycle.
Inspection or records review 1 work-hour x 0 $85............. $1,105.
(new proposed 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 proposed action). $6,035.
Inspection (new proposed 2 work-hours x 0 $170............ $2,210.
action). $85 per hour =
$170.
----------------------------------------------------------------------------------------------------------------

The FAA estimates the following costs to do any necessary
replacements that would be required based on the results of the
proposed 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 $85 per $1,383 per TR half..... $1,553 per TR half (4
hour = $170 per TR TR halves per
half. airplane).
Thermal insulation blanket 1 work-hour x $85 per $18,214 per TR half.... $18,299 per TR half.
replacement. hour = $85 per TR half.
----------------------------------------------------------------------------------------------------------------

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.

[[Page 33854]]

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

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:
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:

The Boeing Company: Docket No. FAA-2023-1037; Project Identifier AD-
2023-00511-T.

(a) Comments Due Date

The FAA must receive comments on this airworthiness directive
(AD) by July 10, 2023.

(b) Affected ADs

This AD replaces AD 2020-26-08, Amendment 39-21363 (85 FR 83755,
December 23, 2020) (AD 2020-26-08).

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 New Service Information and Revised Affected
Airplanes

This paragraph restates the requirements of paragraph (g) of AD
2020-26-08, with new service information and revised affected
airplanes. 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 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, 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, 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, Issue 002, dated
December 21, 2021.

(h) Retained Exceptions to Service Information Specifications in
Paragraph (g) of This AD, With Added Reference to New Service
Information

This paragraph restates the exceptions specified in paragraph
(h) of AD 2020-26-08, with added reference to new 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, 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 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 after the date of issuance of the
original airworthiness certificate or original export certificate of
airworthiness, whichever occurs later, inspect 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 was found during the inspection, the actions required
by paragraph (g) of this AD are no longer required for that engine.

[[Page 33855]]

(2) If, during any inspection or records review required by
paragraph (i)(1) of this AD, an upper splitter fairing assembly P/N
KH60375 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 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

Where the ``Effectivity'' paragraph and the Condition and
Compliance Time columns of the tables in the ``Compliance''
paragraph of Boeing Alert Requirements Bulletin B787-81205-SB720007-
00 RB, Issue 001, dated December 12, 2022, use the phrase ``the
original issue date of Requirements Bulletin B787-81205-SB720007-00
RB,'' this AD requires using ``the effective date of this AD.''

(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 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: At the applicable time specified in paragraph
(k)(2)(i) or (ii) of this AD, no person may install an engine with
an upper splitter fairing assembly P/N KH60375 on any airplane.
(i) For airplanes on which no upper splitter fairing assembly P/
N KH60375 was found during the inspection required by paragraph
(i)(1) of this AD: After accomplishing the inspection required by
paragraph (i)(1) of this AD.
(ii) For airplanes on which an upper splitter fairing assembly
P/N KH60375 was found during the inspection required by paragraph
(i)(1) of this AD: At the applicable time specified in paragraph
(k)(2)(ii)(A) or (B) of this AD.
(A) For an engine on which an upper splitter fairing assembly P/
N KH60375 was not found: After accomplishing the inspection required
by paragraph (i)(1) of this AD.
(B) For an engine on which an upper splitter fairing assembly P/
N KH60375 was found: After replacing an affected upper splitter
fairing assembly part number with a new upper splitter fairing
assembly part number for that engine as required by paragraph (i)(2)
of this AD.

(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 the certification office,
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#8db4a0ccc3c0a0dee8ecf9f9e1e8a0cccec2a0ccc0c2cea0dfe8fcf8e8fef9fecdebececa3eae2fb">[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.

(m) Related Information

For more information about this AD, contact Tak Kobayashi,
Aerospace Engineer, Propulsion Section, West Certification Branch,
FAA, 3960 Paramount Boulevard, Lakewood, CA 90712-4137; telephone:
206-231-3553; email: <a href="/cdn-cgi/l/email-protection#fd899c969c95948e9cd396929f9c849c8e9594bd9b9c9cd39a928b">[email&#160;protected]</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 the AD specifies otherwise.
(3) The following service information was approved for IBR on
[DATE 35 DAYS AFTER PUBLICATION OF THE FINAL RULE].
(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,
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 service information that is incorporated
by reference 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#5f392d7136312c2f3a3c2b3630311f313e2d3e71383029">[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 May 8, 2023.
Gaetano A. Sciortino,
Acting Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2023-11064 Filed 5-24-23; 8:45 am]
BILLING CODE 4910-13-P

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Indexed from Federal Register on May 25, 2023.

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