[Federal Register Volume 88, Number 131 (Tuesday, July 11, 2023)]
[Proposed Rules]
[Pages 44068-44075]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2023-14471]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2022-1314; Project Identifier AD-2021-00811-E]
RIN 2120-AA64


Airworthiness Directives; General Electric Company Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Supplemental notice of proposed rulemaking (SNPRM).

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SUMMARY: The FAA is revising a notice of proposed rulemaking (NPRM) 
that applied to 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. 
The NPRM proposed to supersede Airworthiness Directive (AD) 2018-03-13. 
This action revises the NPRM by regrouping certain engine models within 
the figures in the Required Actions paragraph. The FAA is proposing 
this airworthiness directive to address the unsafe condition on these 
products. Since these actions expand the applicability for the required 
actions as proposed in the NPRM, the agency is requesting comments on 
this SNPRM.

DATES: The FAA must receive comments on this SNPRM by August 25, 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 by 
searching for and locating 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 the NPRM, this SNPRM, 
any comments received, and other information. The street address for 
Docket Operations is listed above.
    Material Incorporated by Reference:
     For GE service information identified in this SNPRM, 
contact General Electric Company, 1 Neumann Way, Cincinnati, OH 45215; 
phone: (513) 552-3272; email: ge.com">[email protected]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.

FOR FURTHER INFORMATION CONTACT: Sungmo Cho, Aviation Safety Engineer, 
FAA, 2200 South 216th Street, Des Moines, WA 98198; phone: (781) 238-
7241; email: [email protected].

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 the ADDRESSES section. Include ``Docket No. FAA-2022-1314; 
Project Identifier AD-2021-00811-E'' at the beginning of your comments.
    The most helpful comments reference a specific portion of the 
proposal, explain the reason for any recommended change, and include 
supporting data. The FAA will consider all comments received by the 
closing date and may again revise this proposal because of those 
comments.
    Except for Confidential Business Information (CBI) as described in 
the

[[Page 44069]]

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 proposed AD.

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 SNPRM 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 SNPRM, 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 SNPRM. Submissions containing CBI should 
be sent to Sungmo Cho, Aviation Safety Engineer, FAA, 2200 South 216th 
Street, Des Moines, WA 98198. Any commentary that the FAA receives 
which is not specifically designated as CBI will be placed in the 
public docket for this rulemaking.

Background

    The FAA issued an NPRM to amend 14 CFR part 39 by adding an AD that 
would apply to GE Model CT7-5A2, CT7-5A3, CT7-7A, CT7-7A1, CT7-9B, CT7-
9B1, CT7-9B2, CT7-9C, and CT7-9C3 engines. The NPRM published in the 
Federal Register on November 1, 2022 (87 FR 65694) and proposed to 
supersede AD 2018-03-13, Amendment 39-19186 (83 FR 6125, February 13, 
2018) (AD 2018-03-13), for certain GE Model CT7-5A2, CT7-5A3, CT7-7A, 
CT7-7A1, CT7-9B, CT7-9B1, CT7-9B2, CT7-9C, and CT7-9C3 engines with 
main propeller shaft, part number 77581-11, installed. AD 2018-03-13 
published with part number 77581-11, which was a typographical error. 
The correct part number is 775801-11, however, reference to that part 
number is no longer necessary for this SNPRM and is not included in the 
applicability. AD 2018-03-13 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. A manufacturer investigation determined the failure 
of the main propeller shaft was caused by cracks initiating from 
undiscovered corrosion in the dowel pin holes on the flange of the main 
propeller shaft. After the FAA issued AD 2018-03-13, the manufacturer 
detected two additional cracks on a main propeller shaft during its 
ongoing investigation and subsequently published service information 
that introduced reduced inspection thresholds for initial and 
repetitive visual inspections, fluorescent penetrant inspections 
(FPIs), and added initial and repetitive ultrasonic inspections (USIs) 
of the main propeller shaft. Additionally, the manufacturer revised the 
airworthiness limitations section (ALS) of the maintenance manual (MM) 
to incorporate initial and repetitive USIs to inspect for cracks on the 
main propeller shaft. As a result, the FAA proposed to supersede AD 
2018-03-13 by issuing the NPRM. In the NPRM, 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 NPRM proposed to require replacement of the main 
propeller shaft. As an optional terminating action to these 
inspections, the NPRM 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.

Actions Since the NPRM Was Issued

    Since the FAA issued the NPRM, GE Aerospace commented on the NPRM, 
stating 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 has revised Figures 1 and 2 in this SNPRM to include 
the correct engine models. The FAA has also updated the affected engine 
models listed in paragraphs (g)(1) and (g)(2) of this SNPRM to 
correspond with the corrected engine models referenced in Figures 1 and 
2.

Comments

    The FAA received comments from GE Aerospace and two anonymous 
commenters. GE Aerospace requested changes to the NPRM. The two 
anonymous commenters supported the NPRM without change. The following 
presents the comments received on the NPRM and the FAA's response to 
each comment.

Request To Regroup Engines in Figure 1 to Paragraph (g)(1)

    GE Aerospace requested that the FAA revise Figure 1 to Paragraph 
(g)(1) of the NPRM to align with GE Service Bulletin (SB) CT7-TP 72-
0541 R01, dated November 18, 2021 (GE SB CT7-TP 72-0541). GE noted that 
Figure 1 to Paragraph (g)(1) incorrectly grouped together CT7-5 engine 
models with CT7-7 engine models. GE also noted that CT7-5 engine models 
should be grouped with CT7-9B engine models, as specified GE SB CT7-TP 
72-0541, which groups engine models according to aircraft type.
    The FAA agrees and has revised paragraph (g)(1) and Figure 1 to 
Paragraph (g)(1) of this SNPRM by removing CT7-7A and CT7-7A1 model 
engines and adding CT7-9B, CT7-9B1, and CT7-9B2 model engines.

Request To Regroup Engines in Figure 2 to Paragraph (g)(2)

    GE Aerospace requested that the FAA revise Figure 2 to Paragraph 
(g)(2) of the NPRM to align with GE SB CT7-TP 72-0541. GE noted that 
Figure 2 to Paragraph (g)(2) incorrectly grouped together CT7-9B engine 
models with CT7-9C engine models. GE also noted that CT7-7 engine 
models should be grouped with CT7-9C engine models, as specified in GE 
SB CT7-TP 72-0541, which groups engine models according to aircraft 
type.
    The FAA agrees and has revised paragraph (g)(2) and Figure 2 to 
Paragraph (g)(2) of this SNPRM by removing CT7-9B, CT7-9B1, and CT7-9B2 
model engines and adding CT7-7A and CT7-7A1 model engines.

Request To Clarify GE Service Bulletin (SB) Citation

    GE Aerospace noted that the SB revision number for GE SB CT7-TP 72-
0541 R01, dated November 18, 2021, is listed in paragraph (g)(3)(i) of 
the NPRM, but is not included in the SB citation in paragraph 
(g)(3)(ii) and (iii) of the NPRM. GE requested that the FAA revise the 
SB citation in paragraphs (g)(3)(i), (ii), and (iii) to: ``GE SB CT7-TP 
72-0541 latest revision'' because guiding operators to latest version 
of SB revisions could be efficient, accessible, or beneficial.
    The FAA acknowledges that the revision number for GE SB CT7-TP 72-
0541 R01, dated November 18, 2021, is not listed in paragraph 
(g)(1)(ii) and (iii) of the NPRM. However, the FAA notes that the 
shorthand for this SB is in paragraph (g)(1)(i) as ``GE SB CT7-TP 72-
0541.'' The FAA notes that this shorthand indicates the text in

[[Page 44070]]

parenthesis to be equivalent to the full citation of the SB for the 
subsequent paragraphs. The FAA disagrees with adding ``latest 
revision'' when referencing the service information in paragraph (g) of 
this SNPRM. Future revisions of the service information have not yet 
been published by the manufacturer or reviewed by the FAA. A request 
for an alternative method of compliance can be submitted to the FAA if 
future revisions of the service information referenced in paragraph (g) 
of this SNPRM are published. Additionally, if future revisions of the 
service information are published by the manufacturer and approved by 
the FAA, the FAA may consider further rulemaking. The FAA did not 
change this proposed AD as a result of this comment.

Request To Remove Figure 3 to Paragraph (h)(1)

    GE Aerospace commented that the visual inspection detailed in 
Figure 3 to Paragraph (h)(1) of the NPRM was not included in the ALS of 
the MM when the NPRM was published, but has since been added to the 
ALS. GE stated that Figure 3 to Paragraph (h)(1) of this AD may be 
eliminated, and language in paragraph (h)(1) revised to: ``(1) For 
affected CT7-5A2, CT7-5A3, CT7-7A, and CT7-7A1 model engines, revise 
the airworthiness limitations section (ALS) of the existing maintenance 
manual (MM) and the operator's existing approved maintenance program or 
inspection program, as applicable, by incorporating the manufacturer's 
latest ALS of the existing MM.''
    The FAA disagrees with removing Figure 3 to paragraph (h)(1) of 
this SNPRM AD because it clarifies the specific tasks operators must 
complete in order to comply with the SNPRM. The FAA also disagrees with 
changing the language in paragraph (h)(1) to require incorporating the 
manufacturer's latest ALS of the existing MM. The FAA notes that 
although the ALS has been revised to include the visual inspection task 
from Figure 3 to paragraph (h)(1) of this SNPRM, the ALS also presents 
instructions that are not necessary for operators to complete in order 
to comply with this proposed AD. The FAA did not change this proposed 
AD as a result of this comment.

Request To Remove Figure 4 to Paragraph (h)(2)

    GE Aerospace commented that the visual inspection detailed in 
Figure 4 to Paragraph (h)(2) of the NPRM AD was not included in the ALS 
when the NPRM was published, and has since been added to the ALS. GE 
stated that Figure 4 to Paragraph (h)(2) of this NPRM may be 
eliminated, and language in paragraph (h)(2) revised to: ``(1) For 
affected CT7-5A2, CT7-5A3, CT7-7A, and CT7-7A1 model engines, revise 
the `airworthiness limitations section (ALS) of the existing 
maintenance manual (MM) and the operator's existing approved 
maintenance program or inspection program, as applicable, by 
incorporating the manufacturer's latest ALS of the existing MM.''
    The FAA disagrees with removing Figure 4 to paragraph (h)(2) of 
this SNPRM because it clarifies the specific tasks operators must 
complete in order to comply with the proposed AD. The FAA also 
disagrees with changing the language in paragraph (h)(2) to require 
incorporating the manufacturer's latest ALS of the existing MM. The FAA 
notes that although the ALS has been updated to include the visual 
inspection task from Figure 4 to paragraph (h)(2) of this AD, the ALS 
also presents superfluous instructions that are not necessary for 
operators to complete in order to comply with this proposed AD. The FAA 
did not change this proposed AD as a result of this comment.

FAA's Determination

    The FAA is proposing this AD after determining the unsafe condition 
described previously is likely to exist or develop in other products of 
the same type design. Certain changes described above expand the scope 
of the NPRM. As a result, it is necessary to reopen the comment period 
to provide additional opportunity for the public to comment on this 
SNPRM.

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 ADDRESSES.

Proposed AD Requirements in This SNPRM

    This proposed AD would require initial and repetitive visual 
inspections, FPIs, and USIs of the main propeller shaft. Depending on 
the results of these inspections, this proposed AD would require 
replacement of the main propeller shaft. As an optional terminating 
action to these inspections, this proposed AD would 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. An owner/operator (pilot) holding at least at least a 
private pilot certificate may revise the ALS of the existing MM, and 
the owner/operator must enter compliance with the applicable paragraphs 
of the AD into the aircraft 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. This is an exception to the FAA's 
standard maintenance regulations.

Differences Between This SNPRM and the Service Information

    GE SB CT7-TP 72-0541 uses the term ``ultrasonic inspection (UTI),'' 
while this proposed AD uses the term ``ultrasonic inspection (USI).''

Costs of Compliance

    The FAA estimates that this AD, if adopted as proposed, would 
affect 176 engines installed on airplanes of U.S. registry.
    The FAA estimates the following costs to comply with this proposed 
AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                    Cost per       Cost on U.S.
               Action                        Labor cost           Parts cost        product         operators
----------------------------------------------------------------------------------------------------------------
Visually inspect, FPI, and USI the    2 work-hours x $85 per               $0             $170          $29,920
 main propeller shaft.                 hour = $170.
----------------------------------------------------------------------------------------------------------------


[[Page 44071]]

    The FAA estimates the following costs to perform the optional 
terminating action or to do any necessary replacement that would be 
required based on the results of the inspections. The agency has no way 
of determining the number of operators that will perform the optional 
terminating action or aircraft that might need this replacement:

                                               On-Condition Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                     Cost per
                    Action                                 Labor cost               Parts cost        product
----------------------------------------------------------------------------------------------------------------
Replace the main propeller shaft..............  8 work-hours x $85 per hour =            $48,360         $49,040
                                                 $680.
Revise the ALS of the MM......................  1 work-hour x $85 per hour = $85               0              85
----------------------------------------------------------------------------------------------------------------

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) 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 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

0
1. The authority citation for part 39 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13  [Amended]

0
2. The FAA amends Sec.  39.13 by:
0
a. Removing Airworthiness Directive 2018-03-13, Amendment 39-19186 (83 
FR 6125, February 13, 2018); and
0
b. Adding the following new airworthiness directive:

General Electric Company: Docket No. FAA-2022-1314; Project 
Identifier AD-2021-00811-E.

(a) Comments Due Date

    The FAA must receive comments on this airworthiness directive 
(AD) by August 25, 2023.

(b) Affected ADs

    This AD replaces AD 2018-03-13, Amendment 39-19186 (83 FR 6125, 
February 13, 2018).

(c) Applicability

    This AD applies to 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.

(d) Subject

    Joint Aircraft System Component (JASC) Code 7210, Turbine Engine 
Reduction Gear.

(e) Unsafe Condition

    This AD was prompted by an in-flight failure of a main propeller 
shaft on a GE CT7-9B model engine, resulting in the loss of the 
propeller. The FAA is issuing this AD to prevent failure of the main 
propeller shaft. The unsafe condition, if not addressed, could cause 
in-flight loss of the propeller, loss of engine thrust control, and 
damage to the airplane.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Required Actions

    (1) For affected CT7-5A2, CT7-5A3, CT7-9B, CT7-9B1, and CT7-9B2 
model engines, using the compliance times specified in Figure 1 to 
paragraph (g)(1) of this AD, perform initial and repetitive visual 
inspections, fluorescent penetrant inspections (FPIs), and 
ultrasonic inspections (USIs) of the main propeller shaft.

Figure 1 to Paragraph (g)(1)--Compliance Times for CT7-5A2, CT7-5A3, 
CT7-9B, CT7-9B1, and CT7-9B2 Model Engines

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[[Page 44072]]

[GRAPHIC] [TIFF OMITTED] TP11JY23.001

    (2) For affected CT7-7A, CT7-7A1, CT7-9C, and CT7-9C3 model 
engines, using the compliance times specified in Figure 2 to 
paragraph (g)(2) of this AD, perform initial and repetitive visual 
inspections, FPIs, and USIs of the main propeller shaft.

Figure 2 to Paragraph (g)(2)--Compliance Times for CT7-7A, CT7-7A1, 
CT7-9C, and CT7-9C3 Model Engines
[GRAPHIC] [TIFF OMITTED] TP11JY23.002

    (3) Perform the visual inspections, FPIs, and USIs required by 
paragraphs (g)(1) and (2) of this AD as follows:
    (i) Prior to performance of the inspections, clean the main 
propeller shaft flange using the Accomplishment Instructions, 
paragraph 3.B., of GE Service Bulletin (SB) CT7-TP 72-0541 R01, 
dated November 18, 2021 (GE SB CT7-TP 72-0541).
    (ii) Visually inspect the main propeller shaft for wear, 
corrosion, and cracking using the Accomplishment Instructions, 
paragraph 3.C.(1), of GE SB CT7-TP 72-0541.
    (iii) Spot-FPI the area on the main propeller shaft flange face 
using the Accomplishment Instructions, paragraph 3.C.(2)(a), of GE 
SB CT7-TP 72-0541.
    (iv) USI the two dowel pin holes of the main propeller shaft 
using the Accomplishment Instructions, paragraph 3.C.(3)(a), of GE 
SB CT7-TP 72-0541.
    (4) If a crack or rejectable indication is found during the 
initial and repetitive visual inspections, FPIs, or USIs required by 
paragraphs (g)(1) through (3) of this AD, before further flight, 
remove the main

[[Page 44073]]

propeller shaft from service and replace it with a part eligible for 
installation.
    (5) For all affected engines, if the main propeller shaft CSN is 
unknown, use the propeller gearbox (PGB) CSN. If the PGB CSN is 
unknown, assume the inspection threshold is exceeded.

(h) Optional Terminating Action

    Accomplishing the actions in paragraphs (h)(1) through (4) of 
this AD, as applicable by engine model, constitutes terminating 
action for the inspections required by paragraphs (g)(1) through (3) 
of this AD.
    (1) For affected CT7-5A2, CT7-5A3, CT7-7A, and CT7-7A1 model 
engines, revise the airworthiness limitations section (ALS) of the 
existing maintenance manual (MM) and the operator's existing 
approved maintenance program or inspection program, as applicable, 
by incorporating the information in Figure 3 to paragraph (h)(1) of 
this AD.
[GRAPHIC] [TIFF OMITTED] TP11JY23.003

    (2) For affected CT7-9B, CT7-9B1, CT7-9B2, CT7-9C, and CT7-9C3 
model engines, revise the ALS of the existing MM and the operator's 
existing approved maintenance program or inspection program, as 
applicable, by incorporating the information in Figure 4 to 
paragraph (h)(2) of this AD.

[[Page 44074]]

[GRAPHIC] [TIFF OMITTED] TP11JY23.004

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    (3) Thereafter, except as provided in paragraph (k) of this AD, 
no alternative inspection times or intervals may be approved for 
this main propeller shaft.
    (4) The optional terminating actions in paragraphs (h)(1) and 
(2) of this AD may be performed by the owner/operator (pilot) 
holding at least a private pilot certificate and must be entered 
into the aircraft records showing compliance with this AD 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.

(i) Definition

    For the purpose of this AD, a ``part eligible for installation'' 
is a main propeller shaft that has been inspected in accordance with 
paragraphs (g)(1) or (2), and (3) of this AD, and there was no crack 
or rejectable indication.

(j) Credit for Previous Actions

    You may take credit for the initial visual inspection, FPI, and 
USI required by paragraphs (g)(1) through (3) of this AD if you 
performed these initial inspections before the effective date of 
this AD in accordance with GE SB CT7-TP 72-0541 R00, dated September 
9, 2021.

(k) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, AIR-520 Continued Operational Safety Branch, 
FAA, has the authority to approve AMOCs for this AD, if requested 
using the procedures found in 14 CFR 39.19. In accordance with 14 
CFR 39.19, send your request to your principal inspector or local 
Flight Standards District Office, as appropriate. If sending 
information directly to the manager of the certification office, 
send it to the attention of the person identified in paragraph (l) 
of this AD and email it to: [email protected].
    (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) Related Information

    For more information about this AD, contact Sungmo Cho, Aviation 
Safety Engineer, FAA, 2200 South 216th Street, Des Moines, WA 98198; 
phone: (781) 238-7241; email: [email protected].

[[Page 44075]]

(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.
    (i) GE Service Bulletin CT7-TP 72-0541 R01, dated November 18, 
2021.
    (ii) [Reserved]
    (3) For GE service information identified in this AD, contact 
General Electric Company, 1 Neumann Way, Cincinnati, OH 45215; 
phone: (513) 552-3272; email:
    ge.com">[email protected]ge.com; website: ge.com.
    (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 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: [email protected], or go to: www.archives.gov/federal-register/cfr/ibr-locations.html.

    Issued on July 3, 2023.
Michael Linegang,
Acting Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2023-14471 Filed 7-10-23; 8:45 am]
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