Federal Register / Vol. 88, No. 236 / Monday, December 11, 2023 / Rules and Regulations 85833 

and complexity of the institution’s 

operations. The program must ensure 

controls exist to protect the security and 

confidentiality of current, former, and 

potential customer and employee 

information, protect against reasonably 

anticipated cyber threats or hazards to 

the security or integrity of such 

information, and protect against 

unauthorized access to or use of such 

information. 

(b) Role of the board. Each year, the 

board of directors of each System 

institution or an appropriate committee 

of the board must: 

(1) Approve a written cyber risk 

program. The program must be 

consistent with industry standards to 

ensure the institution’s safety and 

soundness and compliance with law 

and regulations; 

(2) Oversee the development, 

implementation, and maintenance of the 

institution’s cyber risk program; and 

(3) Determine necessary expertise for 

executing the cyber risk management 

plan and, where practical, delegate dayto-day responsibilities to management 

and employees. 

(c) Cyber risk program. Each 

institution’s cyber risk program must, at 

a minimum: 

(1) Include an annual risk assessment 

of the internal and external factors 

likely to affect the institution. The risk 

assessment, at a minimum, must: 

(i) Identify and assess internal and 

external factors that could result in 

unauthorized disclosure, misuse, 

alteration, or destruction of current, 

former, and potential customer and 

employee information or information 

systems; and 

(ii) Assess the sufficiency of policies, 

procedures, internal controls, and other 

practices in place to mitigate risks. 

(2) Identify systems and software 

vulnerabilities, prioritize the 

vulnerabilities and the affected systems 

based on risk, and perform timely 

remediation. The particular security 

measures an institution adopts will 

depend upon the size, risk profile, and 

complexity of the institution’s 

operations and activities. 

(3) Maintain an incident response 

plan that contains procedures the 

institution must implement when it 

suspects or detects unauthorized access 

to current, former, or potential 

customer, employee, or other sensitive 

or confidential information. An 

institution’s incident response plan 

must be reviewed and updated 

periodically, but at least annually, to 

address new threats, concerns, and 

evolving technology. The incident 

response plan must contain procedures 

for: 

(i) Assessing the nature and scope of 

an incident, and identifying what 

information systems and types of 

information have been accessed or 

misused; 

(ii) Acting to contain the incident 

while preserving records and other 

evidence; 

(iii) Resuming business activities 

during intrusion response; 

(iv) Notifying the institution’s board 

of directors when the institution learns 

of an incident involving unauthorized 

access to or use of sensitive or 

confidential customer, and/or employee 

information, or unauthorized access to 

financial institution information 

including proprietary information; 

(v) Notifying FCA as soon as possible 

or no later than 36 hours after the 

institution determines that an incident 

has occurred; and 

(vi) Notifying former, current, or 

potential customers and employees and 

known visitors to your website of an 

incident when warranted, and in 

accordance with state and federal laws. 

(4) Describe the plan to train 

employees, vendors, contractors, and 

the institution board to implement the 

institution’s cyber risk program. 

(5) Include policies for vendor 

management and oversight. Each 

institution, at a minimum, must: 

(i) Exercise appropriate due diligence 

in selecting vendors; 

(ii) Negotiate contract provisions, 

when feasible, that facilitate effective 

risk management and oversight and 

specify the expectations and obligations 

of both parties; 

(iii) Conduct a vendor risk assessment 

on all vendors; and 

(iv) Monitor its IT and cyber risk 

management related vendors to ensure 

they have satisfied agreed upon 

expectations and deliverables. 

Monitoring may include reviewing 

audits, summaries of test results, or 

other equivalent evaluations of its 

vendors. 

(6) Maintain robust internal controls 

by regularly testing the key controls, 

systems, and procedures of the cyber 

risk management program. 

(i) The frequency and nature of such 

tests are to be determined by the 

institution’s risk assessment. 

(ii) Tests must be conducted or 

reviewed by independent third parties 

or staff independent of those who 

develop or maintain the cyber risk 

management program. 

(iii) Internal systems and controls 

must provide reasonable assurances that 

System institutions will prevent, detect, 

and remediate material deficiencies on 

a timely basis. 

(d) Privacy. Institutions must consider 

privacy and other legal compliance 

issues, including but not limited to, the 

privacy and security of System 

institution information; current, former, 

and potential borrower information; and 

employee information, as well as 

compliance with statutory requirements 

for the use of electronic media. 

(e) Board reporting requirements. At a 

minimum, each institution must report 

quarterly to its board or an appropriate 

committee of the board. The report must 

contain material matters related to the 

institution’s cyber risk management 

program, including specific risks and 

threats. 

§ 609.935 Business planning. 

The annually approved business plan 

required under subpart J of part 618 of 

this chapter, and § 652.60 of this chapter 

for System institutions and the Federal 

Agricultural Mortgage Corporation, 

respectively, must include a technology 

plan that, at a minimum: 

(a) Describes the institution’s 

intended technology goals, performance 

measures, and objectives; 

(b) Details the technology budget; 

(c) Identifies and assesses the 

adequacy of the institution’s entire 

cyber risk management program, 

including proposed technology changes; 

(d) Describes how the institution’s 

technology and security support the 

current and planned business 

operations; and 

(e) Reviews internal and external 

technology factors likely to affect the 

institution during the planning period. 

§ 609.945 Records retention. 

Records stored electronically must be 

accurate, accessible, and reproducible 

for later reference. 

Dated: December 6, 2023. 

Ashley Waldron, 

Secretary, Farm Credit Administration. 

[FR Doc. 2023–27102 Filed 12–8–23; 8:45 am] 

BILLING CODE 6705–01–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–1816; Project 

Identifier MCAI–2021–01460–R; Amendment 

39–22599; AD 2023–22–15] 

RIN 2120–AA64 

Airworthiness Directives; Airbus 

Helicopters Deutschland GmbH (AHD) 

Helicopters 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 


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85834 Federal Register / Vol. 88, No. 236 / Monday, December 11, 2023 / Rules and Regulations 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for all 

Airbus Helicopters Deutschland GmbH 

(AHD) Model MBB–BK 117 D–3 

helicopters. This AD was prompted by 

recalculations of the inspection 

intervals for certain parts. This AD 

requires revising the airworthiness 

limitations section (ALS) of the existing 

helicopter maintenance manual or 

instructions for continued airworthiness 

for your helicopter and the existing 

approved maintenance or inspection 

program for your helicopter, as 

applicable, to reduce the inspection 

interval of certain parts, as specified in 

a European Union Aviation Safety 

Agency (EASA) AD, which is 

incorporated by reference. The FAA is 

issuing this AD to address the unsafe 

condition on these products. 

DATES: This AD is effective January 16, 

2024. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of January 16, 2024. 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2023–1816; 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, the EASA AD, 

any comments received, and other 

information. The address for Docket 

Operations is U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

Material Incorporated by Reference: 

• For EASA material that is

incorporated by reference in this final 

rule, contact EASA, Konrad-AdenauerUfer 3, 50668 Cologne, Germany; 

telephone +49 221 8999 000; email 

ADs@easa.europa.eu; internet 

easa.europa.eu. You may find the EASA 

material on the EASA website at 

ad.easa.europa.eu. 

• You may view this material at the

FAA, Office of the Regional Counsel, 

Southwest Region, 10101 Hillwood 

Pkwy., Room 6N–321, Fort Worth, TX 

76177. For information on the 

availability of this material at the FAA, 

call (817) 222–5110. It is also available 

at regulations.gov under Docket No. 

FAA–2023–1816. 

Other Related Service Information: 

For Airbus Helicopters service 

information identified in this final rule, 

contact Airbus Helicopters, 2701 North 

Forum Drive, Grand Prairie, TX 75052; 

telephone (972) 641–0000 or (800) 232– 

0323; fax (972) 641–3775; or at 

airbus.com/en/products-services/ 

helicopters/hcare-services/airbusworld. 

You may also view this service 

information at the FAA contact 

information under Material 

Incorporated by Reference above. 

FOR FURTHER INFORMATION CONTACT: Dan 

McCully, Aviation Safety Engineer, 

FAA, 1600 Stewart Avenue, Suite 410, 

Westbury, NY 11590; phone (303) 342– 

1080; email william.mccully@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

EASA, which is the Technical Agent 

for the Member States of the European 

Union, has issued EASA AD 2021–0290, 

dated December 23, 2021; corrected 

December 23, 2021 (EASA AD 2021– 

0290), to correct an unsafe condition for 

all serial-numbered Airbus Helicopters 

Deutschland GmbH Model MBB–BK117 

D–3 and D–3m helicopters. 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 by adding an AD that would 

apply to Airbus Helicopters 

Deutschland GmbH (AHD) Model MBB– 

BK 117 D–3 helicopters. The NPRM 

published in the Federal Register on 

September 7, 2023 (88 FR 61485). The 

NPRM was prompted by recalculations 

of the inspection intervals for certain 

parts. The NPRM proposed to require 

accomplishing the actions specified in 

EASA AD 2021–0290, as incorporated 

by reference, except for any differences 

identified as exceptions in the 

regulatory text of this AD and except as 

discussed under ‘‘Differences Between 

this AD and the EASA AD. The FAA is 

issuing this AD to address the unsafe 

condition on these products. 

You may examine the EASA AD in 

the AD docket at regulations.gov under 

Docket No. FAA–2023–1816. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received no comments on 

the NPRM or on the determination of 

the costs. 

Conclusion 

These helicopters have been approved 

by EASA and are approved for operation 

in the United States. Pursuant to the 

FAA’s bilateral agreement with the 

European Union, EASA has notified the 

FAA about the unsafe condition 

described in its AD. The FAA reviewed 

the relevant data and determined that 

air safety requires adopting this AD as 

proposed. Accordingly, the FAA is 

issuing this AD to address the unsafe 

condition on these helicopters. 

Related Service Information Under 1 

CFR Part 51 

EASA AD 2021–0290 requires 

replacing components before exceeding 

their life limits and accomplishing 

maintenance tasks within thresholds 

and intervals specified in the applicable 

ALS. Depending on the results of the 

maintenance tasks, EASA AD 2021– 

0290 requires accomplishing corrective 

action(s) or contacting AHD [Airbus 

Helicopters Deutschland GmbH] for 

approved instructions and 

accomplishing those instructions. EASA 

AD 2021–0290 also requires revising the 

Aircraft Maintenance Programme (AMP) 

by incorporating the limitations, tasks, 

and associated thresholds and intervals 

described in the specified ALS as 

applicable to helicopter model and 

configuration. Revising the AMP 

constitutes terminating action for the 

requirements to replace components 

before exceeding their life limits and 

accomplish maintenance tasks within 

thresholds and intervals specified in the 

applicable ALS as required by EASA AD 

2021–0290. 

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. 

Other Related Service Information 

The FAA reviewed Airbus Helicopters 

Alert Service Bulletin ASB MBB–BK117 

D–3–04A–001, Revision 0, dated 

December 22, 2021. This service 

information specifies checking the total 

accumulated flight hours since new for 

bolt part number (P/N) D671M7501201, 

bolt P/N D671M7501211, and mast bolt 

P/N D620M0501203, and accomplishing 

the airworthiness inspection within the 

reduced airworthiness inspection 

interval of 400 flight hours. 

The FAA also reviewed Airbus MBB– 

BK117 D–3 Chapter 04, ALS, Revision 1, 

dated December 14, 2021. This service 

information specifies airworthiness 

limitations, tasks, and associated 

thresholds and intervals for various 

parts. Revision 1 of this service 

information specifies various updates 

for certain components. 

Differences Between This AD and the 

EASA AD 

EASA AD 2021–0290 applies to 

Model MBB–BK117 D–3m helicopters, 

whereas this AD does not because that 

model is not FAA type-certificated. 

EASA AD 2021–0290 requires 

replacing certain components before 

exceeding applicable life limits, 

accomplishing certain maintenance 

tasks within thresholds and intervals as 


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Federal Register / Vol. 88, No. 236 / Monday, December 11, 2023 / Rules and Regulations 85835 

specified in the ALS, as defined within, 

and depending on the results, 

accomplishing corrective action within 

the compliance time specified in that 

ALS. EASA AD 2021–0290 also requires 

revising the approved AMP to 

incorporate the limitations, tasks, and 

associated thresholds and intervals 

described in that ALS within 12 months 

after its effective date. Whereas, this AD 

requires revising existing documents 

and programs within 30 days to 

incorporate the limitations, tasks, and 

associated thresholds and intervals 

described in that ALS, and clarifies that 

if an incorporated limitation or 

threshold therein is reached before 30 

days after the effective date of this final 

rule, you still have up to 30 days after 

the effective date of this final rule to 

accomplish the corresponding task. 

Costs of Compliance 

The FAA estimates that this AD 

affects 29 helicopters of U.S. Registry. 

Labor rates are estimated at $85 per 

work-hour. Based on these numbers, the 

FAA estimates the following costs to 

comply with this AD. 

Revising the ALS of the existing 

helicopter maintenance manual or 

instructions for continued airworthiness 

for your helicopter and the existing 

approved maintenance or inspection 

program for your helicopter, as 

applicable, will take about 2 work-hours 

for an estimated cost of $170 per 

helicopter and $4,930 for the U.S. fleet. 

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, 

(2) Will not affect intrastate aviation 

in Alaska, and 

(3) Will 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 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: 

2023–22–15: Airbus Helicopters 

Deutschland GmbH (AHD): Amendment 

39–22599; Docket No. FAA–2023–1816; 

Project Identifier MCAI–2021–01460–R. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective January 16, 2024. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Airbus Helicopters 

Deutschland GmbH (AHD) Model MBB–BK 

117 D–3 helicopters, certificated in any 

category. 

(d) Subject 

Joint Aircraft Service Component (JASC) 

Code: 6710, Main Rotor Control. 

(e) Unsafe Condition 

This AD was prompted by recalculations of 

the inspection intervals for certain parts. The 

FAA is issuing this AD to reduce the 

inspection intervals for certain parts. The 

unsafe condition, if not addressed, could 

result in failure of a part and loss of control 

of the helicopter. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

Except as specified in paragraph (h) of this 

AD: Comply with all required actions and 

compliance times specified in, and in 

accordance with, European Union Aviation 

Safety Agency (EASA) AD 2021–0290, dated 

December 23, 2021; corrected December 23, 

2021 (EASA AD 2021–0290). 

(h) Exceptions to EASA AD 2021–0290 

(1) Where EASA AD 2021–0290 refers to its 

effective date, this AD requires using the 

effective date of this AD. 

(2) This AD does not adopt the 

requirements specified in paragraphs (1), (2), 

(4), and (5) of EASA AD 2021–0290. 

(3) Where paragraph (3) of EASA AD 2021– 

0290 specifies revising ‘‘the approved AMP’’ 

within 12 months after its effective date, this 

AD requires revising the airworthiness 

limitations section of your existing helicopter 

maintenance manual or instructions for 

continued airworthiness and your existing 

approved maintenance or inspection 

program, as applicable, within 30 days after 

the effective date of this AD. 

(4) The initial compliance time for doing 

the tasks specified in paragraph (3) of EASA 

AD 2021–0290 is on or before the applicable 

‘‘limitations’’ and ‘‘associated thresholds’’ as 

incorporated by the requirements of 

paragraph (3) of EASA AD 2021–0290, or 

within 30 days after the effective date of this 

AD, whichever occurs later. 

(5) This AD does not adopt the ‘‘Remarks’’ 

section of EASA AD 2021–0290. 

(i) Provisions for Alternative Actions and 

Intervals 

After the airworthiness limitations section 

of the existing helicopter maintenance 

manual or instructions for continued 

airworthiness; and the existing approved 

maintenance or inspection program, as 

applicable, has been revised as required by 

paragraph (g) of this AD, no alternative 

actions (e.g., inspections) and associated 

thresholds and intervals, including life 

limits, are allowed unless they are approved 

as specified in the provisions of the ‘‘Ref. 

Publications’’ section of EASA AD 2021– 

0290. 

(j) Special Flight Permit 

Special flight permits are prohibited. 

(k) Alternative Methods of Compliance 

(AMOCs) 

(1) 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 local 

Flight Standards District Office, as 

appropriate. If sending information directly 

to the manager of the International Validation 

Branch, send it to the attention of the person 

identified in paragraph (l) of this AD. 

Information may be emailed to: 9-AVS-AIR730-AMOC@faa.gov. 


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85836 Federal Register / Vol. 88, No. 236 / Monday, December 11, 2023 / Rules and Regulations 

(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. 

(l) Related Information 

For more information about this AD, 

contact Dan McCully, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; phone (303) 342– 

1080; email william.mccully@faa.gov. 

(m) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference of 

the service information listed in this 

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

part 51. 

(2) You must use this service information 

as applicable to do the actions required by 

this AD, unless this AD specifies otherwise. 

(i) European Union Aviation Safety Agency 

(EASA) AD 2021–0290, dated December 23, 

2021; corrected December 23, 2021 (EASA 

AD 2021–0290). 

(ii) [Reserved] 

(3) For EASA AD 2021–0290, contact 

EASA, Konrad-Adenauer-Ufer 3, 50668 

Cologne, Germany; telephone +49 221 8999 

000; email ADs@easa.europa.eu; internet 

easa.europa.eu. You may find the EASA 

material on the EASA website at 

ad.easa.europa.eu. 

(4) You may view this service information 

at the FAA, Office of the Regional Counsel, 

Southwest Region, 10101 Hillwood Pkwy., 

Room 6N–321, Fort Worth, TX 76177. 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, 

email: fr.inspection@nara.gov, or go to: 

www.archives.gov/federal-register/cfr/ibrlocations.html. 

Issued on November 30, 2023. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2023–27111 Filed 12–8–23; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–1216; Project 

Identifier AD–2023–00502–E; Amendment 

39–22614; AD 2023–23–12] 

RIN 2120–AA64 

Airworthiness Directives; CFM 

International, S.A. Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for all CFM 

International, S.A. (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 (LEAP–1B) engines. This AD 

was prompted by a manufacturer 

investigation that revealed that certain 

high-pressure turbine (HPT) rotor stage 

1 disks (HPT stage 1 disks) and a certain 

compressor rotor stages 6–10 spool were 

manufactured from material suspected 

to have reduced material properties due 

to iron inclusion. This AD requires 

replacing certain HPT stage 1 disks and 

a certain compressor rotor stages 6–10 

spool. The FAA is issuing this AD to 

address the unsafe condition on these 

products. 

DATES: This AD is effective January 16, 

2024. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of January 16, 2024. 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2023–1216; 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 

address for Docket Operations is U.S. 

Department of Transportation, Docket 

Operations, M–30, West Building 

Ground Floor, Room W12–140, 1200 

New Jersey Avenue SE, Washington, DC 

20590. 

Material Incorporated by Reference: 

• For service information identified 

in this final rule, 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 service 

information 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. It is also 

available at regulations.gov under 

Docket No. FAA–2023–1216. 

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: 

Background 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 by adding an AD that would 

apply to CFM International, S.A. (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. The NPRM published in the 

Federal Register on July 24, 2023 (88 FR 

47404). The NPRM was prompted by a 

manufacturer investigation that detected 

iron inclusion in three non-LEAP–1B 

HPT rotor disks. Further investigation 

determined that the iron inclusion is 

attributed to deficiencies in the 

manufacturing process. The 

manufacturer also determined that 

certain LEAP–1B HPT stage 1 disks and 

a certain compressor rotor stages 6–10 

spool manufactured using the same 

process may have reduced material 

properties and a lower fatigue life 

capability due to iron inclusion, which 

may cause premature fracture and 

subsequent uncontained failure of 

certain HPT stage 1 disks and a certain 

compressor rotor stages 6–10 spool. 

In the NPRM, the FAA proposed to 

require replacement of certain HPT 

stage 1 disks and a certain compressor 

rotor stages 6–10 spool and also prohibit 

installation of an HPT stage 1 disk or 

compressor rotor stages 6–10 spool that 

has a part number and serial number 

identified in the service information 

onto any engine. The FAA is issuing 

this AD to address the unsafe condition 

on these products. 

Discussion of Final Airworthiness 

Directive 

The FAA received comments from 

five commenters. Commenters included 

CFM International, United Air Lines 

(United), The Boeing Company (Boeing), 

Air Line Pilots Association, 

International (ALPA) and Lynx Air 

(Lynx). United, Boeing, and ALPA 

supported the NPRM without change. 

The following presents the comments 

received on the NPRM from CFM and 

Lynx and the FAA’s response to each 

comment. 

Request To Update Service Information 

CFM advised that updated service 

information for replacement of the HPT 

Stage 1 disks and high-pressure 

compressor (HPC) Stage 6–10 spool has 

been published. This updated service 

information provides certain 

corrections, identifies Required by 

Compliance annotations, and updated 

cost information to adequately address 

this unsafe condition. CFM recommends 

the latest revision to be utilized in this 

final rule. 

The FAA agrees with CFM’s 

recommendation to utilize the updated 


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