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Federal Register / Vol. 86, No. 43 / Monday, March 8, 2021 / Rules and Regulations
this AD to address the unsafe condition on these products.
DATES: This AD becomes effective March 23, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of March 23, 2021.
The FAA must receive comments on this AD by April 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: 2024932251.
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 IBR material in this AD, contact the EASA, Konrad-Adenauer-Ufer 3, 50668 Cologne, Germany; telephone +49
221 8999 000; email ADs@
easa.europa.eu; internet www.easa.europa.eu. You may find this material on the EASA website at https
ad.easa.europa.eu. You may view this material at the FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N321, Fort Worth, TX 76177. For information on the availability of this material at the FAA, call 817 2225110. It is also available in the AD docket on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20210095.

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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
0095; 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, any comments received, and other information. The street address for Docket Operations is listed above.
Comments will be available in the AD
docket shortly after receipt.
FOR FURTHER INFORMATION CONTACT:
Kristi Bradley, Aviation Safety Engineer, General Aviation & Rotorcraft Section, International Validation Branch, FAA, 10101 Hillwood Pkwy., Fort Worth, TX
76177; telephone 817 2225110; email kristin.bradley@faa.gov.
SUPPLEMENTARY INFORMATION:

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Discussion
Requirements of This AD

The EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD
20200224R1, dated November 11, 2020
EASA AD 20200224R1, to correct an unsafe condition for all Airbus Helicopters Model AS 350 B, AS 350
BA, AS 350 BB, AS 350 B1, AS350 B2, AS 350 D, AS 355 E, AS 355 F, AS 355
F1, AS 355 F2, and AS 355 N
helicopters. EASA AD 20200224R1
revises EASA AD 20200224E, dated October 16, 2020, to expand the list of serviceable parts post-mod 075580.
This AD was prompted by two reports of large debonding of the T/R blade leading edge protection shields.
According to EASA, the design and assembly procedure of the affected part pre-mod 075580 is such that rapid debonding can occur if humidity/liquid water reaches the bonding surface between the leading edge and blade spar. The FAA is issuing this AD to prevent failure of the T/R blade, which could result in loss of tail rotor control and subsequent loss of control of the helicopter. See the EASA AD for additional background information.

This AD requires accomplishing the actions specified in EASA AD 2020
0224R1, described previously, as incorporated by reference, except for any differences identified as exceptions in the regulatory text of this AD and except as discussed under Differences Between this AD and the EASA AD.
Additionally, the owner/operator pilot may perform the required visual checks but must enter compliance with the applicable paragraph of this AD in the helicopter maintenance records in accordance with 14 CFR 43.9a1
through 4 and 91.417a2v. A pilot may perform these checks because they only involve visually checking affected T/R blade leading edge protection shields and bonding strips. This action can be performed equally well by a pilot or a mechanic. This check is an exception to the FAAs standard maintenance regulations.

Related IBR Material Under 1 CFR Part 51
EASA AD 20200224R1 specifies repetitively visually inspecting each T/
R blade leading edge protection shield and repetitively tap inspecting each T/
R blade leading edge. EASA AD 2020
0224R1 also prohibits the installation of an affected part and specifies a longerterm modification to replace each affected part with a serviceable part.
EASA AD 20200224R1 states that replacing all affected parts with serviceable parts on a helicopter constitutes terminating action for the repetitive visual and tap inspections.
This material is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in the ADDRESSES section.
FAAs Determination These helicopters have been approved by EASA and are approved for operation in the United States. Pursuant to the FAAs bilateral agreement with the European Union, EASA has notified the FAA about the unsafe condition described in its AD. The FAA is proposing this AD after evaluating all known relevant information and determining that the unsafe condition described previously is likely to exist or develop on other helicopters of these same type designs.

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Explanation of Required Compliance Information In the FAAs ongoing efforts to improve the efficiency of the AD
process, the FAA initially worked with Airbus and EASA to develop a process to use certain EASA ADs as the primary source of information for compliance with requirements for corresponding FAA ADs. The FAA has since coordinated with other manufacturers and civil aviation authorities CAAs to use this process. As a result, EASA AD
20200224R1 will be incorporated by reference in the FAA final rule. This AD
would, therefore, require compliance with EASA AD 20200224R1 in its entirety, through that incorporation, except for any differences identified as exceptions in the regulatory text of this AD. Using common terms that are the same as the heading of a particular section in the EASA AD does not mean that operators need comply only with that section. For example, where the AD
requirement refers to all required actions and compliance times, compliance with this AD requirement is not limited to the section titled Required Actions and Compliance Times in the EASA AD. Service information specified in EASA AD
20200224R1 that is required for compliance with EASA AD 2020
0224R1 is available on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20210095.
Differences Between This AD and the EASA AD
The EASA AD applies to all Model AS 350 B, AS 350 BA, AS 350 BB, AS

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