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Proposed Rule2023-28153

Airworthiness Directives; The Boeing Company Airplanes

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Published

December 22, 2023

Issuing agencies

Transportation DepartmentFederal Aviation Administration

Abstract

The FAA proposes to adopt a new airworthiness directive (AD) for all The Boeing Company Model 787-8, 787-9, and 787-10 airplanes. This proposed AD was prompted by a report indicating that the oxygen supply tubing can become kinked when certain passenger service unit (PSU) oxygen panel assemblies are installed in the forward-most position of a center stow bin. This proposed AD would require a one- time inspection of the affected PSU oxygen panel assemblies 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

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<title>Federal Register, Volume 88 Issue 245 (Friday, December 22, 2023)</title>
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[Federal Register Volume 88, Number 245 (Friday, December 22, 2023)]
[Proposed Rules]
[Pages 88544-88546]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2023-28153]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2023-2398; Project Identifier AD-2023-00423-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 adopt a new airworthiness directive (AD)
for all The Boeing Company Model 787-8, 787-9, and 787-10 airplanes.
This proposed AD was prompted by a report indicating that the oxygen
supply tubing can become kinked when certain passenger service unit
(PSU) oxygen panel assemblies are installed in the forward-most
position of a center stow bin. This proposed AD would require a one-
time inspection of the affected PSU oxygen panel assemblies 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.

DATES: The FAA must receive comments on this proposed AD by February 5,
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-2023-2398; 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-2023-2398.

FOR FURTHER INFORMATION CONTACT: Samuel Nalbandian, Aviation Safety
Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone 206-
231-3993; email: <a href="/cdn-cgi/l/email-protection#4310222e36262f6d086d0d222f21222d272a222d032522226d242c35">[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-2023-2398; Project Identifier
AD-2023-00423-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
Samuel Nalbandian, Aviation Safety Engineer, FAA, 2200 South 216th St.,
Des Moines, WA 98198; phone: 206-231-3993; email:
<a href="/cdn-cgi/l/email-protection#5c0f3d31293930721772123d303e3d3238353d321c3a3d3d723b332a">[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 has received a report indicating that a pinching condition
may exist between the oxygen supply tube on the PSU oxygen panel and
the stowage bin end blade on affected PSU oxygen panel assemblies and
may result in the inability of the oxygen system to provide oxygen to
the airplane's passengers in a cabin depressurization event. The PSU
reverse bottle oxygen panel assembly drawing restructure introduced a
conflict between lower- and upper-level assembly drawings. After the
drawing restructure, the upper-level assembly drawings had corrected
routing design intent, but the lower-level assembly drawings had
incorrect routing definition. Installation of a PSU reverse bottle
oxygen panel assembly with incorrect routing can lead to a condition
where the oxygen supply tubing becomes kinked in the forward-most
position of a center stowage bin. Incorrect routing of the tubing, if
not addressed, could result in kinked tubing and consequent passengers'
injury because of a lack of supplemental oxygen during a cabin
depressurization event.

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.

Related Service Information Under 1 CFR Part 51

The FAA reviewed Boeing Alert Requirements Bulletins B787-81205-
SB250277-00 RB and B787-81205-SB250278-00 RB, both Issue 001, both
dated February 15, 2023. This service information specifies procedures
for verifying the identification label of the

[[Page 88545]]

oxygen panel assembly, doing a general visual inspection of the oxygen
supply tube and initiator cable assembly for correct installation, and
doing a general visual inspection for damage of the oxygen supply
tubing. The service information also specifies procedures for on-
condition actions: replacing the oxygen supply tubing, re-routing of
the oxygen supply tubing and initiator cable assembly, and re-
identifying equipment. These documents are distinct since they apply to
different airplanes. 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.

Proposed AD Requirements in This NPRM

This proposed AD would require accomplishing the actions specified
in the service information already described, except as discussed under
``Difference 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> by searching for and locating Docket No. FAA-2023-2398.

Difference Between This Proposed AD and the Service Information

The effectivity of Boeing Alert Requirements Bulletins B787-81205-
SB250277-00 RB and B787-81205-SB250278-00 RB, both Issue 001, both
dated February 15, 2023, is limited to Model 787-8, 787-9, and 787-10
airplanes having certain line numbers. However, the applicability of
this proposed AD includes all Model 787-8, 787-9, and 787-10 airplanes.
Because the affected PSU oxygen panel assemblies are rotatable parts,
the FAA has determined that these parts could later be installed on
airplanes that were initially delivered with acceptable parts, thereby
subjecting those airplanes to the unsafe condition. Therefore, Model
787-8, -9, and -10 airplanes not listed in the service information
would be subject only to the parts installation prohibition of this
proposed AD.

Costs of Compliance

The FAA estimates that this AD, if adopted as proposed, would
affect 19 airplanes of U.S. registry. The FAA estimates the following
costs to comply with this proposed AD:

Estimated Costs
----------------------------------------------------------------------------------------------------------------
Cost on U.S.
Action Labor cost Parts cost Cost per product operators
----------------------------------------------------------------------------------------------------------------
Inspections and rerouting........ Up to 25 work-hours $0 Up to $2,125........ Up to $40,375.
x $85 per hour = Up
to $2,125.
----------------------------------------------------------------------------------------------------------------

The FAA estimates the following costs to do any necessary on-
condition actions 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 the on-condition actions:

On-Condition Costs
----------------------------------------------------------------------------------------------------------------
Cost per
Action Labor cost Parts cost product
----------------------------------------------------------------------------------------------------------------
Replacement of oxygen supply tube............ Up to 9 work-hours x $85 per $30 $795
hour = Up to $765.
----------------------------------------------------------------------------------------------------------------

The FAA has included all known costs in its cost estimate.
According to the manufacturer, however, some or all 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.

[[Page 88546]]

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-2023-2398; Project Identifier AD-
2023-00423-T.

(a) Comments Due Date

The FAA must receive comments on this airworthiness directive
(AD) by February 5, 2024.

(b) Affected ADs

None.

This AD applies to all The Boeing Company Model 787-8, 787-9,
and 787-10 airplanes, certificated in any category.

(d) Subject

Air Transport Association (ATA) of America Code 35, Oxygen.

(e) Unsafe Condition

This AD was prompted by a report indicating that the oxygen
supply tubing can become kinked when certain passenger service unit
(PSU) oxygen panel assemblies are installed in the forward-most
position of a center stow bin. The FAA is issuing this AD to address
incorrect installation of the oxygen supply tubing in the PSU oxygen
panel assemblies. The unsafe condition, if not addressed, could
result in kinked tubing and consequent injury of the airplane's
passengers because of a lack of supplemental oxygen during a cabin
depressurization event.

(f) Compliance

Comply with this AD within the compliance times specified,
unless already done.

(g) Inspection of the Affected Parts

For airplanes identified in Boeing Alert Requirements Bulletins
B787-81205-SB250277-00 RB, Issue 001, dated February 15, 2023, and
B787-81205-SB250278-00 RB, Issue 001, dated February 15, 2023:
Except as specified by paragraph (h) of this AD: At the applicable
times specified in the ``Compliance'' paragraph of Boeing Alert
Requirements Bulletins B787-81205-SB250277-00 RB, Issue 001, dated
February 15, 2023, or B787-81205-SB250278-00 RB, Issue 001, dated
February 15, 2023, as applicable, do all applicable actions
identified in, and in accordance with, the Accomplishment
Instructions of Boeing Alert Requirements Bulletin B787-81205-
SB250277-00 RB, Issue 001, dated February 15, 2023, or B787-81205-
SB250278-00 RB, Issue 001, dated February 15, 2023, as applicable.

(h) Exceptions to Service Information Specifications

(1) Where the Compliance Time columns of the tables in the
``Compliance'' paragraph of Boeing Alert Requirements Bulletin B787-
81205-SB250277-00 RB, Issue 001, dated February 15, 2023, use the
phrase ``the Issue 001 date of the Requirements Bulletin B787-81205-
SB250277-00 RB,'' this AD requires using ``the effective date of
this AD.''
(2) Where the Compliance Time columns of the tables in the
``Compliance'' paragraph of Boeing Alert Requirements Bulletin B787-
81205-SB250278-00 RB, Issue 001, dated February 15, 2023, use the
phrase ``the Issue 001 date of the Requirements Bulletin B787-81205-
SB250278-00 RB'' this AD requires using ``the effective date of this
AD.''
(3) Where Boeing Alert Requirements Bulletin B787-81205-
SB250277-00 RB, Issue 001, dated February 15, 2023, and Boeing Alert
Requirements Bulletin B787-81205-SB250278-00 RB, Issue 001, dated
February 15, 2023, specify that the corrective actions for
Conditions 2, 2.2, 2.2.2, and 3 must be done before further flight,
this AD requires that the corrective actions for those conditions
must be done within 24 months after the effective date of this AD.

(i) Parts Installation Prohibition

As of the effective date of this AD, no person may install, on
any airplane, a PSU oxygen panel assembly part number 4572105-XXX-
0D0, or 4572175-XXX-0D0, or 4572185-XXX-0D0, where the ``XXX'' in
the affected PSU oxygen panel assembly part numbers is any
combination of numerals, that was manufactured in May 2020 or
before, and does not have a supplier service bulletin modification
label marked with an applicable supplier service bulletin number and
date.

(j) 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 (k)
of this AD. Information may be emailed to: <a href="/cdn-cgi/l/email-protection#6d54402c2320403e080c19190108402c2e22402c20222e403f081c18081e191e2d0b0c0c430a021b">[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.

(k) Related Information

For more information about this AD, contact Samuel Nalbandian,
Aviation Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA
98198; phone: 206-231-3993; email: <a href="/cdn-cgi/l/email-protection#82d1e3eff7e7eeacc9accce3eee0e3ece6ebe3ecc2e4e3e3ace5edf4">[email&#160;protected]</a>.

(l) 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.
(i) Boeing Alert Requirements Bulletin B787-81205-SB250277-00
RB, Issue 001, dated February 15, 2023.
(ii) Boeing Alert Requirements Bulletin B787-81205-SB250278-00
RB, Issue 001, dated February 15, 2023.
(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="/cdn-cgi/l/email-protection#5a663b7a32283f3c67" http: www.archives.gov federal-register cfr ibr-locationsoremailfr.inspection@nara.gov">www.archives.gov/federal-register/cfr/[email&#160;protected]</a>"><a href="http://www.archives.gov/federal-register/cfr/ibr-locationsoremailfr.inspection@nara.gov">www.archives.gov/federal-register/cfr/[email&#160;protected]</a></a>.

Issued on December 18, 2023.
Victor Wicklund,
Deputy Director, Compliance & Airworthiness Division, Aircraft
Certification Service.
[FR Doc. 2023-28153 Filed 12-21-23; 8:45 am]
BILLING CODE 4910-13-P

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