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 


khammond on DSKJM1Z7X2PROD with PROPOSALS
Federal Register / Vol. 89, No. 218 / Tuesday, November 12, 2024 / Proposed Rules 88909 

Identifier AD–2024–00320–E’’ 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 revise 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 Carol Nguyen, 

Aviation Safety Engineer, FAA, 2200 

South 216th Street, Des Moines, WA 

98198. Any commentary that the FAA 

receives which is not specifically 

designated as CBI will be placed in the 

public docket for this rulemaking. 

Background 

The FAA received a report of an event 

involving an IAE AG Model V2533–A5 

engine that experienced an uncontained 

HPT 1st-stage hub failure that resulted 

in high-energy debris penetrating the 

engine cowling. Further analysis shows 

that new inspections of the HPT 1ststage hub and HPT 2nd-stage hub 

should be added for certain 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 to prevent 

failure of the HPT 1st-stage hub and 

HPT 2nd-stage hub. This condition, if 

not addressed, could result in an 

uncontained hub failure, release of highenergy debris, damage to the engine, 

damage to the airplane, and loss of the 

airplane. 

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. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

revising the ALS of the existing 

approved engine maintenance manual 

or instructions for continued 

airworthiness and the existing approved 

maintenance or inspection program, as 

applicable, to include new inspections 

of the HPT 1st-stage hub and HPT 2ndstage hub. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 1,514 

engines installed on 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 

Revise the ALS ............................................... 1 work-hour × $85 per hour = $85 ................. $0 $85 $128,690 

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: 

International Aero Engines AG: Docket No. 

FAA–2024–2423; Project Identifier AD– 

2024–00320–E. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by December 27, 

2024. 

(b) Affected ADs 

None. 


khammond on DSKJM1Z7X2PROD with PROPOSALS
88910 Federal Register / Vol. 89, No. 218 / Tuesday, November 12, 2024 / Proposed Rules 

(c) Applicability 

This proposed AD applies to 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. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 7250, Turbine Engine Compressor 

Sections. 

(e) Unsafe Condition 

This AD was prompted by further analysis 

of an event involving an IAE AG model 

V2533–A5 engines that experienced an 

uncontained high-pressure turbine (HPT) 1ststage hub failure that resulted in high-energy 

debris penetrating the engine cowling. The 

FAA is issuing this AD to prevent failure of 

the HPT 1st-stage hub and HPT 2nd-stage 

hub. The unsafe condition, if not addressed, 

could result in an uncontained hub failure, 

release of high-energy debris, damage to the 

engine, damage to the airplane, and loss of 

the airplane. 

(f) Compliance 

Comply with this proposed AD within the 

compliance times specified, unless already 

done. 

(g) Required Action 

Within 90 days after the effective date of 

this AD; revise the ‘‘Maintenance 

Scheduling’’ paragraph of the Airworthiness 

Limitations Section (ALS) of the existing 

approved engine maintenance manual (EMM) 

or instructions for continued airworthiness 

and your existing approved maintenance or 

inspection program, as applicable; by 

incorporating the information specified in 

table 1 to paragraph (g) of this AD, as 

applicable. 

TABLE 1 TO PARAGRAPH (g)—ALS ADDITIONAL INSPECTIONS

Part nomenclature Part No. Inspection (engine manual reference) 

HPT Stage 1 Hub ...... 2A5001 ......... TASK 72–45–11–200–006. 

HPT Stage 2 Hub ...... 2A4802 ......... TASK 72–45–11–200–009. 

(h) Provisions for Alternative Actions 

After the action required by paragraph (g) 

of this AD has been done, no alternative 

actions are allowed unless they are approved 

as specified in the provisions of paragraph (i) 

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 local Flight Standards District Office, as 

appropriate. If sending information directly 

to the manager of the AIR–520 Continued 

Operational Safety Branch, send it to the 

attention of the person identified in 

paragraph (j) of this AD and email to: 

AMOC@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. 

(j) Additional Information 

For more information about this AD, 

contact Carol Nguyen, Aviation Safety 

Engineer, FAA, 2200 South 216th Street, Des 

Moines, WA 98198; phone: (781)238–7655; 

email: carol.nguyen@faa.gov. 

(k) Material Incorporated by Reference 

None. 

Issued on November 4, 2024. 

Peter A. White, 

Deputy Director, Integrated Certificate 

Management Division, Aircraft Certification 

Service. 

[FR Doc. 2024–26092 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–2024–2420; Project 

Identifier MCAI–2024–00143–T] 

RIN 2120–AA64 

Airworthiness Directives; De Havilland 

Aircraft of Canada Limited (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 

supersede Airworthiness Directive (AD) 

2022–01–02, which applies to certain 

De Havilland Aircraft of Canada Limited 

Model DHC–8–400, –401, and –402 

airplanes. AD 2022–01–02 requires 

inspecting for corrosion of the nacelle to 

wing rear spar attachment pins, and the 

nacelle to landing gear attachment pins, 

and doing all applicable corrective 

actions. Since the FAA issued AD 2022– 

01–02, it was discovered that some 

operators were unable to identify the 

airplanes subject to each requirement. 

This proposed AD would continue to 

require the actions specified in AD 

2022–01–02, clarify the affected 

airplanes for each required action, and 

revise the applicability by removing 

Model DHC–8–400 airplanes, as 

specified in a Transport Canada AD, 

which is proposed for incorporation by 

reference (IBR). This proposed AD 

would also revise a certain compliance 

time. 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–2024–2420; 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 Transport Canada material 

identified in this proposed AD, contact 

Transport Canada, Transport Canada 

National Aircraft Certification, 159 

Cleopatra Drive, Nepean, Ontario K1A 

0N5, Canada; telephone 888–663–3639; 

email TC.AirworthinessDirectivesConsignesdenavigabilite.TC@tc.gc.ca; 

website at tc.canada.ca/en/aviation. 

• You may view this material at the 

FAA, Airworthiness Products Section, 

Operational Safety Branch, 2200 South 

216th St., Des Moines, WA. For 


khammond on DSKJM1Z7X2PROD with PROPOSALS