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Rules and Regulations
Federal Register Vol. 86, No. 110
Thursday, June 10, 2021

This section of the FEDERAL REGISTER
contains regulatory documents having general applicability and legal effect, most of which are keyed to and codified in the Code of Federal Regulations, which is published under 50 titles pursuant to 44 U.S.C. 1510.
The Code of Federal Regulations is sold by the Superintendent of Documents.

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210458; Project Identifier MCAI202100595T; Amendment 3921602; AD 20211215
RIN 2120AA64

Airworthiness Directives; Airbus SAS
Airplanes Federal Aviation Administration FAA, DOT.
ACTION: Final rule; request for comments.
AGENCY:

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Examining the AD Docket
The FAA is adopting a new airworthiness directive AD for all Airbus SAS Model A330243, A330
243F, A330341, A330342, and A330
343 airplanes. This AD was prompted by a report of an in-flight turnback due to loss of green and blue hydraulic systems in cruise. This AD requires inspecting for discrepancies of the hydraulic pressure switch harnesses of affected engines, and applicable corrective actions, 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 becomes effective June 25, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of June 25, 2021.
The FAA must receive comments on this AD by July 26, 2021.
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 https www.regulations.gov. Follow the instructions for submitting comments.
Fax: 2024932251.
Mail: U.S. Department of Transportation, Docket Operations, SUMMARY:

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M30, West Building Ground Floor, Room W12140, 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.
For material incorporated by reference IBR in this AD, contact EASA, KonradAdenauer-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 at https www.regulations.gov by searching for and locating Docket No.
FAA20210458.
You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210458; 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 AD, any comments received, and other information. The street address for Docket Operations is listed above.
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 20210128, dated May 17, 2021 EASA AD 2021
0128 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for all Airbus SAS Model A330243, A330243F, A330341, A330342, and A330343 airplanes.
This AD was prompted by a report of a Model A330 airplane equipped with Rolls-Royce Trent 700 engines that experienced an in-flight turnback due to loss of green and blue hydraulic systems
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in cruise. On the green hydraulic system, electronic centralized aircraft monitoring ECAM warnings HYD G
ENG 2 PUMP LO PR and G SYS LO PR
were triggered, resulting in loss of the green hydraulic system. On the blue hydraulic system, ECAM warning HYD
B ENG 1 PUMP LO PR was triggered, and the flightcrew selected the blue hydraulic system engine-driven pump EDP OFF, per flightcrew operating manual procedures. Subsequent inspections of engine 1 revealed that during a previous maintenance shop visit, and following partial re-routing of hydraulic harnesses, the blue and green EDP pressure switch electrical connectors 4001JG2A and 4001JG1A
were inadvertently cross connected. As a result, the blue hydraulic system was declared faulty ECAM message in flight, when actually the green hydraulic system had failed with low pressure. The FAA is issuing this AD to address the potential loss of two hydraulic systems blue and green in flight, instead of only one green, which could lead to loss of all hydraulic circuits, possibly resulting in loss of control of the airplane. See the MCAI for additional background information.
Related Service Information Under 1
CFR Part 51
EASA AD 20210128 specifies procedures for a general visual inspection for discrepancies including incorrect harness routing and pump pressure connections of the hydraulic pressure switch harnesses of affected engines. EASA AD 20210128 also describes corrective actions including a visual inspection to identify the clip points where harnesses are not installed correctly, harness re-routing, and hydraulic system testing. 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.
FAAs Determination This product has been approved by the aviation authority of another country, and is approved for operation in the United States. Pursuant to the FAAs bilateral agreement with the State of Design Authority, the FAA has been notified of the unsafe condition described in the MCAI referenced above. The FAA is issuing this AD

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