76114 Federal Register / Vol. 88, No. 213 / Monday, November 6, 2023 / Rules and Regulations 

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: 

2023–21–04 Embraer S.A.: Amendment 39– 

22576; Docket No. FAA–2023–1708; 

Project Identifier MCAI–2023–00554–A. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective December 11, 2023. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Embraer S.A. Model 

EMB–505 airplanes, as identified in 

paragraph (a) of Ageˆncia Nacional de Aviac ̧a ̃o 

Civil (ANAC) AD 2023–04–01, effective April 

4, 2023 (ANAC AD 2023–04–01), certificated 

in any category. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 3100, Indicating/recording system. 

(e) Unsafe Condition 

This AD was prompted by occurrences of 

an uncommanded change in the setting of the 

barometric pressure in both primary flight 

displays (PFDs). The FAA is issuing this AD 

to address the uncommanded change in the 

setting of the barometric pressure in both 

PFDs. The unsafe condition, if not addressed, 

could result in altitude mismanagement or 

spatial disorientation of the flight crew, with 

consequent deviation from the intended 

altitude and loss of control of the airplane, 

risk of air collision due to inadequate air 

traffic separation, or risk of controlled flight 

into terrain. 

(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: Comply with all required 

actions and compliance times specified in, 

and in accordance with, ANAC AD 2023–04– 

01. 

(h) Exceptions to ANAC AD 2023–04–01 

(1) Where ANAC AD 2023–04–01 refers to 

its effective date, this AD requires using the 

effective date of this AD. 

(2) This AD does not adopt paragraphs (c), 

(d), and (e) of ANAC AD 2023–04–01. 

(i) No Reporting Required 

Although the service information 

referenced in ANAC AD 2023–04–01 

specifies to submit certain information to the 

manufacturer, this AD does not include that 

requirement. 

(j) 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, mail it to the address identified in 

paragraph (k) of this AD or email to: 9-AVSAIR-730-AMOC@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 local Flight Standards District Office/ 

certificate holding district office. 

(k) Additional Information 

For more information about this AD, 

contact Jim Rutherford, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; phone: (816) 329– 

4165; email: jim.rutherford@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) Ageˆncia Nacional de Aviac ̧a ̃o Civil 

(ANAC) AD 2023–04–01, effective April 4, 

2023. 

(ii) [Reserved] 

(3) For ANAC AD 2023–04–01, contact 

ANAC, Continuing Airworthiness Technical 

Branch (GTAC), Rua Doutor Orlando 

Feirabend Filho, 230—Centro Empresarial 

Aquarius—Torre B—Andares 14 a 18, Parque 

Residencial Aquarius, CEP 12.246–190—Sa ̃o 

Jose ́ dos Campos—SP, Brazil; phone: 55 (12) 

3203–6600; email: pac@anac.gov.br; website: 

anac.gov.br/en/. You may find this material 

on the ANAC website at 

sistemas.anac.gov.br/certificacao/DA/ 

DAE.asp. 

(4) You may view this material at the FAA, 

Airworthiness Products Section, Operational 

Safety Branch, 901 Locust, Kansas City, MO 

64106. 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. 2023–24393 Filed 11–3–23; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–1717; Project 

Identifier MCAI–2023–00728–A; Amendment 

39–22578; AD 2023–21–06] 

RIN 2120–AA64 

Airworthiness Directives; Embraer S.A. 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

Embraer S.A. (Embraer) Model EMB– 

505 airplanes. This AD was prompted 

by analysis of certain monuments (the 

right-hand refreshment center and lefthand forward cabinet) that identified 

the need for installing structural 

reinforcements and replacing certain 

floor support rivets. This AD requires 

installing structural reinforcements on 

certain monuments and replacing 

certain floor support rivets, as specified 

in an Ageˆncia Nacional de Aviac ̧a ̃o Civil 

(ANAC) 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 

11, 2023. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of December 11, 2023. 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2023–1717; 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 the service information 

identified in this final rule, contact 

ANAC, Continuing Airworthiness 

Technical Branch (GTAC), Rua Doutor 

Orlando Feirabend Filho, 230—Centro 

Empresarial Aquarius—Torre B 

–Andares 14 a 18, Parque Residencial 

Aquarius, CEP 12.246–190—Sa ̃o Jose ́

dos Campos—SP, Brazil; phone: 55 (12) 

3203–6600; email: pac@anac.gov.br; 


ddrumheller on DSK120RN23PROD with RULES1
Federal Register / Vol. 88, No. 213 / Monday, November 6, 2023 / Rules and Regulations 76115 

website: anac.gov.br/en/. You may find 

this material on the ANAC website at 

sistemas.anac.gov.br/certificacao/DA/ 

DAE.asp. 

• You may view this material at the 

FAA, Airworthiness Products Section, 

Operational Safety Branch, 901 Locust, 

Kansas City, MO 64106. For information 

on the availability of this material at the 

FAA, call (817) 222–5110. It is also 

available in the AD docket at 

regulations.gov under Docket No. FAA– 

2023–1717. 

FOR FURTHER INFORMATION CONTACT: Jim 

Rutherford, Aviation Safety Engineer, 

FAA, 1600 Stewart Avenue, Suite 410, 

Westbury, NY 11590; phone: (816) 329– 

4165; email: jim.rutherford@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 certain serial-numbered 

Embraer Model EMB–505 airplanes. The 

NPRM published in the Federal 

Register on August 24, 2023 (88 FR 

57907). The NPRM was prompted by 

AD 2023–05–03, effective June 2, 2023, 

issued by ANAC, which is the aviation 

authority for Brazil (ANAC AD 2023– 

04–01) (also referred to as the MCAI), to 

correct an unsafe condition for certain 

serial-numbered Embraer Model EMB– 

505 airplanes. The MCAI states that 

analysis identified certain monuments 

(the right-hand refreshment center and 

left-hand forward cabinet) that might 

not withstand the loads expected for 

specific emergency landing conditions, 

which may cause the detachment of 

mass items and result in injuries to the 

airplane occupants. To address this 

unsafe condition, the MCAI specifies 

installing structural reinforcements on 

certain monuments and replacing 

applicable floor support rivets. 

In the NPRM, the FAA proposed to 

require installing structural 

reinforcements on certain monuments 

and replacing certain floor support 

rivets, as specified in ANAC AD 2023– 

04–01. The FAA is issuing this AD to 

address the unsafe condition. 

You may examine the MCAI in the 

AD docket at regulations.gov under 

Docket No. FAA–2023–1717. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received no comments on 

the NPRM or on the determination of 

the costs. 

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 and determined that air safety 

requires adopting this AD as proposed. 

Accordingly, the FAA is issuing this AD 

to address the unsafe condition on these 

products. This AD is adopted as 

proposed in the NPRM. 

Related Service Information Under 1 

CFR Part 51 

ANAC AD 2023–05–03 specifies 

procedures for installing structural 

reinforcements on certain monuments 

and replacing applicable fasteners on 

the floor support. 

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. 

Differences Between This AD and the 

MCAI 

The service information specified in 

ANAC AD 2023–05–03 allows the use of 

alternative or similar parts in place of 

the ones specified in the kits, provided 

these alternative or similar parts are 

approved by Embraer, but this AD 

requires approval from either the 

Manager, International Validation 

Branch, FAA; ANAC; or ANAC’s 

authorized Designee. 

Costs of Compliance 

The FAA estimates that this AD 

affects 208 airplanes of U.S. registry. 

The FAA estimates the following 

costs to comply with this AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product Cost on U.S. operators 

Airplane groups 1 and 2—install structural reinforcements.21.50 work-hours × $85 per hour = 

$1,827.50.

$1,600 $3,427.50 $239,925 (70 airplanes). 

Airplane groups 3, 4, 5, and 10—install 

structural reinforcements and replace 

floor fasteners.

13.50 work-hours × $85 per hour = 

$1,147.50.

$600 $1,747.50 $214,942.50 (123 airplanes). 

Airplane groups 6 and 8—install structural reinforcements and replace floor 

fasteners.

25.50 work-hours × $85 per hour = 

$2,167.50.

$2,000 $4,167.50 $37,507.50 (9 airplanes). 

Airplane group 7—install structural reinforcements.19.50 work-hours × $85 per hour = 

$1,657.50.

$1,600 $3,257.50 $16,287.50 (5 airplanes). 

Airplane group 9—install structural reinforcements.13.50 work-hours × $85 per hour = 

$1,147.50.

$1,600 $2,747.50 $2,747.50 (1 airplane). 

The FAA estimates the following 

costs for operators that did the actions 

in the original version of Embraer 

Service Bulletin SB505–25–0046, dated 

March 31, 2021. The agency has no way 

of determining the number of airplanes 

that might need these actions: 

ON-CONDITION COSTS

Action Labor cost Parts cost Cost per product 

Inspect floor fasteners ............................................ 8.50 work-hours × $85 per hour = $722.50 ........... $50 $772.50 

Replace floor fasteners ........................................... 1 work-hour × $85 per hour = $85 ......................... $50 $135 


ddrumheller on DSK120RN23PROD with RULES1
76116 Federal Register / Vol. 88, No. 213 / Monday, November 6, 2023 / Rules and Regulations 

The FAA has included all known 

costs in its cost estimate. According to 

the manufacturer, however, all of the 

costs of this 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 

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: 

2023–21–06 Embraer S.A.: Amendment 39– 

22578; Docket No. FAA–2023–1717; 

Project Identifier MCAI–2023–00728–A. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective December 11, 2023. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Embraer S.A. Model 

EMB–505 airplanes, as identified in Ageˆncia 

Nacional de Aviac ̧a ̃o Civil (ANAC) AD 2023– 

05–03, effective June 2, 2023 (ANAC AD 

2023–05–03), certificated in any category. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 2500, Cabin Equipment/Furnishings. 

(e) Unsafe Condition 

This AD was prompted by analysis of 

certain monuments (the right-hand 

refreshment center and left-hand forward 

cabinet) that identified the need for installing 

structural reinforcements and replacing 

applicable floor support rivets. The FAA is 

issuing this AD to address the unsafe 

condition. The unsafe condition, if not 

addressed, could result in a monument not 

withstanding the loads expected for specific 

emergency landing conditions, which may 

cause the detachment of mass items and 

result in injuries to the airplane occupants. 

(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: Comply with all required 

actions and compliance times specified in, 

and in accordance with, ANAC AD 2023–05– 

03. 

(h) Exceptions to ANAC AD 2023–05–03 

(1) Where ANAC AD 2023–05–03 refers to 

its effective date, this AD requires using the 

effective date of this AD. 

(2) The service information referenced in 

ANAC AD 2023–05–03 allows the use of 

alternative or similar parts in place of the 

ones specified in the kits, provided that these 

alternative or similar parts are approved by 

Embraer. This AD requires approval from 

either the Manager, International Validation 

Branch, FAA; ANAC; or ANAC’s authorized 

Designee. If approved by the ANAC Designee, 

the approval must include the Designee’s 

authorized signature. 

(3) Where the service information 

referenced in ANAC AD 2023–05–03 

specifies discarding parts, this AD requires 

removing those parts from service. 

(4) This AD does not adopt paragraph (d) 

of ANAC AD 2023–05–03. 

(i) No Reporting Requirement 

Although the service information 

referenced in ANAC AD 2023–05–03 

specifies to submit certain information to the 

manufacturer, this AD does not include that 

requirement. 

(j) 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, mail it to the address identified in 

paragraph (k) of this AD or email to: 9-AVSAIR-730-AMOC@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 local Flight Standards District Office/ 

certificate holding district office. 

(k) Additional Information 

For more information about this AD, 

contact Jim Rutherford, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; phone: (816) 329– 

4165; email: jim.rutherford@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) Ageˆncia Nacional de Aviac ̧a ̃o Civil 

(ANAC) AD 2023–05–03, effective June 2, 

2023. 

(ii) [Reserved] 

(3) For ANAC AD 2023–05–03, contact 

ANAC, Continuing Airworthiness Technical 

Branch (GTAC), Rua Doutor Orlando 

Feirabend Filho, 230—Centro Empresarial 

Aquarius—Torre B—Andares 14 a 18, Parque 

Residencial Aquarius, CEP 12.246–190—Sa ̃o 

Jose ́ dos Campos—SP, Brazil; phone: 55 (12) 

3203–6600; email: pac@anac.gov.br; website: 

anac.gov.br/en/. You may find this material 

on the ANAC website at 

sistemas.anac.gov.br/certificacao/DA/ 

DAE.asp. 

(4) You may view this service information 

at the FAA, Airworthiness Products Section, 

Operational Safety Branch, 901 Locust, 

Kansas City, MO 64106. 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. 


ddrumheller on DSK120RN23PROD with RULES1
Federal Register / Vol. 88, No. 213 / Monday, November 6, 2023 / Rules and Regulations 76117 

Issued on October 26, 2023. 

Caitlin Locke, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2023–24387 Filed 11–3–23; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2022–1314; Project 

Identifier AD–2021–00811–E; Amendment 

39–22579; AD 2023–21–07] 

RIN 2120–AA64 

Airworthiness Directives; General 

Electric Company Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is superseding 

Airworthiness Directive (AD) 2018–03– 

13 for certain General Electric Company 

(GE) Model CT7–5A2, CT7–5A3, CT7– 

7A, CT7–7A1, CT7–9B, CT7–9B1, CT7– 

9B2, CT7–9C, and CT7–9C3 engines. AD 

2018–03–13 required initial and 

repetitive visual inspections and 

fluorescent penetrant inspections (FPIs) 

of the main propeller shaft. This AD was 

prompted by an in-flight failure of a 

main propeller shaft on a GE Model 

CT7–9B engine, resulting in the loss of 

the propeller. This AD requires initial 

and repetitive visual inspections, FPIs, 

and ultrasonic inspections (USIs) of the 

main propeller shaft. Depending on the 

results of these inspections, this AD 

requires replacement of the main 

propeller shaft. As an optional 

terminating action to these inspections, 

this AD requires revising the 

airworthiness limitations section (ALS) 

of the existing maintenance manual 

(MM) and the operator’s existing 

approved maintenance program or 

inspection program, as applicable, to 

incorporate incorporating the tasks and 

reduced inspection thresholds for the 

main propeller shaft. The FAA is 

issuing this AD to address the unsafe 

condition on these products. 

DATES: This AD is effective December 

11, 2023. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of December 11, 2023. 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2022–1314; 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, 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 GE service information 

identified in this final rule, contact 

General Electric Company, 1 Neumann 

Way, Cincinnati, OH 45215; phone: 

(513) 552–3272; email: 

aviation.fleetsupport@ae.ge.com; 

website: ge.com. 

• 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–2022–1314. 

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 supplemental 

notice of proposed rulemaking (SNPRM) 

to amend 14 CFR part 39 to supersede 

AD 2018–03–13, Amendment 39–19186 

(83 FR 6125, February 13, 2018) (AD 

2018–03–13). AD 2018–03–13 applied 

to certain GE Model CT7–5A2, CT7– 

5A3, CT7–7A, CT7–7A1, CT7–9B, CT7– 

9B1, CT7–9B2, CT7–9C and CT7–9C3 

engines. The SNPRM published in the 

Federal Register on July 11, 2023 (88 FR 

44068). The SNPRM was prompted by a 

comment from GE Aerospace on the 

notice of proposed rulemaking (NPRM). 

GE Aerospace stated that certain engine 

models were included in incorrect 

Figures within the Required Actions 

paragraph of the NPRM, which would 

attribute inaccurate inspection 

thresholds to those engine models. 

Therefore, the FAA issued the SNPRM 

with a revision to Figures 1 and 2 to 

include the correct engine models. The 

FAA also updated the affected engine 

models listed in paragraphs (g)(1) and 

(g)(2) of the SNPRM to correspond with 

the corrected engine models referenced 

in Figures 1 and 2. 

In the SNPRM, the FAA proposed to 

require initial and repetitive visual 

inspections, FPIs, and USIs of the main 

propeller shaft. Depending on the 

results of these inspections, the SNPRM 

proposed to require replacing the main 

propeller shaft. As an optional 

terminating action to these inspections, 

the SNPRM proposed to require revising 

the ALS of the existing MM and the 

operator’s existing approved 

maintenance program or inspection 

program, as applicable, to incorporate 

the tasks and reduced inspection 

thresholds for the main propeller shaft. 

The FAA is issuing this AD to address 

the unsafe condition on these products. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received comments from 

one commenter, GE Aerospace. The 

following presents the comment 

received on the SNPRM and the FAA’s 

response to that comment. 

Request To Remove Typographical 

Error From SNPRM 

GE noted that there is a typological 

[typographical] error in the ‘‘Proposed 

AD Requirements in This SNPRM’’ 

paragraph of the SNPRM in which the 

words ‘‘at least’’ are repeated in 

succession. 

The FAA agrees, however, the 

‘‘Proposed AD Requirements in This 

SNPRM’’ paragraph is not included in 

this Final Rule. The FAA did not change 

this AD as a result of this comment. 

Conclusion 

The FAA reviewed the relevant data, 

considered any comments 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 and any other changes 

described previously, this AD is 

adopted as proposed in the SNPRM. 

None of the changes will increase the 

economic burden on any operator. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed GE Service 

Bulletin (SB) CT7–TP 72–0541 R01, 

dated November 18, 2021 (GE SB CT7– 

TP 72–0541). This service information 

specifies procedures for performing 

initial and repetitive visual inspections, 

FPIs, and USIs of the main propeller 

shaft. 

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. 


ddrumheller on DSK120RN23PROD with RULES1