Federal Register / Vol. 89, No. 174 / Monday, September 9, 2024 / Proposed Rules 73009 

Moines, WA 98198; phone 206–231–3986; 

email Courtney.K.Tuck@faa.gov. 

(m) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference 

(IBR) of the material listed in this paragraph 

under 5 U.S.C. 552(a) and 1 CFR part 51. 

(2) You must use this material as 

applicable to do the actions required by this 

AD, unless the AD specifies otherwise. 

(i) Boeing Special Attention Service 

Bulletin 767–25–0539, Revision 2, dated 

January 27, 2023. 

(ii) Boeing Special Attention Service 

Bulletin 767–25–0549, Revision 2, dated 

January 27, 2023. 

(3) For Boeing material 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; 

phone 562–797–1717; website 

myboeingfleet.com. 

(4) You may view this material 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. 

(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-locations or email fr.inspection@nara.gov. 

Issued on August 26, 2024. 

Suzanne Masterson, 

Deputy Director, Integrated Certificate 

Management Division, Aircraft Certification 

Service. 

[FR Doc. 2024–20160 Filed 9–6–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–1896; Project 

Identifier MCAI–2023–00978–T] 

RIN 2120–AA64 

Airworthiness Directives; MHI RJ 

Aviation ULC (Type Certificate 

Previously Held by Bombardier Inc.) 

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 

certain MHI RJ Aviation ULC Model 

CL–600–2B19 (Regional Jet Series 100 

and 440), CL–600–2C10 (Regional Jet 

Series 700, 701, and 702), CL–600–2C11 

(Regional Jet Series 550), CL–600–2D15 

(Regional Jet Series 705), CL–600–2D24 

(Regional Jet Series 900), and CL–600– 

2E25 (Regional Jet Series 1000) 

airplanes. AD 2023–10–02 was 

prompted by the determination that 

radio altimeters cannot be relied on to 

perform their intended function if they 

experience interference from wireless 

broadband operations in the 3.7–3.98 

GHz frequency band (5G C-Band). This 

AD was prompted by the determination 

that this interference can also result in 

certain failure messages being inhibited 

longer than intended. This proposed AD 

would require installing a new radio 

frequency (RF) bandpass filter on the 

coaxial line between the radio altimeter 

and the receive antenna in the aft 

equipment compartment. 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 October 24, 

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–2024–1896; 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, the mandatory 

continuing airworthiness information 

(MCAI), any comments received, and 

other information. The street address for 

Docket Operations is listed above. 

Material Incorporated by Reference: 

• For MHI RJ material identified in 

this proposed AD, contact MHI RJ 

Aviation Group, Customer Response 

Center, 3655 Ave. des GrandesTourelles, Suite 110, Boisbriand, 

Que ́bec J7H 0E2 Canada; North America 

toll-free telephone 833–990–7272 or 

direct-dial telephone 450–990–7272; fax 

514–855–8501; email thd.crj@

mhirj.com; website mhirj.com. 

• You may view this material 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. 

FOR FURTHER INFORMATION CONTACT: 

Steven Dzierzynski, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 11590; 

telephone 516–228–7300; email 9-avsnyaco-cos@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–2024–1896; Project Identifier 

MCAI–2023–00978–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 

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 Steven Dzierzynski, 

Aviation Safety Engineer, FAA, 1600 

Stewart Avenue, Suite 410, Westbury, 

NY 11590; telephone 516–228–7300; 

email 9-avs-nyaco-cos@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. 


ddrumheller on DSK120RN23PROD with PROPOSALS1
73010 Federal Register / Vol. 89, No. 174 / Monday, September 9, 2024 / Proposed Rules 

Background 

The FAA issued AD 2023–10–02, 

Amendment 39–22438 (88 FR 34065, 

May 26, 2023) (AD 2023–10–02) to 

address the effect of interference from 

wireless broadband operations in the 5G 

C-Band on all transport and commuter 

category airplanes equipped with a 

radio altimeter. AD 2023–10–02 was 

prompted by a determination that radio 

altimeters cannot be relied upon to 

perform their intended function if they 

experience interference from wireless 

broadband operations in the 5G C-Band. 

AD 2023–10–02 requires revising the 

limitations section of the existing 

airplane flight manual to incorporate 

limitations prohibiting transport and 

commuter category airplanes from 

performing certain low-visibility 

landing operations at any airport unless 

they have upgraded their radio 

altimeters. Transport Canada, which is 

the aviation authority for Canada, issued 

corresponding Transport Canada AD 

CF–2023–46, dated June 30, 2023, to 

require similar limitations on flight 

operations requiring radio altimeter data 

in U.S. airspace affected by 5G C-Band 

wireless signals. 

Additionally, Transport Canada has 

issued Transport Canada AD CF–2023– 

62R1, dated November 21, 2023 

(referred to as ‘‘the MCAI’’), for certain 

serial-numbered MHI RJ Aviation ULC 

Model CL–600–2B19 (Regional Jet 

Series 100 and 440), CL–600–2C10 

(Regional Jet Series 700, 701, and 702), 

CL–600–2C11 (Regional Jet Series 550), 

CL–600–2D15 (Regional Jet Series 705), 

CL–600–2D24 (Regional Jet Series 900), 

and CL–600–2E25 (Regional Jet Series 

1000) airplanes. The MCAI states that, 

in addition to the effects of 5G C-Band 

broadband interference identified in 

FAA AD 2023–10–02, MHI RJ has 

determined that 5G C-Band broadband 

interference can result in certain failure 

messages and aural alerts being 

inhibited longer than intended. 

Specifically, this can result in the 

inhibition of hydraulic system #3 and 

wing anti-ice overheat failure messages 

such that flightcrew are unable to 

perform appropriate airplane flight 

manual (AFM) procedures in the time 

needed to prevent loss of elevator 

control due to hydraulic system 

overheat and wing structural damage 

due to wing anti-ice system overheat. 

This condition, if not corrected, could 

result in delayed flightcrew response 

leading to loss of continued safe flight 

and landing. 

The MCAI requires the installation of 

a new RF bandpass filter on the coaxial 

line between the radio altimeter and the 

receive antenna in the aft equipment 

compartment. For airplanes with a dual 

radio altimeter configuration, the MCAI 

requires a filter to be installed on both 

systems or on one system provided the 

second system is deactivated. When the 

airplane is modified as specified in the 

MCAI, the configuration with the RF 

bandpass filter installed has been 

determined to be ‘‘radio altimeter 

tolerant.’’ The actions of the MCAI 

apply only to airplanes operating within 

the contiguous U.S. airspace. 

The FAA is proposing this AD 

because radio altimeter anomalies can 

result in the inhibition of certain failure 

messages such that the flightcrew are 

unable to perform appropriate AFM 

procedures in the time needed to 

prevent loss of elevator control due to 

hydraulic system overheat and wing 

structural damage due to wing anti-ice 

system overheat, possibly resulting in 

delayed flightcrew response leading to 

loss of continued safe flight and 

landing. 

You may examine the MCAI in the 

AD docket at regulations.gov under 

Docket No. FAA–2024–1896. 

Material Incorporated by Reference 

Under 1 CFR Part 51 

The FAA reviewed MHI RJ Service 

Bulletins 601R–34–152, Revision D, 

dated May 11, 2023, and 670BA–34– 

054, dated February 20, 2023. This 

material specifies procedures for 

installing a new RF bandpass filter on 

the coaxial line between the radio 

altimeter and the receive antenna in the 

aft equipment compartment. These 

documents are distinct since they apply 

to different airplane models. This 

material 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. 

FAA’s Determination 

This product has been approved by 

the aviation authority of another 

country and is approved for operation in 

the United States. Pursuant to the FAA’s 

bilateral agreement with this State of 

Design Authority, it has notified the 

FAA of the unsafe condition described 

in the material referenced above. 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. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

accomplishing the actions specified in 

the material already described. This AD 

would not apply to airplanes that have 

been modified to be a radio altimeter 

tolerant airplane under the requirements 

of AD 2023–10–02. 

Differences Between the MCAI and This 

NPRM 

Although the actions of the MCAI 

apply only to Canadian-registered 

airplanes operating within the 

contiguous U.S. airspace, this proposed 

AD would apply to U.S.-registered 

airplanes operating in any airspace. The 

FAA has determined that the expansion 

of 5G C-band has occurred in other 

countries, such as Canada and Brazil, in 

which 5G C-band interference is 

expected. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect up to 

873 airplanes of U.S. registry. However, 

many of these airplanes may already 

have a bandpass filter installed in 

compliance with AD 2023–10–02 and 

would not have any costs because of 

this proposed AD. The FAA estimates 

the following costs to comply with this 

proposed AD: 

ESTIMATED COSTS

Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

58 work-hours × $85 per hour = $4,930 ................................................... $53,647 $58,577 Up to $51,137,721. 

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 


ddrumheller on DSK120RN23PROD with PROPOSALS1
Federal Register / Vol. 89, No. 174 / Monday, September 9, 2024 / Proposed Rules 73011 

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. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

MHI RJ Aviation ULC (Type Certificate 

Previously Held by Bombardier Inc.): 

Docket No. FAA–2024–1896; Project 

Identifier MCAI–2023–00978–T. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by October 24, 

2024. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to the MHI RJ Aviation 

ULC (Type Certificate previously held by 

Bombardier Inc.) airplanes identified in 

paragraphs (c)(1) through (6) of this AD, 

certificated in any category, that are 

equipped with a radio altimeter and not 

determined to be a radio altimeter tolerant 

airplane as defined in paragraph (g) of this 

AD. 

(1) Model CL–600–2B19 (Regional Jet 

Series 100 and 440) airplanes, serial number 

(S/N) 7002 through 8113. 

(2) Model CL–600–2C10 (Regional Jet 

Series 700, 701, and 702) airplanes, S/N 

10002 through 10999. 

(3) Model CL–600–2C11 (Regional Jet 

Series 550) airplanes, S/N 10002 through 

10999. 

(4) Model CL–600–2D15 (Regional Jet 

Series 705) airplanes, S/N 15001 through 

15990. 

(5) Model CL–600–2D24 (Regional Jet 

Series 900) airplanes, S/N 15001 through 

15990. 

(6) Model CL–600–2E25 (Regional Jet 

Series 1000) airplanes, S/N 19013 through 

19990. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 34, Navigation. 

(e) Unsafe Condition 

This AD was prompted by the 

determination that radio altimeters cannot be 

relied upon to perform their intended 

function if they experience interference from 

wireless broadband operations in the 3.7– 

3.98 GHz frequency band (5G C-Band). The 

FAA is issuing this AD because radio 

altimeter anomalies can result in the 

inhibition of certain failure messages such 

that the flightcrew are unable to perform 

appropriate airplane flight manual 

procedures in the time needed to prevent loss 

of elevator control due to hydraulic system 

overheat and wing structural damage due to 

wing anti-ice system overheat, possibly 

resulting in delayed flightcrew response 

leading to loss of continued safe flight and 

landing. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Definitions 

For purposes of this AD, a ‘‘radio altimeter 

tolerant airplane’’ is one for which the radio 

altimeter, as installed, demonstrates the 

tolerances specified in paragraphs (g)(1) and 

(2) of this AD, using a method approved by 

the FAA. No actions are required by this AD 

for radio altimeter tolerant airplanes. 

(1) Tolerance to radio altimeter 

interference, for the fundamental emissions 

(3.7–3.98 GHz), at or above the power 

spectral density (PSD) curve threshold 

specified in figure 1 to paragraph (g)(1) of 

this AD. 

Figure 1 to Paragraph (g)(1)—Fundamental 

Effective Isotropic PSD at Outside Interface 

of Airplane Antenna 


ddrumheller on DSK120RN23PROD with PROPOSALS1
73012 Federal Register / Vol. 89, No. 174 / Monday, September 9, 2024 / Proposed Rules 

(2) Tolerance to radio altimeter 

interference, for the spurious emissions (4.2– 

4.4 GHz), at or above the PSD curve threshold 

specified in figure 2 to paragraph (g)(2) of 

this AD. 

Figure 2 to Paragraph (g)(2)—Spurious 

Effective Isotropic PSD at Outside Interface 

of Airplane Antenna 


ddrumheller on DSK120RN23PROD with PROPOSALS1EP09SE24.006</GPH>

Height Above Ground (ft) 

Effective Isotro ic PSD dBm/MHz 

-5 

50 -5 

100 -10 

200 -17 

500 -22 

1000 -33 

5000 -47 
Federal Register / Vol. 89, No. 174 / Monday, September 9, 2024 / Proposed Rules 73013 

(h) Filter Installation: Model CL–600–2B19 

For Model CL–600–2B19 airplanes: Within 

2,300 flight hours or 12 months after the 

effective date of this AD, whichever occurs 

first, install a radio frequency (RF) bandpass 

filter on each radio altimeter in accordance 

with the applicable parts of the 

Accomplishment Instructions in MHI RJ 

Service Bulletin 601R–34–152, Revision D, 

dated May 11, 2023. Alternatively, airplanes 

with a dual radio altimeter configuration may 

comply with this paragraph by installing an 

RF bandpass filter on one radio altimeter and 

deactivating the second radio altimeter in 

accordance with the applicable parts of the 

Accomplishment Instructions in MHI RJ 

Service Bulletin 601R–34–152, Revision D, 

dated May 11, 2023. 

(i) Filter Installation: Model CL–600–2C10, 

CL–600–2C11, CL–600–2D15, and CL–600– 

2D24 

For Model CL–600–2C10, CL–600–2C11, 

CL–600–2D15, and CL–600–2D24 airplanes: 

Within 2,100 flight hours or 12 months after 

the effective date of this AD, whichever 

occurs first, install an RF bandpass filter on 

each radio altimeter in accordance with the 

applicable parts of the Accomplishment 

Instructions in MHI RJ Service Bulletin 

670BA–34–054, dated February 20, 2023. 

Alternatively, airplanes with a dual radio 

altimeter configuration may comply with this 

paragraph by installing an RF bandpass filter 

on one radio altimeter and deactivating the 

second radio altimeter in accordance with 

the applicable parts of the Accomplishment 

Instructions in MHI RJ Service Bulletin 

670BA–34–054, dated February 20, 2023. 

(j) Filter Installation: Model CL–600–2E25 

For Model CL–600–2E25 airplanes: Before 

the next flight in the contiguous U.S. airspace 

after the effective date of this AD, install an 

RF bandpass filter on each radio altimeter in 

accordance with the applicable parts of the 

Accomplishment Instructions in MHI RJ 

Service Bulletin 670BA–34–054, dated 

February 20, 2023. 


ddrumheller on DSK120RN23PROD with PROPOSALS1EP09SE24.007</GPH>

-110 

+-> 

~ -115 C: 

0 

:~ _ -120 

E N 

LJ.I :C 

~ ~ -125 

o E ·.:: c:Cl :::i -o -130 

C. - V') N 

...... :c 

0 :ii: -135 

~o 

~ ~ -140 

g- B 

;; o -145 

0 0 

.!12~ 

~ -150 

·.,::; 

u 

J::! -155 ...... 

LU 

-160 

1 10 100 1000 

Height Above Ground Level (feet) 

Airplane Altitude (ft AGL) Effective Isotropic PSD (dBm/MHz) 

1 -116.50 

400 -116.50 

500 -126.00 

1000 -139.00 

2000 -147.00 

3000 -151.00 

5000 -156.00 
73014 Federal Register / Vol. 89, No. 174 / Monday, September 9, 2024 / Proposed Rules 

(k) Credit for Previous Actions 

For Model CL–600–2B19 airplanes: This 

paragraph provides credit for the actions 

required by paragraph (h) of this AD, if those 

actions were performed before the effective 

date of this AD using the material in 

paragraphs (k)(1) through (4) of this AD, 

provided the electrical idents for coax cables 

are installed using Part G of the 

Accomplishment Instructions in MHI RJ 

Service Bulletin 601R–34–152, Revision D, 

dated May 11, 2023, within the compliance 

time specified in paragraph (h) of this AD. 

(1) MHI RJ Service Bulletin 601R–34–152, 

dated February 14, 2023. 

(2) MHI RJ Service Bulletin 601R–34–152, 

Revision A, dated February 28, 2023. 

(3) MHI RJ Service Bulletin 601R–34–152, 

Revision B, dated March 28, 2023. 

(4) MHI RJ Service Bulletin 601R–34–152, 

Revision C, dated April 20, 2023. 

(l) Additional AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, International 

Validation 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 International Validation 

Branch, mail it to the address identified in 

paragraph (m) of this AD. Information may be 

emailed to: 9-AVS-NYACO-COS@faa.gov. 

Before using any approved AMOC, notify 

your appropriate principal inspector, or 

lacking a principal inspector, the manager of 

the responsible Flight Standards Office. 

(2) Contacting the Manufacturer: For any 

requirement in this AD to obtain instructions 

from a manufacturer, the instructions must 

be accomplished using a method approved 

by the Manager, International Validation 

Branch, FAA; or Transport Canada; or MHI 

RJ Aviation ULC’s Transport Canada Design 

Approval Organization (DAO). If approved by 

the DAO, the approval must include the 

DAO-authorized signature. 

(m) Additional Information 

For more information about this AD, 

contact Steven Dzierzynski, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; telephone 516– 

228–7300; email 9-avs-nyaco-cos@faa.gov. 

(n) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference of 

the material listed in this paragraph under 5 

U.S.C. 552(a) and 1 CFR part 51. 

(2) You must use this material as 

applicable to do the actions required by this 

AD, unless this AD specifies otherwise. 

(i) MHI RJ Service Bulletin 601R–34–152, 

Revision D, dated May 11, 2023. 

(ii) MHI RJ Service Bulletin 670BA–34– 

054, dated February 20, 2023. 

(3) For MHI RJ material identified in this 

AD, contact MHI RJ Aviation Group, 

Customer Response Center, 3655 Ave. des 

Grandes-Tourelles, Suite 110, Boisbriand, 

Que ́bec J7H 0E2 Canada; North America tollfree telephone 833–990–7272 or direct-dial 

telephone 450–990–7272; fax 514–855–8501; 

email thd.crj@mhirj.com; website mhirj.com. 

(4) You may view this material 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 August 28, 2024. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2024–20244 Filed 9–5–24; 11:15 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–2137; Project 

Identifier AD–2023–00297–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) 

2019–22–02, which applies to all The 

Boeing Company Model 747–200B, 747– 

200C, 747–200F, 747–300, 747–400, 

747–400D, 747–400F, 747–8F, and 747– 

8 series airplanes. AD 2019–22–02 was 

prompted by reports of uncommanded 

fore and aft movement of the Captain’s 

and First Officer’s seats. AD 2019–22–02 

requires identifying the part number, 

and the serial number if applicable, of 

the Captain’s and First Officer’s seats, 

and applicable on-condition actions for 

affected seats. AD 2019–22–02 also 

requires a one-time detailed inspection 

and repetitive checks of the horizontal 

movement system (HMS) of the 

Captain’s and First Officer’s seats, and 

applicable on-condition actions. AD 

2019–22–02 also provides an optional 

terminating action for the repetitive 

actions for certain seats. Since the FAA 

issued AD 2019–22–02, the FAA has 

determined that additional seats are 

affected by the unsafe condition. This 

proposed AD would retain the actions 

required by AD 2019–22–02 and adds 

an inspection of previously omitted part 

numbers. 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 October 24, 

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–2024–2137; 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 Boeing material identified in 

this proposed AD, contact Boeing 

Commercial Airplanes, Attention: 

Contractual & Data Services (C&DS), 

2600 Westminster Boulevard, MC 110– 

SK57, Seal Beach, CA 90740–5600; 

phone 562–797–1717; website 

myboeingfleet.com. 

• You may view this material 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 regulations.gov by 

searching for and locating Docket No. 

FAA–2024–2137. 

FOR FURTHER INFORMATION CONTACT: 

Courtney Tuck, Aviation Safety 

Engineer, FAA, 2200 South 216th Street, 

Des Moines, WA 98198; phone 206– 

231–3986; email Courtney.K.Tuck@

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–2024–2137; Project Identifier AD– 

2023–00297–T’’ at the beginning of your 

comments. The most helpful comments 


ddrumheller on DSK120RN23PROD with PROPOSALS1