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Federal Register / Vol. 86, No. 139 / Friday, July 23, 2021 / Proposed Rules
khammond on DSKJM1Z7X2PROD with PROPOSALS

during scheduled maintenance on two helicopters, cracks were found on a certain main rotor MR non-rotating scissor link. This proposed AD would require replacing an affected MR nonrotating scissor link with a serviceable part. 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 August 23, 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 NPRM, contact Helicopteres Guimbal, 1070, rue du Lieutenant Parayre, Aerodrome dAix-en-Provence, 13290 Les Milles, France; telephone 330442391088; email support@
guimbal.com; or at https
www.guimbal.com. You may view this service information 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 817 222
5110. Service information that is incorporated by reference is also available at https www.regulations.gov by searching for and locating Docket No.
FAA20210574.
Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210574; 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, the European Union Aviation Safety Agency EASA AD, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Darren Gassetto, Aerospace Engineer, COS Program Management Section, Operational Safety Branch, Compliance & Airworthiness Division, FAA, 1600
Stewart Ave., Suite 410, Westbury, NY

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11590; telephone 516 2287323; email Darren.Gassetto@faa.gov.
SUPPLEMENTARY INFORMATION:
Comments Invited The FAA invites you to send any written data, views, or arguments about this proposal. Send your comments to an address listed under ADDRESSES.
Include Docket No. FAA20210574;
Project Identifier 2019SW073AD 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 NPRM.
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
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 to Darren Gassetto, Aerospace Engineer, COS Program Management Section, Operational Safety Branch, Compliance & Airworthiness Division, FAA, 1600 Stewart Ave., Suite 410, Westbury, NY 11590; telephone 516
2287323; email Darren.Gassetto@
faa.gov. Any commentary that the FAA
receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.
Background EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD 20190186,
PO 00000

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dated July 30, 2019 EASA AD 2019
0186, to correct an unsafe condition for Helicopteres Guimbal Model CABRI G2
helicopters, all manufacturer serial numbers. EASA advises that, during scheduled maintenance on two helicopters, cracks were found on the MR non-rotating scissor link, part number P/N G4110200. The suspected root cause for the cracking is corrosion due to stress induced by the mounting of the metal bushings inside the lug hole. To address this issue the manufacturer modified the design of the MR non-rotating scissor link to reinforce the lugs and replace the metal bushings with plastic bushings. Cracking of a MR
non-rotating scissor link, if not addressed, could result in failure of that scissor link, resulting in reduced control of the helicopter.
Accordingly, EASA AD 20190186
requires replacement of affected MR
non-rotating scissor links with serviceable parts.
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 issuing 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 the same type design.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Guimbal Service Bulletin SB 15015, Revision C, dated August 27, 2019. This service information specifies procedures for, among other actions, modifying the helicopter by replacing the MR nonrotating scissor link, P/N G4110200, with a serviceable part, P/N G4110
201 by installing scissor link assembly, P/N G4112100, which includes MR
non-rotating scissor link, P/N G4110
201 and torqueing the bolts. 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 the ADDRESSES section.
Other Related Service Information The FAA also reviewed Guimbal Service Bulletin SB 15015, Revision A, dated July 20, 2015 SB 15015, Revision A; and SB 15015, Revision B, dated July 12, 2019 SB 15015, Revision B. SB 15015, Revision A, describes procedures for replacing a MR

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