[Federal Register Volume 88, Number 146 (Tuesday, August 1, 2023)]
[Rules and Regulations]
[Pages 50011-50014]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2023-16192]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2023-0015; Project Identifier AD-2022-01281-T; 
Amendment 39-22496; AD 2023-13-11]
RIN 2120-AA64


Airworthiness Directives; AVOX Systems Inc. (Formerly Scott 
Aviation) Oxygen Cylinder and Valve Assemblies; and Oxygen Valve 
Assemblies

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2022-04-
09, which applied to certain AVOX Systems Inc. (formerly Scott 
Aviation) oxygen cylinder and valve assemblies; and oxygen valve 
assemblies; installed on but not limited to various transport 
airplanes. AD 2022-04-09 required an inspection of the oxygen valve 
assemblies, and oxygen cylinder and valve assemblies, to determine the 
serial number; for certain assemblies and parts, a detailed inspection 
of the gap between the bottom of the packing retainer and top of the 
valve body on the assemblies; and replacement of assemblies having 
unacceptable gaps. This AD was prompted by a determination that 
additional assemblies and parts are affected by the unsafe condition. 
This AD requires an inspection of the oxygen valve assemblies, and 
oxygen cylinder and valve assemblies, to determine the serial number of 
the valve, cylinder, and entire assembly; for certain assemblies and 
parts, a detailed inspection for correct spacing of the gap between the 
bottom of the packing retainer and top of the valve body on the 
assemblies and replacement of assemblies having unacceptable gaps. This 
AD also limits the installation of affected parts under certain 
conditions and reporting inspection results and returning certain 
assemblies to the manufacturer. The FAA is issuing this AD to address 
the unsafe condition on these products.

DATES: This AD is effective September 5, 2023.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of September 5, 
2023.

ADDRESSES: 
    AD Docket: You may examine the AD docket at regulations.gov under 
Docket No. FAA-2023-0015; or in person at Docket Operations between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD 
docket contains this final rule, any comments received, and other 
information. The address for Docket Operations is U.S. Department of 
Transportation, Docket Operations, M-30, West Building Ground Floor, 
Room W12-140, 1200 New Jersey Avenue SE, Washington, DC 20590.
    Material Incorporated by Reference:
     For service information identified in this final rule, 
contact AVOX Systems Inc., 225 Erie Street, Lancaster, NY 14086; 
telephone 716-683-5100; website safranaerosystems.com.
     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. It is also available at 
regulations.gov under Docket No. FAA-2023-0015.

FOR FURTHER INFORMATION CONTACT: Elizabeth Dowling, Aviation Safety 
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; 
telephone 516-228-7300; email [email protected].

SUPPLEMENTARY INFORMATION: 

Background

    The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 
CFR part 39 to supersede AD 2022-04-09, Amendment 39-21951 (87 FR 
10958, February 28, 2022) (AD 2022-04-09). AD 2022-04-09 applied to 
certain AVOX Systems Inc. (formerly Scott Aviation) oxygen cylinder and 
valve assemblies, and oxygen valve assemblies, installed on but not 
limited to various transport airplanes. AD 2022-04-09 was prompted by 
reports of cylinder and valve assemblies having oxygen leakage from the 
valve assembly vent hole, caused by the absence of a guide that 
maintains appropriate spacing between certain parts. The NPRM published 
in the Federal Register on January 27, 2023 (88 FR 5278). The NPRM was 
prompted by a determination that additional assemblies and parts are 
affected by the unsafe condition. In the NPRM, the FAA proposed to 
continue to require an inspection of the oxygen valve assemblies, and 
oxygen cylinder and valve assemblies, to determine the serial number of 
the valve, cylinder, and entire assembly. For assemblies and parts with 
certain serial numbers, the FAA also proposed to continue to require a 
detailed inspection for correct spacing of the gap between the bottom 
of the packing retainer and top of the valve body on the assemblies, 
and replacement of assemblies having unacceptable gaps. The NPRM also 
proposed to limit the installation of affected parts under certain 
conditions and reporting inspection results and returning certain 
assemblies to the manufacturer. The FAA is issuing this AD to address 
oxygen leakage from the cylinder and valve assemblies, which could 
result in decreased or insufficient oxygen supply during a 
depressurization event; and heating or flow friction, which could cause 
an ignition event in the valve assembly.

Discussion of Final Airworthiness Directive

Comments

    The FAA received comments from four commenters, including Atlas 
Air, Aviation Partners Boeing, FlyPersia Airlines, and SIA Engineering. 
The following presents the comments received on the NPRM and the FAA's 
response to each comment.

Effect of Winglets on Accomplishment of the Proposed Actions

    Aviation Partners Boeing stated that the installation of winglets 
per Supplemental Type Certificate (STC) ST00830SE, STC ST01219SE, STC 
ST01518SE, and STC ST01920SE does not affect the accomplishment of the 
manufacturer's service instructions.
    The FAA agrees with the commenter that STC ST00830SE, STC 
ST01219SE, STC ST01518SE, and STC ST01920SE do not affect the 
accomplishment of the manufacturer's service instructions. Therefore, 
the installation of STC ST00830SE, STC ST01219SE, STC ST01518SE, and 
STC ST01920SE do not affect the ability to accomplish the actions 
required by this AD. The FAA has not changed this AD in this regard.

[[Page 50012]]

Request To Change the Applicability for Certain Airplanes

    FlyPersia Airlines requested that paragraph (c)(12) of the proposed 
AD be changed to ``The Boeing Company Airplanes.'' The commenter 
asserted that some of the affected oxygen cylinder and valve assemblies 
may be installed on other Boeing airplanes.
    The FAA does not agree with the change requested. The applicability 
of this AD includes the airplane models that are known to be affected. 
However, as stated in paragraph (c) of this AD, the affected oxygen 
cylinder and valve assemblies might be installed on, but are not 
limited to, the aircraft identified in paragraphs (c)(1) through (12) 
of this AD, certificated in any category. This AD has not been changed 
in regard to this request.

Request for Clarification on Compliance of a Specific Airplane

    SIA Engineering requested clarification on whether Boeing Model 
737-8 airplane, Manufacturer Serial Number (MSN) 44257, is in 
compliance with the proposed AD. The commenter declared that the 
airplane was delivered in May of 2022 and was in compliance with AD 
2022-04-09. The commenter also pointed out that the proposed AD 
provided credit for the service information that was required by AD 
2022-04-09 and asked if credit may be taken for airplanes that have 
complied with AD 2022-04-09 and reported the results as required by 
that AD.
    The FAA agrees to clarify. An airplane without a part identified in 
paragraph (c) of this AD is not affected by this AD. However, an 
airplane delivered without an affected part, but on which the part was 
later replaced with an affected part (one identified in paragraph (c) 
of this AD) is affected by this AD and must comply with this AD; this 
includes complying with the revised parts installation prohibition 
specified in paragraph (k) of this AD.

Request To Correct Typographical Error

    Atlas Air and SIA Engineering noted a typographical error in the 
regulatory text of the proposed AD. The commenters pointed out that the 
paragraph designation of the Parts Installation Limitation paragraph 
should have been designated as paragraph (k) of the proposed AD.
    The FAA agrees and has redesignated that paragraph, and subsequent 
paragraphs, accordingly.

Conclusion

    The FAA reviewed the relevant data, considered any comments 
received, and determined that air safety requires adopting this AD as 
proposed. Accordingly, the FAA is issuing this AD to address the unsafe 
condition on these products. Except for minor editorial changes, and 
any other changes described previously, this AD is adopted as proposed 
in the NPRM. None of the changes will increase the economic burden on 
any operator.

Related Service Information Under 1 CFR Part 51

    The FAA reviewed the following service information, which describes 
procedures for an inspection to determine the serial numbers of the 
oxygen cylinder and valve assemblies, and the oxygen valve assemblies, 
a detailed inspection for correct spacing of the gap between the bottom 
of the packing retainer and top of the valve body on the assemblies, 
parts marking, inspection report, and return of parts to the 
manufacturer. These documents are distinct since they apply to 
different assembly part numbers.
     AVOX Systems Inc. Alert Service Bulletin 10015804-35-01, 
Revision 03, dated June 7, 2021.
     AVOX Systems Inc. Alert Service Bulletin 10015804-35-02, 
Revision 03, dated March 11, 2022.
     AVOX Systems Inc. Alert Service Bulletin 10015804-35-03, 
Revision 03, dated June 18, 2021.
    This service information is reasonably available because the 
interested parties have access to it through their normal course of 
business or by the means identified in the ADDRESSES section.

Costs of Compliance

    The FAA estimates that this AD affects 3,034 oxygen cylinder and 
valve assemblies, and oxygen valve assemblies, installed on various 
transport category airplanes of U.S. registry. The FAA estimates the 
following costs to comply with this AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                     Cost per      Cost on U.S.
               Action                         Labor cost            Parts cost        product        operators
----------------------------------------------------------------------------------------------------------------
Serial number inspection...........  1 work-hour x $85 per hour             None             $85        $257,890
                                      = $85.
Reporting..........................  1 work-hour x $85 per hour               $0              85         257,890
                                      = $85.
----------------------------------------------------------------------------------------------------------------

    The FAA estimates the following costs to do any necessary follow-on 
actions that would be required based on the results of the inspection. 
The FAA has no way of determining the number of aircraft that might 
need these actions:

                                               On-Condition Costs
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                                                                                                     Cost per
                   Action                                 Labor cost                Parts cost        product
----------------------------------------------------------------------------------------------------------------
Detailed inspection........................  1 work-hour x $85 per hour = $85...              $0             $85
Replacement................................  1 work-hour x $85 per hour = $85...             * 0              85
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* The FAA has received no definitive data on the parts cost for the on-condition replacements.

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

Paperwork Reduction Act

    A federal agency may not conduct or sponsor, and a person is not 
required to respond to, nor shall a person be subject to a penalty for 
failure to comply with a collection of information subject to the 
requirements of the Paperwork Reduction Act unless that collection of 
information displays a currently valid OMB Control Number. The OMB 
Control Number for this information collection is 2120-0056. Public

[[Page 50013]]

reporting for this collection of information is estimated to take 
approximately 1 hour per response, including the time for reviewing 
instructions, searching existing data sources, gathering and 
maintaining the data needed, and completing and reviewing the 
collection of information. All responses to this collection of 
information are mandatory. Send comments regarding this burden estimate 
or any other aspect of this collection of information, including 
suggestions for reducing this burden to: Information Collection 
Clearance Officer, Federal Aviation Administration, 10101 Hillwood 
Parkway, Fort Worth, TX 76177-1524.

Authority for This Rulemaking

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

Regulatory Findings

    This AD will not have federalism implications under Executive Order 
13132. This AD will not have a substantial direct effect on the States, 
on the relationship between the national government and the States, or 
on the distribution of power and responsibilities among the various 
levels of government.
    For the reasons discussed above, I certify that this AD:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866,
    (2) Will not affect intrastate aviation in Alaska, and
    (3) Will not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

The Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

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) 2022-04-09, Amendment 39-21951 
(87 FR 10958, February 28, 2022); and
0
b. Adding the following new AD:

2023-13-11 AVOX Systems Inc. (formerly Scott Aviation): Amendment 
39-22496; Docket No. FAA-2023-0015; Project Identifier AD-2022-
01281-T.

(a) Effective Date

    This airworthiness directive (AD) is effective September 5, 
2023.

(b) Affected ADs

    This AD replaces AD 2022-04-09, Amendment 39-21951 (87 FR 10958, 
February 28, 2022) (AD 2022-04-09).

(c) Applicability

    This AD applies to AVOX Systems Inc. (formerly Scott Aviation) 
oxygen cylinder and valve assemblies having part number (P/N) 
89794077, 89794015, 891511-14, 806835-01, 807982-01, 808433-01, or 
891311-14; and oxygen valve assemblies (body and gage assemblies) 
having P/N 807206-01. These assemblies might be installed on, but 
not limited to, the aircraft identified in paragraphs (c)(1) through 
(12) of this AD, certificated in any category.
    (1) Airbus SAS Model A300 B2-1A, B2-1C, B2K-3C, B2-203, B4-2C, 
B4-103, and B4-203 airplanes.
    (2) Airbus SAS Model A300 B4-601, B4-603, B4-620, B4-622, B4-
605R, B4-622R, F4-605R, F4-622R, and C4-605R Variant F airplanes.
    (3) Airbus SAS Model A310-203, -204, -221, -222, -304, -322, -
324, and -325 airplanes.
    (4) Airbus SAS Model A318-111, -112, -121, and -122 airplanes.
    (5) Airbus SAS Model A319-111, -112, -113, -114, -115, -131, -
132, -133, and -151N airplanes.
    (6) Airbus SAS Model A320-211, -212, -214, -216, -231, -232, -
233, -251N, -252N, -253N, -271N, -272N, and -273N airplanes.
    (7) Airbus SAS Model A321-111, -112, -131, -211, -212, -213, -
231, -232, -251N, -252N, -253N, -271N, -272N, -251NX, -252NX, -
253NX, -271NX, and -272NX airplanes.
    (8) Airbus SAS Model A330-201, -202, -203, -223, -243, -301, -
302, -303, -321, -322, -323, -341, -342, -343, and -941 airplanes.
    (9) Airbus Model A340-211, -212, -213, -311, -312, -313, -541, 
and -642 airplanes.
    (10) ATR--GIE Avions de Transport R[eacute]gional Model ATR42-
200, -300, -320, and -500 airplanes.
    (11) ATR--GIE Avions de Transport R[eacute]gional Model ATR72-
101, -102, -201, -202, -211, -212, and -212A airplanes.
    (12) The Boeing Company Model 747-8 series airplanes.

(d) Subject

    Air Transport Association (ATA) of America Code 35, Oxygen.

(e) Unsafe Condition

    This AD was prompted by reports of cylinder and valve assemblies 
having oxygen leakage from the valve assembly vent hole, caused by 
the absence of a guide that maintains appropriate spacing between 
certain parts. The FAA is issuing this AD to address oxygen leakage 
from cylinder and valve assemblies. The unsafe condition, if not 
addressed, could result in decreased or insufficient oxygen supply 
during a depressurization event; and heating or flow friction, which 
could cause an ignition event in the valve assembly.

(f) Compliance

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

(g) Definition of Detailed Inspection

    For the purposes of this AD, a detailed inspection is an 
intensive examination of a specific item, installation, or assembly 
to detect damage, failure, or irregularity. Available lighting is 
normally supplemented with a direct source of good lighting at an 
intensity deemed appropriate. Inspection aids such as mirror, 
magnifying lenses, etc., may be necessary. Surface cleaning and 
elaborate procedures may be required.

(h) Identification of Affected Cylinder and Valve Assemblies

    Within 60 days after the effective date of this AD, inspect the 
oxygen valve assemblies, and oxygen cylinder and valve assemblies, 
to determine if the serial numbers of the valve, cylinder, and 
entire assembly, are listed in Appendix 1 or Appendix 2, ``Affected 
Shipments,'' of the applicable service information identified in 
paragraphs (h)(1) through (3) of this AD. A review of airplane 
maintenance records is acceptable in lieu of this inspection if the 
serial numbers can be conclusively determined from that review.
    (1) AVOX Systems Inc. Alert Service Bulletin 10015804-35-01, 
Revision 03, dated June 7, 2021.
    (2) AVOX Systems Inc. Alert Service Bulletin 10015804-35-02, 
Revision 03, dated March 11, 2022.
    (3) AVOX Systems Inc. Alert Service Bulletin 10015804-35-03, 
Revision 03, dated June 18, 2021.

[[Page 50014]]

(i) Inspection of the Gap, Parts Marking Actions, and Replacement, With 
No Changes

    If, during any inspection or records review required by 
paragraph (h) of this AD, any oxygen valve assembly, valve or 
cylinder of an oxygen cylinder and valve assembly, or oxygen 
cylinder and valve assembly having an affected serial number is 
found: Before further flight, do a detailed inspection for correct 
spacing of the gap between the bottom of the packing retainer and 
top of the valve body, in accordance with paragraph 3.C. of the 
Accomplishment Instructions of the applicable service information 
identified in paragraphs (h)(1) through (3) of this AD.
    (1) If the gap is found to be acceptable, as defined in the 
applicable service information identified in paragraphs (h)(1) 
through (3) of this AD, before further flight, do the parts marking 
actions in accordance with paragraph 3.D.(1) of the Accomplishment 
Instructions of the applicable service information identified in 
paragraphs (h)(1) through (3) of this AD.
    (2) If the gap is found to be unacceptable, as defined in the 
applicable service information identified in paragraphs (h)(1) 
through (3) of this AD, before further flight, remove the affected 
assembly, in accordance with paragraphs 3.D.(2) or 3.D.(3), as 
applicable, of the Accomplishment Instructions of the applicable 
service information identified in paragraphs (h)(1) through (3) of 
this AD; and replace with a serviceable assembly.

(j) Reporting and Return of Parts

    (1) Report the results of the inspection required by paragraph 
(i) of this AD within the applicable time specified in paragraph 
(j)(1)(i) or (ii) of this AD. Report the results in accordance with 
paragraph 3.D.(1)(a) of the Accomplishment Instructions of the 
applicable service information identified in paragraphs (h)(1) 
through (3) of this AD.
    (i) If the inspection was done on or after the effective date of 
this AD: Submit the report within 30 days after the inspection.
    (ii) If the inspection was done before the effective date of 
this AD: Submit the report within 30 days after the effective date 
of this AD.
    (2) If, during the inspection required by paragraph (i) of this 
AD, any gap is found to be unacceptable, within the applicable time 
specified in paragraph (j)(2)(i) or (ii) of this AD, return the 
assembly to the manufacturer in accordance with paragraph 3.D.(2) or 
3.D.(3), as applicable, of the Accomplishment Instructions of the 
applicable service information identified in paragraphs (h)(1) 
through (3) of this AD, except you are not required to contact AVOX 
Systems Inc. for shipping instructions.
    (i) If the inspection was done on or after the effective date of 
this AD: Return the assembly within 30 days after the inspection.
    (ii) If the inspection was done before the effective date of 
this AD: Return the assembly within 30 days after the effective date 
of this AD.

(k) Parts Installation Limitation

    As of the effective date of this AD, no AVOX Systems Inc. oxygen 
valve assembly, or valve or cylinder that is part of an oxygen 
cylinder and valve assembly, or oxygen cylinder and valve assembly 
having an affected serial number identified in Appendix 1, 
``Affected Shipments,'' or Appendix 2, ``Affected Shipments,'' of 
any AVOX Systems Inc. service information identified in paragraphs 
(h)(1) through (3) of this AD may be installed on any airplane 
unless the requirements of paragraph (i) of this AD have been 
accomplished on that affected assembly.

(l) Credit for Previous Actions

    (1) This paragraph provides credit for the actions specified in 
paragraphs (h) or (i) of this AD, if those actions were performed 
before the effective date of this AD using the service information 
specified in paragraphs (l)(1)(i) through (iii) of this AD. This 
service information is not incorporated by reference in this AD.
    (i) AVOX Systems Inc. Service Bulletin 10015804-35-01, dated 
March 6, 2019; and AVOX Systems Inc. Alert Service Bulletin 
10015804-35-01, Revision 01, dated July 9, 2019.
    (ii) AVOX Systems Inc. Alert Service Bulletin 10015804-35-02, 
Revision 1, dated September 4, 2019.
    (iii) AVOX Systems Inc. Service Bulletin 10015804-35-03, dated 
April 11, 2019; and AVOX Systems Inc. Alert Service Bulletin 
10015804-35-03, Revision 01, dated May 21, 2019.
    (2) This paragraph provides credit for the actions specified in 
paragraphs (h) or (i) of this AD, if those actions were performed 
before the effective date of this AD using the service information 
specified in paragraphs (l)(2)(i) through (iii) of this AD, which 
was incorporated by reference in AD 2022-04-09.
    (i) AVOX Systems Inc. Alert Service Bulletin 10015804-35-01, 
Revision 02, dated October 16, 2019.
    (ii) AVOX Systems Inc. Alert Service Bulletin 10015804-35-02, 
Revision 2, dated October 31, 2019.
    (iii) AVOX Systems Inc. Alert Service Bulletin 10015804-35-03, 
Revision 02, dated October 15, 2019.

(m) Alternative Methods of Compliance (AMOCs)

    (1) The Manager, East Certification 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 manager of the East Certification Branch, send it to ATTN: 
Program Manager, Continuing Operational Safety, at the address 
identified in paragraph (n) of this AD or email to: [email protected]. If mailing information, also submit information by 
email.
    (2) Before using any approved AMOC, notify your appropriate 
principal inspector, or lacking a principal inspector, the manager 
of the responsible Flight Standards Office.

(n) Related Information

    For more information about this AD, contact Elizabeth Dowling, 
Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, 
Westbury, NY 11590; telephone 516-228-7300; email [email protected].

(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 the AD specifies otherwise.
    (i) AVOX Systems Inc. Alert Service Bulletin 10015804-35-01, 
Revision 03, dated June 7, 2021.
    (ii) AVOX Systems Inc. Alert Service Bulletin 10015804-35-02, 
Revision 03, dated March 11, 2022.
    (iii) AVOX Systems Inc. Alert Service Bulletin 10015804-35-03, 
Revision 03, dated June 18, 2021.
    (3) For service information identified in this AD, contact AVOX 
Systems Inc., 225 Erie Street, Lancaster, NY 14086; telephone 716-
683-5100; website safranaerosystems.com.
    (4) 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.
    (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 7, 2023.
Michael Linegang,
Acting Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2023-16192 Filed 7-31-23; 8:45 am]
BILLING CODE 4910-13-P