6450 Federal Register / Vol. 89, No. 22 / Thursday, February 1, 2024 / Proposed Rules 

Issued in Kansas City, Missouri, on January 

29, 2024. 

Patrick R. Mullen, 

Manager, Technical Innovation Policy 

Branch, Policy and Innovation Division, 

Aircraft Certification Service. 

[FR Doc. 2024–02043 Filed 1–29–24; 5:00 pm] 

BILLING CODE 4910–13–C 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–0043; Project 

Identifier MCAI–2023–00985–E] 

RIN 2120–AA64 

Airworthiness Directives; Rolls-Royce 

Deutschland Ltd & Co KG 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 

Rolls-Royce Deutschland Ltd & Co KG 

(RRD) Model Trent 1000–A, Trent 1000– 

AE, Trent 1000–C, Trent 1000–CE, Trent 

1000–D, Trent 1000–E, Trent 1000–G, 

and Trent 1000–H engines. This 

proposed AD was prompted by reports 

of cracking and separation of certain 

low-pressure turbine (LPT) stage 1 blade 

assemblies. This proposed AD would 

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. This proposed AD 

would also prohibit the installation of 

an LPT disk or blade set assembly 

unless it is considered a serviceable 

part, as specified in a European Union 

Aviation Safety Agency (EASA) AD, 

which is proposed for incorporation by 

reference. The FAA is proposing this 

AD to address the unsafe condition on 

these products. 

DATES: The FAA must receive comments 

on this NPRM by March 18, 2024. 

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–2024–0043; 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. 

• 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: 

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: 

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–2024–0043; Project Identifier 

MCAI–2023–00985–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 

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 Sungmo Cho, Aviation 

Safety Engineer, FAA, 2200 South 216th 

Street, Des Moines, WA 98198. Any 

commentary that the FAA receives 

which is not specifically designated as 

CBI will be placed in the public docket 

for this rulemaking. 

Background 

EASA, which is the Technical Agent 

for the Member States of the European 

Union, has issued EASA AD 2023–0165, 

dated August 22, 2023 (EASA AD 2023– 

0165) (also referred to as the MCAI), to 

address an unsafe condition for all RRD 

Model Trent 1000–A, Trent 1000–AE, 

Trent 1000–C, Trent 1000–CE, Trent 

1000–D, Trent 1000–E, Trent 1000–G, 

and Trent 1000–H engines. 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–2024–0043. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed EASA AD 2023– 

0165, which specifies procedures for 

inspection of affected LPT stage 1 blade 

assembly outer shrouds and 

replacement of the LPT stage 1 blade set 

and disk. EASA AD 2023–0165 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. 


ddrumheller on DSK120RN23PROD with PROPOSALS1
Federal Register / Vol. 89, No. 22 / Thursday, February 1, 2024 / Proposed Rules 6451 

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 in other products of 

the same type design. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

accomplishing the actions specified in 

EASA AD 2023–0165 described 

previously, except for any differences 

identified as exceptions in the 

regulatory text of this proposed AD. 

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 EASA AD 

2023–0165 by reference in the FAA final 

rule. This proposed AD would, 

therefore, require compliance with 

EASA AD 2023–0165 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 2023–0165. 

Service information required by the 

EASA AD for compliance will be 

available at regulations.gov under 

Docket No. FAA–2024–0043 after the 

FAA final rule is published. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 28 

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 

Inspect LPT stage 1 blade outer shroud ........ 4 work-hours × $85 per hour = $340 ............. $0 $340 $9,520 

The FAA estimates the following 

costs to do any necessary replacements 

that would be required based on the 

results of the proposed 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 .................................... 10 work-hours × $85 per hour = $850 ......................... $466,480 $467,330 

Replace LPT stage 1 disk ............................................ 10 work-hours × $85 per hour = $850 ......................... 256,908 257,758 

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: 


ddrumheller on DSK120RN23PROD with PROPOSALS1
6452 Federal Register / Vol. 89, No. 22 / Thursday, February 1, 2024 / Proposed Rules 

Rolls-Royce Deutschland Ltd & Co KG: 

Docket No. FAA–2024–0043; Project 

Identifier MCAI–2023–00985–E. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by March 18, 

2024. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Rolls-Royce 

Deutschland Ltd & Co KG Model Trent 1000; 

Rolls-Royce Deutschland Ltd & Co KG Trent 

1000–A, Trent 1000–AE, Trent 1000–C, Trent 

1000–CE, Trent 1000–D, Trent 1000–E, Trent 

1000–G, and Trent 1000–H engines. 

(d) Subject 

Joint Aircraft System 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 2023–0165, dated 

August 22, 2023 (EASA AD 2023–0165). 

(h) Exceptions to EASA AD 2023–0165 

(1) Where EASA AD 2023–0165 refers to 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 2023–0165. 

(3) Where the service information 

referenced in EASA AD 2023–0165 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 2023–0165 specifies 

to quarantine the removed LP turbine stage 

1 rotor disk, this AD requires removing the 

affected part from service. 

(i) No Reporting Requirement 

Although the service information 

referenced in EASA AD 2023–0165 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. 

(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 this AD specifies otherwise. 

(i) European Union Aviation Safety Agency 

(EASA) AD 2023–0165, dated August 22, 

2023. 

(ii) [Reserved] 

(3) For EASA AD 2023–0165, 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 material 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. 

(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 January 26, 2024. 

Michael Linegang, 

Acting Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2024–01976 Filed 1–31–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–0044; Project 

Identifier MCAI–2023–00629–A] 

RIN 2120–AA64 

Airworthiness Directives; BrittenNorman Aircraft, Ltd. 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 all 

Britten-Norman Aircraft, Ltd. Model 

BN–2, BN–2A, BN–2A–2, BN–2A–3, 

BN–2A–6, BN–2A–8, BN–2A–9, BN– 

2A–20, BN–2A–21, BN–2A–26, BN–2A– 

27, BN–2B–20, BN–2B–21, BN–2B–26, 

BN–2B27, BN–2T, BN2T–4R, and 

BN2T–4S airplanes; and Model BN2A 

MK. III, BN2A MK. III–2, and BN2A 

MK. III–3 airplanes. This proposed AD 

was prompted by reports of electrical 

cable (Koiled Kord) and flight control 

cables interference with the control 

column. This proposed AD would 

require inspecting for interference 

between the control column, rudder 

pedal adjuster cable, and any wiring 

(including the Koiled Kord) 

concurrently with performing a flight 

control full and free movement 

inspection, and taking corrective actions 

if necessary. The FAA is proposing this 

AD to address the unsafe condition on 

these products. 

DATES: The FAA must receive comments 

on this NPRM by March 18, 2024. 

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–2024–0044; 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 


ddrumheller on DSK120RN23PROD with PROPOSALS1