Federal Register / Vol. 88, No. 222 / Monday, November 20, 2023 / Rules and Regulations 80575 

Issued on October 25, 2023. 

Caitlin Locke, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2023–25524 Filed 11–17–23; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–1637; Project 

Identifier MCAI–2023–00184–E; Amendment 

39–22588; AD 2023–22–04] 

RIN 2120–AA64 

Airworthiness Directives; Rolls-Royce 

Deutschland Ltd & Co KG Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for all 

Rolls-Royce Deutschland Ltd & Co KG 

(RRD) Model Trent 1000–A2, Trent 

1000–AE2, Trent 1000–C2, Trent 1000– 

CE2, Trent 1000–D2, Trent 1000–E2, 

Trent 1000–G2, Trent 1000–H2, Trent 

1000–J2, Trent 1000–K2, and Trent 

1000–L2 engines. This AD was 

prompted by reports of cracking and 

separation of certain low-pressure 

turbine (LPT) stage 1 blade assemblies. 

This AD requires initial and repetitive 

inspections of affected LPT stage 1 blade 

assemblies for cracking or separation 

and, depending on the results of the 

inspections, reduction of the inspection 

interval or replacement of the LPT stage 

1 blade set and disk, 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 December 

26, 2023. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of December 26, 2023. 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2023–1637; 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 mandatory 

continuing airworthiness information 

(MCAI), 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 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. 

• 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–2023–1637. 

FOR FURTHER INFORMATION CONTACT: 

Sungmo Cho, Aviation Safety Engineer, 

FAA, 2200 South 216th Street, Des 

Moines, WA 98198; phone: (781) 238– 

7241; email: sungmo.d.cho@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 all RRD Model Trent 1000–A2, 

Trent 1000–AE2, Trent 1000–C2, Trent 

1000–CE2, Trent 1000–D2, Trent 1000– 

E2, Trent 1000–G2, Trent 1000–H2, 

Trent 1000–J2, Trent 1000–K2, and 

Trent 1000–L2 engines. The NPRM 

published in the Federal Register on 

July 31, 2023 (88 FR 49361). The NPRM 

was prompted by EASA AD 2023–0027, 

dated January 31, 2023 (EASA AD 

2023–0027) (also referred to as the 

MCAI) issued by EASA, which is the 

Technical Agent for the Member States 

of the European Union. The MCAI states 

that manufacturer inspections detected 

cracking and separation of blade pairs in 

the weld region of certain LPT stage 1 

blade assemblies. A blade assembly 

consists of a pair of blades welded 

together at the outer shroud. There are 

85 LPT stage 1 blade assemblies in one 

set. Such cracking and separation could 

cause failure of affected parts and 

damage to the LPT module. 

You may examine the MCAI in the 

AD docket at regulations.gov under 

Docket No. FAA–2023–1637. 

In the NPRM, the FAA proposed to 

require initial and repetitive inspections 

of affected LPT stage 1 blade assemblies 

for cracking or separation and, 

depending on the results of the 

inspections, reduction of the inspection 

interval or replacement of the LPT stage 

1 blade set and disk. The FAA is issuing 

this AD to address the unsafe condition 

on these products. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received one comment from 

The Boeing Company (Boeing). Boeing 

supported the NPRM without change. 

Conclusion 

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 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 EASA AD 2023– 

0027, which specifies procedures for 

inspection of affected LPT stage 1 blade 

assemblies and replacement of the LPT 

stage 1 blade set and disk. EASA AD 

2023–0027 also specifies a reduction of 

the repetitive inspection intervals if 

cracking or separation is detected and 

meets certain criteria. 

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 ADDRESSES. 

Costs of Compliance 

The FAA estimates that this AD 

affects 26 engines installed on airplanes 

of U.S. registry. 

The FAA estimates the following 

costs to comply with this AD: 


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80576 Federal Register / Vol. 88, No. 222 / Monday, November 20, 2023 / Rules and Regulations 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Inspection LPT stage 1 blade assemblies ...... 4 work-hours × $85 per hour = $340 ............. $0 $340 $8,840 

The FAA estimates the following 

costs to do any necessary replacements 

that are required based on the results of 

the inspection. The agency has no way 

of determining the number of engines 

that might need these replacements: 

ON-CONDITION COSTS

Action Labor cost Parts cost Cost per 

product 

Replace LPT stage 1 blade set and disk ..................... 4 work-hours × $85 per hour = $340 ........................... $720,000 $720,340 

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: 

2023–22–04 Rolls-Royce Deutschland Ltd & 

Co KG: Amendment 39–22588; Docket 

No. FAA–2023–1637; Project Identifier 

MCAI–2023–00184–E. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective December 26, 2023. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Rolls-Royce 

Deutschland Ltd & Co KG (RRD) Model Trent 

1000–A2, Trent 1000–AE2, Trent 1000–C2, 

Trent 1000–CE2, Trent 1000–D2, Trent 1000– 

E2, Trent 1000–G2, Trent 1000–H2, Trent 

1000–J2, Trent 1000–K2, and Trent 1000–L2 

engines. 

(d) Subject 

Joint Aircraft Service Component (JASC) 

Code 7250, Turbine Section. 

(e) Unsafe Condition 

This AD was prompted by reports of 

cracking and separation of certain lowpressure turbine (LPT) stage 1 blade 

assemblies. The FAA is issuing this AD to 

prevent failure of the LPT stage 1 blades. The 

unsafe condition, if not addressed, could 

result in high energy debris release, damage 

to the airplane, and reduced control of the 

airplane. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

Except as specified in paragraphs (h) and 

(i) of this AD: Perform all required actions 

within the compliance times specified in, 

and in accordance with, European Union 

Aviation Safety Agency AD 2023–0027, dated 

January 31, 2023 (EASA AD 2023–0027). 

(h) Exceptions to EASA AD 2023–0027 

(1) Where EASA AD 2023–0027 specifies 

compliance from its effective date, this AD 

requires using the effective date of this AD. 

(2) This AD does not adopt the Remarks 

paragraph of EASA AD 2023–0027. 

(3) Where the service information 

referenced in EASA AD 2023–0027 specifies 

discarding the removed LP turbine stage 1 

blade set, this AD requires removing the 

affected part from service. 

(4) Where the service information 

referenced in EASA AD 2023–0027 specifies 

to quarantine the removed LP turbine stage 

1 rotor disc, this AD requires removing the 

affected part from service. 

(i) No Reporting Requirement 

Although the service information 

referenced in EASA AD 2023–0027 specifies 

to submit certain information to the 

manufacturer, this AD does not include that 

requirement. 

(j) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, AIR–520 Continued 

Operational Safety Branch, FAA, has the 

authority to approve AMOCs for this AD, if 

requested using the procedures found in 14 

CFR 39.19. In accordance with 14 CFR 39.19, 

send your request to your principal inspector 

or local Flight Standards District Office, as 

appropriate. If sending information directly 

to the manager of the AIR–520 Continued 

Operational Safety Branch, send it to the 

attention of the person identified in 

paragraph (k) of this AD and email to: ANEAD-AMOC@faa.gov. 


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Federal Register / Vol. 88, No. 222 / Monday, November 20, 2023 / Rules and Regulations 80577 

(2) Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the local flight standards district office/ 

certificate holding district office. 

(k) Additional Information 

For more information about this AD, 

contact Sungmo Cho, Aviation Safety 

Engineer, FAA, 2200 South 216th Street, Des 

Moines, WA 98198; phone: (781) 238–7241; 

email: sungmo.d.cho@faa.gov. 

(l) 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 the AD specifies otherwise. 

(i) European Union Aviation Safety Agency 

(EASA) AD 2023–0027, dated January 31, 

2023. 

(ii) [Reserved] 

(3) For EASA AD 2023–0027, 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-locations or email fr.inspection@nara.gov. 

Issued on October 27, 2023. 

Caitlin Locke, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2023–25521 Filed 11–17–23; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2022–1311; Project 

Identifier MCAI–2022–00624–E; Amendment 

39–22587; AD 2023–22–03] 

RIN 2120–AA64 

Airworthiness Directives; Safran 

Helicopter Engines, S.A. (Type 

Certificate Previously Held by 

Turbomeca, S.A.) Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is superseding 

Airworthiness Directive (AD) 2021–08– 

02 for all Safran Helicopter Engines, 

S.A. (Safran) (type certificate previously 

held by Turbomeca, S.A.) Model Arriel 

2D and Arriel 2E engines. AD 2021–08– 

02 required replacing certain critical 

parts before reaching their published inservice life limits, performing scheduled 

maintenance tasks before reaching their 

published periodicity, and performing 

unscheduled maintenance tasks when 

the engine meets certain conditions. 

Since the FAA issued AD 2021–08–02, 

Safran has revised the airworthiness 

limitation section (ALS) of the existing 

maintenance and overhaul manuals, 

introducing new and more restrictive 

instructions and maintenance tasks, 

which prompted this AD action. This 

AD requires updating the ALS of the 

existing engine maintenance manual 

(EMM) or instructions for continued 

airworthiness (ICA) and the existing 

approved maintenance or inspection 

program, as applicable, by incorporating 

the actions and associated thresholds 

and intervals, including life limits, as 

specified in a European Union Aviation 

Safety Agency (EASA) AD, which is 

incorporated by reference. The FAA is 

proposing this AD to address the unsafe 

condition on these products. 

DATES: This AD is effective December 

26, 2023. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of December 26, 2023. 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2022–1311; 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 mandatory 

continuing airworthiness information 

(MCAI), 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 EASA, KonradAdenauer-Ufer 3, 50668 Cologne, 

Germany; phone: +49 221 8999 000; 

email: ADs@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–2022–1311. 

• 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: 

Kevin Clark, Aviation Safety Engineer, 

FAA, 1600 Stewart Avenue, Suite 410, 

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

7088; email: kevin.m.clark@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 to supersede AD 2021–08–02, 

Amendment 39–21496 (86 FR 26651, 

May 17, 2021), (AD 2021–08–02). AD 

2021–08–02 applied to all Safran Model 

Arriel 2D and Arriel 2E engines. AD 

2021–08–02 required replacing certain 

critical parts before reaching their 

published in-service life limits, 

performing scheduled maintenance 

tasks before reaching their published 

periodicity, and performing 

unscheduled maintenance tasks when 

the engine meets certain conditions. As 

a terminating action, AD 2021–08–02 

required operators to revise the ALS of 

their existing approved aircraft 

maintenance program (AMP) by 

incorporating the revised airworthiness 

limitations and maintenance tasks. The 

FAA issued AD 2021–08–02 to prevent 

failure of the engine. 

The NPRM published in the Federal 

Register on October 31, 2022 (87 FR 

65535). The NPRM was prompted by 

EASA AD 2022–0083, dated May 11, 

2022 (EASA AD 2022–0083), issued by 

EASA, which is the Technical Agent for 

the Member States of the European 

Union (referred to after this as the 

MCAI), which supersedes EASA AD 

2018–0273, dated December 13, 2018 

(EASA AD 2018–0273). The MCAI states 

that the manufacturer published a 

revised ALS introducing new and more 

restrictive maintenance tasks and 

airworthiness limitations. These new or 

more restrictive maintenance tasks and 

airworthiness limitations include initial 

and repetitive inspections for clogging 

of the power turbine air pressurization 

pipe. 

You may examine the MCAI in the 

AD docket at regulations.gov under 

Docket No. FAA–2022–1311. 

In the NPRM, the FAA proposed to 

require revising the ALS of the 

operator’s existing approved 

maintenance or inspection program, as 

applicable, to incorporate new and more 

restrictive airworthiness limitations. 

The FAA issued a supplemental 

notice of proposed rulemaking (SNPRM) 

to amend 14 CFR part 39 to supersede 

AD 2021–08–02. The SNPRM published 

in the Federal Register on July 14, 2023 

(88 FR 45109). The SNPRM was 


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