Federal Register / Vol. 89, No. 204 / Tuesday, October 22, 2024 / Rules and Regulations 84267 

ibr-locations.html or email fr.inspection@

nara.gov. 

Issued on September 13, 2024. 

Peter A. White, 

Deputy Director, Integrated Certificate 

Management Division, Aircraft Certification 

Service. 

[FR Doc. 2024–24369 Filed 10–21–24; 8:45 am] 

BILLING CODE 4910–13–P 

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. 

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: 

• 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. 

• 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 9-avs-nyaco-cos@

faa.gov. 

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 


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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 recordkeeping. 

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/excel

ExternalWindow/66DDD8E1D2E

95DB3862577270062AABD.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 


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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. 

• Safran Aerosystems Alert Service 

Bulletin 10015804–35–01, Revision 04, 

dated November 9, 2023. 

• Safran Aerosystems Alert Service 

Bulletin 10015804–35–02, Revision 06, 

dated August 30, 2023. 

• 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). 

• 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 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

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Serial number inspection (retained action from 

AD 2023-13-11).

1 work-hour × $85 per hour = $85 ................. None ............ $85 $321,045 

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

Action Labor cost Parts cost Cost per 

product 

Detailed inspection ....................................................... 1 work-hour × $85 per hour = $85 ............................... $0 $85 

Replacement ................................................................. 1 work-hour × $85 per hour = $85 ............................... * 85 

Return of parts .............................................................. 1 work-hour × $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 

■ 1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by: 

■ a. Removing Airworthiness Directive 

(AD) 2013–13–11, Amendment 39– 

22496 (88 FR 50011, August 1, 2023); 

and 


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■ 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 

Re ́gional Model ATR42–200, –300, –320, and 

–500 airplanes. 

(11) ATR–GIE Avions de Transport 

Re ́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 


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(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: AMOC@faa.gov. 

(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 9-avs-nyaco-cos@faa.gov. 

(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, 


ddrumheller on DSK120RN23PROD with RULES1
84272 Federal Register / Vol. 89, No. 204 / Tuesday, October 22, 2024 / Rules and Regulations 

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 fr.inspection@nara.gov. 

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 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2024–1691; Project 

Identifier MCAI–2023–01269–E; Amendment 

39–22847; AD 2024–19–05] 

RIN 2120–AA64 

Airworthiness Directives; Safran 

Helicopter Engines, S.A. (Type 

Certificate Previously Held by 

Turbomeca, S.A.) Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for all 

Safran Helicopter Engines, S.A. (Safran) 

(type certificate previously held by 

Turbomeca, S.A.) Model Makila 1A, 

Makila 1A1, and Makila 1A2 engines. 

This AD is prompted by a determination 

that the accumulated service life of 

certain critical parts was 

underestimated. This AD requires 

determining the recalculated service life 

of certain critical parts, replacing if 

necessary, and also specifies conditions 

for installing the parts, as specified in a 

European Union Aviation Safety Agency 

(EASA) AD, which is incorporated by 

reference. 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 a certain publication listed in this AD 

as of November 26, 2024. 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No.FAA–2024–1691; 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, the mandatory 

continuing airworthiness information 

(MCAI), 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 EASA material identified in this 

AD, contact EASA, Konrad-AdenauerUfer 3, 50668 Cologne, Germany; phone: 

+49 221 8999 000; email: ADs@

easa.europa.eu; website: 

ad.easa.europa.eu. It is also available at 

regulations.gov under Docket No. FAA– 

2024–1691. 

• You may view this material at the 

FAA, Airworthiness Products Section, 

Operational Safety Branch, 1200 District 

Avenue, Burlington, MA 01803. For 

information on the availability of this 

material at the FAA, call (817) 222– 

5110. It is also available at 

regulations.gov under Docket No. FAA– 

2024–1691. 

FOR FURTHER INFORMATION CONTACT: 

David Bergeron, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 11590; phone: 

(860) 386–1805; email: 

David.J.Bergeron@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 by adding an AD that would 

apply to all Safran Model Makila 1A, 

Makila 1A1, and Makila 1A2 engines. 

The NPRM published in the Federal 

Register on June 20, 2024 (89 FR 51858). 

The NPRM was prompted by EASA AD 

2023–0218, dated December 19, 2023 

(EASA AD 2023–0218) (also referred to 

as the MCAI), issued by EASA, which 

is the Technical Agent for the Member 

States of the European Union. The 

MCAI states that it has been determined 

that the accumulated service life of 

certain critical parts was 

underestimated. To address this 

potential unsafe condition, the 

manufacturer published service 

information that identifies the affected 

parts and provides instructions for 

recalculating the service life and 

replacing the affected parts. The MCAI 

specifies determining the recalculated 

service life of the affected parts and 

replacing if necessary. The MCAI also 

specifies conditions for installing the 

affected parts. This unsafe condition, if 

not addressed, could lead to operation 

of the affected parts beyond the part life, 

which could cause the failure of affected 

parts, possibly resulting in uncontained 

debris release with consequent damage 

to the helicopter and reduced control of 

the helicopter. 

In the NPRM, the FAA proposed to 

require determining the recalculated 

service life of certain critical parts, 

replacing the parts if necessary, and 

specified conditions for installing the 

parts. The FAA is issuing this AD to 

address the unsafe condition on these 

products. 

You may examine the MCAI in the 

AD docket at regulations.gov under 

Docket No. FAA–2024–1691. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received no comments on 

the NPRM or on the determination of 

the costs. 

Conclusion 

These products have been approved 

by the aviation authority of another 

country and are approved for operation 

in the United States. Pursuant to the 

FAA’s bilateral agreement with this 

State of Design Authority, it has notified 

the FAA of the unsafe condition 

described in the MCAI referenced 

above. The FAA reviewed the relevant 

data 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, this AD is adopted as proposed 

in the NPRM. 

Material Incorporated by Reference 

Under 1 CFR Part 51 

The FAA reviewed EASA AD 2023– 

0218, which specifies determining the 

recalculated service life of affected parts 

and replacing the affected parts, if 

necessary. EASA AD 2023–0218 also 

specifies conditions for installing the 

affected parts. 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 0 engines installed on helicopters 

of U.S. registry. 

The FAA estimates the following 

costs to comply with this AD: 


ddrumheller on DSK120RN23PROD with RULES1