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60162

Federal Register / Vol. 86, No. 208 / Monday, November 1, 2021 / Rules and Regulations
Table 1 to Paragraph g3 - HPP Driving Gear Replacement Engine Group
Flight Hours FHs accumulated on the HPP since new
Compliance Time
40 FHs or more
Before next flight after the effective date of this AD

1

Less than 40 FHs 80 FHs or more
Before exceeding 40 FHs since new Before next flight after the effective date of this AD

2

h Definitions 1 For the purpose of this AD, a part eligible for installation is an HPP driving gear that is not an affected HPP driving gear.
2 For the purpose of this AD, engines in Engine Group 1 are Model E4 engines in configuration -A installed on single engine airplanes.
3 For the purpose of this AD, engines in Engine Group 2 are Model E4 engines in configuration -B or -C and Model E4P
engines installed on twin-engine airplanes.
i Special Flight Permit A special flight permit may be issued in accordance with 14 CFR 21.197 and 21.199
to permit a single ferry flight to a location where the actions required by this AD can be accomplished on a twin-engine airplane that has one or two Model E4 engines in configuration -B or -C, or Model E4P
engines, installed.
j Non-Required Actions The requirements to fill out and send the execution report to Austro Engine, as well as the requirement to contact Austro Engine and provide pictures of the driving gear, as set forth in the Accomplishment/Instructions, paragraph 2.1., of MSBE4035/1, are not required by this AD.

lotter on DSK11XQN23PROD with RULES1

k Alternative Methods of Compliance AMOCs 1 The Manager, ECO 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 local Flight Standards District Office, as appropriate. If sending information directly to the manager of the ECO Branch, send it to the attention of the person identified in paragraph l1 of this AD. You may email your request to: ANE-AD-AMOC@faa.gov.
2 Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the local flight standards district office/
certificate holding district office.
l Related Information 1 For more information about this AD, 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.

VerDate Sep<11>2014

16:50 Oct 29, 2021

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Before exceeding 80 FHs since new
2 Refer to European Union Aviation Safety Agency EASA AD 20210203R1, dated September 24, 2021, for more information. You may examine the EASA AD
in the AD docket at https
www.regulations.gov by searching for and locating Docket No. FAA20210946.
m Material Incorporated by Reference 1 The Director of the Federal Register approved the incorporation by reference IBR of the service information listed in this paragraph under 5 U.S.C. 552a and 1 CFR
part 51.
2 You must use this service information as applicable to do the actions required by this AD, unless the AD specifies otherwise.
i Austro Engine Mandatory Service Bulletin MSB No. MSBE4035/1, Revision No. 1, dated September 30, 2021.
ii Austro Engine MSB No. MSBE4034/
3, Revision No. 3, dated September 30, 2021.
3 For Austro Engine service information identified in this AD, you may contact Austro Engine GmbH, Rudolf-Diesel-Strasse 11, 2700
Weiner Neustadt, Austria; phone: +43 2622
23000; website: www.austroengine.at.
4 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 2387759.
5 You may view this service information that is incorporated by reference at the National Archives and Records Administration NARA. For information on the availability of this material at NARA, email: fr.inspection@nara.gov, or go to:
https www.archives.gov/federal-register/cfr/
ibr-locations.html.
Issued on October 27, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202123842 Filed 102821; 11:15 am BILLING CODE 491013P

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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210613; Project Identifier MCAI202001431T; Amendment 3921801; AD 20212303
RIN 2120AA64

Airworthiness Directives; De Havilland Aircraft of Canada Limited Type Certificate Previously Held by Bombardier, Inc. Airplanes Federal Aviation Administration FAA, Department of Transportation DOT.
ACTION: Final rule.
AGENCY:

The FAA is adopting a new airworthiness directive AD for certain De Havilland Aircraft of Canada Limited Model DHC8400, 401, and 402
airplanes. This AD was prompted by a report of cracking found on a main landing gear MLG drag strut assembly.
This AD requires a records review to determine if an affected MLG drag strut assembly is installed, repetitive detailed inspections for cracking of affected strut assemblies, a one-time magnetic particle inspection for cracking, and oncondition actions if necessary. The FAA
is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective December 6, 2021.
ADDRESSES:
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
0613; 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
E:FRFM01NOR1.SGM

01NOR1

ER01NO21.001

Less than 80 FHs