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

8434 

Vol. 87, No. 31 

Tuesday, February 15, 2022 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2022–0094; Project 

Identifier AD–2021–01251–E] 

RIN 2120–AA64 

Airworthiness Directives; CFM 

International, S.A. Turbofan 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 all 

CFM International, S.A. (CFM) LEAP– 

1B21, LEAP–1B23, LEAP–1B25, LEAP– 

1B27, LEAP–1B28, LEAP–1B28B1, 

LEAP–1B28B2, LEAP–1B28B2C, LEAP– 

1B28B3, LEAP–1B28BBJ1, and LEAP– 

1B28BBJ2 model turbofan engines. This 

proposed AD was prompted by the 

detection of melt-related freckles in the 

billet, which may reduce the life of 

certain compressor rotor stages 6–10 

spools, high pressure turbine (HPT) 

rotor mid seals, HPT rotor stage 2 disks, 

low pressure turbine (LPT) stage 2 disks, 

and LPT stage 3 disks. This proposed 

AD would require revising the 

airworthiness limitations section (ALS) 

of the applicable CFM LEAP–1B Engine 

Shop Manual (ESM), and the operator’s 

existing approved continuous 

airworthiness maintenance program 

(CAMP) to incorporate reduced life 

limits for these 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 April 1, 2022. 

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 

https://www.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. 

For service information identified in 

this NPRM, contact CFM International, 

S.A., Aviation Operations Center, 1 

Neumann Way, M/D Room 285, 

Cincinnati, OH 45125; phone: (877) 

432–3272; email: 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. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2022–0094; 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: 

Mehdi Lamnyi, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 

District Avenue, Burlington, MA 01803; 

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 ADDRESSES. Include ‘‘Docket No. 

FAA–2022–0094; Project Identifier AD– 

2021–01251–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 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 https://

www.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, ECO Branch, 

FAA, 1200 District Avenue, Burlington, 

MA 01803. 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 was notified by the engine 

manufacturer of the detection of meltrelated freckles in the billet, which may 

reduce the life of certain compressor 

rotor stages 6–10 spools, HPT rotor mid 

seals, HPT rotor stage 2 disks, LPT stage 

2 disks, and LPT stage 3 disks (lifelimited parts (LLPs)). The 

manufacturer’s investigation determined 

that, as a result of such freckles forming 

in the billet, these LLPs may have 

undetected subsurface anomalies that 

developed during the manufacturing 

process, resulting in reduced material 

properties and a lower fatigue life 

capability. Reduced material properties 

may cause premature LLP fracture, 

which could result in uncontained 

debris release. As a result of its 

investigation, the manufacturer 

determined the need to reduce the life 

limits of these LLPs. To reflect these 

reduced life limits, the manufacturer 

revised the CFM ALS, Chapter 05 of 


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Federal Register / Vol. 87, No. 31 / Tuesday, February 15, 2022 / Proposed Rules 8435 

LEAP–1B ESM. Additionally, the 

manufacturer published service 

information that specifies procedures 

for the removal and replacement of 

these LLPs before reaching their new 

life limits. The FAA is proposing to 

require operators to update the ALS of 

the applicable CFM LEAP–1B ESM, 

with the reduced life limits for these 

LLPs. 

This condition, if not addressed, 

could result in uncontained debris 

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. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed CFM High 

Pressure Compressor Rotor Life Limits 

LEAP–1B–05–11–02–01A–0B1B–C, 

Issue 009–00, dated July 26, 2021 (CFM 

LEAP–1B–05–11–02–01A–0B1B–C); 

CFM High Pressure Turbine Rotor Life 

Limits LEAP–1B–05–11–03–01A–0B1B– 

C, Issue 006–00, dated July 26, 2021 

(CFM LEAP–1B–05–11–03–01A–0B1B– 

C); and CFM Low Pressure Turbine 

Rotor Life Limits LEAP–1B–05–11–04– 

01A–0B1B–C, Issue 006–00, dated June 

1, 2021 (LEAP–1B–05–11–04–01A– 

0B1B–C). CFM LEAP–1B–05–11–02– 

01A–0B1B–C provides new high 

pressure compressor rotor life limits. 

CFM LEAP–1B–05–11–03–01A–0B1B–C 

provides new HPT rotor life limits. CFM 

LEAP–1B–05–11–04–01A–0B1B–C 

provides new LPT rotor life limits. This 

service information is reasonably 

available because the interested parties 

have access to it through their normal 

course of business or by the means 

identified in ADDRESSES. 

Other Related Service Information 

The FAA reviewed CFM Service 

Bulletin LEAP–1B–72–00–0342–01A– 

930A–D, Issue 002–00, dated July 26, 

2021 (LEAP–1B–72–00–0342–01A– 

930A–D). LEAP–1B–72–00–0342–01A– 

930A–D specifies procedures for 

removing and replacing the LLPs, and 

provides new life limits for certain 

serial numbers of the LLPs. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

revising the ALS of the CFM LEAP–1B 

ESM, as applicable to each affected 

engine model, and the operator’s 

existing approved CAMP to incorporate 

reduced life limits for certain LLPs. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 378 

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 ALS of Engine Manual and the operator’s existing approved CAMP.1 work-hour × $85 per hour = $85 ................. $0 $85 $32,130 

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– 

2022–0094; Project Identifier AD–2021– 

01251–E. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by April 1, 

2022. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to CFM International, S.A. 

(CFM) LEAP–1B21, LEAP–1B23, LEAP– 

1B25, LEAP–1B27, LEAP–1B28, LEAP– 

1B28B1, LEAP–1B28B2, LEAP–1B28B2C, 

LEAP–1B28B3, LEAP–1B28BBJ1, and LEAP– 

1B28BBJ2 model turbofan engines. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 7230, Turbine Engine Compressor 

Section, and JASC Code 7250, Turbine 

Section. 

(e) Unsafe Condition 

This AD was prompted by the detection of 

melt-related freckles in the billet, which may 

reduce the life of certain compressor rotor 

stages 6–10 spools, high pressure turbine 

(HPT) rotor mid seals, HPT rotor stage 2 


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8436 Federal Register / Vol. 87, No. 31 / Tuesday, February 15, 2022 / Proposed Rules 

disks, low pressure turbine (LPT) stage 2 

disks, and LPT stage 3 disks. The FAA is 

issuing this AD to prevent the failure of the 

high pressure compressor, HPT rotor, and 

LPT rotor. The unsafe condition, if not 

addressed, could result in release of 

uncontained debris, 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 

Within 60 days after the effective date of 

this AD, revise the airworthiness limitations 

section of the applicable CFM LEAP–1B 

Engine Shop Manual and the operator’s 

existing approved continuous airworthiness 

maintenance program by incorporating the 

following service information: 

(1) CFM High Pressure Compressor Rotor 

Life Limits LEAP–1B–05–11–02–01A–0B1B– 

C, Issue 009–00, dated July 26, 2021; and 

(2) CFM High Pressure Turbine Rotor Life 

Limits LEAP–1B–05–11–03–01A–0B1B–C, 

Issue 006–00, dated July 26, 2021; and 

(3) CFM Low Pressure Turbine Rotor Life 

Limits LEAP–1B–05–11–04–01A–0B1B–C, 

Issue 006–00, dated June 1, 2021. 

(h) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, ECO 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 certification office, 

send it to the attention of the person 

identified in paragraph (i)(1) of this AD and 

email to: ANE-AD-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. 

(i) Related Information 

(1) For more information about this AD, 

contact Mehdi Lamnyi, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 District 

Avenue, Burlington, MA 01803; phone: (781) 

238–7743; email: Mehdi.Lamnyi@faa.gov. 

(2) For service information identified in 

this AD, contact CFM International, S.A., 

Aviation Operations Center, 1 Neumann 

Way, M/D Room 285, Cincinnati, OH 45125; 

phone: (877) 432–3272; email: fleetsupport@

ge.com. You may view this referenced 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. 

Issued on February 3, 2022. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2022–03041 Filed 2–14–22; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2022–0010; Project 

Identifier AD–2021–00850–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 

787–8, 787–9, and 787–10 airplanes. 

This proposed AD was prompted by a 

report that during a C-check, corrosion 

was found in the vertical fin tension 

bolt hole located in the aluminum 

crown frames at Section 48. This 

proposed AD would require inspecting 

certain vertical fin tension bolt holes; 

reviewing the bolt sealant application 

installation procedure in the existing 

maintenance or inspection program, as 

applicable; checking maintenance 

records to determine the replacement 

status of vertical fin tension bolts; and 

doing applicable on-condition actions. 

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 April 1, 2022. 

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 

https://www.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. 

For service information identified in 

this NPRM, 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; 

internet https://

www.myboeingfleet.com. You may view 

this referenced service information 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 https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2022– 

0010. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2022–0010; 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: Greg 

Rutar, Aerospace Engineer, Airframe 

Section, FAA, Seattle ACO Branch, 2200 

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

phone and fax: 206–231–3529; email: 

greg.rutar@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–2022–0010; Project Identifier AD– 

2021–00850–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 https://

www.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 


lotter on DSK11XQN23PROD with PROPOSALS1