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Federal Register / Vol. 86, No. 94 / Tuesday, May 18, 2021 / Proposed Rules
Notice of proposed rulemaking NPRM.

ACTION:

The FAA proposes to adopt a new airworthiness directive AD for certain Airbus Helicopters Model AS350B, AS350BA, AS350B1, AS350B2, AS350B3, AS350D, AS355E, AS355F, AS355F1, AS355F2, AS355N, and AS355NP helicopters. This proposed AD was prompted by a report of reduced yaw control, during an approach for landing, that resulted from rupture of the tail rotor gearbox TGB
actuating rod and uncoupling of the steel sleeve from inside the external aluminum tube. This proposed AD
would require dye penetrant inspecting certain TGB actuating rods for a crack, and depending on the inspection results, replacing the TGB actuating rod, as specified in a European Union Aviation Safety Agency EASA AD, which is proposed for incorporation by reference IBR. This proposed AD
would also require marking each TGB
actuating rod, reporting information, and, for certain helicopters, ensuring the correct interface between certain TGB
actuating rods and bearings. 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 July 2, 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 material that is proposed for IBR
in this AD, contact the EASA, KonradAdenauer-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.
FAA20210369.

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SUMMARY:

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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
0369; 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, 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:
Kathleen Arrigotti, Program Manager, Large Aircraft Section, International Validation Branch, Compliance &
Airworthiness Division, FAA, 2200
South 216th St., Des Moines, WA 98198;
telephone and fax 206 2313218; email kathleen.arrigotti@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.
FAA20210369; Project Identifier 2019SW033AD 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 this proposal 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 proposal.
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

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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 Kathleen Arrigotti, Program Manager, Large Aircraft Section, International Validation Branch, Compliance & Airworthiness Division, FAA, 2200 South 216th St., Des Moines, WA 98198; telephone and fax 206 2313218; email kathleen.arrigotti@faa.gov. Any commentary that the FAA receives that is not specifically designated as CBI will be placed in the public docket for this rulemaking.
Discussion The EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD
20190060, dated March 20, 2019
EASA AD 20190060 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for all Airbus Helicopters Model AS 350
B, AS 350 BA, AS 350 BB, AS 350 B1, AS 350 B2, AS 350 B3, AS 350 D, AS
355 E, AS 355 F, AS 355 F1, AS 355 F2, AS 355 N and AS 355 NP helicopters.
Model AS 350 BB helicopters are not certificated by the FAA and are not included on the U.S. type certificate data sheet; this proposed AD therefore does not include those helicopters in the applicability. Although EASA AD
20190060 applies to all helicopters identified in EASA AD 20190060, this proposed AD applies to helicopters with an affected part installed instead.
This proposed AD was prompted by a report of reduced yaw control, during an approach for landing of an AS 350
helicopter, that resulted from rupture of the TGB actuating rod and uncoupling of the steel sleeve from inside the external aluminum tube. Model AS355E, AS355F, AS355F1, AS355F2, AS355N, and AS355NP helicopters are affected due to design similarity of installed TGB actuating rods. The FAA
is proposing this AD to address failure of a TGB actuating rod, which could result in loss of yaw control of the helicopter. See the MCAI for additional background information.
Related Service Information Under 1
CFR Part 51
EASA AD 20190060 describes procedures for dye penetrant inspecting certain TGB actuating rods for a crack, and depending on the inspection results, replacing the TGB actuating rod.
EASA AD 20190060 also describes procedures for marking each TGB
actuating rod, reporting information,
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