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Federal Register / Vol. 86, No. 170 / Tuesday, September 7, 2021 / Rules and Regulations
The FAA is adopting a new airworthiness directive AD for Helicopteres Guimbal Model Cabri G2
helicopters with any metal bushing installed on the main rotor M/R
swashplate guide bellcrank. This AD
was prompted by a report of cracks discovered on the M/R scissor link during scheduled maintenance on several helicopters. This AD requires removing all metal bushings from service, visually inspecting the lug bore area and depending on the inspection results, removing certain parts from service and installing certain partnumbered plastic bushings. This AD
also prohibits installing any metal bushing on any helicopter. The FAA is issuing this AD to address the unsafe condition on these products.
SUMMARY:

DATES:

This AD is effective October 12,
2021.
For service information identified in this final rule, contact Helicopteres Guimbal, Basile Ginel, 1070, rue du Lieutenant Parayre, Aerodrome dAix-en-Provence, 13290
Les Milles, France; telephone 3304
42391088; email basile.ginel@
guimbal.com; web 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.
ADDRESSES:

Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210498; 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.

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FOR FURTHER INFORMATION CONTACT:

Andrea Jimenez, Aerospace Engineer, COS Program Management Section, Operational Safety Branch, Compliance & Airworthiness Division, FAA, 1600
Stewart Ave., Suite 410, Westbury, NY
11590; telephone 516 2287330; email andrea.jimenez@faa.gov.
SUPPLEMENTARY INFORMATION:

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Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to Helicopteres Guimbal HG
Model Cabri G2 helicopters, certificated in any category, with any metal bushings installed on the main rotor M/R swashplate guide bellcrank and without plastic bushing part number HG221001 or HG modification 16009.
The NPRM published in the Federal Register on July 9, 2021 86 FR 36241.
In the NPRM, the FAA proposed to require within 50 hours time-in-service or 2 months, whichever occurs first after the effective date of this AD, disconnecting the bellcrank from the swashplate guide, removing each bolt and using a certain tool, removing certain parts from service. The NPRM
also proposed to require visually inspecting the lug bore area for corrosion and cracks and depending on the inspection results, removing certain parts from service, or repairing the area using an FAA-approved method, installing certain part-numbered plastic bushings, coating the area with a compound, reinstalling certain parts, applying a specified torque, and installing cotter pins. The NPRM was prompted by EASA AD 20190185, dated July 30, 2019 EASA AD 2019
0185, issued by EASA, which is the Technical Agent for the Member States of the European Union, to correct an unsafe condition for Helicopteres Guimbal Model Cabri G2 helicopters.
EASA advises that during scheduled maintenance on several helicopters, cracks were found on the M/R scissor link due to corrosion. EASA states this corrosion was caused by stress induced by the mounting of the metal bushing inside the lug hole. EASA further states metal bushings are also installed on the M/R swashplate guide bellcrank, where similar cracking may occur. This condition, if not addressed, could result in failure of the M/R swashplate guide bellcrank and reduced control of the helicopter.
Accordingly, EASA AD 20190185
requires replacing any part-numbered metal bushing with plastic bushing part number P/N HG221001. EASA AD
20190185 also prohibits installing any part-numbered metal bushing on the M/
R swashplate guide bellcrank other than P/N HG221001 on any helicopter.
Discussion of Final Airworthiness Directive Comments The FAA received no comments on the NPRM or on the determination of the costs.

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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 products.
Related Service Information The FAA reviewed Guimbal Service Bulletin SB 17003, Revision D, dated August 27, 2019 SB 17003 Rev D.
This service information specifies disconnecting the bellcrank installed on the swashplate guide by removing the bolts that connect the bellcrank to the swashplate guide, removing any existing bushings, and visually inspecting the lug bore area for corrosion or cracks.
This service information also specifies if there is any corrosion or cracks, reporting the information to HG
support, installing the new plastic bushings, reinstalling the bellcrank, applying a specified torque, and installing cotter pins.
Other Related Service Information The FAA also reviewed Guimbal Service Bulletin SB 17003, Revision C, dated July 12, 2019 SB 17003 Rev C.
SB 17003 Rev C specifies the same procedures as SB 17003 Rev D, except SB 17003 Rev D updates the reference to EASA AD 20190185.
Differences Between This AD and EASA
AD 20190185
EASA AD 20190185 applies to all Model Cabri G2 helicopters, whereas this AD only applies to Model Cabri G2
helicopters with any metal bushings installed and without HG modification 16009. The service information required by the EASA AD requires contacting Helicopteres Guimbal for corrective actions when corrosion or cracks are found in the lug bore area whereas this AD requires removing the swashplate guide from service or repairing it using an FAA-approved method.
Costs of Compliance The FAA estimates that this AD
affects 32 helicopters of U.S. Registry.
Labor rates are estimated at $85 per work-hour. Based on these numbers, the FAA estimates the following costs to comply with this AD.
Disconnecting the bellcrank, removing each metal bushing and visually inspecting for corrosion and
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