Voglio sapere a riguardo di…

35416

Federal Register / Vol. 86, No. 126 / Tuesday, July 6, 2021 / Proposed Rules
Section, Operational Safety Branch, 2200
South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 2062313195. This material may be found in the AD docket on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20210545.
2 For more information about this AD, contact Kathleen Arrigotti, Aerospace Engineer, Large Aircraft Section, International Validation Branch, FAA, 2200
South 216th St., Des Moines, WA 98198;
telephone and fax 2062313218; email kathleen.arrigotti@faa.gov.
Issued on June 29, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202114269 Filed 7221; 8:45 am BILLING CODE 491013P

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

Airworthiness Directives; Hoffmann GmbH & Co. KG Propellers Federal Aviation Administration FAA, DOT.
ACTION: Notice of proposed rulemaking NPRM.
AGENCY:

The FAA proposes to supersede Airworthiness Directive AD
20202505, which applies to all Hoffmann GmbH & Co. KG Hoffmann model HOV 72 propellers. AD 2020
2505 requires amending the existing aircraft flight manual AFM with abnormal propeller vibration instructions. AD 20202505 also requires 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 requires replacement of the propeller hub before exceeding 30 years since the date of manufacture. Since the FAA
issued AD 20202505, analyses of the inspection results showed that the 30year life limit of the propeller hub is no longer needed. This proposed AD would retain certain requirements of AD 2020
2505 and remove the 30-year life limit of the propeller hub. The FAA is proposing this AD to address the unsafe condition on these products.
DATES: The FAA must receive comments on this proposed AD by August 20, 2021.

jbell on DSKJLSW7X2PROD with PROPOSALS

SUMMARY:

VerDate Sep<11>2014

16:39 Jul 02, 2021

Jkt 253001

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
p.m., Monday through Friday, except Federal holidays.
For service information identified in this NPRM, contact Hoffmann GmbH &
Co. KG, Kupferlingstrasse 9, 83022, Rosenheim, Germany; phone: +49 0
8031 1878 0; email: info@hoffmannprop.com; website: https hoffmannprop.com. 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.

ADDRESSES:

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 NPRM, the mandatory continuing airworthiness information MCAI, any comments received, and other information. The street address for Docket Operations is listed above.
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:
Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under ADDRESSES. Include Docket No.
FAA20210546; Project Identifier MCAI202100387P at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, explain the reason for any recommended change, and include supporting data. The FAA will consider all comments received by the closing date and may amend the proposal because of those comments.

PO 00000

Frm 00008

Fmt 4702

Sfmt 4702

Except for Confidential Business Information CBI as described in the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to https
www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact we receive about this proposed AD.
Confidential Business Information CBI is commercial or financial information that is both customarily and actually treated as private by its owner.
Under the Freedom of Information Act FOIA 5 U.S.C. 552, CBI is exempt from public disclosure. If your comments responsive to this NPRM
contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this NPRM, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI
as PROPIN. The FAA will treat such marked submissions as confidential under the FOIA, and they will not be placed in the public docket of this NPRM. Submissions containing CBI
should be sent to Michael Schwetz, Aviation Safety Engineer, Boston ACO
Branch, FAA, 1200 District Avenue, Burlington, MA 01803. Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.
Background The FAA issued AD 20202505, Amendment 3921347 85 FR 78702, December 7, 2020, AD 20202505, for all Hoffmann model HOV 72
propellers. AD 20202505 was prompted by reports of cracks at different positions on two affected propeller hubs. AD 20202505 requires amending the existing AFM with abnormal propeller vibration instructions. AD 20202505 also requires 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. AD 20202505 also requires replacement of the propeller hub before exceeding 30 years since the date of manufacture or within 30 days after the effective date of AD 202025
05, whichever occurs later. The agency issued AD 20202505 to prevent failure of the propeller hub.

E:FRFM06JYP1.SGM

06JYP1