Federal Register / Vol. 89, No. 217 / Friday, November 8, 2024 / Proposed Rules 88681 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–2424; Project 

Identifier AD–2024–00416–E] 

RIN 2120–AA64 

Airworthiness Directives; CFM 

International, S.A. 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 CFM International, S.A. (CFM) 

Model LEAP–1A, LEAP–1B, and LEAP– 

1C engines. This proposed AD was 

prompted by a manufacturer 

investigation that revealed a quality 

escape for low-pressure turbine (LPT) 

disks made from forgings with 

nonconforming grain size. This 

proposed AD would require removal 

and replacement of the LPT stage 4 and 

stage 5 disks. 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 23, 

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–2024–2424; 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 CFM material identified in this 

proposed AD, contact CFM 

International, S.A., GE Aviation Fleet 

Support, 1 Neumann Way, M/D Room 

285, Cincinnati, OH 45215; phone: (877) 

432–3272; email: aviation.fleetsupport@

ge.com. 

• You may view this material at the 

FAA, Airworthiness Products Section, 

Operational Safety Branch, 1200 District 

Avenue, Burlington, MA 01803. For 

information on the availability of this 

material at the FAA, call (817) 222– 

5110. 

FOR FURTHER INFORMATION CONTACT: 

Mehdi Lamnyi, Aviation Safety 

Engineer, FAA, 2200 South 216th Street, 

Des Moines, WA 98198; phone: (781) 

238–7743; email: mehdi.lamnyi@

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–2024–2424; Project 

Identifier AD–2024–00416–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 Mehdi Lamnyi, 

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 a quality 

escape on LPT disks made from forgings 

with nonconforming material grain size 

on certain CFM Model LEAP–1A and 

LEAP–1B engines. The supplier 

assessed the duplex micro-structure 

using an arithmetic average grain size 

instead of considering the coarsest grain 

size. After a re-check of all forgings, the 

supplier has identified a number of 

parts with a coarse grain size that is 

below the drawing requirement. 

This condition, if not addressed, 

could result in uncontained part release, 

damage to the engine, and damage to 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. 

Material Incorporated by Reference 

Under 1 CFR Part 51 

The FAA reviewed CFM Service 

Bulletin (SB) LEAP–1A–72–00–0519– 

01A–930A–D, Issue 001–00, dated 

September 18, 2024 (CFM SB LEAP– 

1A–72–00–0519–01A–930A–D); CFM 

SB LEAP–1B–72–00–0419–01A–930A– 

D, Issue 001–00, dated September 18, 

2024 (CFM SB LEAP–1B–72–00–0419– 

01A–930A–D); and CFM SB LEAP–1C– 

72–00–0100–01A–930A–D, Issue 001– 

00, dated September 18, 2024. This 

material specifies the part numbers and 

serial numbers of affected LPT disks, 

and the cycles since new thresholds for 

the replacement of affected LPT disks. 

These documents are distinct because 

they apply to different engine 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. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

removal and replacement of the LPT 

stage 4 and stage 5 disks at the next 

piece-part exposure, or before exceeding 

between 2,400 and 19,000 cycles since 

new, depending on the applicable 

threshold identified in CFM SB LEAP– 

1A–72–00–0519–01A–930A–D or CFM 

SB LEAP–1B–72–00–0419–01A–930A– 

D. 


ddrumheller on DSK120RN23PROD with PROPOSALS1
88682 Federal Register / Vol. 89, No. 217 / Friday, November 8, 2024 / Proposed Rules 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 13 

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 

Remove and replace LEAP–1A LPT stage 5 disk 150 work-hours × $85 per hour = $12,750 .......... $225,500 $238,250 $476,500 

Remove and replace LEAP–1B LPT stage 5 disk 150 work-hours × $85 per hour = $12,750 .......... 205,100 217,850 1,742,800 

Remove and replace LEAP–1B LPT stage 4 disk 150.00 work-hours × $85 per hour = $12,750 ..... 442,800 455,550 1,366,650 

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: 

CFM International, S.A.: Docket No. FAA– 

2024–2424; Project Identifier AD–2024– 

00416–E. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by December 23, 

2024. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to the following CFM 

International, S.A. (CFM) Model engines: 

(1) LEAP–1A23, LEAP–1A24, LEAP– 

1A24E1, LEAP–1A26, LEAP–1A26CJ, LEAP– 

1A26E1, LEAP–1A29, LEAP–1A29CJ, LEAP– 

1A30, LEAP–1A32, LEAP–1A33, LEAP– 

1A33B2, LEAP–1A35A; 

(2) LEAP–1B21, LEAP–1B23, LEAP–1B25, 

LEAP–1B27, LEAP–1B28, LEAP–1B28B1, 

LEAP–1B28B2, LEAP–1B28B2C, LEAP– 

1B28B3, LEAP–1B28BBJ1, LEAP–1B28BBJ2; 

and 

(3) LEAP–1C28, LEAP–1C30, and LEAP– 

1C30B1. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 7250, Turbine Section. 

(e) Unsafe Condition 

This AD was prompted by a manufacturer 

investigation that revealed a quality escape 

for certain low-pressure turbine (LPT) disks 

made from forgings with nonconforming 

grain size. The FAA is issuing this AD to 

prevent the fracture and uncontained failure 

of certain LPT stage 4 and stage 5 disks. The 

unsafe condition, if not addressed, could 

result in uncontained part release, damage to 

the engine, and damage to the airplane. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

(1) For LEAP–1A engines with an installed 

LPT stage 5 disk having a part number (P/N) 

and serial number (S/N) listed in Table 1, 

Table 2, or Table 3 of CFM Service Bulletin 

(SB) LEAP–1A–72–00–0519–01A–930A–D, 

Issue 001–00, dated September 18, 2024 

(CFM SB LEAP–1A–72–00–0519–01A–930A– 

D): At the next piece-part exposure of the 

LPT stage 5 disk, or before exceeding the 

applicable cycles since new (CSN) threshold 

identified in Table 1, Table 2, or Table 3 of 

CFM SB LEAP–1A–72–00–0519–01A–930A– 

D, whichever occurs first after the effective 

date of this AD, remove the LPT stage 5 disk 

from service and replace with a part eligible 

for installation. 

(2) For LEAP–1B engines with an installed 

LPT stage 4 disk having a P/N and S/N listed 

in Table 1 of CFM SB LEAP–1B–72–00– 

0419–01A–930A–D, Issue 001–00, dated 

September 18, 2024 (CFM SB LEAP–1B–72– 

00–0419–01A–930A–D): At the next piecepart exposure of the LPT stage 4 disk, or 

before exceeding the applicable CSN 

threshold identified in Table 1 of CFM SB 

LEAP–1B–72–00–0419–01A–930A–D, 

whichever occurs first after the effective date 

of this AD, remove the LPT stage 4 disk from 

service and replace with a part eligible for 

installation. 

(3) For LEAP–1B engines with an installed 

LPT stage 5 disk having a P/N and S/N listed 

in Table 2 or Table 3 of CFM SB LEAP–1B– 

72–00–0419–01A–930A–D: At the next piecepart exposure of the LPT stage 5 disk, or 

before exceeding the applicable CSN 

threshold identified in Table 2 or Table 3 of 

CFM SB LEAP–1B–72–00–0419–01A–930A– 

D, whichever occurs first after the effective 

date of this AD, remove the LPT stage 5 disk 

from service and replace with a part eligible 

for installation. 

(h) Installation Prohibition 

(1) After the effective date of this AD, do 

not install an LPT stage 5 disk that has a P/ 

N and S/N identified in Table 1, Table 2, or 

Table 3, of CFM SB LEAP–1A–72–00–0519– 

01A–930A–D, in any LEAP–1A engine. 

(2) After the effective date of this AD, do 

not install an LPT stage 4 disk or LPT stage 

5 disk that has a P/N and S/N identified in 


ddrumheller on DSK120RN23PROD with PROPOSALS1
Federal Register / Vol. 89, No. 217 / Friday, November 8, 2024 / Proposed Rules 88683 

Table 1, Table 2, or Table 3, of CFM SB 

LEAP–1B–72–00–0419–01A–930A–D in any 

LEAP–1B engine. 

(3) After the effective date of this AD, do 

not install an LPT stage 5 disk that has a P/ 

N and S/N identified in Table 1 of CFM SB 

LEAP–1C–72–00–0100–01A–930A–D, Issue 

001–00, dated September 18, 2024, in any 

LEAP–1C engine. 

(i) Definitions 

For the purpose of this AD: 

(1) ‘‘LEAP–1A engines’’ are CFM Model 

LEAP–1A23, LEAP–1A24, LEAP–1A24E1, 

LEAP–1A26, LEAP–1A26CJ, LEAP–1A26E1, 

LEAP–1A29, LEAP–1A29CJ, LEAP–1A30, 

LEAP–1A32, LEAP–1A33, LEAP–1A33B2, 

and LEAP–1A35A engines. 

(2) ‘‘LEAP–1B engines’’ are CFM Model 

LEAP–1B21, LEAP–1B23, LEAP–1B25, 

LEAP–1B27, LEAP–1B28, LEAP–1B28B1, 

LEAP–1B28B2, LEAP–1B28B2C, LEAP– 

1B28B3, LEAP–1B28BBJ1, and LEAP– 

1B28BBJ2 engines. 

(3) ‘‘LEAP–1C engines’’ are CFM Model 

LEAP–1C28, LEAP–1C30, and LEAP–1C30B1 

engines. 

(4) A ‘‘part eligible for installation’’ on a 

LEAP–1A engine is an LPT stage 5 disk that 

does not have a P/N and S/N identified in 

Table 1, Table 2, or Table 3 of CFM SB 

LEAP–1A–72–00–0519–01A–930A–D. 

(5) A ‘‘part eligible for installation’’ on a 

LEAP–1B engine is an LPT stage 4 disk or 

LPT stage 5 disk that does not have a P/N and 

S/N identified in Table 1, Table 2, or Table 

3 of CFM SB LEAP–1B–72–00–0419–01A– 

930A–D. 

(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 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 (l) 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. 

(k) Additional Information 

For more information about this AD, 

contact Mehdi Lamnyi, Aviation Safety 

Engineer, FAA, 2200 South 216th Street, Des 

Moines, WA 98198; phone: (781) 238–7743; 

email: mehdi.lamnyi@faa.gov. 

(l) 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) CFM Service Bulletin (SB) LEAP–1A– 

72–00–0519–01A–930A–D, Issue 001–00, 

dated September 18, 2024. 

(ii) CFM SB LEAP–1B–72–00–0419–01A– 

930A–D, Issue 001–00, dated September 18, 

2024. 

(iii) CFM SB LEAP–1C–72–00–0100–01A– 

930A–D, Issue 001–00, dated September 18, 

2024. 

(3) For CFM material identified in this AD, 

contact CFM International, S.A., GE Aviation 

Fleet Support, 1 Neumann Way, M/D Room 

285, Cincinnati, OH 45215; phone: (877) 

432–3272; email: aviation.fleetsupport@

ge.com. 

(4) You may view this material at the FAA, 

Airworthiness Products Section, Operational 

Safety Branch, 1200 District Avenue, 

Burlington, MA 01803. For information on 

the availability of this material at the FAA, 

call (817) 222–5110. 

(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 4, 2024. 

Peter A. White, 

Deputy Director, Integrated Certificate 

Management Division, Aircraft Certification 

Service. 

[FR Doc. 2024–25869 Filed 11–7–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 71 

[Docket No. FAA–2024–1980; Airspace 

Docket No. 24–ASO–21] 

RIN 2120–AA66 

Amendment of Class E Airspace; 

Tarboro, NC 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: This action proposes to 

amend Class E airspace extending 

upward from 700 feet above the surface 

for Tarboro, NC, by adding the ECU 

Health Edgecombe Heliport, Tarboro, 

NC. This action would increase the 

existing radius to accommodate a new 

instrument approach procedure for ECU 

Health Edgecombe Heliport, Tarboro, 

NC. It also incorporates updated 

coordinates for Tarboro Edgecombe 

Airport, Tarboro, NC. Controlled 

airspace is necessary for the safety and 

management of instrument flight rule 

(IFR) operations at this airport. 

DATES: Comments must be received on 

or before December 23, 2024. 

ADDRESSES: Send comments identified 

by FAA Docket No. FAA–2024–1980 

and Airspace Docket No. 24–ASO–21 

using any of the following methods: 

* Federal eRulemaking Portal: Go to 

www.regulations.gov and follow the 

online instructions for sending your 

comments electronically. 

* Mail: Docket Operations, M–30; U.S. 

Department of Transportation, 1200 

New Jersey Avenue SE, Room W12–140, 

West Building Ground Floor, 

Washington, DC 20590–0001. 

* Hand Delivery or Courier: Take 

comments to Docket Operations in 

Room W12–140 of the West Building 

Ground Floor at 1200 New Jersey 

Avenue SE, Washington, DC, between 9 

a.m. and 5 p.m., Monday through 

Friday, except for Federal holidays. 

* Fax: Fax comments to Docket 

Operations at (202) 493–2251. 

Docket: Background documents or 

comments received may be read at 

www.regulations.gov at any time. 

Follow the online instructions for 

accessing the docket or go to the Docket 

Operations in Room W12–140 of the 

West Building Ground Floor at 1200 

New Jersey Avenue SE, Washington, 

DC, between 9 a.m. and 5 p.m., Monday 

through Friday, except for Federal 

holidays. 

FAA Order JO 7400.11J Airspace 

Designations and Reporting Points and 

subsequent amendments can be viewed 

online at www.faa.gov/air_traffic/ 

publications/. You may also contact the 

Rules and Regulations Group, Office of 

Policy, Federal Aviation 

Administration, 800 Independence 

Avenue SW, Washington, DC 20591; 

telephone: (202) 267–8783. 

FOR FURTHER INFORMATION CONTACT: 

Robert Scott Stuart, Operations Support 

Group, Eastern Service Center, Federal 

Aviation Administration, 1701 

Columbia Avenue, College Park, GA 

30337; Telephone: (404) 305–5926. 

SUPPLEMENTARY INFORMATION: 

Authority for This Rulemaking 

The FAA’s authority to issue rules 

regarding aviation safety is found in 

Title 49 of the United States Code. 

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. This rulemaking is 

promulgated under the authority 

described in Subtitle VII, Part A, 

Subpart I, Section 40103. Under that 

section, the FAA is charged with 

prescribing regulations to assign the use 

of airspace necessary to ensure the 

safety of aircraft and the efficient use of 

airspace. This regulation is within the 


ddrumheller on DSK120RN23PROD with PROPOSALS1