[Federal Register Volume 89, Number 204 (Tuesday, October 22, 2024)]
[Rules and Regulations]
[Pages 84267-84272]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2024-24370]


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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; 
Amendment 39-22857; AD 2024-19-15]
RIN 2120-AA64


Airworthiness Directives; Safran Aerosystems (Formerly AVOX 
Systems Inc.; 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) 2023-13-
11, 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 2023-13-11 required inspecting the oxygen valve 
assemblies, and oxygen cylinder and valve assemblies, to determine the 
serial number of the valve, cylinder, and entire assembly; inspecting 
certain assemblies and parts for correct spacing of the gap between the 
bottom of the packing retainer and top of the valve body on the 
assemblies, and replacing assemblies having unacceptable gaps. AD 2023-
13-11 also limited the installation of affected parts and required 
reporting inspection results and returning certain assemblies to the 
manufacturer. This AD was prompted by the determination that additional 
assemblies and parts are subject to the unsafe condition. This AD 
requires the actions specified in AD 2023-13-11 and expands the list of 
affected assemblies and parts. The FAA is issuing this AD to address 
the unsafe condition on these products.

DATES: This AD is effective November 26, 2024.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of November 26, 
2024.
    The Director of the Federal Register approved the incorporation by 
reference of certain other publications listed in this AD as of 
September 5, 2023 (88 FR 50011, August 1, 2023).

ADDRESSES: 
    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 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:
    <bullet> For AVOX and Safran Aerosystems material identified in 
this AD, contact AVOX Systems Inc., 225 Erie Street, Lancaster, NY 
14086; telephone 716-683-5100; website safranaerosystems.com.
    <bullet> 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. It is also available at regulations.gov under 
Docket No. FAA-2024-0759.

FOR FURTHER INFORMATION CONTACT: Gabriel Kim, Aviation Safety Engineer, 
FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-
228-7300; email <a href="/cdn-cgi/l/email-protection#7d44501c0b0e5013041c1e12501e120e3d1b1c1c531a120b"><span class="__cf_email__" data-cfemail="10293d7166633d7e6971737f3d737f63507671713e777f66">[email protected]</span></a>.

SUPPLEMENTARY INFORMATION: 

Background

    The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 
CFR part 39 to supersede AD 2023-13-11, Amendment 39-22496 (88 FR 
50011, August 1, 2023) (AD 2023-13-11). AD 2023-13-11 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 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).
    The NPRM published in the Federal Register on March 25, 2024 (89 FR 
20558). The NPRM was prompted by a report that the manufacturer 
identified additional assemblies and parts subject to the unsafe 
condition. In the NPRM, the FAA proposed to continue to require the 
actions specified in AD 2023-13-11 and require similar actions for 
those additional assemblies and parts. 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 Alaska 
Airlines (Alaska), American Airlines, Cathay Pacific Airways, Delta Air 
Lines (Delta), and SIAEC (SIA Engineering Company). The following 
presents the comments received on the NPRM and the FAA's response to 
each comment.

Request To Reference Later Revisions of Material Identified as Credit

    Alaska requested adding the required revisions of the material 
(identified in paragraphs (l)(1) through (3) of the proposed AD) to the 
group of material identified as acceptable material in paragraph (p)(3) 
of the proposed AD for actions accomplished before the effective date 
of this AD.
    The FAA disagrees with the request to revise paragraph (p)(3) of 
this AD. A global alternative method of compliance (AMOC) letter, 753-
23-00200, was issued for AD 2023-13-11 that identified the required 
material in paragraphs (l)(1) through (3) of this AD as an acceptable 
AMOC. Accomplishment of the required material before the effective date 
of this AD to comply with the requirements of this AD is addressed by 
paragraph (f) of this AD. Paragraph (f) of this AD allows for the use 
of the required material before the effective date of this AD. No 
change to the AD has been made in this regard.

Request for Clarification on Acceptable Material for Credit Conclusion

    SIAEC asked if credit can be granted for the actions specified in 
paragraphs (h) and (i) of the proposed AD if Revision 03 of the 
material was used.
    The FAA agrees to clarify. Paragraphs (h) and (i) of this AD still 
reference Revision 03 of the material as the primary means of 
compliance for those

[[Page 84268]]

parts identified in Appendices 1 or 2 of the referenced material. 
Paragraph (p) of this AD references the other revision levels that are 
acceptable for credit if they were used before certain effective dates. 
Paragraph (f) of this AD allows for the use of the required material 
before the effective date of this AD. No change to this AD is necessary 
in this regard.

Request To Require Actions for All Serial Numbers Instead of List of 
Affected Serial Numbers

    American Airlines requested revising the applicability of the 
proposed AD to apply to all serial numbers of the affected part 
numbers, instead of adding groups of additional serial numbers in 
superseding ADs. Alaska requested revising the requirements for the 
serial number inspection, in particular, the ones in Appendix 3 of the 
required material referenced in paragraph (l) of the proposed AD. 
Alaska explained that the reading and recording of the serial numbers 
in three different places on the bottle leads to numerous discrepancies 
by personnel, which then leads to additional time spent trying to 
review all the numbers and identify the affected airplanes, possibly 
leading to affected bottles remaining on the airplane longer before 
being removed. Alaska suggested that a check for the manufacturer date, 
and then if a bottle has an affected manufacture date, an inspection to 
determine if the valve has a blue dot, would be sufficient to determine 
if an affected bottle is installed on the airplane. Alaska also 
suggested that once an affected bottle is found, the operator could 
then choose to accomplish the gap check and record the required serial 
numbers, or assume all affected bottles are suspect, and then send any 
suspected bottle back to the vendor instead of doing a gap check and 
subsequent serial number record-keeping.
    The FAA does not agree to expand the applicability. Revising the 
applicability to refer to the date of manufacture instead of the serial 
numbers that must be inspected would increase the burden on some 
operators. However, operators choosing to inspect all the serial 
numbers of a part number may apply for an AMOC using the procedures 
specified in paragraph (q) of this AD. No changes to this AD have been 
made in this regard.

Request for Additional Compliance Time for Replacing Affected Parts

    Alaska requested a revision to extend the compliance time to at 
least 90 days due to the large increase in number of affected bottles 
and potential effect on the limited supply of spare bottles. Alaska 
reasoned that a compliance time of 90 days would help repair vendors 
turn around the repair of faulty bottles in a timely manner. Although 
Alaska did not specify what action or paragraph the referenced 
compliance time would be for, the FAA infers that Alaska is referencing 
the replacement compliance time specified in paragraph (m)(2) of the 
proposed AD.
    The FAA disagrees with the request. A global AMOC letter, 753-23-
00200, was provided in December 2023 to provide relief for using later 
revisions of the material referenced in AD 2023-13-11, so knowledge of 
the additional numbers of affected bottles identified in the later 
revisions of the material would have been available since December 
2023. In addition, the compliance time for most of the bottles affected 
by AD 2023-13-11 would have elapsed in early November 2023. Replacement 
before further flight ensures that airplanes are not knowingly flying 
with an unsafe condition. Operators may also apply for an AMOC under 
the provisions of paragraph (q) of this AD. The FAA has not changed the 
AD in this regard.

Request To Remove Inspection Report Requirement

    Delta requested that the inspection report that was specified in 
paragraphs (j)(1) and (n)(1) of the proposed AD be removed. Delta 
pointed to guidance in the AD Manual (FAA-IR-M-8040.1C) (https://drs.faa.gov/browse/excelExternalWindow/66DDD8E1D2E95DB3862577270062AABD.0001) that describes the general 
conditions for requiring inspection reports, and contrasted that with 
the material's description of the problem with the affected valve 
assemblies and the proposed AD's proposed requirements as the rationale 
for removing the inspection report.
    The FAA agrees to remove the inspection report that was proposed in 
paragraphs (j)(1) and (n)(1) of the proposed AD for the reasons 
provided by the commenter. The subsequent paragraph identifiers have 
been revised, and the cost estimate has been updated accordingly.

Request To Address Discrepancy in Serial Numbers in Appendix of 
Material

    SIAEC stated that there is a discrepancy within the tables of 
Appendix 3 of Safran Aerosystems Alert Service Bulletin 10015804-35-01, 
Revision 04, dated November 9, 2023. SIAEC noted that some of the 
affected valve serial numbers are erroneously listed in the affected 
``Cylinder Serial #'' columns in the tables for the Cylinder and Valve 
assemblies P/Ns 89794077 and 891511-14.
    The FAA agrees there are discrepancies in the serial number lists. 
Paragraph (l)(1) of this AD has been revised to correct the 
discrepancies.

Request for Clarification of Credit

    Cathay Pacific Airways noted that the expanded serial number list 
from the latest revision of the Safran/AVOX service bulletins has a 
manufacturing date range from 2011 to 2017. The commenter asked whether 
the actions specified in the latest Safran/AVOX service bulletin must 
be redone on an affected serial number if maintenance can show that the 
part has been overhauled already.
    The FAA contacted Safran for additional information regarding the 
comment, and provides the following clarification. The ``overhaul kit'' 
does not always have the necessary parts and therefore does not meet 
the intent of this AD. P/N 10015804 is a guide part number. If this 
part is missing, the gap check will fail. However, if the tank 
undergoes an overhaul as outlined in the Component Maintenance Manual 
(specified in paragraph 1.K of the applicable service bulletin), it 
will be equipped with the necessary guide, reassembled, and tested for 
leaks and hydrostatic pressure. This process aligns with the intent of 
this AD.

Additional Changes to This Final Rule

    The FAA corrected the name of the publisher of the material 
identified in paragraphs (l)(1) through (3) of this AD from AVOX 
Systems Inc. to Safran Aerosystems. The FAA has also revised references 
to the manufacturer's name specified throughout this final rule to 
identify the manufacturer name as published in the most recent material 
for the affected models.

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.

Material Incorporated by Reference Under 1 CFR Part 51

    The FAA reviewed the following material. This material specifies 
procedures for an inspection to

[[Page 84269]]

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.
    <bullet> Safran Aerosystems Alert Service Bulletin 10015804-35-01, 
Revision 04, dated November 9, 2023.
    <bullet> Safran Aerosystems Alert Service Bulletin 10015804-35-02, 
Revision 06, dated August 30, 2023.
    <bullet> Safran Aerosystems Alert Service Bulletin 10015804-35-03, 
Revision 05, dated September 29, 2023.
    This AD also requires the following material, which the Director of 
the Federal Register approved for incorporation by reference as of 
September 5, 2023 (88 FR 50011, August 1, 2023).
    <bullet> AVOX Systems Inc. Alert Service Bulletin 10015804-35-01, 
Revision 03, dated June 7, 2021.
    <bullet> AVOX Systems Inc. Alert Service Bulletin 10015804-35-02, 
Revision 03, dated March 11, 2022.
    <bullet> AVOX Systems Inc. Alert Service Bulletin 10015804-35-03, 
Revision 03, dated June 18, 2021.
    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.

Costs of Compliance

    The FAA estimates that this AD affects 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 AD:

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

    The FAA estimates the following costs to do any necessary 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
----------------------------------------------------------------------------------------------------------------
                                                                                                     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 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

    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) 2013-13-11, Amendment 39-22496 
(88 FR 50011, August 1, 2023); and

[[Page 84270]]

0
b. Adding the following new AD:

2024-19-15 Safran Aerosystems (formerly AVOX Systems Inc.; Scott 
Aviation): Amendment 39-22857; Docket No. FAA-2024-0759; Project 
Identifier AD-2023-01040-T.

(a) Effective Date

    This airworthiness directive (AD) is effective November 26, 
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 Safran Aerosytems (formerly AVOX Systems 
Inc.; 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.
    (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 Updated Language

    This paragraph restates the requirements of paragraph (h) of AD 
2023-13-11, with updated language. 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 material 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 Updated Language

    This paragraph restates the requirements of paragraph (i) of AD 
2023-13-11, with updated language. 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 
material identified in paragraphs (h)(1) through (3) of this AD.
    (1) If the gap is found to be acceptable, as defined in the 
applicable material 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 material identified in paragraphs (h)(1) through 
(3) of this AD.
    (2) If the gap is found to be unacceptable, as defined in the 
material 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 material identified in 
paragraphs (h)(1) through (3) of this AD; and replace with a 
serviceable assembly.

(j) Retained Return of Parts, With Updated Language

    This paragraph restates the requirement to return parts, as 
specified in paragraph (j)(2) of AD 2023-13-11, with updated 
language. 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)(1) or (2) 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 material identified in paragraphs (h)(1) through (3) of 
this AD, except you are not required to contact AVOX Systems Inc. 
for shipping instructions.
    (1) 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.
    (2) 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 Updated Language

    This paragraph restates the provisions of paragraph (k) of AD 
2023-13-11, with updated language. 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. material 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 material identified in paragraphs

[[Page 84271]]

(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) Safran Aerosystem Alert Service Bulletin 10015804-35-01, 
Revision 04, dated November 9, 2023, except as specified in 
paragraphs (l)(1)(i) and (ii).
    (i) In rows 2 through 492 of table tab ``89794077'' in Appendix 
3 of Safran Aerosystems Alert Service Bulletin 10015804-35-01, 
Revision 04, dated November 9, 2023, the list of numbers in the 
``Valve Serial #'' and ``Cylinder Serial #'' columns have been 
transposed with each other and the list of numbers in the ``Valve 
Part #'' and ``Cylinder Part #'' columns have also been transposed 
with each other.
    (ii) In rows 2 through 65 of table tab 891511-14 in Appendix 3 
of Safran Aerosystems Alert Service Bulletin 10015804-35-01, 
Revision 04, dated November 9, 2023, the list of numbers in the 
``Valve Serial #'' and ``Cylinder Serial #'' columns have been 
transposed with each other, and the list of numbers in the ``Valve 
Part #'' and ``Cylinder Part #'' columns have been transposed with 
each other.
    (2) Safran Aerosystems Alert Service Bulletin 10015804-35-02, 
Revision 06, dated August 30, 2023.
    (3) Safran Aerosystems 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 material identified in 
paragraphs (l)(1) through (3) of this AD.
    (1) If the gap is found to be acceptable, as defined in the 
applicable material 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 material identified in paragraphs (l)(1) through 
(3) of this AD.
    (2) If the gap is found to be unacceptable, as defined in the 
material 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 material identified in 
paragraphs (l)(1) through (3) of this AD; and replace with a 
serviceable assembly.

(n) New Return of Additional Parts

    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)(1) or (2) 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 
material identified in paragraphs (l)(1) through (3) of this AD, 
except you are not required to contact Safran Aerosystems for 
shipping instructions.
    (1) If the inspection was done on or after the effective date of 
this AD: Return the assembly within 30 days after the inspection.
    (2) 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. or 
Safran Aerosystems 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 Safran Aerosystems Inc. 
material 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 material specified in paragraphs (p)(1)(i) through (iii) 
of this AD. This material 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 material 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 material 
specified in paragraphs (p)(3)(i) through (ii) of this AD. This 
material 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: <a href="/cdn-cgi/l/email-protection#26676b69656640474708414950"><span class="__cf_email__" data-cfemail="cd8c80828e8dabacace3aaa2bb">[email protected]</span></a>.
    (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 516-228-7300; email <a href="/cdn-cgi/l/email-protection#7c45511d0a0f5112051d1f13511f130f3c1a1d1d521b130a"><span class="__cf_email__" data-cfemail="87beaae6f1f4aae9fee6e4e8aae4e8f4c7e1e6e6a9e0e8f1">[email protected]</span></a>.
    (2) Material 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 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 this AD specifies otherwise.
    (3) The following material was approved for IBR on November 26, 
2024.
    (i) Safran Aerosystems Alert Service Bulletin 10015804-35-01, 
Revision 04, dated November 9, 2023.
    (ii) Safran Aerosystems Alert Service Bulletin 10015804-35-02, 
Revision 06, dated August 30, 2023.
    (iii) Safran Aerosystems Alert Service Bulletin 10015804-35-03, 
Revision 05, dated September 29, 2023.
    (4) The following material was approved for IBR on September 5, 
2023 (88 FR 50011, 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 material identified in this AD, contact AVOX Systems 
Inc., 225 Erie Street,

[[Page 84272]]

Lancaster, NY 14086; telephone 716-683-5100; website 
safranaerosystems.com.
    (6) 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.
    (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 <a href="/cdn-cgi/l/email-protection#2046520e494e5350454354494f4e604e4152410e474f56"><span class="__cf_email__" data-cfemail="1274603c7b7c61627771667b7d7c527c7360733c757d64">[email protected]</span></a>.

    Issued on September 23, 2024.
Victor Wicklund,
Deputy Director, Compliance & Airworthiness Division, Aircraft 
Certification Service.
[FR Doc. 2024-24370 Filed 10-21-24; 8:45 am]
BILLING CODE 4910-13-P


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