89632 Federal Register / Vol. 88, No. 248 / Thursday, December 28, 2023 / Proposed Rules 

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 (l)(1) of this AD. 

(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. 

(l) Additional Information 

(1) For more information about this AD, 

contact Carol Nguyen, Aviation Safety 

Engineer, FAA, 2200 South 216th Street, Des 

Moines, WA 98198; phone: (781) 238–7655; 

email: carol.nguyen@faa.gov. 

(2) Service information identified in this 

AD that is not incorporated by reference is 

available at the addresses specified in 

paragraphs (m)(6) and (7) of this AD. 

(m) 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. 

(3) The following service information was 

approved for IBR on [DATE 35 DAYS AFTER 

PUBLICATION OF THE FINAL RULE]. 

(i) Pratt & Whitney (PW) Alert Service 

Bulletin PW1000G–C–72–00–0224–00A– 

930A–D, Issue No: 001, dated November 3, 

2023. 

(ii) PW Alert Service Bulletin PW1000G– 

C–72–00–0225–00A–930A–D, Issue No: 001, 

dated November 3, 2023. 

(iii) PW Special Instruction NO. 198F–23, 

dated November 3, 2023. 

(4) The following service information was 

approved for IBR on August 28, 2023 (88 FR 

56999, August 22, 2023). 

(i) PW Special Instruction NO. 149F–23, 

dated August 4, 2023. 

(ii) [Reserved] 

(5) The following service information was 

approved for IBR on November 7, 2022 (87 

FR 59660, October 3, 2022; corrected October 

24, 2022 (87 FR 64156)). 

(i) PW Service Bulletin PW1000G–C–72– 

00–0188–00A–930A–D, Issue No: 002, dated 

July 8, 2022. 

(ii) [Reserved] 

(6) For PW service information identified 

in this AD, contact International Aero 

Engines, LLC, 400 Main Street, East Hartford, 

CT 06118; phone: (860) 565–0140; email: 

help24@pw.utc.com; website: 

connect.prattwhitney.com. 

(7) 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. 

(8) 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 December 21, 2023. 

Caitlin Locke, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2023–28693 Filed 12–22–23; 4:15 pm] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–2237; Project 

Identifier AD–2023–01057–E] 

RIN 2120–AA64 

Airworthiness Directives; International 

Aero Engines, LLC Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Proposed rule; withdrawal. 

SUMMARY: The FAA is withdrawing a 

notice of proposed rulemaking (NPRM) 

that proposed to supersede 

Airworthiness Directive (AD) 2022–19– 

15, which applies to certain 

International Aero Engines, LLC (IAE 

LLC) Model PW1100G series engines; 

and AD 2023–16–07, which applies to 

certain IAE LLC Model PW1100G series 

engines and PW1400G series engines. 

AD 2022–19–15 requires an angled 

ultrasonic inspection (AUSI) of the 

high-pressure turbine (HPT) 1st-stage 

disk and HPT 2nd-stage disk, and 

replacement if necessary. AD 2023–16– 

07 requires an AUSI of the HPT 1ststage hub (also known as the HPT 1ststage disk) and HPT 2nd-stage hub (also 

known as the HPT 2nd-stage disk) for 

cracks, and replacement if necessary, 

which is terminating action for AD 

2022–19–15. The NPRM was prompted 

by a manufacturer investigation that 

determined an increased risk of powder 

metal anomalies for all powder metal 

parts in certain powder metal 

production campaigns, which are 

susceptible to failure significantly 

earlier than previously determined. The 

NPRM would have retained the AUSI 

requirement for certain HPT 1st-stage 

and HPT 2nd-stage hubs from AD 2023– 

16–07. The NPRM would also have 

required performing an AUSI of the HPT 

1st-stage hub, HPT 2nd-stage hub, highpressure compressor (HPC) 7th-stage 

integrally bladed rotor (IBR–7), and HPC 

8th-stage integrally bladed rotor (IBR–8) 

for cracks and replacement if necessary. 

The NPRM would also have required 

accelerated replacement of the HPC 

IBR–7, HPC IBR–8, HPC rear hub, HPT 

1st-stage hub, HPT 1st-stage air seal, 

HPT 1st-stage blade retaining plate, HPT 

2nd-stage hub, HPT 2nd-stage blade 

retaining plate, and HPT 2nd-stage rear 

seal. Since issuance of the NPRM, the 

FAA has received information that an 

error was inadvertently included in the 

compliance times for some of the HPT 

1st-stage and 2nd-stage hubs, which 

would have required removal 

significantly later than necessary. 

Accordingly, the NPRM is withdrawn. 

DATES: As of December 28, 2023, the 

proposed rule, which was published in 

the Federal Register on December 12, 

2023 (88 FR 86088), is withdrawn. 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov by searching 

for and locating Docket No. FAA–2023– 

2237; 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 AD action, 

the NPRM, any comments received, and 

other information. The street address for 

Docket Operations is Docket Operations, 

M–30, West Building Ground Floor, 

Room W12–140, 1200 New Jersey 

Avenue SE, Washington, DC 20590. 

FOR FURTHER INFORMATION CONTACT: 

Carol Nguyen, Aviation Safety Engineer, 

FAA, 2200 South 216th Street, Des 

Moines, WA 98198; phone: (781) 238– 

7655; email: carol.nguyen@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued an NPRM that 

proposed to amend 14 CFR part 39 by 

adding an AD that would apply to 

certain IAE LLC Model PW1122G–JM, 

PW1124G1–JM, PW1124G–JM, 

PW1127G–JM, PW1127G1–JM, 

PW1127GA–JM, PW1129G–JM, 

PW1130G–JM, PW1133G–JM, 

PW1133GA–JM, PW1428G–JM, 

PW1428GA–JM, PW1428GH–JM, 

PW1431G–JM, PW1431GA–JM, and 

PW1431GH–JM engines. The NPRM was 

published in the Federal Register on 

December 12, 2023 (88 FR 86088). The 

NPRM was prompted by an analysis of 

an event involving an IAE LLC Model 

PW1127GA–JM engine, which 

experienced failure of a HPC IBR–7 that 

resulted in an engine shutdown and 

aborted takeoff; and the FAA’s 

determination to supersede AD 2022– 

19–15, Amendment 39–22184 (87 FR 

59660, October 3, 2022; corrected 

October 24, 2022 (87 FR 64156)) (AD 

2022–19–15), and AD 2023–16–07, 

Amendment 39–22526 (88 FR 56999, 

August 22, 2023) (AD 2023–16–07). The 

NPRM proposed to retain the AUSI 

requirement for certain HPT 1st-stage 

and HPT 2nd-stage hubs from AD 2023– 

16–07. The NPRM also proposed to 

require performing an AUSI of the HPT 


khammond on DSKJM1Z7X2PROD with PROPOSALS
Federal Register / Vol. 88, No. 248 / Thursday, December 28, 2023 / Proposed Rules 89633 

1st-stage hub, HPT 2nd-stage hub, HPC 

IBR–7, and HPC IBR–8 for cracks and 

replacement if necessary. The NPRM 

also proposed to require accelerated 

replacement of the HPC IBR–7, HPC 

IBR–8, HPC rear hub, HPT 1st-stage hub, 

HPT 1st-stage air seal, HPT 1st-stage 

blade retaining plate, HPT 2nd-stage 

hub, HPT 2nd-stage blade retaining 

plate, and HPT 2nd-stage rear seal. 

The proposed actions were intended 

to address failure of the HPT 1st-stage 

hub, HPT 2nd-stage hub, HPC IBR–7, 

and HPC IBR–8, which could result in 

uncontained hub failure, release of highenergy debris, damage to the engine, 

damage to the airplane, and loss of the 

airplane. 

Actions Since the NPRM Was Issued 

Since issuance of the NPRM, the FAA 

has received information from Pratt & 

Whitney that an error was inadvertently 

included in the removal times for some 

of the HPT 1st-stage and 2nd-stage hubs, 

which would have required removal 

significantly later than necessary. 

Because the removal timeframe needed 

to be shortened, the FAA determined it 

is necessary to withdraw the NPRM and 

issue a new NPRM for the unsafe 

condition with the correct compliance 

times. 

Withdrawal of the NPRM constitutes 

only such action and does not preclude 

the FAA from further rulemaking on 

this issue, nor does it commit the FAA 

to any course of action in the future. 

Comments 

The FAA received comments on the 

NPRM. However, due to the FAA’s 

determination that it is necessary to 

withdraw and issue a new NPRM, the 

comments will be copied to Docket No. 

FAA–2023–2401 and addressed in the 

final rule for that AD action. 

Additionally, the FAA requests that the 

commenters review the new NPRM at 

Docket No. FAA–2023–2401. 

FAA’s Conclusions 

Upon further consideration, the FAA 

has determined that the NPRM does not 

adequately address the identified unsafe 

condition. Accordingly, the NPRM is 

withdrawn. 

Regulatory Findings 

Since this action only withdraws an 

NPRM, it is neither a proposed nor a 

final rule. This action therefore is not 

covered under Executive Order 12866, 

the Regulatory Flexibility Act, or DOT 

Regulatory Policies and Procedures (44 

FR 11034, February 26, 1979). 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

The Withdrawal 

■ Accordingly, the notice of proposed 

rulemaking (Docket No. FAA–2023– 

2237), which was published in the 

Federal Register on December 12, 2023 

(88 FR 86088), is withdrawn. 

Issued on December 21, 2023. 

Caitlin Locke, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2023–28703 Filed 12–22–23; 4:15 pm] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–2402; Project 

Identifier MCAI–2023–00370–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 

certain Bombardier, Inc., Model CL– 

600–2B16 (601–3A, 601–3R, and 604 

Variants) airplanes. This proposed AD 

was prompted by a report indicating 

that a new filter plate connector for the 

nose wheel steering (NWS) system 

electronic control module (ECM) does 

not meet certain certification 

requirements. This proposed AD would 

require replacing all affected noncompliant ECMs. This proposed AD 

would also prohibit the installation of 

affected parts under certain conditions. 

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 February 12, 

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–2023–2402; 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 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. 

• 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. 

FOR FURTHER INFORMATION CONTACT: 

Steven Dzierzynski, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 11590; phone: 

(516) 228–7300; email: 9-avs-nyacocos@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–2023–2402; Project Identifier 

MCAI–2023–00370–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 


khammond on DSKJM1Z7X2PROD with PROPOSALS