Federal Register / Vol. 89, No. 12 / Thursday, January 18, 2024 / Rules and Regulations 3337 

to the airplane control domain, and 

airline information services domain. 

The airplanes’ control domain and 

airline information-services domain 

perform functions required for the safe 

operation and maintenance of the 

airplane. Previously, these domains had 

very limited connectivity with external 

network sources. This data network and 

design integration creates a potential for 

unauthorized persons to access the 

airplanes’ control domain and airline 

information-services domain and 

presents security vulnerabilities related 

to the introduction of computer viruses 

and worms, user errors, and intentional 

sabotage of airplane electronic assets 

(networks, systems, and databases) 

critical to the safety and maintenance of 

the airplane. 

The existing FAA regulations did not 

anticipate these networked airplanesystem architectures. Furthermore, these 

regulations and the current guidance 

material do not address potential 

security vulnerabilities, which could be 

exploited by unauthorized access to 

airplane networks, data buses, and 

servers. Therefore, these special 

conditions ensure that the security (i.e., 

confidentiality, integrity, and 

availability) of the airplane’s systems is 

not compromised by unauthorized 

wired or wireless electronic 

connections. This includes ensuring 

that the security of the airplane’s 

systems is not compromised during 

maintenance of the airplane’s electronic 

systems. These special conditions also 

require the applicant to provide 

appropriate instructions to the operator 

to maintain all electronic-system 

safeguards that have been implemented 

as part of the original network design so 

that this feature does not allow or 

introduce security threats. 

These special conditions contain the 

additional safety standards that the 

Administrator considers necessary to 

establish a level of safety equivalent to 

that established by the existing 

airworthiness standards. 

Applicability 

As discussed above, these special 

conditions are applicable to the 

Gulfstream Model GVIII–G700 and 

GVIII–G800 series airplanes. Should 

Gulfstream apply at a later date for a 

change to the type certificate to include 

another model that incorporates the 

same novel or unusual design feature, or 

should any other model already 

included on the same type certificate be 

modified to incorporate the same novel 

or unusual design feature, these special 

conditions would apply to that model as 

well. 

Conclusion 

This action affects only a certain 

novel or unusual design feature on the 

Gulfstream Model GVIII–G700 and 

GVIII–G800 series of airplanes. It is not 

a rule of general applicability. 

List of Subjects in 14 CFR Part 25 

Aircraft, Aviation safety, Reporting 

and recordkeeping requirements. 

Authority Citation 

The authority citation for these 

special conditions is as follows: 

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

44701, 44702, and 44704. 

The Special Conditions 

Accordingly, pursuant to the 

authority delegated to me by the 

Administrator, the following special 

conditions are issued as part of the type 

certification basis for Gulfstream Model 

GVIII–G700 and GVIII–G800 series 

airplanes for airplane electronic 

unauthorized external access. 

1. The applicant must ensure that the 

airplane electronic systems are 

protected from access by unauthorized 

sources external to the airplane, 

including those possibly caused by 

maintenance activity. 

2. The applicant must ensure that 

airplane electronic system-security 

threats are identified and assessed, and 

that effective electronic system-security 

protection strategies are implemented to 

protect the airplane from all adverse 

impacts on safety, functionality, and 

continued airworthiness. 

3. The applicant must establish 

appropriate procedures to allow the 

operator to ensure that continued 

airworthiness of the airplane is 

maintained, including all post-typecertification modifications that may 

have an impact on the approved 

electronic system-security safeguards. 

Issued in Kansas City, Missouri, on January 

11, 2024. 

Patrick R. Mullen, 

Manager, Technical Innovation Policy 

Branch, Policy and Innovation Division, 

Aircraft Certification Service. 

[FR Doc. 2024–00841 Filed 1–17–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–0032; Project 

Identifier AD–2024–00021–T; Amendment 

39–22663; AD 2024–02–51] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule; request for 

comments. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

The Boeing Company Model 737–9 

airplanes. This AD was prompted by a 

report of an in-flight departure of a mid 

cabin door plug, which resulted in a 

rapid decompression of the airplane. 

This AD prohibits further flight of 

affected airplanes, until the airplane is 

inspected and all applicable corrective 

actions have been performed. The FAA 

previously sent an emergency AD to all 

known U.S. owners and operators of 

these airplanes. The FAA is issuing this 

AD to address the unsafe condition on 

these products. 

DATES: This AD is effective on January 

18, 2024. Emergency AD 2024–02–51, 

issued on January 6, 2024, which 

contained the requirements of this 

amendment, was effective with actual 

notice. 

The FAA must receive comments on 

this AD by March 4, 2024. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 

• 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 by searching 

for and locating Docket No. FAA–2024– 

0032; 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 final rule, 

any comments received, and other 

information. The street address for 

Docket Operations is listed above. 


khammond on DSKJM1Z7X2PROD with RULES
3338 Federal Register / Vol. 89, No. 12 / Thursday, January 18, 2024 / Rules and Regulations 

FOR FURTHER INFORMATION CONTACT: 

Michael Linegang, Manager, Operational 

Safety Branch, FAA; phone: 817–222– 

5390; email: OperationalSafety@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

The FAA invites you to send any 

written relevant data, views, or 

arguments about this AD. Send your 

comments to an address listed under 

ADDRESSES. Include ‘‘Docket No. FAA– 

2024–0032; Project Identifier AD–2024– 

00021–T’’ at the beginning of your 

comments. The most helpful comments 

reference a specific portion of the final 

rule, 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 final rule 

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 final rule. 

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 AD 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 AD, 

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 AD. Submissions containing CBI 

should be sent to Michael Linegang, 

Manager, Operational Safety Branch, 

FAA; phone: 817–222–5390; email: 

OperationalSafety@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 issued Emergency AD 2024– 

02–51, dated January 6, 2024 

(Emergency AD 2024–02–51), to address 

an unsafe condition on certain The 

Boeing Company Model 737–9 

airplanes. The FAA sent the emergency 

AD to all known U.S. owners and 

operators of these airplanes. Emergency 

AD 2024–02–51 prohibits further flight 

until the airplane is inspected and all 

applicable corrective actions have been 

performed. 

Emergency AD 2024–02–51 was 

prompted by a report of an in-flight 

departure of a mid cabin door plug, 

which resulted in a rapid 

decompression of the airplane. The FAA 

is issuing this AD to address the 

potential in-flight loss of a mid cabin 

door plug. This condition, if not 

addressed, could result in injury to 

passengers and crew, the door 

impacting the airplane, and/or loss of 

control of the airplane. 

FAA’s Determination 

The FAA is issuing this AD because 

the agency has determined the unsafe 

condition described previously is likely 

to exist or develop in other products of 

the same type design. 

AD Requirements 

This AD prohibits further flight of 

affected airplanes, until the airplane is 

inspected and all applicable corrective 

actions have been performed using a 

method approved by the Manager, AIR– 

520, Continued Operational Safety 

Branch, FAA. 

Interim Action 

The FAA considers this AD to be an 

interim action. If final action is later 

identified, the FAA might consider 

further rulemaking then. 

FAA’s Justification and Determination 

of the Effective Date 

Section 553(b)(3)(B) of the 

Administrative Procedure Act (APA) (5 

U.S.C. 551 et seq.) authorizes agencies 

to dispense with notice and comment 

procedures for rules when the agency, 

for ‘‘good cause,’’ finds that those 

procedures are ‘‘impracticable, 

unnecessary, or contrary to the public 

interest.’’ Under this section, an agency, 

upon finding good cause, may issue a 

final rule without providing notice and 

seeking comment prior to issuance. 

Further, section 553(d) of the APA 

authorizes agencies to make rules 

effective in less than thirty days, upon 

a finding of good cause. 

An unsafe condition exists that 

required the immediate adoption of 

Emergency AD 2024–02–51 issued on 

January 6, 2024, to all known U.S. 

owners and operators of these airplanes. 

The FAA found that the risk to the 

flying public justified waiving notice 

and comment prior to adoption of this 

rule because the in-flight loss of a mid 

cabin door plug could result in injury to 

passengers and crew, the door 

impacting the airplane, and/or loss of 

control of the airplane. These conditions 

still exist, and the AD is hereby 

published in the Federal Register as an 

amendment to 14 CFR 39.13 to make it 

effective to all persons. Given the 

significance of the risk presented by this 

unsafe condition, it must be 

immediately addressed. Accordingly, 

notice and opportunity for prior public 

comment are impracticable and contrary 

to the public interest pursuant to 5 

U.S.C. 553(b)(3)(B). In addition, the 

FAA finds that good cause exists 

pursuant to 5 U.S.C. 553(d) for making 

this amendment effective in less than 30 

days, for the same reasons the FAA 

found good cause to forgo notice and 

comment. 

Regulatory Flexibility Act (RFA) 

The requirements of the RFA do not 

apply when an agency finds good cause 

pursuant to 5 U.S.C. 553 to adopt a rule 

without prior notice and comment. 

Because the FAA has determined that it 

has good cause to adopt this rule 

without notice and comment, RFA 

analysis is not required. 

Costs of Compliance 

The FAA estimates that this AD 

affects 144 airplanes of U.S. registry. 

The FAA estimates the following costs 

to comply with this AD: 

ESTIMATED COSTS

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

Inspection ....... Up to 8 work-hours × $85 per hour = Up to $680 .. $0 Up to $680 ........................ Up to $12,240. 


khammond on DSKJM1Z7X2PROD with RULES
Federal Register / Vol. 89, No. 12 / Thursday, January 18, 2024 / Rules and Regulations 3339 

The FAA has received no definitive 

data on which to base the cost estimates 

for the corrective actions specified in 

this AD. 

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 

This AD will not have federalism 

implications under Executive Order 

13132. This AD will 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 this AD: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

and 

(2) Will not affect intrastate aviation 

in Alaska. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

Adoption of the Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA amends 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. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

2024–02–51 The Boeing Company: 

Amendment 39–22663; Docket No. 

FAA–2024–0032; Project Identifier AD– 

2024–00021–T. 

(a) Effective Date 

The FAA issued Emergency Airworthiness 

Directive (AD) 2024–02–51 on January 6, 

2024, directly to affected owners and 

operators. As a result of such actual notice, 

the emergency AD was effective for those 

owners and operators on the date it was 

provided. This AD contains the same 

requirements as that emergency AD and, for 

those who did not receive actual notice, is 

effective on January 18, 2024. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to The Boeing Company 

Model 737–9 airplanes, certificated in any 

category, with a mid cabin door plug 

installed. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 52, Doors. 

(e) Unsafe Condition 

This AD was prompted by a report of an 

in-flight departure of a mid cabin door plug, 

which resulted in a rapid decompression of 

the airplane. The FAA is issuing this AD to 

address the potential in-flight loss of a mid 

cabin door plug, which could result in injury 

to passengers and crew, the door impacting 

the airplane, and/or loss of control of the 

airplane. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Inspection or Other Action 

As of the effective date of this AD, further 

flight is prohibited until the airplane is 

inspected and all applicable corrective 

actions have been performed using a method 

approved by the Manager, AIR–520, 

Continued Operational Safety Branch, FAA. 

(h) Special Flight Permits 

Special flight permits, as described in 14 

CFR 21.197 and 21.199, are allowed only for 

unpressurized flights. 

(i) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, AIR–520, Continued 

Operational Safety Branch, FAA, has the 

authority to approve AMOCs for this AD, if 

requested using the procedures found in 14 

CFR 39.19. In accordance with 14 CFR 39.19, 

send your request to your principal inspector 

or local Flight Standards District Office, as 

appropriate. If sending information directly 

to the manager of the certification office, 

send it to the attention of the person 

identified in paragraph (j) 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 local flight standards district office/ 

certificate holding district office. 

(3) An AMOC that provides an acceptable 

level of safety may be used for any repair, 

modification, or alteration required by this 

AD if it is approved by The Boeing Company 

Organization Designation Authorization 

(ODA) that has been authorized by the 

Manager, AIR–520, Continued Operational 

Safety Branch, FAA, to make those findings. 

To be approved, the repair method, 

modification deviation, or alteration 

deviation must meet the certification basis of 

the airplane, and the approval must 

specifically refer to this AD. 

(j) Related Information 

For further information about this AD, 

contact Michael Linegang, Manager, 

Operational Safety Branch, FAA; phone: 

817–222–5390; email: OperationalSafety@

faa.gov. 

(k) Material Incorporated by Reference 

None. 

Issued on January 12, 2024. 

Caitlin Locke, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2024–00993 Filed 1–16–24; 2:00 pm] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–1715; Project 

Identifier MCAI–2023–00548–T; Amendment 

39–22640; AD 2023–25–13] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc., Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

Editorial Note: Rule document 2023–28849 

originally published on pages 256–258 in the 

issue of Wednesday, January 3, 2024. In that 

publication, on page 256, in the second 

column, in the DATES section, on the first, 

second, and sixth lines, and on page 257, in 

the third column, in paragraph ‘‘(a) Effective 

Date,’’ on the second line, ‘‘February 7, 2023’’ 

should read ‘‘February 7, 2024’’. The rule is 

republished here corrected and in its 

entirety. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

Bombardier, Inc., Model CL–600–2B16 

(604 Variant) airplanes. This AD was 

prompted by a report that some 

airplanes were delivered without a 

portable protective breathing equipment 

(PBE) device located in the left-side 

forward wardrobe, flight deck, or 

passenger cabin area of the airplane. 


khammond on DSKJM1Z7X2PROD with RULES