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Federal Register / Vol. 86, No. 187 / Thursday, September 30, 2021 / Rules and Regulations
Helicopteres Guimbal Model CABRI G2
helicopters. This AD was prompted by a report that, during scheduled maintenance on two helicopters, cracks were found on a certain main rotor MR
non-rotating scissor link. This AD
requires replacing an affected MR nonrotating scissor link with a serviceable part. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective November 4, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain document listed in this AD
as of November 4, 2021.
ADDRESSES: For service information identified in this final rule, contact Helicopteres Guimbal, 1070, rue du Lieutenant Parayre, Aerodrome dAixen-Provence, 13290 Les Milles, France;
telephone 330442391088; email support@guimbal.com; or at https
www.guimbal.com. You may view the referenced 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 2225110. 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 final rule, the European Union Aviation Safety Agency EASA AD, any comments received, and other information. The street address for Docket 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:
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.
SUPPLEMENTARY INFORMATION:
Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to certain Helicopteres Guimbal Model CABRI G2 helicopters. The NPRM published in the Federal Register on July 23, 2021 86 FR 38943.
In the NPRM, the FAA proposed to require replacing an affected MR nonrotating scissor link with a serviceable part. The NPRM was prompted by EASA AD 20190186, dated July 30, 2019 EASA AD 20190186, issued by EASA, which is the Technical Agent for the Member States of the European Union, to correct an unsafe condition for certain Helicopteres Guimbal Model CABRI G2 helicopters. 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.
Discussion of Final Airworthiness Directive Comments The FAA gave the public the opportunity to participate in developing this final rule. The FAA received no comments on the NPRM or on the determination of the cost to the public.
Conclusion 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 reviewed the relevant data and determined that air safety requires adopting this AD as proposed. Accordingly, the FAA is issuing this AD to address the unsafe condition on these helicopters. Except for minor editorial changes, this AD is adopted as proposed in the NPRM.
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 G4110
200, with a serviceable part, P/N G41
10201 by installing scissor link assembly, P/N G4112100, which includes MR non-rotating scissor link, P/N G4110201 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
non-rotating scissor link, P/N G4110
200, with P/N G4112100, which has a new, improved design. SB 15015, Revision B, describes the same procedures as SB 15015, Revision A, and includes a revised compliance time, an updated Situation section, and added an action.
Costs of Compliance The FAA estimates that this AD
affects 32 helicopters of U.S. registry.
The FAA estimates the following costs to comply with this AD:

LOTTER on DSK11XQN23PROD with RULES1

ESTIMATED COSTS FOR REQUIRED ACTIONS
Action
Labor cost
Replacement

1 work-hour $85 per hour = $85

$323

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Parts cost
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Cost per product $408

Cost on U.S.
operators $13,056