67118 Federal Register / Vol. 88, No. 188 / Friday, September 29, 2023 / Proposed Rules 

determined that this proposed rule 

would not have a significant impact on 

a substantial number of small entities, 

because this proposed rule would apply 

only to Federal agencies, Federal 

employees, and labor organizations 

representing those employees. 

Executive Order 12866, Regulatory 

Review 

The FLRA is an independent 

regulatory agency and thus is not 

subject to the requirements of E.O. 

12866 (58 FR 51735, Sept. 30, 1993). 

Executive Order 13132, Federalism 

The FLRA is an independent 

regulatory agency and thus is not 

subject to the requirements of E.O. 

13132 (64 FR 43255, Aug. 4, 1999). 

Unfunded Mandates Reform Act of 

1995 

This proposed rule would not result 

in the expenditure by state, local, and 

tribal governments, in the aggregate, or 

by the private sector, of $100,000,000 or 

more in any one year, and it would not 

significantly or uniquely affect small 

governments. Therefore, no actions were 

deemed necessary under the provisions 

of the Unfunded Mandates Reform Act 

of 1995. 

Small Business Regulatory Enforcement 

Fairness Act of 1996 

This action is not a major rule as 

defined by section 804 of the Small 

Business Regulatory Enforcement 

Fairness Act of 1996. This proposed rule 

would not result in an annual effect on 

the economy of $100,000,000 or more; a 

major increase in costs or prices; or 

significant adverse effects on 

competition, employment, investment, 

productivity, innovation, or on the 

ability of United States-based 

companies to compete with foreignbased companies in domestic and 

export markets. 

Paperwork Reduction Act of 1995 

The proposed rule contains no 

additional information collection or 

record-keeping requirements under the 

Paperwork Reduction Act of 1995, 44 

U.S.C. 3501, et seq. 

List of Subjects in 5 CFR Part 2429 

Administrative practice and 

procedure, Government employees, 

Labor management relations. 

For the reasons stated in the 

preamble, the FLRA proposes to amend 

5 CFR part 2429 as follows: 

PART 2429—MISCELLANEOUS AND 

GENERAL REQUIREMENTS 

■ 1. The authority citation for part 2429 

continues to read as follows: 

Authority: 5 U.S.C. 7134; § 2429.18 also 

issued under 28 U.S.C. 2112(a). 

■ 2. Amend § 2429.24 by revising 

paragraph (a) to read as follows: 

§ 2429.24 Place and method of filing; 

acknowledgment. 

(a) Except for documents that are filed 

electronically through use of the eFiling 

system on the FLRA’s website at 

www.flra.gov, anyone who files a 

document with the Authority (as 

distinguished from the General Counsel, 

a Regional Director, or an 

Administrative Law Judge) must file 

that document with the Chief, Case 

Intake and Publication, Federal Labor 

Relations Authority, Docket Room, Suite 

200, 1400 K Street NW, Washington, DC 

20424–0001 (telephone: (771) 444– 

5805). To file documents by personal 

delivery, you must schedule an 

appointment at least one business day 

in advance by calling the telephone 

number in the previous sentence. 

Personal delivery is accepted by 

appointment Monday through Friday 

(except federal holidays). If you file 

documents electronically through use of 

the FLRA’s eFiling system, then you 

may file those documents on any 

calendar day—including Saturdays, 

Sundays, and federal legal holidays— 

and the Authority will consider those 

documents filed on a particular day if 

you file them no later than 11:59 p.m. 

on that day. Note, however, that 

although you may eFile documents on 

Saturdays, Sundays, and federal legal 

holidays, you are not required to do so. 

Also note that you may not file 

documents with the Authority by 

electronic mail (‘‘email’’). 

* * * * * 

Approved: September 26, 2023. 

Rebecca J. Osborne, 

Director of Legislative Affairs and Program 

Planning, Federal Labor Relations Authority. 

[FR Doc. 2023–21447 Filed 9–28–23; 8:45 am] 

BILLING CODE 6727–01–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–1890; Project 

Identifier MCAI–2023–00283–T] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc., 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 

Bombardier, Inc., Model BD–100–1A10 

airplanes. This proposed AD was 

prompted by reports from the supplier 

that some overheat detection sensing 

elements of the bleed air leak detection 

system were manufactured with 

insufficient salt fill, which can result in 

an inability to detect hot bleed air leaks. 

This proposed AD would require 

revising the existing airplane flight 

manual (AFM) to include procedures to 

prevent takeoff with an active bleed air 

leak annunciated while on the ground. 

This proposed AD would also require 

testing the overheat detection sensing 

elements, marking each serviceable 

sensing element with a witness mark, 

and replacing each nonserviceable part 

with a serviceable part. This proposed 

AD would also prohibit the installation 

of affected 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 November 13, 

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–2023–1890; or in person at 

Docket Operations between 9 a.m. and 

5 p.m., Monday through Friday, except 

Federal holidays. The AD docket 


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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 Bombardier service information 

identified in this NPRM, contact 

Bombardier Business Aircraft Customer 

Response Center, 400 Coˆte-Vertu Road 

West, Dorval, Que ́bec H4S 1Y9, Canada; 

telephone 514–855–2999; email: 

ac.yul@aero.bombardier.com; website: 

bombardier.com. 

• For Liebherr-Aerospace Toulouse 

SAS service information identified in 

this NPRM, contact Liebherr-Aerospace 

Toulouse SAS, 408, Avenue des EtatsUnis—B.P. 52010, 31016 Toulouse 

Cedex, France; telephone +33 

(0)5.61.35.28.28; fax +33 

(0)5.61.35.29.29; email: 

techpub.toulouse@liebherr.com; 

website: liebherr.aero. 

• You may view this service 

information at the FAA, Airworthiness 

Products Section, Operational Safety 

Branch, 2200 South 216th Street, Des 

Moines, WA. For information on the 

availability of this material at the FAA, 

call 206–231–3195. 

FOR FURTHER INFORMATION CONTACT: 

Steven Dzierzynski, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 11590; 

telephone 516–228–7300; email 9-avsnyaco-cos@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–2023–1890; Project Identifier 

MCAI–2023–00283–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 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 Steven Dzierzynski, 

Aviation Safety Engineer, FAA, 1600 

Stewart Avenue, Suite 410, Westbury, 

NY 11590; telephone 516–228–7300; 

email: 9-avs-nyaco-cos@faa.gov. Any 

commentary that the FAA receives 

which is not specifically designated as 

CBI will be placed in the public docket 

for this rulemaking. 

Background 

Transport Canada, which is the 

aviation authority for Canada, has 

issued Transport Canada AD CF–2023– 

09, dated February 14, 2023 (Transport 

Canada AD CF–2023–09) (also referred 

to after this as the MCAI), to correct an 

unsafe condition on all Bombardier, 

Inc., Model BD–100–1A10 airplanes. 

The MCAI states that Bombardier 

received reports from the supplier of the 

overheat detection sensing elements of a 

manufacturing quality escape. Some of 

the sensing elements of the bleed air 

leak detection system were 

manufactured with insufficient salt fill. 

This condition can result in an inability 

to detect hot bleed air leaks, which can 

cause damage to surrounding structures 

and systems and prevent continued safe 

flight and landing. 

The FAA is proposing this AD to 

address the unsafe condition on these 

products. You may examine the MCAI 

in the AD docket at regulations.gov 

under Docket No. FAA–2023–1890. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Liebherr Service 

Bulletin CFD–F1958–26–01, dated May 

6, 2022, which specifies part numbers 

for affected sensing elements. 

Bombardier has issued the following 

service information. This service 

information describes procedures to 

prevent the take-off of an airplane with 

an active bleed air leak annunciated 

while on the ground. These documents 

are distinct since they apply to different 

airplane models. 

• Section 05–42, Air Conditioning & 

Pressurization, Non-Normal Procedures 

Section, Bombardier Challenger 300 

AFM (Imperial Version), Publication 

No. CSP 100–1, Revision 71, dated 

November 9, 2022. (For obtaining the 

procedures for Bombardier Challenger 

300 AFM (Imperial Version), 

Publication No. CSP 100–1, use 

Document Identification No. CH 300 

AFM–I.) 

• Section 05–42, Air Conditioning & 

Pressurization, Non-Normal Procedures 

Section, Bombardier Challenger 350 

AFM, Publication No. CH 350 AFM, 

Revision 37, dated November 9, 2022. 

(For obtaining the procedures for 

Bombardier Challenger 350 AFM, 

Publication No. CH 350 AFM, use 

Document Identification No. CH 350 

AFM.) 

The FAA also reviewed Bombardier 

Service Bulletin 100–36–10, dated 

December 23, 2022; and Bombardier 

Service Bulletin 350–36–003, dated 

December 23, 2022; which specify 

procedures for testing each leak 

detection loop (LDL) sensing element 

installed on the airplane, marking each 

serviceable sensing element with a 

witness mark, and replacing each 

nonserviceable part with a serviceable 

part. These documents are distinct since 

they apply to different airplane models. 

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. 

FAA’s Determination 

This product has been approved by 

the aviation authority of another 

country, and is 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 and service 

information described 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 

revising the existing AFM to include 

procedures to prevent takeoff with an 

active bleed air leak annunciated while 

on the ground. This proposed AD would 

also require accomplishing the actions 

specified in the service information 


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67120 Federal Register / Vol. 88, No. 188 / Friday, September 29, 2023 / Proposed Rules 

already described. This proposed AD 

would also prohibit the installation of 

affected parts. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 317 

airplanes of U.S. registry. The FAA 

estimates the following costs to comply 

with this proposed AD: 

ESTIMATED COSTS FOR REQUIRED ACTIONS

Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Up to 77 work-hours × $85 per hour = $6,545 .................................................................. $0 Up to $6,545 ...... Up to $2,428,195. 

The FAA has received no definitive 

data on which to base the cost estimates 

for the on-condition actions specified in 

this proposed AD. The FAA estimates it 

would take up to 1.5 hours to replace 

one sensor. 

The FAA has included all known 

costs in its cost estimate. According to 

the manufacturer, however, some or all 

of the costs of this proposed AD may be 

covered under warranty, thereby 

reducing the cost impact on affected 

operators. 

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: 

Bombardier, Inc.: Docket No. FAA–2023– 

1890; Project Identifier MCAI–2023– 

00283–T. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by November 

13, 2023. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to all Bombardier, Inc., 

Model BD–100–1A10 airplanes, certificated 

in any category. 

(d) Subject 

Air Transport Association (ATA) of 

America Code: 36, Pneumatic. 

(e) Unsafe Condition 

This AD was prompted by reports that 

some overheat detection sensing elements of 

the bleed air leak detection system were 

manufactured with insufficient salt fill. The 

FAA is issuing this AD to address nonconforming sensing elements of the bleed air 

leak detection system. The unsafe condition, 

if not addressed, could result in an inability 

to detect hot bleed air leaks and consequent 

damage to surrounding structures and 

systems, which could prevent continued safe 

flight and landing. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Definitions 

(1) For purposes of this AD, an affected 

part is a sensing element marked with a date 

code A0448 through A2104 inclusive and 

having an LTS/Kidde part number specified 

in Liebherr Service Bulletin CFD–F1958–26– 

01, dated May 6, 2022, unless that sensing 

element meets the criteria specified in either 

paragraph (g)(1)(i) or (ii) of this AD. 

(i) The sensing element has been tested as 

specified in Section 3 of the Accomplishment 

Instructions of Kidde Aerospace and Defense 

Service Bulletin CFD–26–1, Revision 6, dated 

February 28, 2022, or earlier revisions, and 

has been found to be serviceable; and the 

sensing element has been marked on one face 

of its connector hex nut and packaged as 

specified in Section 3.C. of the 

Accomplishment Instructions of Kidde 

Aerospace and Defense Service Bulletin 

CFD–26–1, Revision 6, dated February 28, 

2022, or earlier revisions. 

(ii) The sensing element has been tested 

and found to be serviceable as specified in 

paragraph (i) of this AD; and the sensing 

element has been marked on one face of one 

connector hex nut with one green mark, as 

specified in Figure 11 of Bombardier Service 

Bulletin 100–36–10, dated December 23, 

2022, or Bombardier Service Bulletin 350– 

36–003, dated December 23, 2022, as 

applicable (the figure is representative for all 

sensing elements). 

(2) For purposes of this AD, a serviceable 

part is a sensing element that is not an 

affected part. 

(h) Revision of the Existing Airplane Flight 

Manual (AFM) 

For airplane serial numbers 20001 through 

20457 inclusive and 20501 through 20906 

inclusive: Within 30 days after the effective 

date of this AD, revise the existing AFM to 

include the information specified in 

paragraphs (h)(1) and (2) of this AD, as 

applicable. 

(1) For airplane serial numbers 20001 

through 20457 inclusive: Section 05–42, Air 

Conditioning & Pressurization, Non-Normal 

Procedures Section, Bombardier Challenger 

300 AFM (Imperial Version), Publication No. 

CSP 100–1, Revision 71, dated November 9, 

2022. 

Note 1 to paragraph (h)(1): For obtaining 

the procedures for Bombardier Challenger 


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Federal Register / Vol. 88, No. 188 / Friday, September 29, 2023 / Proposed Rules 67121 

300 AFM (Imperial Version), Publication No. 

CSP 100–1, use Document Identification No. 

CH 300 AFM–I. 

(2) For airplane serial numbers 20501 

through 20906 inclusive: Section 05–42, 

Airconditioning & Pressurization, NonNormal Procedures Section, Bombardier 

Challenger 350 AFM, Publication No. CH 350 

AFM, Revision 37, dated November 9, 2022. 

Note 2 to paragraph (h)(2): For obtaining 

the procedures for Bombardier Challenger 

350 AFM, Publication No. CH 350 AFM, use 

Document Identification No. CH 350 AFM. 

(i) Testing of Overheat Detection Sensing 

Elements 

For airplane serial numbers 20001 through 

20457 inclusive and 20501 through 20906 

inclusive: Within 7,500 flight cycles or 96 

months, whichever occurs first, from the 

effective date of this AD, test the overheat 

detection sensing elements to determine if 

they are serviceable, in accordance with the 

Accomplishment Instructions of Bombardier 

Service Bulletin 100–36–10, dated December 

23, 2022, or Bombardier Service Bulletin 

350–36–003, dated December 23, 2022, as 

applicable. 

(1) For each sensing element that is 

serviceable, before further flight, mark the 

sensing element with a witness mark in 

accordance with the Accomplishment 

Instructions of Bombardier Service Bulletin 

100–36–10, dated December 23, 2022; or 

Bombardier Service Bulletin 350–36–003, 

dated December 23, 2022; as applicable. 

(2) For each sensing element that is not 

serviceable, before further flight, replace the 

sensing element with a serviceable part in 

accordance with the Accomplishment 

Instructions of Bombardier Service Bulletin 

100–36–10, dated December 23, 2022; or 

Bombardier Service Bulletin 350–36–003, 

dated December 23, 2022; as applicable. 

(j) Parts Installation Prohibition 

As of the effective date of this AD, no 

person may install an affected part on any 

airplane. 

(k) No Reporting Requirement 

Although Bombardier Service Bulletin 

100–36–10, dated December 23, 2022, and 

Bombardier Service Bulletin 350–36–003, 

dated December 23, 2022; specify to submit 

certain information to the manufacturer, this 

AD does not include that requirement. 

(l) Additional AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): 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 

responsible Flight Standards Office, as 

appropriate. If sending information directly 

to the manager of the International Validation 

Branch, mail it to ATTN: Program Manager, 

Continuing Operational Safety, at the address 

identified in paragraph (m)(2) of this AD or 

email to: 9-avs-nyaco-cos@faa.gov. If mailing 

information, also submit information by 

email. 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 

Bombardier, Inc.’s Transport Canada Design 

Approval Organization (DAO). If approved by 

the DAO, the approval must include the 

DAO-authorized signature. 

(m) Additional Information 

(1) Refer to Transport Canada AD CF– 

2023–09, dated February 14, 2023, for related 

information. This Transport Canada AD may 

be found in the AD docket at regulations.gov 

under Docket No. FAA–2023–1890. 

(2) For more information about this AD, 

contact Steven Dzierzynski, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; telephone 516– 

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

(n) 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 this AD specifies otherwise. 

(i) Bombardier Service Bulletin 100–36–10, 

dated December 23, 2022. 

(ii) Bombardier Service Bulletin 350–36– 

003, dated December 23, 2022. 

(iii) Section 05–42, Air Conditioning & 

Pressurization, Non-Normal Procedures 

Section, Bombardier Challenger 300 AFM 

(Imperial Version), Publication No. CSP 100– 

1, Revision 71, dated November 9, 2022. 

Note 3 to paragraph (n)(2)(iii): For 

obtaining the procedures for Bombardier 

Challenger 300 AFM (Imperial Version), 

Publication No. CSP 100–1, use Document 

Identification No. CH 300 AFM–I. 

(iv) Section 05–42, Air Conditioning & 

Pressurization, Non-Normal Procedures 

Section, Bombardier Challenger 350 AFM, 

Publication No. CH 350 AFM, Revision 37, 

dated November 9, 2022. 

Note 4 to paragraph (n)(2)(iv): For 

obtaining the procedures for Bombardier 

Challenger 350 AFM, Publication No. CH 350 

AFM, use Document Identification No. CH 

350 AFM. 

(v) Liebherr Service Bulletin CFD–F1958– 

26–01, dated May 6, 2022. 

(3) For Bombardier service information 

identified in this AD, contact Bombardier 

Business Aircraft Customer Response Center, 

400 Coˆte-Vertu Road West, Dorval, Que ́bec 

H4S 1Y9, Canada; telephone 514–855–2999; 

email ac.yul@aero.bombardier.com; website 

bombardier.com. 

(4) For Liebherr-Aerospace Toulouse SAS 

service information identified in this AD, 

contact Liebherr-Aerospace Toulouse SAS, 

408, Avenue des Etats-Unis—B.P.52010, 

31016 Toulouse Cedex, France; telephone 

+33 (0)5.61.35.28.28; fax +33 

(0)5.61.35.29.29; email techpub.toulouse@

liebherr.com; website liebherr.aero. 

(5) You may view this service information 

at the FAA, Airworthiness Products Section, 

Operational Safety Branch, 2200 South 216th 

Street, Des Moines, WA. For information on 

the availability of this material at the FAA, 

call 206–231–3195. 

(6) 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 fr.inspection@nara.gov, or go to: 

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

Issued on September 22, 2023. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2023–21102 Filed 9–28–23; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–1892; Project 

Identifier MCAI–2023–00626–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–AE3, Trent 

1000–CE3, Trent 1000–D3, Trent 1000– 

G3, Trent 1000–H3, Trent 1000–J3, 

Trent 1000–K3, Trent 1000–L3, Trent 

1000–M3, Trent 1000–N3, Trent 1000– 

P3, Trent 1000–Q3, and Trent 1000–R3 

engines. This proposed AD was 

prompted by a determination that 

certain intervals for visual inspection of 

the intermediate-pressure stage 8 (IP8) 

and high-pressure stage 3 (HP3) air 

transfer tubes and front bearing housing 

IP8 air feed tubes need to be reduced. 

This proposed AD would require initial 

and repetitive visual inspections of the 

IP8 and HP3 air transfer tubes and front 

bearing housing IP8 air feed tubes for 

cracking, damage, or air leakage wear, 

and replacement, if necessary, 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. 


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