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Federal Register / Vol. 86, No. 148 / Thursday, August 5, 2021 / Rules and Regulations DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210131; Project Identifier MCAI202001628T; Amendment 3921658; AD 20211511
RIN 2120AA64

Airworthiness Directives; Airbus SAS
Airplanes Federal Aviation Administration FAA, Department of Transportation DOT.
ACTION: Final rule.
AGENCY:

The FAA is adopting a new airworthiness directive AD for all Airbus SAS Model A330200, 300, 800, and 900 series airplanes; and Model A340200, 300, 500, and 600
series airplanes. This AD was prompted by reports that certain oxygen supply solenoid valves are a potential source of increased flow resistance within the flightcrew oxygen system. This AD
requires a special detailed inspection flow test of certain solenoid valves, and replacement if necessary, 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 September 9, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of September 9, 2021.
ADDRESSES: For material incorporated by reference IBR in this AD, contact EASA, Konrad-Adenauer-Ufer 3, 50668
Cologne, Germany; telephone +49 221
8999 000; email ADs@easa.europa.eu;
internet www.easa.europa.eu. You may find this IBR material on the EASA
website at https ad.easa.europa.eu.
You may view this IBR 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 2062313195.
It is also available in the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0131.

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SUMMARY:

Examining the AD Docket You may examine the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0131; or in person at Docket Operations
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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 W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Vladimir Ulyanov, Aerospace Engineer, Large Aircraft Section, International Validation Branch, FAA, 2200 South 216th St., Des Moines, WA 98198;
telephone and fax 2062313229; email vladimir.ulyanov@faa.gov.
SUPPLEMENTARY INFORMATION:
Background EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD 20200273, dated December 9, 2020 EASA AD
20200273 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for all Airbus SAS
Model A330201, A330202, A330203, A330223, A330243, A330301, A330
302, A330303, A330321, A330322, A330323, A330341, A330342, A330
343, A330743L, A330841, A330941, A340211, A340212, A340213, A340
311, A340312, A340313, A340541, A340542, A340642, and A340643
airplanes. Model A330743L, A340
542, and A340643 airplanes are not certificated by the FAA and are not included on the U.S. type certificate data sheet; this AD therefore does not include those airplanes in the applicability.
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to all Airbus SAS Model A330
200, 300, 800, and 900 series airplanes; and Model A340200, 300, 500, and 600 series airplanes. The NPRM published in the Federal Register on March 8, 2021 86 FR
13239. The NPRM was prompted by reports that certain oxygen supply solenoid valves are a potential source of increased flow resistance within the flightcrew oxygen system. The NPRM
proposed to require a special detailed inspection flow test of certain solenoid valves, and replacement if necessary, as specified in EASA AD 20200273.
The FAA is issuing this AD to address increased flow resistance within the flightcrew oxygen system, which could lead to a reduced flow of oxygen supply to the flightcrew oxygen masks, and in combination with in-flight depressurization, smoke in the flight
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deck, or a smoke evacuation procedure, could lead to flightcrew hypoxia and loss of useful consciousness, resulting in loss of control of the airplane. See the MCAI for additional background information.
Comments The FAA gave the public the opportunity to participate in developing this final rule. The following presents the comments received on the NPRM
and the FAAs response to each comment.
Request To Allow Additional Source of Service Information Delta Air Lines DAL asked that the FAA add a paragraph h3 to the proposed AD which would allow operators to use the serial numbers identified in Safran Service Information Letter SIL SIL120, dated May 20, 2019, instead of the year of manufacture, to determine whether a solenoid valve is an affected part, as defined in EASA AD
20200273. DAL stated that the SIL
contains the serial numbers and year of manufacture of affected solenoid valves.
The FAA agrees to clarify. EASA AD
20200273 does not specify how to determine whether a solenoid valve is an affected part. The FAA agrees that operators can use Safran SIL120 as an additional source of guidance for identification of the affected parts by the serial numbers. The FAA has added Note 1 to paragraph g of this AD
stating that additional guidance for identification of affected parts can be found in Safran Service Information Letter SIL120, dated May 20, 2019.
Request Not To Return Affected Valves to Manufacturer DAL asked that the requirement to send any affected solenoid valves back to Zodiac for repair, in which is specified as Required for Compliance RC in the applicable service information identified in EASA AD
20200273 be excluded in the proposed AD. DAL stated that all affected parts must pass a flow test with no defects found prior to the next flight of the airplane after installation on the airplane.
The FAA agrees with the commenter for the reasons provided. The FAA has revised paragraph i of this AD to exclude the requirement to send any affected solenoid valve back to Zodiac for repair.
Conclusion The FAA reviewed the relevant data, considered the comments received, and determined that air safety and the public interest require adopting this
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