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Federal Register / Vol. 86, No. 231 / Monday, December 6, 2021 / Rules and Regulations 3 An AMOC that provides an acceptable level of safety may be used for any repair, modification, or alteration required by this AD if it is approved by The Boeing Company Organization Designation Authorization ODA that has been authorized by the Manager, Seattle ACO Branch, FAA, to make those findings. To be approved, the repair method, modification deviation, or alteration deviation must meet the certification basis of the airplane, and the approval must specifically refer to this AD.
j Related Information For more information about this AD, contact Greg Rutar, Aerospace Engineer, Airframe Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA
98198; phone and fax: 2062313529; email:
Greg.Rutar@faa.gov.
k 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 Boeing Alert Requirements Bulletin B78781205SB53007500 RB, Issue 001, dated September 8, 2020.
ii Boeing Alert Requirements Bulletin B78781205SB53007600 RB, Issue 001, dated September 8, 2020.
3 For service information identified in this AD, contact Boeing Commercial Airplanes, Attention: Contractual & Data Services C&DS, 2600 Westminster Blvd., MC 110SK57, Seal Beach, CA 907405600;
telephone 5627971717; internet https
www.myboeingfleet.com.
4 You may view this service information 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.
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, fr.inspection@nara.gov, or go to: https
www.archives.gov/federal-register/cfr/ibrlocations.html.

khammond on DSKJM1Z7X2PROD with RULES

Issued on November 5, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202126393 Filed 12321; 8:45 am BILLING CODE 491013P

VerDate Sep<11>2014

15:44 Dec 03, 2021

Jkt 256001

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210546; Project Identifier MCAI202100387P; Amendment 3921815; AD 20212317
RIN 2120AA64

Airworthiness Directives; Hoffmann GmbH & Co. KG Propellers Federal Aviation Administration FAA, DOT.
ACTION: Final rule.
AGENCY:

The FAA is superseding Airworthiness Directive AD 202025
05 for all Hoffmann GmbH & Co. KG
Hoffmann model HOV 72 propellers.
AD 20202505 required amending the existing aircraft flight manual AFM
with abnormal propeller vibration instructions. AD 20202505 also required visual inspection and nondestructive test NDT inspection of the propeller hub and, depending on the results of the inspections, replacement of the propeller hub with a part eligible for installation. AD 20202505 also required replacement of the propeller hub before exceeding 30 years since the date of manufacture. This AD was prompted by reports of cracks at different positions on two affected propeller hubs and subsequent manufacturer revision of the service information, which showed that the 30year life limit of the propeller hub is no longer needed. This AD requires amending the existing AFM by inserting abnormal propeller vibration instructions, visual inspection and NDT
inspection of the propeller hub and, depending on the results of the inspections, replacement of the propeller hub 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 January 10, 2022.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of January 10, 2022.
ADDRESSES: For service information identified in this final rule, contact Hoffmann GmbH & Co. KG, Kupferlingstrasse 9, 83022, Rosenheim, Germany; phone: +49 0 8031 1878 0;
email: info@hoffmann-prop.com;
website: https hoffmann-prop.com.
You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 1200 District Avenue, Burlington, MA
SUMMARY:

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01803. For information on the availability of this material at the FAA, call 781 2387759. It is also available at https www.regulations.gov by searching for and locating Docket No.
FAA20210546.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210546; 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, the mandatory continuing airworthiness information MCAI, any comments received, and other information. The address for Docket Operations is Document Operations, U.S. Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Michael Schwetz, Aviation Safety Engineer, Boston ACO Branch, FAA, 1200 District Avenue, Burlington, MA
01803; phone: 781 2387761; fax: 781
2387199; email: michael.schwetz@
faa.gov.
SUPPLEMENTARY INFORMATION:

Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 to supersede AD 20202505, Amendment 3921347 85 FR 78702, December 7, 2020, AD 20202505.
AD 20202505 applied to all Hoffmann model HOV 72 propellers. The NPRM
published in the Federal Register on July 6, 2021 86 FR 35416. The NPRM
was prompted by reports of cracks at different positions on two affected propeller hubs and subsequent manufacturer revision of the service information, which showed that the 30year life limit of the propeller hub is no longer needed. In the NPRM, the FAA
proposed to continue to require amending the existing AFM with abnormal propeller vibration instructions. In the NPRM, the FAA also proposed to continue to require visual inspection and NDT inspection of the propeller hub and, depending on the results of the inspections, replacement of the propeller hub with a part eligible for installation. The FAA is issuing this AD to address the unsafe condition on these products.
The European Union Aviation Safety Agency EASA, which is the Technical Agent for the Member States of the European Community, has issued EASA
AD 20200226R1, dated March 31, 2021

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