82896 Federal Register / Vol. 85, No. 245 / Monday, December 21, 2020 / Rules and Regulations 

number of purchase money mortgages 

purchased by that Enterprise in each 

year that finance owner-occupied 

single-family properties. 

(d) * * * 

(2) The benchmark level, which for 

2021 shall be 6 percent of the total 

number of purchase money mortgages 

purchased by that Enterprise in each 

year that finance owner-occupied 

single-family properties. 

* * * * * 

(f) * * * 

(2) The benchmark level, which for 

2021 shall be 14 percent of the total 

number of purchase money mortgages 

purchased by that Enterprise in each 

year that finance owner-occupied 

single-family properties. 

(g) * * * 

(2) The benchmark level, which for 

2021 shall be 21 percent of the total 

number of refinancing mortgages 

purchased by that Enterprise in each 

year that finance owner-occupied 

single-family properties. 

■ 3. Section 1282.13 is amended by 

revising paragraphs (b) through (d) to 

read as follows: 

§ 1282.13 Multifamily special affordable 

housing goal and subgoals. 

* * * * * 

(b) Multifamily low-income housing 

goal. The benchmark level for each 

Enterprise’s purchases of mortgages on 

multifamily residential housing 

affordable to low-income families shall 

be at least 315,000 dwelling units 

affordable to low-income families in 

multifamily residential housing 

financed by mortgages purchased by the 

Enterprise for 2021. 

(c) Multifamily very low-income 

housing subgoal. The benchmark level 

for each Enterprise’s purchases of 

mortgages on multifamily residential 

housing affordable to very low-income 

families shall be at least 60,000 dwelling 

units affordable to very low-income 

families in multifamily residential 

housing financed by mortgages 

purchased by the Enterprise for 2021. 

(d) Small multifamily low-income 

housing subgoal. The benchmark level 

for each Enterprise’s purchases of 

mortgages on small multifamily 

properties affordable to low-income 

families shall be at least 10,000 dwelling 

units affordable to low-income families 

in small multifamily properties financed 

by mortgages purchased by the 

Enterprise for 2021. 

Mark A. Calabria, 

Director, Federal Housing Finance Agency. 

[FR Doc. 2020–28083 Filed 12–18–20; 8:45 am] 

BILLING CODE 8070–01–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2020–0689; Product 

Identifier 2020–NM–060–AD; Amendment 

39–21359; AD 2020–26–04] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is superseding 

Airworthiness Directive (AD) 2013–18– 

08, which applied to certain The Boeing 

Company Model 737–200, –200C, –300, 

–400, and –500 series airplanes. AD 

2013–18–08 required repetitive 

inspections for cracking of certain skin 

panels of the fuselage, and of the 

fuselage skin along certain chem-milled 

lines, and corrective actions if 

necessary. AD 2013–18–08 also 

included a terminating action for the 

repetitive inspections of certain areas. 

This AD retains those actions, expands 

the nondestructive inspection (NDI) 

area, and adds airplanes to the 

applicability. This AD was prompted by 

reports of additional cracking in certain 

horizontal and vertical chem-milled 

step locations outside of those identified 

in AD 2013–18–08. The FAA is issuing 

this AD to address the unsafe condition 

on these products. 

DATES: This AD is effective January 25, 

2021. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of January 25, 2021. 

ADDRESSES: For service information 

identified in this final rule, 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 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 on the internet at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2020–0689. 

Examining the AD Docket 

You may examine the AD docket on 

the internet at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2020– 

0689; 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. 

FOR FURTHER INFORMATION CONTACT: 

James Guo, Aerospace Engineer, 

Airframe Section, FAA, Los Angeles 

ACO Branch, 3960 Paramount 

Boulevard, Lakewood, CA 90712–4137; 

phone: 562–627–5357; fax: 562–627– 

5210; email: james.guo@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Discussion 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 to supersede AD 2013–18–08, 

Amendment 39–17581 (78 FR 60660, 

October 2, 2013) (AD 2013–18–08). AD 

2013–18–08 applied to certain The 

Boeing Company Model 737–200, 

–200C, –300, –400, and –500 series 

airplanes. The NPRM published in the 

Federal Register on August 17, 2020 (85 

FR 49978). The NPRM was prompted by 

reports of additional cracking in certain 

horizontal and vertical chem-milled 

step locations outside of those identified 

in AD 2013–18–08. The NPRM 

proposed to continue to require 

repetitive inspections for cracking of the 

fuselage skin along certain chem-milled 

lines and applicable on-condition 

actions, and to expand the NDI area. 

The NPRM also proposed to continue to 

provide terminating action for repetitive 

inspections of certain modified or 

repaired areas. The NPRM also 

proposed to add airplanes to the 

applicability. The FAA is issuing this 

AD to address fatigue cracking of the 

skin panels, which could result in 

sudden fracture and failure of the skin 

panels of the fuselage, and consequent 

rapid decompression of the airplane. 

Comments 

The FAA gave the public the 

opportunity to participate in developing 

this AD. The following presents the 

comments received on the NPRM and 

the FAA’s response to each comment. 

An individual had no objection to the 

NPRM. 

Effect of Winglets on Accomplishment 

of the Proposed Actions 

Aviation Partners Boeing stated that 

accomplishing Supplemental Type 

Certificate (STC) ST01219SE does not 

Federal Register / Vol. 85, No. 245 / Monday, December 21, 2020 / Rules and Regulations 82897 

affect compliance with the proposed 

actions. 

The FAA agrees with the commenter. 

Paragraph (c) of the proposed AD has 

been redesignated as paragraph (c)(1) of 

this AD, and paragraph (c)(2) has been 

added to this AD to state that 

installation of STC ST01219SE does not 

affect the ability to accomplish the 

actions required by this AD. Therefore, 

for airplanes on which STC ST01219SE 

is installed, a ‘‘change in product’’ 

alternative method of compliance 

(AMOC) approval request is not 

necessary to comply with the 

requirement of 14 CFR 39.17. 

Request To Revise Certain Language in 

the Preamble 

Boeing asked that the FAA change the 

language under the section titled 

‘‘Actions Since AD 2013–18–08 was 

Issued.’’ Boeing asked that the FAA 

refer to the ‘‘NDI inspection’’ instead of 

the ‘‘repetitive inspection.’’ 

Boeing also asked that the FAA 

change the language under the section 

titled ‘‘Proposed AD Requirements.’’ 

Boeing asked that the FAA refer to the 

expanded area for the existing NDI 

inspection instead of referring to the 

expanded area for the existing 

inspection. 

Boeing requested these changes 

because Boeing Alert Service Bulletin 

737–53A1346, dated March 27, 2020, 

expands only the initial and repetitive 

NDI areas and not the detailed visual 

inspection area. 

The FAA acknowledges that the 

expanded inspections are only to the 

NDI area. Those sections of the 

preamble do not reappear in the final 

rule; however, the FAA clarified that the 

NDI area is expanded in the Summary 

and Discussion sections. 

Conclusion 

The FAA reviewed the relevant data, 

considered the comments received, and 

determined that air safety and the 

public interest require adopting this AD 

with the changes described previously, 

and minor editorial changes. The FAA 

has determined that these minor 

changes: 

• Are consistent with the intent that 

was proposed in the NPRM for 

addressing the unsafe condition; and 

• Do not add any additional burden 

upon the public than was already 

proposed in the NPRM. 

The FAA also determined that these 

changes will not increase the economic 

burden on any operator or increase the 

scope of this AD. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Boeing Alert 

Service Bulletin 737–53A1346, dated 

March 27, 2020. This service 

information describes procedures for 

repetitive detailed and non-destructive 

tests (NDTs) (including external 

medium frequency eddy current 

(MFEC), external magneto optical 

imaging (MOI), external c-scan, external 

sliding probe, external high frequency 

eddy current (HFEC), external low 

frequency eddy current (LFEC), internal 

ultrasonic phased array (UTPA), or 

internal ultrasonic); inspections for 

cracking of the fuselage skin along all 

horizontal and vertical chem-milled 

locations with a history of cracking 

between stations (STAs) 259.5 and 1016; 

and applicable on-condition actions. 

On-condition actions include repair; 

LFEC inspections of certain repairs for 

cracking; detailed inspections of certain 

repairs for cracking and loose, missing, 

or damaged fasteners; replacement of 

loose, missing, or damaged fasteners; 

and preventative modifications. 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 the ADDRESSES section. 

Costs of Compliance 

The FAA estimates that this AD 

affects 141 airplanes of U.S. registry. 

The FAA estimates the following costs 

to comply with this AD: 

ESTIMATED COSTS FOR REQUIRED ACTIONS

Action Labor cost Parts cost Cost per product 

Inspections ........ Up to 165 work-hours × $85 per hour = Up to 

$14,025 per inspection cycle.

$0 Up to $1,977,525 per inspection cycle. 

The FAA estimates the following 

costs to do any necessary corrective 

actions required based on the results of 

the inspections. The FAA has no way of 

determining the number of aircraft that 

might need these corrective actions: 

ESTIMATED COSTS OF ON-CONDITION ACTIONS

Labor cost Parts cost Cost per product 

Up to 185 work-hours × $85 per hour = Up to 

$15,725.

$* ...................................................................... Up to $15,725. 

* The FAA has received no definitive data that enables providing parts costs for the on-condition actions specified in this AD. 

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 has determined that 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: 

82898 Federal Register / Vol. 85, No. 245 / Monday, December 21, 2020 / Rules and Regulations 

(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. 

Adoption of 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: 

■ a. Removing Airworthiness Directive 

(AD) 2013–18–08, Amendment 39– 

17581 (78 FR 60660, October 2, 2013), 

and 

■ b. Adding the following new AD: 

2020–26–04 The Boeing Company: 

Amendment 39–21359; Docket No. 

FAA–2020–0689; Product Identifier 

2020–NM–060–AD. 

(a) Effective Date 

This AD is effective January 25, 2021. 

(b) Affected ADs 

This AD replaces AD 2013–18–08, 

Amendment 39–17581 (78 FR 60660, October 

2, 2013) (AD 2013–18–08). 

(c) Applicability 

(1) This AD applies to The Boeing 

Company Model 737–100, –200, –200C, 

–300, –400, and –500 series airplanes, 

certificated in any category, as identified in 

Boeing Alert Service Bulletin 737–53A1346, 

dated March 27, 2020. 

(2) Installation of Supplemental Type 

Certificate (STC) ST01219SE does not affect 

the ability to accomplish the actions required 

by this AD. Therefore, for airplanes on which 

STC ST01219SE is installed, a ‘‘change in 

product’’ alternative method of compliance 

(AMOC) approval request is not necessary to 

comply with the requirements of 14 CFR 

39.17. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 53, Fuselage. 

(e) Unsafe Condition 

This AD was prompted by reports of 

additional cracking in the horizontal and 

vertical chem-milled step locations outside of 

those identified in AD 2013–18–08. The FAA 

is issuing this AD to address fatigue cracking 

of the skin panels, which could result in 

sudden fracture and failure of the skin panels 

of the fuselage, and consequent rapid 

decompression of the airplane. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions for Group 1 Through 25 

Airplanes 

For airplanes identified as Group 1 through 

25 in Boeing Alert Service Bulletin 737– 

53A1346, dated March 27, 2020, except as 

specified in paragraph (h) of this AD: At the 

applicable times specified in paragraph 1.E., 

‘‘Compliance,’’ of Boeing Alert Service 

Bulletin 737–53A1346, dated March 27, 

2020, do all applicable actions identified as 

‘‘RC’’ (required for compliance) in, and in 

accordance with, the Accomplishment 

Instructions of Boeing Alert Service Bulletin 

737–53A1346, dated March 27, 2020. Actions 

identified as terminating action in Boeing 

Alert Service Bulletin 737–53A1346, dated 

March 27, 2020, terminate the applicable 

required actions of this AD, provided the 

terminating action is done in accordance 

with the Accomplishment Instructions of 

Boeing Alert Service Bulletin 737–53A1346, 

dated March 27, 2020. 

(h) Exceptions to Service Information 

Specifications 

(1) Where Boeing Alert Service Bulletin 

737–53A1346, dated March 27, 2020, uses 

the phrase ‘‘the original issue date of this 

service bulletin,’’ this AD requires using ‘‘the 

effective date of this AD.’’ 

(2) Where Boeing Alert Service Bulletin 

737–53A1346, dated March 27, 2020, 

specifies contacting Boeing for repair 

instructions, this AD requires doing the 

repair before further flight using a method 

approved in accordance with the procedures 

specified in paragraph (j) of this AD. 

(i) Required Actions for Group 26 Airplanes 

For airplanes identified as Group 26 in 

Alert Service Bulletin 737–53A1346, dated 

March 27, 2020: Within 120 days after the 

effective date of this AD, inspect the fuselage 

skin along certain chem-milled lines for 

cracks, using a method approved in 

accordance with the procedures specified in 

paragraph (j) of this AD. 

(j) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, Los Angeles ACO 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 (k) of this 

AD. Information may be emailed to: 9-ANMLAACO-AMOC-Requests@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. 

(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, Los Angeles ACO 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. 

(4) AMOCs approved previously for AD 

2013–18–08 are approved as AMOCs for the 

corresponding provisions of Boeing Alert 

Service Bulletin 737–53A1346, dated March 

27, 2020, which are required by paragraph (g) 

of this AD. 

(5) For service information that contains 

steps that are labeled as Required for 

Compliance (RC), the provisions of 

paragraphs (j)(5)(i) and (ii) of this AD apply. 

(i) The steps labeled as RC, including 

substeps under an RC step and any figures 

identified in an RC step, must be done to 

comply with the AD. If a step or substep is 

labeled ‘‘RC Exempt,’’ then the RC 

requirement is removed from that step or 

substep. An AMOC is required for any 

deviations to RC steps, including substeps 

and identified figures. 

(ii) Steps not labeled as RC may be 

deviated from using accepted methods in 

accordance with the operator’s maintenance 

or inspection program without obtaining 

approval of an AMOC, provided the RC steps, 

including substeps and identified figures, can 

still be done as specified, and the airplane 

can be put back in an airworthy condition. 

(k) Related Information 

For more information about this AD, 

contact James Guo, Aerospace Engineer, 

Airframe Section, FAA, Los Angeles ACO 

Branch, 3960 Paramount Boulevard, 

Lakewood, CA 90712–4137; phone: 562–627– 

5357; fax: 562–627–5210; email: james.guo@

faa.gov. 

(l) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference 

(IBR) 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 the AD specifies otherwise. 

(i) Boeing Alert Service Bulletin 737– 

53A1346, dated March 27, 2020. 

(ii) [Reserved] 

(3) For service information 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; internet https://

www.myboeingfleet.com. 

(4) You may view this 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. 

Federal Register / Vol. 85, No. 245 / Monday, December 21, 2020 / Rules and Regulations 82899 

(5) You may view this service information 

that is incorporated by reference at the 

National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, 

email fedreg.legal@nara.gov, or go to: https:// 

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

Issued on December 7, 2020. 

Ross Landes, 

Deputy Director for Regulatory Operations, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2020–28029 Filed 12–18–20; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2020–0729; Project 

Identifier AD–2020–00620–E; Amendment 

39–21355; AD 2020–25–13] 

RIN 2120–AA64 

Airworthiness Directives; CFM 

International, S.A. Turbofan Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

CFM International, S.A. (CFM) 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 model 

turbofan engines. This AD was 

prompted by an investigation by CFM 

that showed a subsurface anomaly in a 

part manufactured using the same 

material as the LEAP–1A high-pressure 

turbine (HPT) stage 2 disk. This AD 

requires an ultrasonic inspection (UI) of 

the HPT stage 2 disk and replacement of 

any HPT stage 2 disk that fails the UI 

with a part eligible for installation. The 

FAA is issuing this AD to address the 

unsafe condition on these products. 

DATES: This AD is effective January 25, 

2021. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of January 25, 2021. 

ADDRESSES: For service information 

identified in this final rule, 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 (781) 238–7759. It is also available 

at https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2020–0729. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2020–0729; 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. 

FOR FURTHER INFORMATION CONTACT: 

Christopher McGuire, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 

District Avenue, Burlington, MA 01803; 

phone: (781) 238–7120; fax: (781) 238– 

7199; email: Chris.McGuire@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 certain CFM International, S.A. 

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 model turbofan engines. The 

NPRM published in the Federal 

Register on July 24, 2020 (85 FR 44798). 

The NPRM was prompted by an 

investigation by CFM that showed a 

subsurface anomaly in a part 

manufactured using the same material 

as the LEAP–1A HPT stage 2 disk. In the 

NPRM, the FAA proposed to require an 

UI of the HPT stage 2 disk and 

replacement of any HPT stage 2 disk 

that fails the UI with a part eligible for 

installation. The FAA is issuing this AD 

to address the unsafe condition on these 

products. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received comments from 

one commenter, the Air Line Pilots 

Association, International. The 

commenter supported the NPRM 

without change. 

Conclusion 

The FAA reviewed the relevant data, 

considered the comment received, and 

determined that air safety requires 

adopting the AD as proposed. 

Accordingly, the FAA is issuing this AD 

to address the unsafe condition on these 

products. Except for minor editorial 

changes, this AD is adopted as proposed 

in the NPRM. 

Related Service Information Under 1 

CFR part 51 

The FAA reviewed CFM Service 

Bulletin LEAP–1A–72–00–0405–01A– 

930A–D, Issue 001, dated March 5, 

2020. The Service Bulletin specifies 

procedures for performing an UI of the 

HPT stage 2 disk. 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. 

Costs of Compliance 

The FAA estimates that this AD 

affects 148 engines installed on 

airplanes of U.S. registry. 

The FAA estimates the following 

costs to comply with this AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

UI of HPT stage 2 disk ................................... 8 work-hours × $85 per hour = $680 ............. $0 $680 $100,640 

The FAA estimates the following 

costs to do any necessary replacements 

that would be required based on the 

results of the inspection. The agency has 

no way of determining the number of 

aircraft that might need these 

replacements.