73778 Federal Register / Vol. 88, No. 207 / Friday, October 27, 2023 / Proposed Rules 

responsible Flight Standards Office, as 

appropriate. If sending information directly 

to the International Validation Branch, send 

it to the attention of the person identified in 

paragraph (j)(2) of this AD. Information may 

be emailed to: 9-AVS-AIR-730-AMOC@

faa.gov. Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the responsible Flight Standards Office. 

(2) Contacting the Manufacturer: For any 

requirement in this AD to obtain instructions 

from a manufacturer, the instructions must 

be accomplished using a method approved 

by the Manager, International Validation 

Branch, FAA; or Transport Canada; or De 

Havilland Aircraft of Canada Limited’s 

Transport Canada Design Approval 

Organization (DAO). If approved by the DAO, 

the approval must include the DAOauthorized signature. 

(j) Additional Information 

(1) Refer to Transport Canada AD CF– 

2022–59, dated October 27, 2022, for related 

information. This Transport Canada AD may 

be found in the AD docket at regulations.gov 

under Docket No. FAA–2023–2137. 

(2) For more information about this AD, 

contact Fatin Saumik, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; telephone: 516– 

228–7300; email: 9-avs-nyaco-cos@faa.gov. 

(k) Material Incorporated by Reference 

None. 

Issued on October 20, 2023. 

Ross Landes, 

Deputy Director for Regulatory Operations, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2023–23723 Filed 10–26–23; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–2002; Project 

Identifier MCAI–2023–00176–E] 

RIN 2120–AA64 

Airworthiness Directives; GE Aviation 

Czech s.r.o. (Type Certificate 

Previously Held by WALTER Engines 

a.s., Walter a.s., and MOTORLET a.s.) 

Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to 

supersede airworthiness directive (AD) 

2021–13–07, which applies to all GE 

Aviation Czech s.r.o. (GEAC) (type 

certificate previously held by WALTER 

Engine a.s., Walter a.s., and MOTORLET 

a.s.) Model M601D–11, M601E–11, 

M601E–11A, M601E–11AS, M601E– 

11S, and M601F engines. AD 2021–13– 

07 requires recalculating the life of 

critical parts and, depending on the 

results of the recalculation, replacing 

these critical parts. AD 2021–13–07 also 

requires replacing a certain compressor 

case. Since the FAA issued AD 2021– 

13–07, the manufacturer published the 

airworthiness limitations section (ALS) 

of the existing engine maintenance 

manual (EMM), which includes the 

calculations for the life of critical parts 

addressed by AD 2021–13–07 and 

prompted this proposed AD. This 

proposed AD would continue to require 

the replacement of a certain centrifugal 

compressor case. This proposed AD 

would also include an additional part 

number as an option for the replacement 

and would limit the applicability of the 

proposed AD, as specified in a European 

Union Aviation Safety Agency (EASA) 

AD, which is proposed for incorporation 

by reference (IBR). The FAA is 

proposing this AD to address the unsafe 

condition on these products. 

DATES: The FAA must receive comments 

on this NPRM by December 11, 2023. 

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–2023–2002; or in person at 

Docket Operations between 9 a.m. and 

5 p.m., Monday through Friday, except 

Federal holidays. The AD docket 

contains this NPRM, the mandatory 

continuing airworthiness information 

(MCAI), any comments received, and 

other information. The street address for 

Docket Operations is listed above. 

Material Incorporated by Reference: 

• For service information identified 

in this NPRM, contact EASA, KonradAdenauer-Ufer 3, 50668 Cologne, 

Germany; phone: +49 221 8999 000; 

email: ADs@easa.europa.eu; website: 

easa.europa.eu. You may find this 

material on the EASA website at 

ad.easa.europa.eu. It is also available at 

regulations.gov under Docket No. FAA– 

2023–2002. 

• 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. 

FOR FURTHER INFORMATION CONTACT: 

Barbara Caufield, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 11590; phone: 

(781) 238–7146; email: 

barbara.caufield@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–2023–2002; Project Identifier 

MCAI–2023–00176–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 the 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 Barbara Caufield, 

Aviation Safety Engineer, FAA, 1600 

Stewart Avenue, Suite 410, Westbury, 

NY 11590. Any commentary that the 


ddrumheller on DSK120RN23PROD with PROPOSALS1
Federal Register / Vol. 88, No. 207 / Friday, October 27, 2023 / Proposed Rules 73779 

FAA receives which is not specifically 

designated as CBI will be placed in the 

public docket for this rulemaking. 

Background 

The FAA issued AD 2021–13–07, 

Amendment 39–21612 (86 FR 31601, 

June 15, 2021) (AD 2021–13–07), for all 

GEAC Model M601D–11, M601E–11, 

M601E–11A, M601E–11AS, M601E– 

11S, and M601F engines. AD 2021–13– 

07 was prompted by an MCAI originated 

by EASA, which is the Technical Agent 

for the Member States of the European 

Union. EASA issued EASA Emergency 

AD 2021–0125–E, dated May 7, 2021 

(EASA Emergency AD 2021–0125–E) to 

address an unsafe condition identified 

as the manufacturer finding errors in the 

ALS of the existing EMM, including 

errors in the formula to determine the 

consumed equivalent flight cycles of 

critical parts and errors with certain part 

numbers. The manufacturer also 

determined that the life limit of a 

certain compressor case installed on 

Model M601E engines is not listed in 

the ALS of the applicable EMM. 

AD 2021–13–07 requires recalculating 

the life of critical parts and, depending 

on the results of the recalculation, 

replacing critical parts. AD 2021–13–07 

also requires replacing a certain 

compressor case. The FAA issued AD 

2021–13–07 to prevent the failure of the 

engine. 

Actions Since AD 2021–13–07 Was 

Issued 

Since the FAA issued AD 2021–13– 

07, EASA revised EASA Emergency AD 

2021–0125–E and issued EASA AD 

2021–0125R1, dated January 30, 2023 

(EASA AD 2021–0125R1) (referred to 

after this as the MCAI). The MCAI states 

that the manufacturer published the 

ALS, which incorporates certain 

requirements addressed by EASA 

Emergency AD 2021–0125–E, and that 

EASA published EASA AD 2023–0020, 

dated January 23, 2023 (EASA AD 

2023–0020), which requires 

accomplishment of the actions specified 

in the ALS. The MCAI limits the 

applicability to M601E engines with a 

centrifugal compressor case having part 

number M601–154.61 installed and 

removes the requirements that have 

been incorporated in the ALS. The FAA 

is addressing the actions specified in the 

ALS concurrently in a separate AD 

action. 

You may examine the MCAI in the 

AD docket at regulations.gov under 

Docket No. FAA–2023–2002. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed EASA AD 2021– 

0125R1, which specifies procedures for 

replacing the centrifugal compressor 

case, limits the applicability to certain 

M601E engines, and removes the 

requirements that have been 

incorporated in the ALS. 

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. 

FAA’s Determination 

These products have been approved 

by the aviation authority of another 

country and are approved for operation 

in the United States. Pursuant to the 

FAA’s bilateral agreement with this 

State of Design Authority, it has notified 

the FAA of the unsafe condition 

described in the MCAI referenced 

above. The FAA is issuing this NPRM 

after determining that the unsafe 

condition described previously is likely 

to exist or develop on other products of 

the same type design. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

accomplishing the actions specified in 

the MCAI described previously, except 

for any differences identified as 

exceptions in the regulatory text of this 

proposed AD and the ‘‘Differences 

Between This Proposed AD and the 

MCAI.’’ 

Differences Between This Proposed AD 

and the MCAI 

The MCAI applies to GEAC Model 

M601E engines, and this AD does not 

because they do not have an FAA type 

certificate. 

Explanation of Required Compliance 

Information 

In the FAA’s ongoing efforts to 

improve the efficiency of the AD 

process, the FAA developed a process to 

use some civil aviation authority (CAA) 

ADs as the primary source of 

information for compliance with 

requirements for corresponding FAA 

ADs. The FAA has since coordinated 

with other manufacturers and CAAs to 

use this process. As a result, the FAA 

proposes to incorporate by reference 

EASA AD 2021–0125R1 in the FAA 

final rule. This proposed AD would, 

therefore, require compliance with 

EASA AD 2021–0125R1 in its entirety 

through that incorporation, except for 

any differences identified as exceptions 

in the regulatory text of this proposed 

AD. Using common terms that are the 

same as the heading of a particular 

section in the EASA AD does not mean 

that operators need comply only with 

that section. For example, where the AD 

requirement refers to ‘‘all required 

actions within the compliance times,’’ 

compliance with this AD requirement is 

not limited to the section titled 

‘‘Required Action(s) and Compliance 

Time(s)’’ in EASA AD 2021–0125R1. 

Service information required by the 

EASA AD for compliance will be 

available at regulations.gov by under 

Docket No. FAA–2023–2002 after the 

FAA final rule is published. 

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 

Recalculate centrifugal compressor case 

equivalent flight cycles.

1 work-hour × $85 per hour = $85 ................. $0 $85 $1,105 

Replace centrifugal compressor case ............ 10 work-hours × $85 per hour = $850 ........... 65,000 65,850 856,050 

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 


ddrumheller on DSK120RN23PROD with PROPOSALS1
73780 Federal Register / Vol. 88, No. 207 / Friday, October 27, 2023 / Proposed Rules 

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 that the 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: 

■ a. Removing Airworthiness Directive 

2021–13–07, Amendment 39–21612 (86 

FR 31601, June 15, 2021); and 

■ b. Adding the following new 

airworthiness directive: 

GE Aviation Czech s.r.o. (Type Certificate 

Previously held by WALTER Engines 

a.s., Walter a.s., and MOTORLET a.s.): 

Docket No. FAA–2023–2002; Project 

Identifier MCAI–2023–00176–E. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by December 11, 

2023. 

(b) Affected ADs 

This AD replaces AD 2021–13–07, 

Amendment 39–21612 (86 FR 31601, June 

15, 2021). 

(c) Applicability 

This AD applies to GE Aviation Czech 

s.r.o. (type certificate previously held by 

WALTER Engines a.s., Walter a.s., and 

MOTORLET a.s.) Model M601E–11, M601E– 

11A, M601E–11AS, and M601E–11S engines 

with a centrifugal compressor case having 

part number (P/N) M601–154.61 installed. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 7230, Turbine Engine Compressor 

Section. 

(e) Unsafe Condition 

This AD was prompted by the 

manufacturer determining that the life limit 

of a compressor case having P/N M601– 

154.61 is not listed in the airworthiness 

limitations section of the existing engine 

maintenance manual. The FAA is issuing this 

AD to prevent the failure of the engine. The 

unsafe condition, if not addressed, could 

result in uncontained release of a critical 

part, 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 

Except as specified in paragraph (h) of this 

AD: Perform all required actions within the 

compliance times specified in, and in 

accordance with, European Union Aviation 

Safety Agency (EASA) AD 2021–0125R1, 

dated January 30, 2023 (EASA AD 2021– 

0125R1). 

(h) Exceptions to EASA AD 2021–0125R1 

(1) Where EASA AD 2021–0125R1 refers to 

May 11, 2021 (the effective date of EASA 

Emergency AD 2021–0125–E, dated May 7, 

2021), this AD requires using June 30, 2021 

(the effective date of AD 2021–13–07). 

(2) This AD does not adopt the Remarks 

paragraph of EASA AD 2021–0125R1. 

(i) 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 (j) 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. 

(j) Additional Information 

For more information about this AD, 

contact Barbara Caufield, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; phone: (781) 238– 

7146; email: barbara.caufield@faa.gov. 

(k) 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) European Union Aviation Safety Agency 

(EASA) AD 2021–0125R1, dated January 30, 

2023. 

(ii) [Reserved] 

(3) For EASA AD 2021–0125R1, contact 

EASA, Konrad-Adenauer-Ufer 3, 50668 

Cologne, Germany; phone: +49 221 8999 000; 

email: ADs@easa.europa.eu; website: 

easa.europa.eu. You may find this EASA AD 

on the EASA website at ad.easa.europa.eu. 

(4) You may view this service information 

at 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-locationsoremailfr.inspection@nara.gov. 

Issued on October 19, 2023. 

Ross Landes, 

Deputy Director for Regulatory Operations, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2023–23634 Filed 10–26–23; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–2005; Project 

Identifier AD–2022–01523–A] 

RIN 2120–AA64 

Airworthiness Directives; WACO 

Classic Aircraft Corporation 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 WACO Classic Aircraft 

Corporation Model 2T–1A–2 airplanes. 

This proposed AD was prompted by 

reports of multiple types of cracks at the 

leading edge former ribs and trailing 

edge former ribs in the upper wing 


ddrumheller on DSK120RN23PROD with PROPOSALS1