Proposed Rule2023-24306
Airworthiness Directives; The Boeing Company Airplanes
Primary source
Metadata and text below are from the Federal Register, a public-domain U.S. government work. Always verify the official published version before relying on it for any legal matter.
Published
December 12, 2023
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA proposes to supersede Airworthiness Directive (AD) 2020-03-20, which applies to certain The Boeing Company Model MD-11, MD-11F, and 717-200 airplanes, all Model 737-8 and 737-9 airplanes, all Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes, certain Model 747-400 and 747-400F series airplanes, certain Model 757 and 767 airplanes, and all Model 777 airplanes. AD 2020-03-20 requires revising the existing airplane flight manual (AFM) to include a limitation to prohibit operations that require less than 0.3 required navigational performance (RNP) within a specified area for airplanes having a certain multi-mode receiver (MMR) with certain software installed. Since the FAA issued AD 2020-03-20, the agency received reports from Boeing of simultaneous MMR resets related to an error in calculating Coordinated Universal Time (UTC). This proposed AD would continue to require the actions in AD 2020-03-20 and would also require installing certain MMR operational software (OPS). The FAA is proposing this AD to address the unsafe condition on these products.
Full Text
<html>
<head>
<title>Federal Register, Volume 88 Issue 237 (Tuesday, December 12, 2023)</title>
</head>
<body><pre>
[Federal Register Volume 88, Number 237 (Tuesday, December 12, 2023)]
[Proposed Rules]
[Pages 86073-86080]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2023-24306]
[[Page 86073]]
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2023-1993; Project Identifier AD-2023-00129-T]
RIN 2120-AA64
Airworthiness Directives; The Boeing Company Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
-----------------------------------------------------------------------
SUMMARY: The FAA proposes to supersede Airworthiness Directive (AD)
2020-03-20, which applies to certain The Boeing Company Model MD-11,
MD-11F, and 717-200 airplanes, all Model 737-8 and 737-9 airplanes, all
Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes,
certain Model 747-400 and 747-400F series airplanes, certain Model 757
and 767 airplanes, and all Model 777 airplanes. AD 2020-03-20 requires
revising the existing airplane flight manual (AFM) to include a
limitation to prohibit operations that require less than 0.3 required
navigational performance (RNP) within a specified area for airplanes
having a certain multi-mode receiver (MMR) with certain software
installed. Since the FAA issued AD 2020-03-20, the agency received
reports from Boeing of simultaneous MMR resets related to an error in
calculating Coordinated Universal Time (UTC). This proposed AD would
continue to require the actions in AD 2020-03-20 and would also require
installing certain MMR operational software (OPS). The FAA is proposing
this AD to address the unsafe condition on these products.
DATES: The FAA must receive comments on this proposed AD by January 26,
2024.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
<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-2023-1993; 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 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 service information at the FAA,
Airworthiness Products Section, Operational Safety Branch, 2200 South
216th St., Des Moines, WA. For information on the availability of this
material at the FAA, call 206-231-3195. It is also available at
<a href="http://regulations.gov">regulations.gov</a> by searching for and locating Docket No. FAA-2023-1993.
FOR FURTHER INFORMATION CONTACT: Jeffrey W. Palmer, Aviation Safety
Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 562-
627-5351; <a href="/cdn-cgi/l/email-protection#82e8e7e4e4f0e7fbacf5acf2e3eeefe7f0c2e4e3e3ace5edf4"><span class="__cf_email__" data-cfemail="8fe5eae9e9fdeaf6a1f8a1ffeee3e2eafdcfe9eeeea1e8e0f9">[email protected]</span></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-2023-1993; Project Identifier
AD-2023-00129-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
the 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.
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
Jeffrey W. Palmer, Aviation Safety Engineer, FAA, 2200 South 216th St.,
Des Moines, WA 98198; phone: 562-627-5351; <a href="/cdn-cgi/l/email-protection#f69c93909084938fd881d886979a9b9384b6909797d8919980"><span class="__cf_email__" data-cfemail="066c63606074637f28712876676a6b63744660676728616970">[email protected]</span></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 2020-03-20, Amendment 39-19844 (85 FR 8717,
February 18, 2020) (AD 2020-03-20), for The Boeing Company Model MD-11
and MD-11F airplanes modified by supplemental type certificate (STC)
ST01895WI; Model 717-200 airplanes modified by STC ST04416AT; all Model
737-8 and 737-9 airplanes; all Model 737-600, -700, -700C, -800, -900,
and -900ER series airplanes; Model 747-400 and 747-400F series
airplanes modified by STC ST01892WI; Model 757-200, -200PF, -200CB, and
-300 series airplanes modified by STC ST04436AT; Model 767-200, -300, -
300F, -400ER, and -2C series airplanes modified by STC ST04436AT or
ST01883WI; and all Model 777-200, -200LR, -300, -300ER, and 777F series
airplanes.
AD 2020-03-20 was prompted by reports of the loss of global
positioning system (GPS) data or degraded GPS positional accuracy while
using a certain MMR with certain Collins MMR software installed. When
an airplane is within a specific geographic region, the software is
failing to map the computed ionospheric pierce point to the correct
hemisphere. As a result, AD 2020-03-20 requires airplanes with a
certain MMR with certain software installed to revise the existing AFM
to include a limitation to prohibit operations that require less than
0.3 RNP within the specified geographic area. The agency issued AD
2020-03-20 to address the loss of GPS data and degraded GPS positional
accuracy, which, during a high-precision approach with this GPS error,
could result in controlled flight into terrain.
[[Page 86074]]
Actions Since AD 2020-03-20 Was Issued
Since the FAA issued AD 2020-03-20, the FAA received reports from
Boeing indicating there is an MMR software error that results in an MMR
reset after a leap-second, which is occasionally applied to UTC. If the
software calculation error occurs on all MMRs that are powered on at
that time, there could be simultaneous loss of all MMR-based functions
on all affected airplanes. If an affected airplane is in flight phase
when this calculation error occurs, the loss of all MMR functions would
result in increased flightcrew workload, as the flightcrew would reduce
automation and switch to operating under visual flight rules, which
requires contacting air traffic control (ATC) for direction and
support. In the event of multiple airplanes simultaneously experiencing
loss of MMR function in instrument meteorological conditions during
landing or takeoff, this would result in increased ATC workload and
consequent reduction in airplane spacing, which could result in a mid-
air collision.
In addition, Boeing has developed new software that addresses both
the unsafe condition identified in AD 2020-03-20 (software that fails
to map the computed ionospheric pierce point to the correct hemisphere)
and the additional unsafe condition identified in this proposed AD
(software error that results in an MMR reset after a leap-second).
Installing the new software would eliminate the need for the AFM
revision required by AD 2020-03-20.
FAA's Determination
The FAA is issuing this NPRM after determining that the unsafe
conditions described previously are likely to exist or develop on other
products of the same type design.
Related Service Information Under 1 CFR Part 51
The FAA reviewed the following Boeing requirements bulletins:
<bullet> Boeing Alert Requirements Bulletin 737-34A3572 RB, dated
October 15, 2020.
<bullet> Boeing Alert Requirements Bulletin 737-34A3573 RB, dated
August 5, 2020.
<bullet> Boeing Alert Requirements Bulletin 777-34A0385 RB,
Revision 1, dated March 8, 2021.
This service information specifies procedures for installation of
MMR OPS part number (P/N) COL4C-0087-0003 (or later-approved software
P/N) in MMR 1 and MMR 2, installation of MMR option selection software
(OSS) P/N BCG27-U000-0730 or BCG48-U000-05W9, and software
configuration checks. This service information also specifies taking
concurrent actions, including replacement of MMRs, replacement of GPS
antennas, and installation of additional software.
These documents are distinct since they apply to different airplane
models and configurations. 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 the
ADDRESSES section.
Proposed AD Requirements in This NPRM
This proposed AD would retain all requirements of AD 2020-03-20.
This proposed AD would also require accomplishing the actions specified
in the service information described previously, except as discussed
under ``Differences Between this Proposed AD and the Service
Information.'' For information on the procedures and compliance times,
see this service information at <a href="http://regulations.gov">regulations.gov</a> by searching for and
locating Docket No. FAA-2023-1993. For airplanes for which the service
information is not applicable, this proposed AD would require
installing MMR OPS P/N COL4C-0087-0003 (or later-approved software
version) and conducting a software configuration check, both of which
must be done in accordance with a method approved by the Manager, AIR-
520, Continued Operational Safety Branch, FAA.
Differences Between This Proposed AD and the Service Information
Where the service information specifies installing MMR OSS P/N
BCG27-U000-0730 or BCG48-U000-05W9, this proposed AD would not require
that action. Those MMR OSS part numbers are not used to calculate
position nor time functions; therefore, the installation of those MMR
OSS part numbers is not required for addressing the unsafe condition.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 409 airplanes of U.S. registry. The FAA estimates the following
costs to comply with this proposed AD:
Estimated Costs
----------------------------------------------------------------------------------------------------------------
Cost per Cost on U.S.
Action Labor cost Parts cost product operators
----------------------------------------------------------------------------------------------------------------
AFM revision (retained action from 1 work-hour x $85 per $0 $85 $34,765.
AD 2020[dash]03[dash]20). hour = $85.
Software installation and check 2 work-hours x $85 265 435 $177,915.
(new proposed action). per hour = $170.
Concurrent actions................ 5 work-hours x $85 = 795 1,220 Up to $498,980.*
$425.
----------------------------------------------------------------------------------------------------------------
* Not all airplanes would be required to do the concurrent actions. However, the FAA does not have an estimate
of how many airplanes are in a configuration that would require concurrent actions.
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 has determined that this proposed AD would not have
federalism implications under Executive Order
[[Page 86075]]
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 that the 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 (AD) 2020-03-20, Amendment 39-19844
(85 FR 8717, February 18, 2020), and
0
b. Adding the following new AD:
The Boeing Company: Docket No. FAA-2023-1993; Project Identifier AD-
2023-00129-T.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by January 26, 2024.
(b) Affected ADs
This AD replaces AD 2020-03-20, Amendment 39-19844 (85 FR 8717,
February 18, 2020) (AD 2020-03-20).
(c) Applicability
This AD applies to The Boeing Company airplanes, certificated in
any category, as identified in paragraphs (c)(1) through (9) of this
AD.
(1) Model MD-11 and MD-11F airplanes modified by supplemental
type certificate (STC) ST01895WI.
(2) Model 717-200 airplanes modified by STC ST04416AT.
(3) All Model 737-8 and 737-9 airplanes.
(4) All Model 737-600, -700, -700C, -800, -900, and -900ER
series airplanes.
(5) Model 747-400 and 747-400F series airplanes modified by STC
ST01892WI.
(6) Model 757-200, -200PF, -200CB, and -300 series airplanes
modified by STC ST04436AT.
(7) Model 767-200, -300, -300F, -400ER, and -2C series airplanes
modified by STC ST04436AT or ST01883WI.
(8) All Model 777-200, -200LR, -300, and -300ER series
airplanes.
(9) All Model 777F series airplanes.
(d) Subject
Air Transport Association (ATA) of America Code 34, Navigation.
(e) Unsafe Condition
This AD was prompted by reports of the loss of global
positioning system (GPS) data or degraded GPS positional accuracy
and additional reports of an error in calculating Coordinated
Universal Time (UTC) while using a certain multi-mode receiver (MMR)
with certain software installed. The FAA is issuing this AD to
address loss of GPS data and degraded GPS positional accuracy,
which, during a high-precision approach with this GPS error, could
result in controlled flight into terrain, and to address UTC
calculation errors that could result in simultaneous MMR resets on
multiple airplanes, increased air traffic control workload, and
consequent reduction in airplane separation and potential for mid-
air collision.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Retained Airplane Flight Manual (AFM) Revision, With No Changes
This paragraph restates the requirements of paragraph (g) of AD
2020-03-20, with no changes. For airplanes equipped with Collins
GLU-2100 MMR, part number (P/N) 822-2532-100, having any applicable
GLU-2100 operational software (OPS) identified in figure 1 to
paragraph (g) of this AD installed: At the applicable time specified
in paragraphs (g)(1) and (2) of this AD, revise the limitations or
certificate limitations section, as applicable, of the existing AFM
to include the information specified in figure 2 to paragraph (g) of
this AD and revise the procedures or normal procedures section, as
applicable, of the existing AFM to include the information specified
in figure 3 to paragraph (g) of this AD. This may be done by
inserting a copy of figures 2 and 3 to paragraph (g) of this AD into
the existing AFM.
(1) For Model 737-8 and 737-9 airplanes: Before further flight.
(2) For all airplanes except Model 737-8 and 737-9 airplanes:
Within 7 days after February 18, 2020 (the effective date of AD
2020-03-20).
BILLING CODE 4910-13-P
[[Page 86076]]
Figure 1 to Paragraph (g)--Affected OPS Software
[GRAPHIC] [TIFF OMITTED] TP12DE23.003
[[Page 86077]]
Figure 2 to Paragraph (g)--AFM--Limitations or Certificate Limitations
[GRAPHIC] [TIFF OMITTED] TP12DE23.004
[[Page 86078]]
Figure 2 to Paragraph (g)--AFM--Limitations or Certificate Limitations
Continued
[GRAPHIC] [TIFF OMITTED] TP12DE23.005
[[Page 86079]]
Figure 3 to Paragraph (g)--AFM--Procedures or Normal Procedures
[GRAPHIC] [TIFF OMITTED] TP12DE23.006
BILLING CODE 4910-13-C
(h) Software Installation for Certain Airplanes
For airplanes identified in paragraphs (h)(1) through (7) of
this AD: Within 12 months after the effective date of this AD,
install MMR OPS P/N COL4C-0087-0003, or later-approved software
version, and do a software configuration check to confirm that P/N
COL4C-0087-0003 or later-approved software version is installed.
Both the installation and the check must be done in accordance with
a method approved by the Manager, AIR-520, Continued Operational
Safety Branch, FAA. Later-approved software versions are those
Boeing software versions that are approved as a replacement for MMR
OPS P/N COL4C-0087-0003 and are approved as part of the type design
by the FAA or by The Boeing Company Organization Designation
Authorization (ODA).
(1) Model MD-11 and MD-11F airplanes modified by STC ST01895WI.
(2) Model 717-200 airplanes modified by STC ST04416AT.
(3) Model 737-600, -700, -700C, -800, and -900 series airplanes.
(4) Model 747-400 and 747-400F series airplanes modified by STC
ST01892WI.
(5) Model 757-200, -200PF, -200CB, and -300 series airplanes
modified by STC ST04436AT.
(6) Model 767-200, -300, -300F, -400ER, and -2C series airplanes
modified by STC ST04436AT or ST01883WI.
(7) Model 777-200, -200LR, and -300 series airplanes.
(i) Software Installation for Certain Other Airplanes
For Model 737-8 and -9 airplanes, Model 737-900ER series
airplanes, and Model 777-300ER and 777F series airplanes: Within 12
months after the effective date of this AD, except as specified in
paragraph (j) of this AD, do all applicable actions identified in,
and in accordance with, the Accomplishment Instructions of the
applicable requirements bulletin identified in paragraphs (i)(1)
through (3) of this AD.
(1) For Model 737-8 and -9 airplanes: Boeing Alert Requirements
Bulletin 737-34A3572 RB, dated October 15, 2020.
Note 1 to paragraph (i)(1): Guidance for accomplishing the
actions required by paragraph (i)(1) of this AD can be found in
Boeing Alert Service Bulletin 737-34A3572, dated October 15, 2020,
which is referred to in Boeing Alert Requirements Bulletin 737-
34A3572 RB, dated October 15, 2020.
(2) For Model 737-900ER series airplanes: Boeing Alert
Requirements Bulletin 737-34A3573 RB, dated August 5, 2020.
Note 2 to paragraph (i)(2): Guidance for accomplishing the
actions required by paragraph (i)(2) of this AD can be found in
Boeing Alert Service Bulletin 737-34A3573, dated August 5, 2020,
which is referred to in Boeing Alert Requirements Bulletin 737-
34A3573 RB, dated August 5, 2020.
(3) For Model 777-300ER and 777F series airplanes: Boeing Alert
Requirements Bulletin 777-34A0385 RB, Revision 1, dated March 8,
2021.
Note 3 to paragraph (i)(3): Guidance for accomplishing the
actions required by paragraph (i)(3) of this AD can be found in
Boeing Alert Service Bulletin 777-34A0385, Revision 1, dated March
8, 2021, which is referred to in Boeing Alert Requirements Bulletin
777-34A0385 RB, Revision 1, dated March 8, 2021.
(j) Exceptions to Service Information Specifications
Where the requirements bulletins identified in paragraphs (i)(1)
through (3) of this AD specify installing MMR option selection
software (OSS) P/N BCG27-U000-0730 or BCG48-U000-05W9 and doing the
associated software configuration check, this AD does not require
those actions.
(k) Terminating Action
After accomplishing the actions required by paragraph (h) or (i)
of this AD, as applicable, you may remove the AFM revision required
by paragraph (g) of this AD.
(l) Credit for Previous Actions
This paragraph provides credit for the actions required by
paragraph (i)(3) of this AD, if the actions were performed before
the effective date of this AD using Boeing Alert Requirements
Bulletin 777-34A0385 RB, dated August 7, 2020.
(m) 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
(n)(1) of this AD. Information may be emailed to: <a href="/cdn-cgi/l/email-protection#efd6c2aea1a2c2bc8a8e9b9b838ac2aeaca0c2aea2a0acc2bd8a9e9a8a9c9b9caf898e8ec1888099"><span class="__cf_email__" data-cfemail="70495d313e3d5d23151104041c155d31333f5d313d3f335d2215010515030403301611115e171f06">[email protected]</span></a>.
(2) Before using any approved AMOC, notify your appropriate
principal inspector, or lacking a principal inspector, the manager
of the responsible Flight Standards Office.
(3) An AMOC that provides an acceptable level of safety may be
used for any repair, modification, or alteration required by this AD
if it is approved by The Boeing Company 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.
(n) Related Information
(1) For more information about this AD, contact Jeffrey W.
Palmer, Aviation Safety Engineer, FAA, 2200 South 216th St., Des
Moines, WA 98198; phone: 562-627-5351; <a href="/cdn-cgi/l/email-protection#92f8f7f4f4e0f7ebbce5bce2f3fefff7e0d2f4f3f3bcf5fde4"><span class="__cf_email__" data-cfemail="036966656571667a2d742d73626f6e6671436562622d646c75">[email protected]</span></a>.
[[Page 86080]]
(2) Service information identified in this AD that is not
incorporated by reference is available at the addresses specified in
paragraphs (o)(3) and (4) of this AD.
(o) Material Incorporated by Reference
(1) The Director of the Federal Register approved the
incorporation by reference of the service information listed in this
paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) You must use this service information as applicable to do
the actions required by this AD, unless the AD specifies otherwise.
(i) Boeing Alert Requirements Bulletin 737-34A3572 RB, dated
October 15, 2020.
(ii) Boeing Alert Requirements Bulletin 737-34A3573 RB, dated
August 5, 2020.
(iii) Boeing Alert Requirements Bulletin 777-34A0385 RB,
Revision 1, dated March 8, 2021.
(3) For service information identified in this AD, contact
Boeing Commercial Airplanes, Attention: Contractual & Data Services
(C&DS), 2600 Westminster Blvd., MC 110-SK57, Seal Beach, CA 90740-
5600; telephone 562-797-1717; website <a href="http://myboeingfleet.com">myboeingfleet.com</a>.
(4) You may view this service information at the FAA,
Airworthiness Products Section, Operational Safety Branch, 2200
South 216th St., Des Moines, WA. For information on the availability
of this material at the FAA, call 206-231-3195.
(5) You may view this material at the National Archives and
Records Administration (NARA). For information on the availability
of this material at NARA, visit <a href="http://www.archives.gov/federal-register/cfr/ibr-locations">www.archives.gov/federal-register/cfr/ibr-locations</a> or email <a href="/cdn-cgi/l/email-protection#6b0d19450205181b0e081f0204052b050a190a450c041d"><span class="__cf_email__" data-cfemail="a0c6d28ec9ced3d0c5c3d4c9cfcee0cec1d2c18ec7cfd6">[email protected]</span></a>.
Issued on October 4, 2023.
Victor Wicklund,
Deputy Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2023-24306 Filed 12-11-23; 8:45 am]
BILLING CODE 4910-13-P
</pre><script data-cfasync="false" src="/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js"></script></body>
</html>Indexed from Federal Register on December 12, 2023.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.