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Federal Register / Vol. 86, No. 47 / Friday, March 12, 2021 / Rules and Regulations
more protective of public health than TSAs mandatory measures.
II. TSOB Ratification The Aviation and Transportation Security Act the Act establishes the TSOB and provides that the TSOB shall review and ratify or disapprove security directives issued by TSA under 49 U.S.C. 114l2.7 The Act further states that such directives shall remain effective for a period not to exceed 90
days unless ratified or disapproved by the Board or rescinded by the Administrator. 8
Pursuant to these authorities, the Senior Official Performing the Duties of the Deputy Secretary of Homeland Security, in his capacity as chairman of the TSOB, requested TSOB review of the SD.9 On February 28, 2021, the TSOB ratified TSA Security Directive 1582/842101. As part of this ratification, the TSOB also ratified any extension of the SD for a period no longer than the period of time that the Secretarys national emergency determination and the CDC Order remain in effect should the TSA
Administrator determine that such an extension is warranted to support implementation of the Executive Order, the national emergency determination, and the CDC order.
The SD is available in the docket for this notice at https
www.regulations.gov/.
David P. Pekoske, Senior Official Performing the Duties of Deputy Secretary of Homeland Security &
Chairman of the Transportation Security Oversight Board, U.S. Department of Homeland Security.
FR Doc. 202105241 Filed 31021; 4:15 pm BILLING CODE 91109MP

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20201123; Project Identifier MCAI202001294R; Amendment 3921448; AD 20210505
RIN 2120AA64

Airworthiness Directives; Airbus Helicopters Federal Aviation Administration FAA, DOT.
ACTION: Final rule.
AGENCY:

7 49

U.S.C. 115a and c1.
114l2B.
9 DHS Delegation No. 7071.1, Delegation to the Deputy Secretary to Chair the Transportation Security Oversight Board Apr. 2, 2007.
8 Id.

VerDate Sep<11>2014

19:32 Mar 11, 2021

Jkt 253001

The FAA is superseding Airworthiness Directive AD 201623
05, which applied to certain Airbus Helicopters Model SA365N1, AS
365N2, AS 365 N3, SA366G1, EC 155B, and EC155B1 helicopters. AD 201623
05 required repetitive checks of the oil level of the tail rotor gearbox and, if necessary, filling the oil to the maximum level; and replacement of a certain control rod double bearing bearing with a new bearing. This AD
retains the requirements of AD 2016
2305 and also requires modifying the helicopter by replacing the tail gearbox TGB control shaft guide bushes;
repetitive inspections of the TGB
magnetic plug and corrective actions if necessary; repetitive replacements of the bearing; and modifying the helicopter by replacing the TGB; as specified in a European Aviation Safety Agency now European Union Aviation Safety Agency EASA AD, which is incorporated by reference. This AD also adds helicopters to the applicability.
This AD was prompted by reports of occurrences of loss of yaw control due to failure of the TGB bearing. The FAA
is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective April 16, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of April 16, 2021.
ADDRESSES: For material incorporated by reference IBR 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 8172225110. It is also available in the AD docket on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20201123.
SUMMARY:

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. FAA2020
1123; 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, any comments received, and other information. The address for Docket
PO 00000

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Operations is U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:

Kathleen Arrigotti, Aviation Safety Engineer, Large Aircraft Section, International Validation Branch, FAA, 2200 South 216th St., Des Moines, WA
98198; telephone and fax 206231
3218; email kathleen.arrigotti@faa.gov.
SUPPLEMENTARY INFORMATION:

Discussion The EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD
20170125, dated July 21, 2017 EASA
AD 20170125 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for all Airbus Helicopters Model SA 365 N1, AS 365
N2, AS 365 N3, SA 366 G1, EC 155 B, and EC 155 B1 helicopters. EASA AD
20170125 supersedes EASA AD 2017
0007, dated January 13, 2017, which superseded EASA AD 20160097R1, dated May 25, 2016 which corresponds to FAA AD 20162305. EASA AD
20170125 adds helicopters to the applicability, adds repetitive inspections of the magnetic plug after bearing replacement, requires the use of the revised Airbus Helicopters Alert Service Bulletin ASB instructions, and requires replacement of the TGB with a modified unit, which terminates the repetitive inspections.
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 to supersede AD 20162305, Amendment 3918712 81 FR 85126, November 25, 2016 AD 20162305.
AD 20162305 applied to certain Airbus Helicopters Model SA365N1, AS365N2, AS 365 N3, SA366G1, EC
155B, and EC155B1 helicopters. The NPRM published in the Federal Register on December 14, 2020 85 FR
80689. The NPRM was prompted by a determination that additional inspections, replacements, and modifications are necessary to address the unsafe condition. The NPRM
proposed to retain the requirements of AD 20162305 and also require modifying the helicopter by replacing the TGB control shaft guide bushes;
repetitive inspections of the TGB
magnetic plug and corrective actions if necessary; repetitive replacements of the bearing; and modifying the helicopter by replacing the TGB; as specified in an EASA AD. The NPRM also proposed to add helicopters to the applicability.

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