[Federal Register Volume 89, Number 189 (Monday, September 30, 2024)]
[Proposed Rules]
[Pages 79474-79477]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2024-22064]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2024-2318; Project Identifier MCAI-2023-00981-E]
RIN 2120-AA64


Airworthiness Directives; Austro Engine GmbH Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: The FAA proposes to supersede Airworthiness Directive (AD) 
2023-20-03, which applies to certain Austro Engine GmbH Model E4 and 
E4P engines. AD 2023-20-03 requires repetitive engine oil analysis for 
aluminum content outside the acceptable limits and, if necessary, 
replacement of the pistons, piston rings, con-rods assembly, and 
crankcase or, as an alternative, replacement of the engine core. Since 
the FAA issued AD 2023-20-03, the manufacturer identified errors in the 
lists of affected engines and provided updated information, which 
prompted this proposed AD. This proposed AD would retain the 
requirements of AD 2023-20-03, add compliance times for additional 
affected engine serial numbers, and remove certain engine serial 
numbers from the applicability of the existing AD. The FAA is proposing 
this AD to address the unsafe condition on these products.

DATES: The FAA must receive comments on this NPRM by November 14, 2024.

ADDRESSES: You may send comments, using the procedures found in 14 CFR 
11.43 and 11.45, by any of the following methods:
    <bullet> Federal eRulemaking Portal: Go to regulations.gov. Follow 
the instructions for submitting comments.
    <bullet> Fax: (202) 493-2251.
    <bullet> 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.
    <bullet> 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-2024-2318; 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:
    <bullet> For Austro Engine GmbH material identified in this 
proposed AD, contact Austro Engine GmbH, Rudolf-Diesel-Strasse 11, A-
2700 Weiner Neustadt, Austria; phone: +43 2622 23000; website: 
austroengine.at.
    <bullet> You may view this material 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: Morton Lee, Aviation Safety Engineer, 
FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; phone: (860) 
386-1791; email: <a href="/cdn-cgi/l/email-protection#5a3735282e3534742374363f3f1a3c3b3b743d352c"><span class="__cf_email__" data-cfemail="05686a77716a6b2b7c2b696060456364642b626a73">[email protected]</span></a>.

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-2024-2318; 
Project Identifier MCAI-2023-00981-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 
Morton Lee, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 
410, Westbury, NY 11590. 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 2023-20-03, Amendment 39-22562 (88 FR 76104, 
November 6, 2023) (AD 2023-20-03), for certain Austro Engine GmbH Model 
E4 and E4P engines. AD 2023-20-03 was prompted by an MCAI originated by 
the European Union Aviation Safety Agency (EASA), which is the 
Technical Agent for the Member States of the European Union. EASA 
issued EASA AD 2022-0240R1, dated December 15, 2022 (EASA AD 2022-
0240R1), to address reports of piston failures.
    AD 2023-20-03 requires repetitive engine oil analysis for aluminum 
content outside the acceptable limits and, if necessary, replacement of 
the pistons, piston rings, con-rods assembly, and crankcase or as an 
alternative, replacement of the engine core. The FAA issued AD 2023-20-
03 to prevent piston failure, which could result in loss of oil, loss 
of engine power, and reduced control of the airplane.

Actions Since AD 2023-20-03 Was Issued

    Since the FAA issued AD 2023-20-03, EASA superseded EASA AD 2022-
0240R1 and issued EASA AD 2023-0163, dated August 18, 2023 (EASA AD 
2023-0163) (also referred to as the MCAI). The MCAI states that a 
manufacturer investigation into reports of piston failures determined 
that certain batches of pistons were manufactured with a dimensional 
deviation in the piston pin bore and in the piston diameter, which 
could cause piston failure, with consequent loss of oil, loss of engine 
power, and reduced control of the airplane. To address the unsafe 
condition, EASA issued EASA AD 2022-0240, dated December 6, 2022, to 
specify repetitive oil analyses and

[[Page 79475]]

replacement of the pistons, piston rings, con-rods assembly, and 
crankcase, or as an alternative, replacement of the engine core. EASA 
AD 2022-0240 also prohibited release to service of an airplane until 
receipt of the results for each oil analysis.
    Since EASA AD 2022-0240 was issued, the manufacturer determined 
that aluminum levels outside of the acceptable limits would be found 
during the first oil analysis and would be unlikely to be found during 
subsequent oil analyses. As a result, EASA revised EASA AD 2022-0240 
and issued EASA AD 2022-0240R1 to allow release to service of airplanes 
for a limited number of flight hours immediately after the second and 
subsequent oil samples are taken for analyses.
    Since EASA AD 2022-0240R1 was issued, the manufacturer identified 
errors in the lists of affected engine serial numbers in the service 
information and issued Mandatory Service Bulletin No. MSB-E4-039/2, 
Revision 2, dated July 31, 2023, to revise the list of affected engine 
serial numbers, which prompted EASA to supersede EASA AD 2022-0240R1 
with EASA AD 2023-0163, dated August 18, 2023. Since EASA issued EASA 
AD 2023-0163, the manufacturer revised the service information again 
and issued Mandatory Service Bulletin No. MSB-E4-039/3, Revision 3, 
dated November 22, 2023, to amend the labor efforts section.
    You may examine the MCAI in the AD docket at regulations.gov under 
Docket No. FAA-2024-2318.

Material Incorporated by Reference Under 1 CFR Part 51

    The FAA reviewed Austro Engine GmbH Mandatory Service Bulletin No. 
MSB-E4-039/3, Revision 3, dated November 22, 2023, which identifies 
affected engine serial numbers and specifies procedures for oil 
analysis and replacement of the pistons, piston rings, con-rods 
assembly, crankcase, and engine core.
    This material is reasonably available because the interested 
parties have access to it through their normal course of business or by 
the means identified in the ADDRESSES section.

FAA's Determination

    These products have been approved by the aviation authority of 
another country and are approved for operation in the United States. 
Pursuant to the FAA's bilateral agreement with this State of Design 
Authority, it has notified the FAA of the unsafe condition described in 
the MCAI and material referenced above. The FAA is issuing this NPRM 
after determining that the unsafe condition described previously is 
likely to exist or develop on other products of the same type design.

Proposed AD Requirements in This NPRM

    This proposed AD would retain all of the requirements of AD 2023-
20-03. This proposed AD would also add compliance times for additional 
affected engine serial numbers and remove certain engine serial numbers 
from the applicability of the existing AD, as specified in the material 
already described.

Costs of Compliance

    The FAA estimates that this AD, if adopted as proposed, would 
affect 357 engines installed on aircraft 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
----------------------------------------------------------------------------------------------------------------
Oil analysis........................  1 work-hour x $85 per                $0              $85          $30,345
                                       hour = $85.
----------------------------------------------------------------------------------------------------------------

    The FAA estimates the following costs to do any necessary 
replacements that would be required based on the results of the 
proposed inspection. The agency has no way of determining the number of 
engines that might need these replacements:

                                               On-Condition Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                     Cost per
                    Action                                 Labor cost               Parts cost        product
----------------------------------------------------------------------------------------------------------------
Replace engine core...........................  35 work-hours x $85 per hour =           $15,524         $18,499
                                                 $2,975.
Replace pistons, piston rings, and con-rod      65 work-hours x $85 per hour =             2,216           7,741
 assembly.                                       $5,525.
Replace pistons, piston rings, con-rod          75 work-hours x $85 per hour =             4,141          10,516
 assembly, and crankcase.                        $6,375.
----------------------------------------------------------------------------------------------------------------

    The FAA has included all known costs in its cost estimate. 
According to the manufacturer, however, some of the costs of this 
proposed AD may be covered under warranty, thereby reducing the cost 
impact on affected operators.

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, section 106, describes the 
authority of the FAA Administrator. Subtitle VII, Aviation Programs, 
describes in more detail the scope of the Agency's authority.
    The FAA is issuing this rulemaking under the authority described in 
Subtitle VII, Part A, Subpart III, Section 44701: General requirements. 
Under that section, Congress charges the FAA with promoting safe flight 
of civil aircraft in air commerce by prescribing regulations for 
practices, methods, and procedures the Administrator finds necessary 
for safety in air commerce. This regulation is within the scope of that 
authority because it addresses an unsafe condition that is likely to 
exist or develop on products identified in this rulemaking action.

Regulatory Findings

    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

[[Page 79476]]

responsibilities among the various levels of government.
    For the reasons discussed above, I certify that the proposed 
regulation:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Would not affect intrastate aviation in Alaska, and
    (3) Would 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 AD 2023-20-03, Amendment 39-22562 
(88 FR 76104, November 6, 2023); and
0
b. Adding the following new airworthiness directive:

Austro Engine GmbH: Docket No. FAA-2024-2318; Project Identifier 
MCAI-2023-00981-E.

(a) Comments Due Date

    The FAA must receive comments on this airworthiness directive 
(AD) by November 14, 2024.

(b) Affected ADs

    This AD replaces AD 2023-20-03, Amendment 39-22562 (88 FR 76104, 
November 6, 2023) (AD 2023-20-03).

(c) Applicability

    This AD applies to Austro Engine GmbH Model E4 and E4P engines 
with an engine serial number (ESN) listed in Tables 1, 2, 3, and 4 
of Austro Engine GmbH Mandatory Service Bulletin No. MSB-E4-039/3, 
Revision 3, dated November 22, 2023 (Austro MSB-E4-039/3).

(d) Subject

    Joint Aircraft System Component (JASC) Code 8530, Reciprocating 
Engine Cylinder Section; 8550, Reciprocating Engine Oil System.

(e) Unsafe Condition

    This AD was prompted by reports of piston failures and the 
determination that certain batches of pistons were manufactured with 
a dimensional deviation in the piston pin bore and piston diameter. 
The FAA is issuing this AD to prevent piston failure. The unsafe 
condition, if not addressed, could result in loss of oil, loss of 
engine power, and reduced control of the airplane.

(f) Compliance

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

(g) Required Actions

    (1) For all affected engines, within the applicable compliance 
times specified in Table 1 to paragraph (g)(1) of this AD, perform 
an oil analysis in accordance with paragraph 2., Technical Details, 
Engine Oil Analysis of Austro MSB-E4-039/3, and do not return the 
engine to service until the results of the oil analysis have been 
determined.

   Table 1 to Paragraph (g)(1)--Oil Analysis for All Affected Engines
------------------------------------------------------------------------
          Engine group              Compliance time        Interval
------------------------------------------------------------------------
Group 1 and Group 3 engines that  Within 15 flight    Before exceeding
 do not have an ESN identified     hours (FHs) from    50 FHs since last
 in Table 2 to paragraph (g)(1)    December 11, 2023   oil analysis.
 of this AD.                       (the effective
                                   date of AD 2023-
                                   20-03).
Group 1 and Group 3 engines that  Within 15 FHs from  Before exceeding
 have an ESN identified in Table   the effective       50 FHs since last
 2 to paragraph (g)(1) of this     date of this AD.    oil analysis.
 AD.
Group 2 and Group 4 engines that  Within 25 FHs from  Before exceeding
 do not have an ESN identified     December 11, 2023   100 FHs since
 in Table 2 to paragraph (g)(1)    (the effective      last oil
 of this AD.                       date of AD 2023-    analysis.
                                   20-03).
Group 2 and Group 4 engines that  Within 25 FHs from  Before exceeding
 have an ESN identified in Table   the effective       100 FHs since
 2 to paragraph (g)(1) of this     date of this AD.    last oil
 AD.                                                   analysis.
------------------------------------------------------------------------


                    Table 2 to Paragraph (g)(1)--Affected ESNs Not Included in AD 2023-20-03
----------------------------------------------------------------------------------------------------------------
                  Engine group                          ESN             ESN             ESN             ESN
----------------------------------------------------------------------------------------------------------------
Group 1.........................................      E4-A-06367      E4-A-06248  ..............  ..............
Group 2.........................................      E4-C-06249     E4P-C-06185  ..............  ..............
Group 3.........................................      E4-A-05072      E4-A-05074      E4-A-05075      E4-A-05078
Group 3.........................................      E4-A-05079      E4-A-05080      E4-A-05081      E4-A-05082
Group 3.........................................      E4-A-05083      E4-A-05084      E4-A-05085      E4-A-05086
Group 3.........................................      E4-A-05087  ..............  ..............  ..............
Group 4.........................................      E4-C-00559      E4-C-05089      E4-C-05090      E4-C-05091
Group 4.........................................      E4-C-05092      E4-C-05093      E4-C-05094      E4-C-05096
Group 4.........................................      E4-C-05098      E4-C-05099      E4-C-05100      E4-C-05101
Group 4.........................................      E4-C-05102      E4-C-05103      E4-C-05104      E4-C-05105
Group 4.........................................      E4-C-05106      E4-C-05107      E4-C-05108      E4-C-05109
Group 4.........................................      E4-C-05110      E4-C-05111     E4P-C-06073  ..............
----------------------------------------------------------------------------------------------------------------

    (2) Thereafter, repeat the oil analysis required by paragraph 
(g)(1) of this AD before exceeding the applicable interval specified 
in Table 1 to paragraph (g)(1) of this AD.
    (3) Following each repetitive oil analysis, the engine may be 
returned to service for no more than the applicable interval 
specified in Table 1 to paragraph (g)(1) of this AD, until receipt 
of the oil analysis result.
    (4) If the result of any oil analysis required by paragraph 
(g)(1) of this AD indicates the aluminum content of the oil is 
greater than the limit specified in paragraph 2., Technical Details, 
Engine Oil Analysis, Table 5--Oil

[[Page 79477]]

check analysis--Aluminum PPM allowable; of Austro MSB-E4-039/3, 
before further flight, replace the pistons, piston rings, con-rods 
assembly, and crankcase, or replace the engine core in accordance 
with paragraph 2., Technical Details, Engine core replacement; or 
Pistons, piston rings, crankcase and con-rod assy replacement; as 
applicable, of Austro MSB-E4-039/3.
    (5) For Group 3 and Group 4 engines, within the applicable 
compliance times specified in Table 3 to paragraph (g)(5) of this 
AD, replace the pistons, piston rings, and con-rods assembly, or 
replace the engine core in accordance with paragraph 2., Technical 
Details, Engine core replacement; or Pistons, piston rings and con-
rod assy replacement, as applicable, of Austro MSB-E4-039/3.

   Table 3 to Paragraph (g)(5)--Replacement for Group 3 and 4 Engines
------------------------------------------------------------------------
              Engine group                       Compliance time
------------------------------------------------------------------------
Group 3 engines that do not have an ESN  Before exceeding 900 FHs since
 identified in Table 2 to paragraph       new, or within 15 FHs after
 (g)(1) of this AD.                       December 11, 2023 (the
                                          effective date of AD 2023-20-
                                          03), whichever occurs later.
Group 3 engines that have an ESN         Before exceeding 900 FHs since
 identified in Table 2 to paragraph       new, or within 15 FHs after
 (g)(1) of this AD.                       the effective date of this AD,
                                          whichever occurs later
Group 4 engines that do not have an ESN  Before exceeding 1,000 FHs
 identified in Table 2 to paragraph       since new, or within 25 FHs
 (g)(1) of this AD.                       after December 11, 2023 (the
                                          effective date of AD 2023-20-
                                          03), whichever occurs later.
Group 4 engines that have an ESN         Before exceeding 1,000 FHs
 identified in Table 2 to paragraph       since new, or within 25 FHs
 (g)(1) of this AD.                       after the effective date of
                                          this AD, whichever occurs
                                          later.
------------------------------------------------------------------------

    Note 1 to paragraph (g)(5): FHs since new indicated in Table 3 
to paragraph (g)(5) of this AD are FHs accumulated by the engine 
since first installation on an airplane or since last overhaul as of 
December 11, 2023 (the effective date of AD 2023-20-03) for Group 3 
and 4 engines that do not have an ESN identified in Table 2 to 
paragraph (g)(1) of this AD, or as of the effective date of this AD 
for Group 3 and 4 engines that have an ESN identified in Table 2 to 
paragraph (g)(1) of this AD.

(h) Terminating Action

    (1) Replacement of the pistons, piston rings, con-rods assembly, 
and crankcase, or replacement of the engine core, as specified in 
paragraph (g)(4) of this AD, constitutes terminating action for the 
repetitive oil analysis required by paragraph (g)(2) of this AD.
    (2) Replacement of the pistons, piston rings, and con-rods 
assembly, or replacement of the engine core, as specified in 
paragraph (g)(5) of this AD, constitutes terminating action for the 
repetitive oil analysis required by paragraph (g)(2) of this AD.

(i) Definitions

    For the purpose of this AD:
    (1) Group 1 engines are engines having an ESN listed in Table 1 
of No. MSB-E4-039/3.
    (2) Group 2 engines are engines having an ESN listed in Table 2 
of No. MSB-E4-039/3.
    (3) Group 3 engines are engines having an ESN listed in Table 3 
of No. MSB-E4-039/3.
    (4) Group 4 engines are engines having an ESN listed in Table 4 
of No. MSB-E4-039/3.

(j) Credit for Previous Actions

    (1) You may take credit for the actions required by paragraph 
(g)(1), (4), or (5) of this AD, if you performed those actions 
before December 11, 2023 (the effective date of AD 2023-20-03) using 
Austro Engine GmbH Mandatory Service Bulletin No. MSB-E4-039/0, 
dated October 24, 2022.
    (2) You may take credit for the actions required by paragraph 
(g)(1), (4), or (5) of this AD if you performed those actions before 
the effective date of this AD using Austro Engine GmbH Mandatory 
Service Bulletin No. MSB-E4-039/2, Revision 2, dated July 26, 2023.

(k) No Return of Parts/Reporting Requirement

    Although the service information specifies returning certain 
parts and submitting certain information to the manufacturer, this 
AD does not include those requirements.

(l) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, International Validation Branch, FAA, has the 
authority to approve AMOCs for this AD, if requested using the 
procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, 
send your request to your principal inspector or local Flight 
Standards District Office, as appropriate. If sending information 
directly to the manager of the International Validation Branch, send 
it to the attention of the person identified in paragraph (m)(1) of 
this AD and email to <a href="/cdn-cgi/l/email-protection#581915171b183e3939763f372e"><span class="__cf_email__" data-cfemail="90d1dddfd3d0f6f1f1bef7ffe6">[email protected]</span></a>.
    (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.

(m) Additional Information

    (1) For more information about this AD, contact Morton Lee, 
Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, 
Westbury, NY 11590; phone: (860) 386-1791; email: 
<a href="/cdn-cgi/l/email-protection#6c01031e1803024215420009092c0a0d0d420b031a"><span class="__cf_email__" data-cfemail="610c0e13150e0f4f184f0d0404210700004f060e17">[email protected]</span></a>.
    (2) Material identified in this AD that is not incorporated by 
reference is available at the address specified in paragraph (n)(3) 
of this AD.

(n) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference (IBR) of the material listed in this 
paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
    (2) You must use this material as applicable to do the actions 
required by this AD, unless the AD specifies otherwise.
    (i) Austro Engine GmbH Mandatory Service Bulletin No. MSB-E4-
039/3, Revision 3, dated November 22, 2023.
    (ii) [Reserved]
    (3) For Austro Engine GmbH material identified in this AD, 
contact Austro Engine GmbH, Rudolf-Diesel-Strasse 11, A-2700 Weiner 
Neustadt, Austria; phone: +43 2622 23000; website: austroengine.at.
    (4) You may view this material at FAA, Airworthiness Products 
Section, Operational Safety Branch, 1200 District Avenue, 
Burlington, MA 01803. For information on the availability of this 
material at the FAA, call (817) 222-5110.
    (5) You may view this material at the National Archives and 
Records Administration (NARA). For information on the availability 
of this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations or email <a href="/cdn-cgi/l/email-protection#85e3f7abecebf6f5e0e6f1eceaebc5ebe4f7e4abe2eaf3"><span class="__cf_email__" data-cfemail="b7d1c599ded9c4c7d2d4c3ded8d9f7d9d6c5d699d0d8c1">[email protected]</span></a>.

    Issued on September 23, 2024.
Steven W. Thompson,
Acting Deputy Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2024-22064 Filed 9-27-24; 8:45 am]
BILLING CODE 4910-13-P


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