
[Federal Register Volume 88, Number 186 (Wednesday, September 27, 2023)]
[Proposed Rules]
[Pages 66307-66310]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2023-20399]



[[Page 66307]]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2023-1882; Project Identifier MCAI-2023-00651-T]
RIN 2120-AA64


Airworthiness Directives; Airbus SAS Airplanes

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) 
2022-07-15, which applies to all Airbus SAS Model A318, A319, A320, and 
A321 series airplanes. AD 2022-07-15 requires replacing affected 
braking and steering control units (BSCUs) and revising the operator's 
existing FAA-approved minimum equipment list (MEL). Since the FAA 
issued AD 2022-07-15, a type 1 relay combined with an affected BSCU 
would induce BSCU freezing. This proposed AD would remove certain 
airplanes from the applicability, retain the requirements of AD 2022-
07-15, require an inspection for the relay type installed and 
replacement of type 1 relays with type 2 relays, and prohibit the 
installation of affected relays at certain locations, limit the 
installation of affected BSCUs on certain airplanes, and prohibit the 
installation of affected BSCUs for certain other airplanes, 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 proposed AD by November 
13, 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-2023-1882; 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 the EASA AD identified in this NPRM, contact EASA, 
Konrad-Adenauer-Ufer 3, 50668 Cologne, Germany; telephone +49 221 8999 
000; email [email protected]; 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-2023-1882.
     For Airbus service information identified in this NPRM, 
contact Airbus SAS, Airworthiness Office--EIAS, Rond-Point Emile 
Dewoitine No: 2, 31700 Blagnac Cedex, France; telephone +33 5 61 93 36 
96; fax +33 5 61 93 44 51; email airbus.com">account.airworth-eas@airbus.com; 
website airbus.com.
     You may view this material 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.

FOR FURTHER INFORMATION CONTACT: Timothy Dowling, Aviation Safety 
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; 
phone 206-231-3667; 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 ADDRESSES. Include ``Docket No. FAA-2023-1882; Project Identifier 
MCAI-2023-00651-T'' 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 
this 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 
Timothy Dowling, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, 
Suite 410, Westbury, NY 11590; phone 206-231-3667; email 
[email protected]. 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 2022-07-15, Amendment 39-22003 (87 FR 22438, 
April 15, 2022), for all Airbus SAS Model A318-111, -112, -121, and -
122 airplanes; Model A319-111, -112, -113, -114, -115, -131, -132, -
133, -151N, -153N, and -171N airplanes; Model A320-211, -212, -214, -
216, -231, -232, -233, -251N, -252N, -253N, -271N, -272N, -273N 
airplanes; and Model A321-111, -112, -131, -211, -212, -213, -231, -
232, -251N, -251NX, -252N, -252NX, -253N, -253NX, -271N, -271NX, -272N, 
and -272NX airplanes. AD 2022-07-15 was prompted by an MCAI originated 
by EASA, which is the Technical Agent for the Member States of the 
European Union. EASA issued AD 2022-0032, dated March 3, 2022 (EASA AD 
2022-0032), to correct an unsafe condition.
    AD 2022-07-15 requires replacing affected BSCUs and revising the 
operator's existing FAA-approved MEL. The FAA issued AD 2022-07-15 to 
address loss of braking performance with significant increase in 
airplane stopping distance, possibly resulting in runway excursion.

Actions Since AD 2022-07-15 Was Issued

    Since the FAA issued AD 2022-07-15, EASA superseded AD 2022-0032 
and issued EASA AD 2023-0093, dated May 5, 2023, which was subsequently

[[Page 66308]]

revised. EASA AD 2023-0093R1, dated May 15, 2023 (EASA AD 2022-0093R1) 
(also referred to as the MCAI), retains the requirements of EASA AD 
2023-0032 and requires replacement of type 1 relays with type 2 relays.
    The MCAI noted that BSCU channel failures could induce, in the 
event of dual channel failures, loss of anti-skid function together 
with the reversion to the alternate braking mode, and loss of nose 
wheel steering, and lead to loss of braking performance with 
significant increase in airplane stopping distance, possibly resulting 
in runway excursion.
    The MCAI states that further investigation identified a type 1 
relay installed in a position where a type 2 relay should have been 
installed. The combination of a type 1 relay with an affected BSCU 
could induce BSCU freezing. EASA therefore determined that it is 
necessary to replace type 1 relays with type 2 relays.
    The MCAI also states that type 1 relays are no longer installed on 
Model A320 Current Engine Option (CEO) airplanes (i.e., Model A318 
series airplanes; A319-111, -112, -113, -114, -115, -131, -132, and -
133 airplanes; A320-211, -212, -214, -216, -231, -232, and -233 
airplanes; and A321-111, -112, -131, -211, -212, -213, -231, and -232 
airplanes). Type 1 relays were required to be replaced on Model A320 
CEO airplanes by AD 96-04-06, Amendment 39-9518 (61 FR 6927, February 
23, 1996). AD 96-04-06 corresponded to DGAC France AD F-1993-163-043, 
dated September 29, 1993. Model A320 CEO airplanes are therefore not 
included in the applicability of this proposed AD.
    Further, EASA stated that some relays installed at functional item 
number (FIN) locations 24GG and 25GG were not in conformity with the 
Airplane Inspection Report on certain airplanes.
    In addition, it was determined that certain airplanes have been 
delivered with a BSCU P/N E21327107.

Explanation of Retained Requirements

    Although this proposed AD does not explicitly restate the 
requirements of AD 2022-07-15, this proposed AD would retain all the 
requirements of AD 2022-07-15. Those requirements are referenced in 
EASA AD 2023-0093R1, which, in turn, is referenced in paragraph (g) of 
this proposed AD.

Related Service Information Under 1 CFR Part 51

    EASA AD 2023-0093R1 specifies procedures for replacing affected 
BSCUs if a fault signature is triggered, and implementing the 
instructions of master minimum equipment list (MMEL) updates on the 
basis of which the operator's existing MEL must be amended-that is, 
procedures for revising the operator's existing FAA-approved MEL with 
the provisions in the MMEL updates specified in the EASA AD. EASA AD 
2023-0093R1 also specifies procedures for a general visual inspection 
of the FINs 24GG and 25GG to identify the relay type installed, and 
replacement of each type 1 relay with a type 2 relay. EASA AD 2023-
0093R1 also limits the installation of affected parts.
    Airbus Alert Operators Transmission A32N025-22, Rev 01, dated May 
10, 2023, including Appendixes 1 through 3, dated May 2023, defines 
BSCU fault signatures that may be triggered on the airplane, and 
specifies procedures for replacing affected parts, among other actions.
    This proposed AD would also require Airbus Alert Operators 
Transmission A32N025-22, Rev 00, dated February 24, 2022, including 
Appendixes 1 through 4, dated February 21, 2022, which the Director of 
the Federal Register approved for incorporation by reference as of May 
2, 2022 (87 FR 22438, April 15, 2022).
    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

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

Proposed AD Requirements in This NPRM

    This proposed AD would retain all requirements of AD 2022-07-15. 
This proposed AD would remove airplanes from the applicability and 
require accomplishing the actions specified in EASA AD 2023-0093R1 
described previously, except for any differences identified as 
exceptions in the regulatory text of this proposed AD.

Compliance With MEL Revisions

    EASA AD 2023-0093R1 requires operators to ``inform all flight 
crews'' of revisions to the MEL, and thereafter to ``operate the 
airplane accordingly.'' However, this proposed AD would not 
specifically require those actions as those actions are already 
required by FAA regulations. FAA regulations (14 CFR 121.628 (a)(2)) 
require operators to provide pilots with access to all of the 
information contained in the operator's MEL. Furthermore, 14 CFR 
121.628 (a)(5) requires airplanes to be operated under all applicable 
conditions and limitations contained in the operator's MEL. Therefore, 
including a requirement in this proposed AD to operate the airplane 
according to the revised MEL would be redundant and unnecessary.

Explanation of Required Compliance Information

    In the FAA's ongoing efforts to improve the efficiency of the AD 
process, the FAA developed a process to use some civil aviation 
authority (CAA) ADs as the primary source of information for compliance 
with requirements for corresponding FAA ADs. The FAA has been 
coordinating this process with manufacturers and CAAs. As a result, the 
FAA proposes to incorporate EASA AD 2023-0093R1 by reference in this 
AD. This proposed AD would, therefore, require compliance with EASA AD 
2023-0093R1 entirety through that incorporation, except for any 
differences identified as exceptions in the regulatory text of this 
proposed AD. Using common terms that are the same as the heading of a 
particular section in EASA AD 2023-0093R1 does not mean that operators 
need comply only with that section. For example, where the AD 
requirement refers to ``all required actions and compliance times,'' 
compliance with this AD requirement is not limited to the section 
titled ``Required Action(s) and Compliance Time(s)'' in EASA AD 2023-
0093R1. Service information required by EASA AD 2023-0093R1 for 
compliance will be available at regulations.gov under Docket No. FAA-
2023-1882 after the FAA final rule is published.

Costs of Compliance

    The FAA estimates that this AD, if adopted as proposed, would 
affect 349 airplanes of U.S. registry. The FAA estimates the following 
costs to comply with this proposed AD:

[[Page 66309]]



                                      Estimated Costs for Required Actions
----------------------------------------------------------------------------------------------------------------
                                                                                                 Cost on U.S.
              Action                    Labor cost        Parts cost      Cost per product        operators
----------------------------------------------------------------------------------------------------------------
Retained actions from AD 2022-07-  Up to 5 work-hours               $0  Up to $425.........  Up to $148,325.
 15.                                x $85 per hour =
                                    $425.
Relay inspection and replacement   Up to 9 work-hours                0  Up to 765..........  Up to 266,985.
 (new proposed actions).            x $85 per hour =
                                    $765.
----------------------------------------------------------------------------------------------------------------

    According to the manufacturer, some or all of the costs of this 
proposed AD may be covered under warranty, thereby reducing the cost 
impact on affected individuals. The FAA does not control warranty 
coverage for affected individuals. As a result, the FAA has included 
all known costs in the cost estimate.

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) 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) 2022-07-15, Amendment 39-22003 
(87 FR 22438, April 15, 2022); and
0
b. Adding the following new AD:

Airbus SAS: Docket No. FAA-2023-1882; Project Identifier MCAI-2023-
00651-T.

(a) Comments Due Date

    The FAA must receive comments on this airworthiness directive 
(AD) by November 13, 2023.

 (b) Affected ADs

    This AD replaces AD 2022-07-15, Amendment 39-22003 (87 FR 22438, 
April 15, 2022) (AD 2022-07-15).

 (c) Applicability

    This AD applies to the Airbus SAS airplanes, certificated in any 
category, identified in paragraphs (c)(1) through (3) of this AD.
    (1) All Model A319-151N, A319-153N, and A319-171N airplanes.
    (2) All Model A320-251N, A320-252N, A320-253N, A320-271N, A320-
272N, and A320-273N airplanes.
    (3) All Model A321-251N, A321-251NX, A321-252N, A321-252NX, 
A321-253N, A321-253NX, A321-271N, A321-271NX, A321-272N, and A321-
272NX airplanes.

 (d) Subject

    Air Transport Association (ATA) of America Code 32, Landing 
Gear; and America Code 92, Electrical System Installation.

 (e) Unsafe Condition

    This AD was prompted by the detection of several channel 
failures on the braking and steering control unit (BSCU), inducing, 
in case of dual channel failures, loss of anti-skid function 
together with the reversion to the alternate braking mode, and loss 
of nose wheel steering. This AD was further prompted by the 
determination that a type 1 relay combined with an affected BSCU 
could induce BSCU freezing. The FAA is issuing this AD to address 
these conditions, which could lead to loss of braking performance 
with significant increase in airplane stopping distance, possibly 
resulting in runway excursion.

 (f) Compliance

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

 (g) Requirements

    Except as specified in paragraph (h) of this AD: Comply with all 
required actions and compliance times specified in, and in 
accordance with, European Union Aviation Safety Agency (EASA) 2023-
0093R1, dated May 15, 2023 (EASA AD 2023-0093R1).

 (h) Exceptions to EASA AD 2023-0093R1

    (1) Where EASA AD 2023-0093R1 refers to ``10 March 2022 [the 
effective date of EASA AD 2022-0032 at original issue],'' this AD 
requires using May 2, 2022 (the effective date of AD 2022-07-15).
    (2) Where EASA AD 2023-0093R1 refers to its effective date, this 
AD requires using the effective date of this AD.
    (3) Where EASA AD 2023-0093R1 defines ``the AOT 1'' as ``Airbus 
Alert Operators Transmission (AOT 1) A32N025-22,'' this AD requires 
using Airbus Alert Operators Transmission A32N025-22, Rev 00, dated 
February 24, 2022, including Appendixes 1 through 4, dated February 
21, 2022, or Airbus Alert Operators Transmission A32N025-22, Rev 01, 
dated May 10, 2023, including Appendixes 1 through 3, dated May 
2023.
    (4) Where paragraphs (2) and (3) of EASA AD 2023-0093R1 specify 
``in accordance with the instructions of the AOT 1,'' replace those 
words with ``in accordance with the `Remove and replace BSCU P/N 
E21327307' step in paragraph 5.6., `Instructions,' of Airbus Alert 
Operators Transmission A32N025-22, Rev 00, dated February 24, 2022, 
including Appendixes 1 through 4, dated February 21, 2022, or of 
Airbus Alert Operators Transmission A32N025-22, Rev 01, dated May 
10, 2023, including Appendixes 1 through 3, dated May 2023.'' No 
other actions in Airbus Alert Operators Transmission A32N030-23, Rev 
00, dated February 27, 2023, including Appendixes 1 and 2, dated 
February 21, 2023 (referenced in EASA AD 2023-0093R1 and not 
incorporated by reference in this AD), or Airbus Alert Operators 
Transmission A32N025-22, Rev 01, dated May 10, 2023, including

[[Page 66310]]

Appendixes 1 through 3, dated May 2023, are required for compliance 
for the replacement.
    (5) Where paragraph (4) of EASA AD 2023-0093R1 requires 
operators to ``implement the instructions of the MMEL [master 
minimum equipment list] update,'' this AD requires replacing those 
words with ``implement the operator's existing FAA-approved minimum 
equipment list (MEL) with the provisions specified in `The MMEL 
update' as identified in EASA AD 2023-0093R1.''
    (6) Where paragraph (4) of EASA AD 2023-0093R1 specifies to 
``inform all flight crews, and, thereafter, operate the airplane 
accordingly,'' this AD does not require those actions as those 
actions are already required by existing FAA operating regulations.
    (7) This AD does not adopt the ``Remarks'' section of EASA AD 
2023-0093R1.

 (i) No Reporting Requirement

    Although certain service information specified in EASA AD 2023-
0093R1 specifies to report certain information and send affected 
parts to the manufacturer, this AD does not require those actions.

 (j) 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 (k) of this AD. Information may be emailed to: [email protected].
    (i) Before using any approved AMOC, notify your appropriate 
principal inspector, or lacking a principal inspector, the manager 
of the responsible Flight Standards Office.
    (ii) AMOCs approved previously for AD 2022-07-15 are approved as 
AMOCs for the corresponding provisions of EASA AD 2023-0093R1 that 
are required by paragraph (g) of this AD.
    (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 Airbus SAS's EASA Design 
Organization Approval (DOA). If approved by the DOA, the approval 
must include the DOA-authorized signature.
    (3) Required for Compliance (RC): Except as required by 
paragraph (j)(2) of this AD, if any service information contains 
procedures or tests that are identified as RC, those procedures and 
tests must be done to comply with this AD; any procedures or tests 
that are not identified as RC are recommended. Those procedures and 
tests that are not identified as RC may be deviated from using 
accepted methods in accordance with the operator's maintenance or 
inspection program without obtaining approval of an AMOC, provided 
the procedures and tests identified as RC can be done and the 
airplane can be put back in an airworthy condition. Any 
substitutions or changes to procedures or tests identified as RC 
require approval of an AMOC.

 (k) Additional Information

    For more information about this AD, contact Timothy Dowling, 
Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, 
Westbury, NY 11590; phone 206-231-3667; email 
[email protected].

 (l) 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 
[DATE 35 DAYS AFTER PUBLICATION OF THE FINAL RULE].
    (i) European Union Aviation Safety Agency (EASA) AD 2023-0093R1, 
dated May 15, 2023.
    (ii) Airbus Alert Operators Transmission A32N025-22, Rev 01, 
dated May 10, 2023, including Appendixes 1 through 3, dated May 
2023.
    (4) The following service information was approved for IBR on 
May 2, 2022 (87 FR 22438, April 15, 2022).
    (i) Airbus Alert Operators Transmission A32N025-22, Rev 00, 
dated February 24, 2022, including Appendixes 1 through 4, dated 
February 21, 2022.
    (ii) [Reserved]
    (5) For EASA AD 2023-0093R1, contact EASA, Konrad-Adenauer-Ufer 
3, 50668 Cologne, Germany; telephone +49 221 8999 000; email 
[email protected]; website easa.europa.eu. You may find this EASA 
AD on the EASA website at ad.easa.europa.eu.
    (6) For Airbus service information identified in this AD, 
contact Airbus SAS, Airworthiness Office--EIAS, Rond-Point Emile 
Dewoitine No: 2, 31700 Blagnac Cedex, France; telephone +33 5 61 93 
36 96; fax +33 5 61 93 44 51; email airbus.com">account.airworth-eas@airbus.com; 
website airbus.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 [email protected], or go to: www.archives.gov/federal-register/cfr/ibr-locations.html.

    Issued on September 15, 2023.
Victor Wicklund,
Deputy Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2023-20399 Filed 9-26-23; 8:45 am]
BILLING CODE 4910-13-P


