[Federal Register Volume 89, Number 58 (Monday, March 25, 2024)]
[Proposed Rules]
[Pages 20558-20562]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2024-06032]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2024-0759; Project Identifier AD-2023-01040-T]
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: Notice of proposed rulemaking (NPRM).

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SUMMARY: The FAA proposes to supersede Airworthiness Directive (AD) 
2023-13-11, which applies 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 2023-13-11 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; and 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. AD 2023-13-11 also limits the installation of 
affected parts under certain conditions and requires reporting 
inspection results and returning certain assemblies to the 
manufacturer. Since the FAA issued AD 2023-13-11, the manufacturer 
identified additional assemblies and parts subject to the unsafe 
condition. This proposed AD would continue to require the actions 
specified in AD 2023-13-11 and require similar actions for those 
additional assemblies and parts. 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 May 9, 
2024.

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-2024-0759; 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, 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 
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.

FOR FURTHER INFORMATION CONTACT: Gabriel Kim, Aviation Safety Engineer, 
FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-
228-7343; 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-2024-0759; Project Identifier 
AD-2023-01040-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 
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 proposed AD.

Confidential Business Information

    CBI is commercial or financial information that is both customarily 
and

[[Page 20559]]

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 
Gabriel Kim, Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 
410, Westbury, NY 11590; telephone 516-228-7343; email [email protected]. Any commentary that the FAA receives that is not 
specifically designated as CBI will be placed in the public docket for 
this rulemaking.

Background

    The FAA issued AD 2023-13-11, Amendment 39-22496 (88 FR 50011, 
August 1, 2023) (AD 2023-13-11), for 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 2023-13-11 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, and by a determination that additional 
assemblies and parts are affected by the unsafe condition addressed by 
AD 2022-04-09, Amendment 39-21951 (87 FR 10958, February 28, 2022) (AD 
2022-04-09) (which was superseded by AD 2023-13-11). AD 2023-13-11 
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 assemblies and parts with 
certain serial numbers, AD 2023-13-11 also requires 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. AD 2023-13-11 also 
limits the installation of affected parts under certain conditions and 
requires reporting inspection results and returning certain assemblies 
to the manufacturer. The agency issued AD 2023-13-11 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.

Actions Since AD 2023-13-11 Was Issued

    Since the FAA issued AD 2023-13-11, the manufacturer identified 
additional assemblies and parts, including a new part number 89794050 
for oxygen cylinder and valve assemblies, that are subject to the 
unsafe condition. New service information has been issued that expands 
the population of discrepant parts, providing more serial numbers for 
which to inspect.

FAA's Determination

    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.

Related Service Information Under 1 CFR Part 51

    The FAA reviewed the following service information. This service 
information specifies 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 04, dated November 9, 2023.
     AVOX Systems Inc. Alert Service Bulletin 10015804-35-02, 
Revision 06, dated August 30, 2023.
     AVOX Systems Inc. Alert Service Bulletin 10015804-35-03, 
Revision 05, dated September 29, 2023.
    This AD also requires the following service information, which the 
Director of the Federal Register approved for incorporation by 
reference as of September 5, 2023 (88 FR 50011, August 1, 2023).
     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.

Proposed AD Requirements in This NPRM

    This proposed AD would retain all of the requirements of AD 2023-
13-11. This proposed AD would apply to additional assemblies and parts, 
including a new part number, 89794050, for oxygen cylinder and valve 
assemblies. This proposed AD would require accomplishing the actions 
specified in the service information described previously. This 
proposed AD would also limit the installation of affected parts under 
certain conditions and require returning the affected parts and sending 
the inspection results to the manufacturer.

Costs of Compliance

    The FAA estimates that this AD, if adopted as proposed, would 
affect 3,777 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 
proposed AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                         Parts       Cost per      Cost on U.S.
                 Action                            Labor cost             cost        product        operators
----------------------------------------------------------------------------------------------------------------
Serial number inspection (retained        1 work-hour x $85 per hour        None             $85       $321, 045
 action from AD 2023[dash]13[dash]11).     = $85.
Reporting (retained action from AD 2023-  1 work-hour x $85 per hour          $0              85         321,045
 13-11).                                   = $85.
----------------------------------------------------------------------------------------------------------------


[[Page 20560]]

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

                                               On-Condition Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                     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             (*)              85
Return of parts...............................  1 work-hour x $85 per hour = $85           ** 50             135
----------------------------------------------------------------------------------------------------------------
* The FAA has received no definitive data on the parts cost for the on-condition replacement.
** The FAA has received no definitive data to provide cost estimates for the on-condition return of parts,
  except the FAA estimates that it would take about 1 work-hour per product to comply with the associated
  paperwork necessary for the return of parts and cost approximately $50 to ship.

    The FAA has included all known costs in its cost estimate. 
According to the manufacturer, however, some or all of the costs of 
this proposed 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 
reporting for this collection of information is estimated to be 
approximately 1 hour per response, including the time for reviewing 
instructions, searching existing data sources, gathering and 
maintaining the data needed, 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

    The FAA has 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 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) 2023-13-11, Amendment 39-22496 
(88 FR 50011, August 1, 2023), and
0
b. Adding the following new AD:

AVOX Systems Inc. (formerly Scott Aviation): Docket No. FAA-2024-
0759; Project Identifier AD-2023-01040-T

(a) Comments Due Date

    The FAA must receive comments on this airworthiness directive 
(AD) by May 9, 2024.

(b) Affected ADs

    This AD replaces AD 2023-13-11, Amendment 39-22496 (88 FR 50011, 
August 1, 2023) (AD 2023-13-11).

(c) Applicability

    This AD applies to AVOX Systems Inc. (formerly Scott Aviation) 
oxygen cylinder and valve assemblies having part number (P/N) 
89794050, 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.

[[Page 20561]]

    (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, and by the manufacturer identifying additional 
assemblies and parts affected by the unsafe condition. 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) Retained Definition of Detailed Inspection, With No Changes

    This paragraph restates the requirements of paragraph (g) of AD 
2023-13-11, with no changes. 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) Retained Identification of Affected Cylinder and Valve Assemblies, 
With No Changes

    This paragraph restates the requirements of paragraph (h) of AD 
2023-13-11, with no changes. Within 60 days after September 5, 2023 
(the effective date of AD 2023-13-11), 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.

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

    This paragraph restates the requirements of paragraph (i) of AD 
2023-13-11, 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) Retained Reporting and Return of Parts, With No Changes

    This paragraph restates the requirements of paragraph (j) of AD 
2023-13-11, with no changes.
    (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 September 5, 2023 
(the effective date of AD 2023-13-11): Submit the report within 30 
days after the inspection.
    (ii) If the inspection was done before September 5, 2023 (the 
effective date of AD 2023-13-11): Submit the report within 30 days 
after September 5, 2023.
    (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 September 5, 2023 
(the effective date of AD 2023-13-11): Return the assembly within 30 
days after the inspection.
    (ii) If the inspection was done before September 5, 2023 (the 
effective date of AD 2023-13-11): Return the assembly within 30 days 
after September 5, 2023.

(k) Retained Parts Installation Limitation, With No Changes

    This paragraph restates the requirements of paragraph (k) of AD 
2023-13-11, with no changes. As of September 5, 2023 (the effective 
date of AD 2023-13-11), 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) New Identification of Additional 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 3, ``Affected Shipments,'' 
of the applicable service information identified in paragraphs 
(l)(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 04, dated November 9, 2023.
    (2) AVOX Systems Inc. Alert Service Bulletin 10015804-35-02, 
Revision 06, dated August 30, 2023.
    (3) AVOX Systems Inc. Alert Service Bulletin 10015804-35-03, 
Revision 05, dated September 29, 2023.

(m) New Inspection of the Gap, Parts Marking Actions, and Replacement 
for Additional Parts

    If, during any inspection or records review required by 
paragraph (l) 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 (l)(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 (l)(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 (l)(1) through (3) of this AD.

[[Page 20562]]

    (2) If the gap is found to be unacceptable, as defined in the 
applicable service information identified in paragraphs (l)(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 (l)(1) through (3) of 
this AD; and replace with a serviceable assembly.

(n) New Reporting and Return of Additional Parts

    (1) Report the results of the inspection required by paragraph 
(m) of this AD within the applicable time specified in paragraph 
(n)(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 (l)(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 (m) of this 
AD, any gap is found to be unacceptable, within the applicable time 
specified in paragraph (n)(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 (l)(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.

(o) New 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 3, 
``Affected Shipments,'' of any AVOX Systems Inc. service information 
identified in paragraphs (l)(1) through (3) of this AD may be 
installed on any airplane unless the requirements of paragraph (m) 
of this AD have been accomplished on that affected assembly.

(p) 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 September 5, 2023 (the effective date of AD 2023-13-11), 
using the service information specified in paragraphs (p)(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 September 5, 2023 (the effective date of AD 2023-13-11), 
using the service information specified in paragraphs (p)(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.
    (3) This paragraph provides credit for the actions specified in 
paragraphs (h), (i), (l), or (m) of this AD, if those actions were 
performed before the effective date of this AD, using the service 
information specified in paragraphs (p)(3)(i) through (ii) of this 
AD. This service information is not incorporated by reference in 
this AD.
    (i) AVOX Systems Inc. Alert Service Bulletin 10015804-35-02, 
Revision 04, dated June 30, 2023; or Revision 05, dated August 14, 
2023.
    (ii) AVOX Systems Inc. Alert Service Bulletin 10015804-35-03, 
Revision 04, dated June 12, 2023.

(q) 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 (r) of this AD or email to: [email protected].
    (2) Before using any approved AMOC, notify your appropriate 
principal inspector, or lacking a principal inspector, the manager 
of the responsible Flight Standards Office.
    (3) AMOCs approved for AD 2023-13-11 are approved as AMOCs for 
the corresponding provisions of this AD.

(r) Related Information

    (1) For more information about this AD, contact Gabriel Kim, 
Aviation Safety Engineer, FAA, 1600 Stewart Avenue, Suite 410, 
Westbury, NY 11590; telephone 516-228-7343; email [email protected].
    (2) Service information identified in this AD that is not 
incorporated by reference is available at the address specified in 
paragraph (s)(5) of this AD.

(s) 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) AVOX Systems Inc. Alert Service Bulletin 10015804-35-01, 
Revision 04, dated November 9, 2023.
    (ii) AVOX Systems Inc. Alert Service Bulletin 10015804-35-02, 
Revision 06, dated August 30, 2023.
    (iii) AVOX Systems Inc. Alert Service Bulletin 10015804-35-03, 
Revision 05, dated September 29, 2023.
    (4) The following service information was approved for IBR on 
September 5, 2023 (88 FR 50013, August 1, 2023).
    (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.
    (5) For service information identified in this AD, contact AVOX 
Systems Inc., 225 Erie Street, Lancaster, NY 14086; telephone 716-
683-5100; website safranaerosystems.com.
    (6) 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.
    (7) 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 [email protected].

    Issued on March 18, 2024.
Victor Wicklund,
Deputy Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2024-06032 Filed 3-22-24; 8:45 am]
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