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Federal Register / Vol. 86, No. 192 / Thursday, October 7, 2021 / Rules and Regulations
The FAA must receive comments on this AD by November 22, 2021.
ADDRESSES: 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, 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 AERO AT Sp. z o.o., Dzia5 Serwisu, ul. Wa5
Miedzeszynski 844, 03942 Warszawa, Poland; phone: +48 22 616 20 87; fax:
+48 22 617 85 28; email: service@at3.com. You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 901 Locust, Kansas City, MO
64106. For information on the availability of this material at the FAA, call 816 3294148. It is also available at https www.regulations.gov by searching for and locating Docket No.
FAA20210782.
Examining the AD Docket
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You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210782; 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 MCAI, any comments received, and other information. The street address for the Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Doug Rudolph, Aviation Safety Engineer, FAA, General Aviation &
Rotorcraft Section, International Validation Branch, 901 Locust, Room 301, Kansas City, MO 64106; phone:
816 3294059; fax: 816 3294090;
email: doug.rudolph@faa.gov.
SUPPLEMENTARY INFORMATION:

rule, 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 this final rule because of those comments.
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 received about this final rule.

To address this unsafe condition, AERO
issued mandatory service bulletin MSB
EPB.01.B to provide inspection instructions for certain propellers, and EASA issued Emergency AD 20090134E to require repetitive detailed visual inspections of those propeller hubs and, depending on findings, replacement.
Since that EASA AD was issued, additional occurrences were reported of finding propeller hub cracks. Prompted by these findings, AERO issued MSB EPB.02.B
applicable to propellers with s/n 3E.089 and higher.
For the reason described above, this EASA AD retains the requirements of EASA
Emergency AD 20090134E, which is superseded, and expands the Applicability to all propeller s/n.

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 AD 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 AD, 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 AD. Submissions containing CBI
should be sent Doug Rudolph, Aviation Safety Engineer, FAA, General Aviation & Rotorcraft Section, International Validation Branch, 901 Locust, Room 301, Kansas City, MO 64106. Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.

You may examine the MCAI in the AD docket at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0782.

Comments Invited
Background The European Union Aviation Safety Agency EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD
20210189E, dated August 9, 2021
referred to after this as the MCAI, to address an unsafe condition on ELPROP
311P propellers that are installed on, but not limited to, AERO Models AT
3R100 and AT4LSA airplanes. The MCAI states:

The FAA invites you to send any written data, views, or arguments about this final rule. Send your comments to an address listed under ADDRESSES.
Include Docket No. FAA20210782
and Project Identifier MCAI2021
00915A at the beginning of your comments. The most helpful comments reference a specific portion of the final
Occurrences have been reported of finding cracks on the propeller hub during service inspections. Cracks were detected on the propeller hub surface, near the blade attachment bolt holes and in the blade root area.
This condition, if not detected and corrected, could lead to loss of the propeller blade with consequent loss of control of the aeroplane.

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Related Service Information Under 1
CFR Part 51
The FAA reviewed AERO Mandatory Service Bulletin MSB EPB.01.B, Issue 1, dated May 14, 2009, which applies to propellers with serial numbers 3E.001
through 3E.088; and AERO MSB
EPB.02.B, Issue 1, dated July 20, 2021, which applies to propellers with serial numbers 3E.089 and larger. This service information specifies procedures for inspecting the propeller hub for cracks and contacting the design approval holder for corrective action. This service information is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in ADDRESSES.
FAAs Determination This product has been approved by the aviation authority of another country, and is approved for operation in the United States. Pursuant to the FAAs bilateral agreement with this State of Design Authority, it has notified the FAA of the unsafe condition described in the MCAI and service information referenced above. The FAA
is issuing this AD because it has determined the unsafe condition described previously is likely to exist or develop on other products of the same type design.
AD Requirements This AD requires accomplishing the actions specified in the service information already described.
Differences Between This AD and the MCAI
The MCAI applies to the Model AT
4LSA airplane, and this AD does not
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