88544 Federal Register / Vol. 88, No. 245 / Friday, December 22, 2023 / Proposed Rules 

Issued on December 14, 2023. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2023–28003 Filed 12–21–23; 8:45 am] 

BILLING CODE 4910–13–P 

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). 

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: 

• Federal eRulemaking Portal: Go to 

regulations.gov. Follow the instructions 

for submitting comments. 

• Fax: 202–493–2251. 

• 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. 

• 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 regulations.gov 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: 

• 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 

myboeingfleet.com. 

• 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 

regulations.gov 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: 

Samuel.K.Nalbandian@faa.gov. 

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 

regulations.gov, 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: 

Samuel.K.Nalbandian@faa.gov. 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 lowerand 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 


ddrumheller on DSK120RN23PROD with PROPOSALS1
Federal Register / Vol. 88, No. 245 / Friday, December 22, 2023 / Proposed Rules 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 regulations.gov 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

Action Labor cost Parts cost Cost per product Cost on U.S. 

operators 

Inspections and rerouting ........................ Up to 25 work-hours × $85 per hour = 

Up to $2,125.

$0 Up to $2,125 ........... Up to $40,375. 

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

Action Labor cost Parts cost Cost per 

product 

Replacement of oxygen supply tube ............................ Up to 9 work-hours × $85 per hour = Up to $765 ....... $30 $795 

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 

■ 1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 


ddrumheller on DSK120RN23PROD with PROPOSALS1
88546 Federal Register / Vol. 88, No. 245 / Friday, December 22, 2023 / Proposed Rules 

§ 39.13 [Amended] 

■ 2. The FAA amends § 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. 

(c) Applicability 

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: 9-ANMSeattle-ACO-AMOC-Requests@faa.gov. 

(2) Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the responsible Flight Standards Office. 

(3) An AMOC that provides an acceptable 

level of safety may be used for any repair, 

modification, or alteration required by this 

AD if it is approved by The Boeing Company 

Organization Designation Authorization 

(ODA) that has been authorized by the 

Manager, AIR–520, Continued Operational 

Safety Branch, FAA, to make those findings. 

To be approved, the repair method, 

modification deviation, or alteration 

deviation must meet the certification basis of 

the airplane, and the approval must 

specifically refer to this AD. 

(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: Samuel.K.Nalbandian@faa.gov. 

(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 

myboeingfleet.com. 

(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 www.archives.gov/federal-register/cfr/ 

ibr-locationsoremailfr.inspection@nara.gov. 

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 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 71 

[Docket No. FAA–2023–1758; Airspace 

Docket No. 23–AWP–44] 

RIN 2120–AA66 

Modification of Class E Airspace; 

Mammoth Lakes Airport, Mammoth 

Lakes, CA 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: This action proposes to 

modify the Class E airspace designated 

as a surface area, modify the Class E 

airspace extending upward from 700 

feet above the surface, and remove the 

Class E airspace extending upward from 

1,200 feet above the surface at 

Mammoth Lakes Airport, Mammoth 

Lakes, CA. Additionally, this action 

proposes administrative amendments to 

update the airport’s existing Class E 


ddrumheller on DSK120RN23PROD with PROPOSALS1