Federal Register / Vol. 88, No. 222 / Monday, November 20, 2023 / Rules and Regulations 80579 

(a) Effective Date 

This airworthiness directive (AD) is 

effective December 26, 2023. 

(b) Affected ADs 

This AD replaces AD 2021–08–02, 

Amendment 39–21496 (86 FR 26651, May 17, 

2021). 

(c) Applicability 

This AD applies to Safran Helicopter 

Engines, S.A. (type certificate previously 

held by Turbomeca, S.A.) Model Arriel 2D 

and Arriel 2E engines. 

(d) Subject 

Joint Aircraft Service Component (JASC) 

Code 7250, Turbine section. 

(e) Unsafe Condition 

This AD was prompted by the 

manufacturer revising the airworthiness 

limitations section (ALS) of the existing 

engine maintenance manual (EMM) to 

introduce new or more restrictive tasks and 

limitations for certain life-limited parts. The 

FAA is issuing this AD to prevent failure of 

life-limited parts. The unsafe condition, if 

not addressed, could result in uncontained 

release of a critical part, damage to the 

engine, and damage to the helicopter. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

(1) Within 90 days after the effective date 

of this AD, revise the ALS of the existing 

EMM or instructions for continued 

airworthiness and the existing approved 

maintenance or inspection program, as 

applicable, by incorporating the actions 

specified in paragraph (1) of European Union 

Aviation Safety Agency (EASA) AD 2022– 

0083, dated May 11, 2022 (EASA AD 2022– 

0083). 

(2) The owner/operator (pilot) holding at 

least a private pilot certificate may perform 

the action required by paragraph (g)(1) of this 

AD for your engine and must enter 

compliance with the applicable paragraphs of 

this AD into the engine maintenance records 

in accordance with 14 CFR 43.9(a) and 

91.417(a)(2)(v). The record must be 

maintained as required by 14 CFR 91.417, 

121.380, or 135.439. 

(h) Provisions for Alternative Actions and 

Intervals 

After the actions required by paragraph (g) 

of this AD have been done, no alternative 

actions and associated thresholds and 

intervals, including life limits, are allowed 

unless they are approved as specified in the 

provisions of the ‘‘Ref Publication’’ section of 

EASA AD 2022–0083. 

(i) 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 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 Kevin Clark, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, Suite 

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

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

(k) 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 2022–0083, dated May 11, 2022. 

(ii) [Reserved] 

(3) For EASA AD 2022–0083, contact 

EASA, Konrad-Adenauer-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. 

(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 26, 2023. 

Caitlin Locke, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2023–25527 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–2023–1404; Project 

Identifier MCAI–2023–00451–T; Amendment 

39–22584; AD 2023–21–12] 

RIN 2120–AA64 

Airworthiness Directives; MHI RJ 

Aviation ULC (Type Certificate 

Previously Held by Bombardier, Inc.) 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for all MHI 

RJ Aviation ULC Model CL–600–2B19 

(Regional Jet Series 100 & 440) 

airplanes. This AD was prompted by a 

report of missing insulation in the 

engine pylon area. This AD requires, for 

certain airplanes, inspecting the engine 

pylon structure for discrepancies and 

repair if necessary. This AD also 

requires revising the existing 

maintenance or inspection program, as 

applicable, to incorporate a new 

certification maintenance requirement 

(CMR) task. 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 certain publications 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–2023–1404; 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 MHI RJ 

Aviation Group, Customer Response 

Center, 3655 Ave. des GrandesTourelles, Suite 110, Boisbriand, 

Que ́bec J7H 0E2 Canada; North America 

toll-free telephone 833–990–7272 or 

direct-dial telephone 450–990–7272; 

email: thd.crj@mhirj.com; website: 

mhirj.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. It is also available at 

regulations.gov under Docket No. FAA– 

2023–1404. 

FOR FURTHER INFORMATION 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. 

SUPPLEMENTARY INFORMATION: 


ddrumheller on DSK120RN23PROD with RULES1
80580 Federal Register / Vol. 88, No. 222 / Monday, November 20, 2023 / Rules and Regulations 

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 MHI RJ Aviation ULC Model 

CL–600–2B19 (Regional Jet Series 100 & 

440) airplanes. The NPRM published in 

the Federal Register on July 12, 2023 

(88 FR 44226). The NPRM was 

prompted by AD CF–2023–19, dated 

March 13, 2023 (Transport Canada AD 

CF–2023–19) (also referred to after this 

as the MCAI), issued by Transport 

Canada, which is the aviation authority 

for Canada. The MCAI states there was 

a report of a missing 12-inch piece of 

insulation in the 14th stage bleed ducts 

installed in both left hand (LH) and 

right hand (RH) engine pylon areas. 

In the NPRM, the FAA proposed to 

require, for certain airplanes, inspecting 

the engine pylon structure for 

discrepancies and repair if necessary. 

The NPRM also proposed to require 

revising the existing maintenance or 

inspection program, as applicable, to 

incorporate a new CMR task. 

The FAA is issuing this AD to address 

missing or damaged insulation in the 

engine pylon area. The unsafe 

condition, if not addressed, could result 

in the bleed duct to radiate heat to the 

surrounding structure and, if not 

corrected, could lead to the loss of the 

structural integrity of the engine pylon 

and possible loss of the engine. 

You may examine the MCAI in the 

AD docket at regulations.gov under 

Docket No. FAA–2023–1404. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received comments from Air 

Line Pilots Association, International 

(ALPA) who supported the NPRM 

without change. 

The FAA received additional 

comments from Air Wisconsin Airlines 

and MHI RJ Aviation ULC (MHI RJ). The 

following presents the comments 

received on the NPRM and the FAA’s 

response to each comment. 

Request To Refer New Temporary 

Revision 

MHI RJ requested that the FAA revise 

the proposed AD to refer to MHI RJ 

Temporary Revision 2A–77, dated May 

8, 2023, which was issued to revise the 

phase-in (initial) compliance time in 

MHI RJ Temporary Revision 2A–76, 

dated September 29, 2022, from 40 

months to 48 months. 

The FAA concurs with the request 

and has revised paragraph (h) of this AD 

to refer to MHI RJ Temporary Revision 

2A–77, dated May 8, 2023, for the new 

CMR task. The FAA has also provided 

credit for using MHI RJ Temporary 

Revision 2A–76, dated September 29, 

2022, in paragraph (j)(2) of this AD. The 

CMR task and interval is the same in 

both temporary revisions. In addition, 

there is no change to initial compliance 

time because paragraph (j) of the 

proposed AD did not refer to MHI RJ 

Temporary Revision 2A–76, dated 

September 29, 2022, for the initial 

compliance time and instead specified 

‘‘The initial compliance time for doing 

the task is within 48 months or 6,600 

flight hours, whichever occurs first after 

the effective date of this AD.’’ The 

compliance time change in MHI RJ 

Temporary Revision 2A–77, dated May 

8, 2023, is within the initial compliance 

time specified in this AD. 

Request To Revise Compliance Time 

MHI RJ stated it noticed that the FAA 

is re-starting the clock in paragraph (h) 

of the proposed AD from the effective 

date of the AD rather than the issue date 

of the temporary revision: MHI RJ states 

that the task interval should start from 

September 29, 2022, which is the issue 

date of MHI RJ Temporary Revision 2A– 

76. MHI RJ stated that, in this particular 

case, the start of the compliance from 

September 29, 2022, is critical for safety. 

The FAA infers that MHI RJ is 

requesting that the agency reduce the 

initial compliance time specified in 

paragraph (h) of this AD by referring to 

the September 29, 2022, date instead of 

the effective date of this AD. 

The FAA acknowledges MHI RJ’s 

concern. However, reducing the 

compliance time in paragraph (h) of this 

AD would result in a more restrictive 

compliance time that would necessitate 

issuing a supplemental NPRM, delaying 

the issuance of the final rule. Since the 

detailed visual inspection of spar 

FS654.50, spar FS672.20, and the 

firewall for discrepancies specified in 

paragraph (g) of this AD would be 

delayed if a supplemental NPRM is 

issued, any increase in the level of 

safety by reducing the compliance time 

in paragraph of (h) of this AD may be 

offset by delaying the inspections in 

paragraph (g) of this AD. The FAA has 

determined to delay this action is not 

appropriate in this case as the 

compliance times in this AD will ensure 

an acceptable level of safety. 

Request To Clarify Compliance Time 

Air Wisconsin Airlines asked if the 

‘‘40 months’’ specified in MHI RJ 

Temporary Revision 2A–76, dated 

September 29, 2022, is in error. Air 

Wisconsin Airlines noted that both 

paragraphs (g) and (h) of the proposed 

AD mention ‘‘within 48 months.’’ 

The FAA agrees to clarify. As stated 

previously, MHI RJ Temporary Revision 

2A–76, dated September 29, 2022, was 

revised by MHI RJ Temporary Revision 

2A–77, dated May 8, 2023, to correct the 

‘‘40 months’’ and change it to ‘‘48 

months.’’ The FAA has not changed this 

AD in this regard. 

Request To Revise Language in 

Paragraph (e) of the Proposed AD 

MHI RJ requested that the proposed 

AD should not only mention missing 

insulation but damaged insulation as 

well and stated the sentence in 

paragraph (e) of the proposed AD 

should read: ‘‘The FAA is issuing this 

AD to address missing or damaged 

insulation in the engine pylon area.’’ 

The FAA concurs and has revised 

paragraph (e) of this AD accordingly. 

The tasks associated with the new CMR 

task specifies inspecting for damaged 

insulation as well as missing insulation. 

Therefore, it is accurate to state that the 

FAA is issuing this AD to address both 

conditions. 

Conclusion 

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 referenced above. The FAA 

reviewed the relevant data, considered 

the comments received, and determined 

that air safety requires adopting this AD 

as proposed. Accordingly, the FAA is 

issuing this AD to address the unsafe 

condition on this product. Except for 

minor editorial changes, and any other 

changes described previously, this AD is 

adopted as proposed in the NPRM. 

None of the changes will increase the 

economic burden on any operator. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed MHI RJ Service 

Bulletin 601R–54–006, Revision A, 

dated May 24, 2023. This service 

information specifies procedures for 

doing a detailed visual inspection of 

spar FS654.50, spar FS672.20, and the 

firewall for discrepancies, including 

corrosion, cracks, web waviness or 

flatness and damaged fasteners. 

The FAA reviewed MHI RJ Temporary 

Revision 2A–77, dated May 8, 2023. 

This service information specifies a new 

CMR task, number C36–12–133–01, 

‘‘Detailed Visual Inspection for missing 

insulation/heat shield on the 14th stage 

bleed duct, running through the pylon 

area between FS654 and FS672.’’ 


ddrumheller on DSK120RN23PROD with RULES1
Federal Register / Vol. 88, No. 222 / Monday, November 20, 2023 / Rules and Regulations 80581 

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. 

Costs of Compliance 

The FAA estimates that this AD 

affects 338 airplanes of U.S. registry. 

The FAA estimates the following costs 

to comply with this AD: 

ESTIMATED COSTS FOR REQUIRED ACTIONS * 

Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

6 work-hours × $85 per hour = $510 .......................................................................................... $0 $510 $172,380 

* This table does not include the cost of revising the existing maintenance or inspection program. 

The FAA has determined that revising 

the existing maintenance or inspection 

program takes an average of 90 workhours per operator, although the agency 

recognizes that this number may vary 

from operator to operator. Since 

operators incorporate maintenance or 

inspection program changes for their 

affected fleet(s), the FAA has 

determined that a per-operator estimate 

is more accurate than a per-airplane 

estimate. Therefore, the agency 

estimates the average total cost per 

operator to be $7,650 (90 work-hours × 

$85 per work-hour). 

The FAA has received no definitive 

data on which to base the cost estimates 

for the on-condition repairs specified in 

this AD. 

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: 

2023–21–12 MHI RJ Aviation ULC (Type 

Certificate Previously Held by 

Bombardier, Inc.): Amendment 39– 

22584; Docket No. FAA–2023–1404; 

Project Identifier MCAI–2023–00451–T. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective December 26, 2023. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to all MHI RJ Aviation 

ULC (Type Certificate previously held by 

Bombardier, Inc.) Model CL–600–2B19 

(Regional Jet Series 100 & 440) airplanes, 

certificated in any category. 

(d) Subject 

Air Transport Association (ATA) of 

America Code: 36, Pneumatic. 

(e) Unsafe Condition 

This AD was prompted by a report of 

missing insulation in the engine pylon area. 

The FAA is issuing this AD to address 

missing or damaged insulation in the engine 

pylon area. The unsafe condition, if not 

addressed, could result in the bleed duct to 

radiate heat to the surrounding structure and, 

if not corrected, could lead to the loss of the 

structural integrity of the engine pylon and 

possible loss of the engine. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Detailed Visual Inspection 

For airplanes having serial numbers 7031, 

7045, 7069, 7078, 7089, 7102, 7110, 7168, 

7188, 7203, 7212, 7217, 7229, 7231, 7236, 

7243, 7257, 7258, 7269, 7271, 7276, 7284, 

7290, 7302, 7304, 7306, 7310, 7328, 7339, 

7342, 7355, 7358, 7360, 7401, 7404, 7437, 

7441, 7448, 7458, 7474, 7476, 7479, 7495, 

7502, 7503, 7517, 7527, 7530, 7532, 7548, 

7551, 7574, 7575, 7579, 7582, 7586, 7588, 

7599, 7600, 7606, 7609, 7623, 7632, 7648, 

7657, 7658, 7664, 7667, 7674, 7681, 7682, 

7683, 7687, 7715, 7727, 7743, 7748, 7749, 

7750, 7758, 7760, 7769, 7780, 7810, 7817, 

7818, 7821, 7822, 7857, 7859, 7871, 7873, 

7889, 7892, 7895, 7909, 7912, 7913, 7920, 

7922, 7923, 7926, 7929, 7932, 7935, 7937, 

7954, 7961, 7964, and 8011: Within 48 

months or 6,600 flight hours, whichever 

occurs first after the effective date of this AD, 

do a detailed visual inspection for 

discrepancies of spar FS654.50, spar 

FS672.20, and the firewall, in accordance 

with Section 2.B. of the Accomplishment 

Instructions of MHI RJ Service Bulletin 

601R–54–006, Revision A, dated May 24, 

2023. If any discrepancies are found, before 

further flight, repair using a method 

approved by the Manager, International 

Validation Branch, FAA; or Transport 

Canada or MHI RJ Aviation ULC’s Transport 

Canada Design Approval Organization 

(DAO). If approved by the DAO, the approval 

must include the DAO-authorized signature. 

(h) Maintenance or Inspection Program 

Revision 

Within 60 days after the effective date of 

this AD, revise the existing maintenance or 


ddrumheller on DSK120RN23PROD with RULES1
80582 Federal Register / Vol. 88, No. 222 / Monday, November 20, 2023 / Rules and Regulations 

inspection program, as applicable, to 

incorporate the information specified in MHI 

RJ Temporary Revision 2A–77, dated May 8, 

2023, for certification maintenance 

requirements task number C36–12–133–01. 

The initial compliance time for doing the 

task is within 48 months or 6,600 flight 

hours, whichever occurs first after the 

effective date of this AD. 

(i) No Alternative Actions or Intervals 

After the existing maintenance or 

inspection program has been revised as 

required by paragraph (h) of this AD, no 

alternative actions (e.g., inspections) or 

intervals may be used unless the actions and 

intervals are approved as an alternative 

method of compliance (AMOC) in 

accordance with the procedures specified in 

paragraph (k)(1) of this AD. 

(j) Credit for Previous Actions 

(1) This paragraph provides credit for 

actions required by paragraph (g) of this AD, 

if those actions were performed before the 

effective date of this AD using MHI RJ 

Service Bulletin 601R–54–006, dated 

September 13, 2022. 

(2) This paragraph provides credit for 

actions required by paragraph (h) of this AD, 

if those actions were performed before the 

effective date of this AD using MHI RJ 

Temporary Revision 2A–76, dated September 

29, 2022. 

(k) 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, International Validation 

Branch, mail it to the address identified in 

paragraph (l)(2) of this AD or email 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 MHI RJ 

Aviation ULC’s Transport Canada DAO. If 

approved by the DAO, the approval must 

include the DAO-authorized signature. 

(l) Additional Information 

(1) Refer to Transport Canada AD CF– 

2023–19, dated March 13, 2023, for related 

information. This Transport Canada AD may 

be found in the AD docket at regulations.gov 

under Docket No. FAA–2023–1404. 

(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. 

(m) 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) MHI RJ Service Bulletin 601R–54–006, 

Revision A, dated May 24, 2023. 

(ii) MHI RJ Temporary Revision 2A–77, 

dated May 8, 2023. 

(3) For service information identified in 

this AD, contact MHI RJ Aviation Group, 

Customer Response Center, 3655 Ave. des 

Grandes-Tourelles, Suite 110, Boisbriand, 

Que ́bec J7H 0E2 Canada; North America tollfree telephone 833–990–7272 or direct-dial 

telephone 450–990–7272; email: thd.crj@

mhirj.com; website: mhirj.com. 

(4) 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. 

(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 20, 2023. 

Ross Landes, 

Deputy Director for Regulatory Operations, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2023–25494 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–2023–1399; Project 

Identifier MCAI–2022–01533–E; Amendment 

39–22585; AD 2023–22–01] 

RIN 2120–AA64 

Airworthiness Directives; Rolls-Royce 

Deutschland Ltd & Co Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is superseding 

Airworthiness Directive (AD) 2020–15– 

07 for certain Rolls-Royce Deutschland 

Ltd & Co KG (RRD) (type certificate 

previously held by Rolls-Royce plc) 

Model RB211–524G2–19, RB211– 

524G2–T–19, RB211–524G3–19, RB211– 

524G3–T–19, RB211–524H2–19, 

RB211–524H2–T–19, RB211–524H–36, 

and RB211–524H–T–36 engines. AD 

2020–15–07 required replacement of the 

low-pressure turbine (LPT) stage 1 disk 

with part number (P/N) UL37606, 

UL37607, UL37608, UL37722, or 

UL37790, installed. This AD was 

prompted by an updated analysis by the 

engine manufacturer, which indicates 

certain part-numbered and serialnumbered LPT stage 1 disks that have 

undergone rework could fail before the 

current published life limits. This AD 

retains the requirement to replace the 

LPT stage 1 disk and includes 

additional LPT stage 1 disks, 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–2023–1399; 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–2023–1399. 

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 to supersede AD 2020–15–07, 


ddrumheller on DSK120RN23PROD with RULES1