This section of the FEDERAL REGISTER

contains notices to the public of the proposed

issuance of rules and regulations. The

purpose of these notices is to give interested

persons an opportunity to participate in the

rule making prior to the adoption of the final

rules.

Proposed Rules Federal Register

88906 

Vol. 89, No. 218 

Tuesday, November 12, 2024 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–2408; Project 

Identifier AD–2024–00362–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 

certain The Boeing Company Model 

747–400, 747–400F, 747–8F, and 747–8 

series airplanes. This proposed AD was 

prompted by a report that, during 

potable water servicing, there were 

multiple engine indicating and crew 

alerting system messages. The cause was 

the separation of a fitting and steel 

water supply tube above an electronics 

equipment cooling air filter, behind the 

forward cargo compartment left 

sidewall. This proposed AD would 

require, depending on configuration, 

installing at certain locations: conduits 

on exposed potable water supply lines, 

envelope assemblies over all exposed 

potable water line fittings and exposed 

potable water supply lines, a slitted 

spray shield, a 2-piece deflector shield 

around the equipment cooling system 

air inlet, and/or a shroud on exposed 

potable water supply lines. 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 December 27, 

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–2024–2408; 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 the Boeing material identified 

in this proposed 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. 

• 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. 

It is also available at regulations.gov 

under Docket No. FAA–2024–2408. 

FOR FURTHER INFORMATION CONTACT: 

Courtney Tuck, Aviation Safety 

Engineer, FAA, 2200 South 216th St., 

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 the ADDRESSES section. Include 

‘‘Docket No. FAA–2024–2408; Project 

Identifier AD–2024–00362–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 Courtney Tuck, 

Aviation Safety Engineer, FAA, 2200 

South 216th St., Des Moines, WA 98198; 

phone: 206–231–3986; email: 

Courtney.K.Tuck@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 during potable water 

servicing on a Model 777 freighter 

airplane, there were multiple engine 

indicating and crew alerting system 

messages. The cause was the separation 

of a fitting and steel water supply tube 

above an electronics equipment cooling 

air filter, behind the forward cargo 

compartment left sidewall. Water from 

the soaked filter was subsequently 

sprayed by the equipment cooling 

system onto multiple line replaceable 

units in the main electronics center. Due 

to similar designs to the Model 777 

freighter airplanes, Boeing developed a 

precautionary solution for Model 747– 

400, 747–400F, 747–8F, and 747–8 

airplane configurations having potable 

water supply lines and connections near 


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Federal Register / Vol. 89, No. 218 / Tuesday, November 12, 2024 / Proposed Rules 88907 

the equipment cooling supply (ECS) air 

inlet. The solution includes installing 

shrouding around the potable water 

lines and conduits near the ECS air 

equipment the electrical equipment 

cooling duct to collect any water leaks 

and allow collected water to flow 

gravitationally away and at a safe 

distance from the ECS air inlet and the 

electronic equipment cooling duct to the 

floor of the airplane, preventing water 

leaks into the main electronics center. 

This condition, if not addressed, could 

result in an adverse impact on the 

function of multiple electronics and line 

replaceable units (LRUs) in the 

equipment bay racks that are essential 

for safe flight, which can lead to the loss 

of continued safe flight and landing. 

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. 

Material Incorporated by Reference 

Under 1 CFR Part 51 

The FAA reviewed Boeing Alert 

Requirements Bulletin 747–38A2146 

RB, dated August 7, 2024. This material 

specifies procedures for, depending on 

configuration, installing: conduits on 

exposed potable water supply lines 

between station (STA) 580 and STA 

650, between STA 575 and STA 650, or 

between STA 595 and STA 650, as 

applicable; envelope assemblies over all 

exposed potable water line fittings and 

exposed potable water supply lines 

between STA 650 and STA 660, 

between STA 640 and STA 660, 

between STA 570 and STA 580, 

between STA 570 and STA 580 and 

between STA 650 and STA 660, 

between STA 580 and STA 600 and 

between STA 650 and STA 660, or 

between STA 580 and STA 600, as 

applicable; a slitted spray shield; a 2- 

piece deflector shield around the ECS 

air inlet STA 610; a spray shield; and/ 

or a shroud on exposed potable water 

supply line between STA 550 and STA 

680. 

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. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

accomplishing the actions specified in 

the material already described, except 

for any differences identified as 

exceptions in the regulatory text of this 

proposed AD. For information on the 

procedures and compliance times, see 

this material at regulations.gov under 

Docket No. FAA–2024–2408. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 178 

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 

Installations ............ Up to 22 work-hours × $85 per hour = Up to $1,870 ...... Up to $4,980 ........ Up to $6,850 ........ Up to $1,219,300. 

The FAA has included all known 

costs in its cost estimate. According to 

the manufacturer, however, some or all 

of 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. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

The Boeing Company: Docket No. FAA– 

2024–2408; Project Identifier AD–2024– 

00362–T. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by December 27, 

2024. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to The Boeing Company 

Model 747–400, 747–400F, 747–8F, and 747– 

8 series airplanes, certificated in any 

category, as identified in Boeing Alert 

Requirements Bulletin 747–38A2146 RB, 

dated August 7, 2024. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 38, Water/waste. 


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88908 Federal Register / Vol. 89, No. 218 / Tuesday, November 12, 2024 / Proposed Rules 

(e) Unsafe Condition 

This AD was prompted by a report that, 

during potable water servicing, there were 

multiple engine indicating and crew alerting 

system messages. The cause was the 

separation of a fitting and steel water supply 

tube above an electronics equipment cooling 

air filter, behind the forward cargo 

compartment left sidewall. The FAA is 

issuing this AD to address water leaks into 

the main electronics center. The unsafe 

condition, if not addressed, could result in an 

adverse impact on the function of multiple 

electronics and line replaceable units (LRUs) 

in the equipment bay racks that are essential 

for safe flight, which can lead to the loss of 

continued safe flight and landing. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

Except as specified by paragraph (h) of this 

AD: At the applicable times specified in the 

‘‘Compliance’’ paragraph of Boeing Alert 

Requirements Bulletin 747–38A2146 RB, 

dated August 7, 2024, do all applicable 

actions identified in, and in accordance with, 

the Accomplishment Instructions of Boeing 

Alert Requirements Bulletin 747–38A2146 

RB, dated August 7, 2024. 

Note 1 to paragraph (g): Guidance for 

accomplishing the actions required by this 

AD can be found in Boeing Alert Service 

Bulletin 747–38A2146, dated August 7, 2024, 

which is referred to in Boeing Alert 

Requirements Bulletin 747–38A2146 RB, 

dated August 7, 2024. 

(h) Exception to Requirements Bulletin 

Specifications 

Where the Compliance Time columns of 

the tables in the ‘‘Compliance’’ paragraph of 

Boeing Alert Requirements Bulletin 747– 

38A2146 RB, dated August 7, 2024, refer to 

the original issue date of Requirements 

Bulletin 747–38A2146 RB, this AD requires 

using the effective date of this AD. 

(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 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 (j)(1) of this AD. 

Information may be emailed to: AMOC@

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. 

(j) Related Information 

(1) For more information about this AD, 

contact Courtney Tuck, Aviation Safety 

Engineer, FAA, 2200 South 216th St., Des 

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

email: Courtney.K.Tuck@faa.gov. 

(2) Material identified in this AD that is not 

incorporated by reference is available at the 

address specified in paragraph (k)(3) this AD. 

(k) 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 the AD specifies otherwise. 

(i) Boeing Alert Requirements Bulletin 

747–38A2146 RB, dated August 7, 2024. 

(ii) [Reserved] 

(3) For Boeing material 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 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-locations or email fr.inspection@nara.gov. 

Issued on November 5, 2024. 

Peter A. White, 

Deputy Director, Integrated Certificate 

Management Division, Aircraft Certification 

Service. 

[FR Doc. 2024–26128 Filed 11–8–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–2423; Project 

Identifier AD–2024–00320–E] 

RIN 2120–AA64 

Airworthiness Directives; International 

Aero Engines AG Engines 

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 International Aero Engines (IAE 

AG) Model V2522–A5, V2524–A5, 

V2525–D5, V2527–A5, V2527E–A5, 

V2527M–A5, V2528–D5, V2530–A5, 

V2531–E5, and V2533–A5 engines. This 

proposed AD was prompted by further 

analysis of an event involving an IAE 

AG Model V2533–A5 engine that had an 

uncontained failure of a high-pressure 

turbine (HPT) 1st-stage hub that resulted 

in high-energy debris penetrating the 

engine cowling. This proposed AD 

would require revising the 

airworthiness limitations section (ALS) 

of the existing maintenance manual or 

instructions for continued airworthiness 

and the existing approved maintenance 

or inspection program, as applicable, to 

include new inspections of certain 

critical rotating 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 December 27, 

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–2024–2423; 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. 

FOR FURTHER INFORMATION CONTACT: 

Carol Nguyen, Aviation Safety Engineer, 

FAA, 2200 South 216th Street, Des 

Moines, WA 98198 phone: (781) 238– 

7655; email: carol.nguyen@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 the ADDRESSES section. Include 

‘‘Docket No. FAA–2024–2423; Project 


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