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Federal Register / Vol. 86, No. 126 / Tuesday, July 6, 2021 / Proposed Rules
with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce.
This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action.
Regulatory Findings The FAA has determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would not have a substantial direct effect on the States, on the relationship between the national Government and the States, or on the distribution of power and responsibilities among the various levels of government.
For the reasons discussed above, I
certify that the proposed regulation:
1 Is not a significant regulatory action under Executive Order 12866, 2 Would not affect intrastate aviation in Alaska, and 3 Would not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

c Applicability This AD applies to all Hoffmann GmbH &
Co. KG HOV 72 propellers.
d Subject Joint Aircraft System Component JASC
Code 6114, Propeller Hub Section.
e Unsafe Condition This AD was prompted by reports of cracks at different positions on two affected propeller hubs. The FAA is issuing this AD
to prevent failure of the propeller hub. The unsafe condition, if not addressed, could result in release of the propeller, damage to the airplane, and injury to persons on the ground.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions 1 Before the next flight after December 22, 2020 the effective date of AD 20202505, amend the existing aircraft flight manual by inserting the procedure: Abnormal propeller vibrations: As applicable, reduce engine RPM.
2 Before the next flight after the effective date of this AD, and thereafter, before the next flight after any flight where abnormal propeller vibrations have been experienced, visually inspect propeller hub HOV 72
for cracks using paragraph 2.1 of Hoffmann Propeller GmbH & Co. KG Service Bulletin SB E53, Rev. D, dated February 18, 2021 the SB.
3 Within 20 flight hours after the effective date of this AD, perform a non-destructive test NDT inspection of propeller hub HO
V 72 using paragraph 2.3 of the SB.
4 If, during any inspection required by paragraph g2 or 3 of this AD, any crack is detected, replace propeller hub HOV 72
with a part eligible for installation.
5 During each overhaul of propeller hub HOV 72 after the effective date of this AD, perform an NDT inspection using paragraph 2.3 of the SB.

h Definition For the purpose of this AD, a part eligible for installation is a propeller hub HOV 72
with zero hours time since new or a propeller hub HOV 72 that has passed an NDT inspection using paragraph 2.3 of the SB.

Hoffmann GmbH & Co. KG: Docket No.
FAA20210546; Project Identifier MCAI202100387P.

i Non-Required Actions 1 Sending the propeller to Hoffmann for investigation, as contained in paragraph 2.1
of the SB, is not required by this AD.
2 Reporting propeller hubs with cracks to Hoffmann, as contained in paragraph 2.3 of the SB, is not required by this AD.

a Comments Due Date The FAA must receive comments on this airworthiness directive AD by August 20, 2021.

j Credit for Previous Actions You may take credit for the initial visual inspection and NDT inspection of the propeller hub required by paragraphs g2,
Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by:
a. Removing Airworthiness Directive AD 20202505, Amendment 3921347
85 FR 78702, December 7, 2020; and b. Adding the following new airworthiness directive:

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b Affected ADs This AD replaces AD 20202505, Amendment 3921347 85 FR 78702, December 7, 2020.

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3, and 5 of this AD if you performed any of these actions before the effective date of this AD using Hoffmann Propeller GmbH &
Co. KG SB E53 Rev. A, dated October 9, 2020;
Rev. B, dated October 14, 2020; or Rev. C, dated December 9, 2020.
k Special Flight Permit A special flight permit may be issued in accordance with 14 CFR 21.197 and 21.199
to operate the airplane to a service facility to perform the NDT inspection. Special flight permits are prohibited to perform the visual inspection of the propeller hub.
l Alternative Methods of Compliance AMOCs 1 The Manager, Boston ACO 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 certification office, send it to the attention of the person identified in Related Information.
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.
m Related Information 1 For more information about this AD, 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.
2 Refer to European Union Aviation Safety Agency EASA AD 20200226R1, dated March 31, 2021, for more information.
You may examine the EASA AD in the AD
docket at https www.regulations.gov by searching for and locating it in Docket No.
FAA20210546.
3 For service information identified in this AD, 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 referenced 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.
Issued on June 29, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202114271 Filed 7221; 8:45 am BILLING CODE 491013P

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