DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2021-0574; Project Identifier 2019-SW-073-AD; Amendment
39-21725; AD 2021-19-07]
Airworthiness Directives; Helicopteres Guimbal Helicopters
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
SUMMARY: The FAA is adopting a new airworthiness directive (AD)
certain 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 non-
rotating 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,
ADDRESSES: For service information identified in this final rule,
contact Helicopteres Guimbal, 1070, rue du Lieutenant
Parayre, Aerodrome d'Aix-en-Provence, 13290 Les Milles, France;
telephone 33-04-42-39-10-88; email firstname.lastname@example.org; 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 6N-321, 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.
Examining the AD Docket
You may examine the AD docket at https://www.regulations.gov by
searching for and locating Docket No. FAA-2021-0574; 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 W12-140, 1200 New Jersey Avenue SE, Washington, DC
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) 228-7323; email Darren.Gassetto@faa.gov.
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 non-
rotating scissor link with a serviceable part. The NPRM was prompted by
EASA AD 2019-0186, dated July 30, 2019 (EASA AD 2019-0186), 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) G41-
10-200. 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 2019-0186 requires replacement of affected MR
non-rotating scissor links with serviceable parts.
Discussion of Final Airworthiness Directive
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.
These helicopters have been approved by EASA and are approved for
operation in the United States. Pursuant to the FAA's 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 15-015, 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 G41-10-200, with a serviceable part, P/N
G41-10-201 (by installing scissor link assembly, P/N G41-12-100, which
includes MR non-rotating scissor link, P/N G41-10-201) 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 15-015, Revision
A, dated July 20, 2015 (SB 15-015, Revision A); and SB 15-015, Revision
B, dated July 12, 2019 (SB 15-015, Revision B). SB 15-015, Revision A,
describes procedures for replacing a MR non-rotating scissor link, P/N
G41-10-200, with P/N G41-12-100, which has a new, improved design. SB
15-015, Revision B, describes the same procedures as SB 15-015,
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:
Estimated Costs for Required Actions
||1 work-hour x $85 per hour =
Authority for This Rulemaking
Title 49 of the United States Code specifies the FAA's authority to
issue rules on aviation safety. Subtitle I, section 106, describes the
authority of the FAA Administrator. Subtitle VII: Aviation Programs,
describes in more detail the scope of the Agency's authority.
The FAA is issuing this rulemaking under the authority described in
Subtitle VII, Part A, Subpart III, Section 44701: General requirements.
Under that section, Congress charges the FAA with promoting safe flight
of civil aircraft in air commerce by prescribing regulations for
practices, methods, and procedures the Administrator finds necessary
for safety in air commerce. This regulation is within the scope of that
authority because it addresses an unsafe condition that is likely to
exist or develop on helicopters identified in this rulemaking action.
This AD will not have federalism implications under Executive Order
13132. This AD will not have a substantial direct effect on the States,
on the relationship between the national government and the States, or
on the distribution of power and responsibilities among the various
levels of government.
For the reasons discussed above, I certify that this AD:
(1) Is not a ``significant regulatory action'' under Executive
(2) Will not affect intrastate aviation in Alaska, and
(3) Will not have a significant economic impact, positive or
negative, on a substantial number of small entities under the criteria
of the Regulatory Flexibility Act.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 14 CFR part 39 as follows:
PART 39--AIRWORTHINESS DIRECTIVES
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
2. The FAA amends Sec. 39.13 by adding the following new airworthiness