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Rules and Regulations
Federal Register Vol. 86, No. 149
Friday, August 6, 2021

Docket No. FAA20210654; Project Identifier MCAI202100682E; Amendment 3921684; AD 20211701

p.m., Monday through Friday, except Federal holidays.
For service information identified in this final rule, contact Austro Engine GmbH, Rudolf-Diesel-Strasse 11, 2700
Weiner Neustadt, Austria; phone: +43
2622 23000 2525; website:
www.austroengine.at. You may view this service information 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 781 238
7759. It is also available at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0654.

RIN 2120AA64

Examining the AD Docket
Airworthiness Directives; Austro Engine GmbH Engines
You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210654; 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 street address for the Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Wego Wang, Aviation Safety Engineer, ECO Branch, FAA, 1200 District Avenue, Burlington, MA 01803; phone:
781 2387134; fax: 781 2387199;
email: wego.wang@faa.gov.
SUPPLEMENTARY INFORMATION:

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

Federal Aviation Administration FAA, DOT.
ACTION: Final rule; request for comments.
AGENCY:

The FAA is adopting a new airworthiness directive AD for all Austro Engine GmbH E4 and E4P model diesel piston engines. This AD was prompted by a report of oil pressure loss on an E4 model diesel piston engine.
This AD requires removing a certain oil pump from service and replacing it with a part eligible for installation. The FAA
is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective August 23, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of August 23, 2021.
The FAA must receive comments on this AD by September 20, 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: 202 4932251.
Mail: U.S. Department of Transportation, Docket Operations, 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

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SUMMARY:

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Background The European Union Aviation Safety Agency EASA, which is the Technical Agent for the Member States of the European Community, issued EASA
Emergency AD 20210143E, dated June 16, 2021 referred to after this as the MCAI, to address the unsafe condition on these products. The MCAI
states:
An occurrence was reported of oil pressure loss on an E4 engine. Subsequent investigation determined that a certain batch of oil pumps was produced with a dimensional deviation on the inner gear/
shaft. The inner gear/shaft of those pumps may come into contact with the pump housing, which might create debris and cause jamming of the oil pump.
This condition, if not corrected, could lead to engine in-flight shut-down with consequent forced landing, possibly resulting
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in damage to the aeroplane and injury to occupants.
To address this potential unsafe condition, Austro Engine published the service bulletin to provide instructions to replace the affected oil pumps.
For the reason described above, this EASA AD requires replacement of affected parts with serviceable parts, as defined in this EASA AD. This EASA AD also prohibits reinstallation of affected parts on all engines.

You may obtain further information by examining the MCAI in the AD
docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210654.
FAAs Determination This product has been approved by EASA and is approved for operation in the United States. Pursuant to our bilateral agreement with the European Community, EASA has notified the FAA
of the unsafe condition described in the MCAI and service information. The FAA is issuing this AD because the agency evaluated all the relevant information provided by EASA and determined the unsafe condition described previously is likely to exist or develop in other products of the same type design.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Austro Engine Mandatory Service Bulletin No. MSB
E4031/1, Revision No. 1, dated July 1, 2021. This service information specifies procedures for replacing the affected oil pump installed on E4 and E4P model diesel piston engines. In addition, this service information identifies the applicable part number and serial numbers of affected oil pumps requiring replacement and an additional oil pump replacement option. This service information is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in ADDRESSES.
AD Requirements This AD requires removing the affected oil pump from service and replacing it with a part eligible for installation.
Justification for Immediate Adoption and Determination of the Effective Date Section 553b3B of the Administrative Procedure Act APA 5

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