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Rules and Regulations
Federal Register Vol. 86, No. 208
Monday, November 1, 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. FAA20210946; Project Identifier MCAI202101020E; Amendment 3921793; AD 20212220
RIN 2120AA64

Airworthiness Directives; Austro Engine GmbH Engines Federal Aviation Administration FAA, DOT.
ACTION: Final rule; request for comments.
AGENCY:

The FAA is adopting a new airworthiness directive AD for certain Austro Engine GmbH E4 and E4P model diesel piston engines. This AD was prompted by reports of failure of the high-pressure pump HPP driving gear and a subsequent determination that a batch of HPP driving gears may have been damaged during assembly. This AD requires, for engines with an affected cylinder head, inspection of the HPP driving gear and, depending on the results of the inspection, replacement of the HPP driving gear with a part eligible for installation. This AD also requires, for engines with an affected HPP driving gear, replacement of the HPP driving gear either before further flight or within a certain number of flight hours after the effective date of this AD. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective November 16, 2021.
The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD
as of November 16, 2021.
The FAA must receive comments on this AD by December 16, 2021.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:

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SUMMARY:

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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, M
30, 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 service information identified in this final rule, contact Austro Engine GmbH, Rudolf-Diesel-Strasse 11, 2700
Weiner Neustadt, Austria; phone: +43
2622 23000; 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
0946.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210946; 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:
Background The European Union Aviation Safety Agency EASA, which is the Technical Agent for the Member States of the European Community, issued EASA AD
20210203R1, dated September 24, 2021
referred to after this as the MCAI, for Austro Engine GmbH E4 and E4P model diesel piston engines, to address the unsafe condition on these products. The MCAI states:

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Occurrences were reported of HPP driving gear failure. Subsequent investigation determined that a certain batch of HPP
driving gears was produced with a worn out assembly tool P/N AE300T0121. Those HPP
driving gears may have been damaged during assembly. Concurrently, it was determined that, for engines equipped with a certain cylinder head, a stack up of tolerances exists between the cylinder head, cylinder head cover, camshaft gear and HPP gear. Both scenarios could result in premature HPP gear failure.
This condition, if not corrected, could lead to engine in-flight shut-down with consequent forced landing, possibly resulting in damage to the aeroplane and injury to occupants. To address this potential unsafe condition, Austro Engine published the inspection SB, as defined in this EASA AD, to provide instructions for HPP gear inspection on engines equipped with an affected cylinder head, as defined in this EASA AD. Austro Engine also published the replacement SB, as defined in this EASA AD, to provide instructions for replacement of affected HPP gears, as defined in this EASA AD. For the reason described above, EASA issued Emergency AD 2021
0203E to require inspection and/or replacement of HPP gears.

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.
FAA20210946.
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. The FAA is issuing this AD
because the agency evaluated all the relevant information provided by EASA
and has determined that 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
E4035/1, Revision No. 1, dated September 30, 2021 MSBE4035/1;
and Austro Engine Mandatory Service Bulletin No. MSBE4034/3, Revision No. 3, dated September 30, 2021 MSB
E4034/3.
Austro Engine MSBE4035/1
specifies procedures for inspecting HPP
driving gears installed on E4 and E4P

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