Airworthiness Directives; General Electric Company Engines, 44068-44075 [2023-14471]
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44068
Federal Register / Vol. 88, No. 131 / Tuesday, July 11, 2023 / Proposed Rules
‘‘Ref. Publications’’ section of EASA AD
2023–0058.
(l) Terminating Action for Certain Actions in
AD 2010–26–05
Accomplishing the actions required by
paragraph (g) or (i) of this AD terminates all
requirements of paragraph (g)(1) of AD 2010–
26–05 for Dassault Aviation Model
MYSTERE–FALCON 20–C5, 20–D5, 20–E5,
and 20–F5 airplanes, except those on which
the Dassault Aviation MYSTERE–FALCON
20 Supplemental Structural Inspection
Program has been embodied, only.
(m) 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 International Validation Branch, send
it to the attention of the person identified in
paragraph (n) of this AD. Information may be
emailed 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 EASA; or Dassault
Aviation’s EASA Design Organization
Approval (DOA). If approved by the DOA,
the approval must include the DOAauthorized signature.
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(n) Additional Information
For more information about this AD,
contact Tom Rodriguez, Aviation Safety
Engineer, 1600 Stewart Avenue, Suite 410,
Westbury, NY 11590; phone: 206–231–3226;
email: tom.rodriguez@faa.gov.
(o) Material Incorporated by Reference
(1) The Director of the Federal Register
approved the incorporation by reference
(IBR) of the service information listed in this
paragraph under 5 U.S.C. 552(a) and 1 CFR
part 51.
(2) You must use this service information
as applicable to do the actions required by
this AD, unless this AD specifies otherwise.
(3) The following service information was
approved for IBR on August 15, 2023.
(i) European Union Aviation Safety Agency
(EASA) AD 2023–0058, dated March 16,
2023.
(ii) [Reserved]
(4) The following service information was
approved for IBR on April 2, 2020 (85 FR
11280, February 27, 2020).
(i) Chapter 5–40–00, Airworthiness
Limitations, of the Dassault Falcon 20
Retrofit 731 Maintenance Manual, Revision
13, dated January 1, 2019.
(ii) [Reserved]
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(5) For EASA AD 2023–0058, contact
EASA, Konrad-Adenauer-Ufer 3, 50668
Cologne, Germany; telephone +49 221 8999
000; email ADs@easa.europa.eu; website
easa.europa.eu. You may find this EASA AD
on the EASA website at ad.easa.europa.eu.
(6) For service information identified in
this AD, contact Dassault Falcon Jet
Corporation, Teterboro Airport, P.O. Box
2000, South Hackensack, NJ 07606;
telephone 201–440–6700; website
dassaultfalcon.com.
(7) 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.
(8) You may view this service information
that is incorporated by reference at the
National Archives and Records
Administration (NARA). For information on
the availability of this material at NARA,
email fr.inspection@nara.gov, or go to:
www.archives.gov/federal-register/cfr/ibrlocations.html.
Issued on July 6, 2023.
Michael Linegang,
Acting Director, Compliance & Airworthiness
Division, Aircraft Certification Service.
[FR Doc. 2023–14611 Filed 7–10–23; 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]
RIN 2120–AA64
Airworthiness Directives; General
Electric Company Engines
Federal Aviation
Administration (FAA), DOT.
ACTION: Supplemental notice of
proposed rulemaking (SNPRM).
AGENCY:
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.
SUMMARY:
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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:
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.
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:
ADDRESSES:
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
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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.
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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 inflight 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
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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.
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44069
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
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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.
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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
Action
Labor cost
Parts cost
Cost per
product
Cost on U.S.
operators
Visually inspect, FPI, and USI the main propeller shaft.
2 work-hours × $85 per hour = $170 .............
$0
$170
$29,920
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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
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terminating action or aircraft that might
need this replacement:
ON-CONDITION COSTS
Action
Labor cost
Replace the main propeller shaft .................................
Revise the ALS of the MM ...........................................
8 work-hours × $85 per hour = $680 ...........................
1 work-hour × $85 per hour = $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
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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,
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(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
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:
a. Removing Airworthiness Directive
2018–03–13, Amendment 39–19186 (83
FR 6125, February 13, 2018); and
■ 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.
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Parts cost
$48,360
0
Cost per
product
$49,040
85
(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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(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
(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
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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.
(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.
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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
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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,
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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: 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.
(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: Sungmo.D.Cho@faa.gov.
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BILLING CODE 4910–13–C
Federal Register / Vol. 88, No. 131 / Tuesday, July 11, 2023 / Proposed Rules
(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:
aviation.fleetsupport@ae.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: fr.inspection@nara.gov, or go to:
www.archives.gov/federal-register/cfr/ibrlocations.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]
BILLING CODE 4910–13–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA–2023–1410; Project
Identifier MCAI–2022–01517–E]
RIN 2120–AA64
Airworthiness Directives; Rolls-Royce
Deutschland Ltd & Co KG Engines
Federal Aviation
Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking
(NPRM).
AGENCY:
The FAA proposes to
supersede Airworthiness Directive (AD)
2013–26–10, which applies to certain
Rolls-Royce Deutschland Ltd & Co KG
(RRD) Model RB211–524G2–19, RB211–
524G3–19, RB211–524H–36, and
RB211–524H2–19 engines. AD 2013–
26–10 requires a one-time reduction in
the cyclic life of certain high-pressure
compressor (HPC) rotor stage 1 and
stage 2 disks, and removal of disks that
exceed the reduced cycle life. Since the
FAA issued AD 2013–26–10, the
manufacturer has revised the engine
ddrumheller on DSK120RN23PROD with PROPOSALS1
SUMMARY:
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time limits manual (TLM), introducing
new and more restrictive instructions.
This proposed AD would require
revisions to the airworthiness
limitations section (ALS) of the
operator’s existing approved engine
maintenance or inspection program, as
applicable, as specified in a European
Union Aviation Safety Agency (EASA)
AD, which is proposed for incorporation
by reference (IBR). The FAA is
proposing this AD to address the unsafe
condition on these products.
DATES: The FAA must receive comments
on this NPRM 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 under Docket
No. FAA–2023–1410; 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 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. It is also available at
regulations.gov under Docket No. FAA–
2023–1410.
• 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: sungmo.d.cho@faa.gov.
SUPPLEMENTARY INFORMATION:
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44075
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–2023–1410; Project Identifier
MCAI–2022–01517–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 amend the proposal
because of those comments.
Except for Confidential Business
Information (CBI) as described in the
following paragraph, and other
information as described in 14 CFR
11.35, the FAA will post all comments
received, without change, to
regulations.gov, including any personal
information you provide. The agency
will also post a report summarizing each
substantive verbal contact received
about this NPRM.
Confidential Business Information
CBI is commercial or financial
information that is both customarily and
actually treated as private by its owner.
Under the Freedom of Information Act
(FOIA) (5 U.S.C. 552), CBI is exempt
from public disclosure. If your
comments responsive to this NPRM
contain commercial or financial
information that is customarily treated
as private, that you actually treat as
private, and that is relevant or
responsive to this NPRM, it is important
that you clearly designate the submitted
comments as CBI. Please mark each
page of your submission containing CBI
as ‘‘PROPIN.’’ The FAA will treat such
marked submissions as confidential
under the FOIA, and they will not be
placed in the public docket of this
NPRM. Submissions containing CBI
should be sent to 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 AD 2013–26–10,
Amendment 39–17719 (79 FR 1315,
January 8, 2014) (AD 2013–26–10), for
all RRD Model RB211–524G2–19,
RB211–524G3–19, RB211–524H–36, and
RB211–524H2–19 engines. AD 2013–
26–10 was prompted by an MCAI
originated by EASA, which is the
Technical Agent for the Member States
of the European Union. EASA issued
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]]>Agencies
[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]
-----------------------------------------------------------------------
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).
-----------------------------------------------------------------------
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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