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2021-19-07 HELICOPTERES GUIMBAL: Amendment 39-21725; Docket No. FAA-2021-0574; Project Identifier 2019-SW-073-AD.
(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective November 4, 2021.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD  applies to Hélicoptères Guimbal  Model  CABRI G2 helicopters,
    certificated  in  any  category,  with  main  rotor  (MR) non-rotating
    scissor links, part number (P/N) G41-10-200 installed.

(d) SUBJECT

    Joint Aircraft Service Component (JASC) Code:  6700, Rotorcraft Flight
    Control.

(e) UNSAFE CONDITION

    This AD was prompted by a report  that during scheduled maintenance on
    two helicopters, cracks were found on the MR non-rotating scissor link
    with P/N G41-10-200. The FAA is issuing this AD to address cracking of
    a MR non-rotating scissor link. 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.

(f) COMPLIANCE

    Comply with this AD within the compliance times specified,  unless al-
    ready done.

(g) REQUIRED ACTIONS

(1) Within 50 hours time-in-service  or 2 months  after the effective date
    of this AD, whichever occurs first, modify the helicopter by replacing
    the MR non-rotating scissor link,  P/N G41-10-200,  with a serviceable
    scissor link assembly, P/N G41-12-100, in accordance with the Required
    Actions, IPC 4.1-2 (a) through (d) inclusive, of Guimbal Service Bull-
    etin SB 15-015, Revision C, dated August 27, 2019.

(2) As of the effective date of this AD,  do not install a MR non-rotating
    scissor link, P/N G41-10-200, on any helicopter.

(h) CREDIT FOR PREVIOUS ACTIONS

    This paragraph provides credit  for actions required  by paragraph (g)
    (1) of this AD,  if those actions were performed  before the effective
    date of this AD  using the service information specified  in paragraph
    (h)(1) or (2) of this AD.

(1) Guimbal Service Bulletin SB 15-015, Revision A, dated July 20, 2015.

(2) Guimbal Service Bulletin SB 15-015, Revision B, dated July 12, 2019.

(i) SPECIAL FLIGHT PERMITS

    Special flight permits,  as described in 14 CFR 21.197 and 21.199, are
    prohibited.

(j) ALTERNATIVE METHODS OF COMPLIANCE (AMOCS)

(1) The Manager, International Validation Branch,  FAA,  has the authority
    to approve AMOCs for this AD, if requested using the procedures  found
    in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to
    your principal inspector or local Flight Standards District Office, as
    appropriate. If  sending information  directly to  the manager  of the
    International  Validation  Branch, send  it  to the  attention  of the
    person identified in paragraph (k)(1)  of this AD. Information may  be
    emailed to: 9-AVS-AIR730-AMOC@faa.gov.

(2) Before using any approved AMOC,  notify your appropriate principal in-
    spector,  or  lacking a principal inspector,  the manager of the local
    flight standards district office/certificate holding district office.

(k) RELATED INFORMATION

(1) For more information about this AD, 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.

(2) Service information  identified in this AD that is not incorporated by
    reference is available at the addresses specified in paragraphs (l)(3)
    and (4) of this AD.

(3) The subject of this AD is addressed  in European Union Aviation Safety
    Agency (EASA) AD 2019-0186, dated July 30, 2019. You may view the EASA
    AD at https://www.regulations.gov in Docket No. FAA-2021-0574.

(l) MATERIAL INCORPORATED BY REFERENCE

(1) The Director of the Federal Register  approved  the  incorporation  by
    reference of the service information listed  in this paragraph under 5
    U.S.C. 552(a) and 1 CFR part 51.

(2) You must use this service information  as applicable to do the actions
    required by this AD, unless the AD specifies otherwise.

(i) Guimbal Service Bulletin SB 15-015, Revision C, dated August 27, 2019.

(ii) [Reserved]

(3) For service information  identified in this AD,  contact  Hélicoptères
    Guimbal, 1070, rue du Lieutenant Parayre, Aérodrome d'Aix-en-Provence,
    13290 Les Milles, France;  telephone 33-04-42-39-10-88; email support@
    guimbal.com; or at https://www.guimbal.com.

(4) You may view  this  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.

(5) You may view this service information  that is incorporated  by refer-
    ence at the National Archives and Records Administration  (NARA).  For
    information on the availability of this material  at NARA,  email: fr.
    inspection@nara.gov,   or   go  to:  https://www.archives.gov/federal-
    register/cfr/ibr-locations.html.

Issued on September 1, 2021.  Gaetano A. Sciortino,  Deputy  Director  for
Strategic Initiatives,  Compliance & Airworthiness Division, Aircraft Cer-
tification Service.

FOR FURTHER INFORMATION CONTACT:  Darren Gassetto, Aerospace Engineer, COS
Program Management Section,  Operational Safety Branch,  Compliance & Air-
worthiness Division, FAA, 1600 Stewart Ave, Suite 410, Westbury, NY 11590;
telephone (516) 228-7323; email Darren.Gassetto@faa.gov.
PREAMBLE 

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]
RIN 2120-AA64

Airworthiness Directives; Helicopteres Guimbal Helicopters

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
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,
2021.

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 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 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.
FAA-2021-0574.

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
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) 228-7323; 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 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

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 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

Action
Labor cost
Parts cost
Cost per product
Cost on U.S. operators
Replacement 1 work-hour x $85 per hour = $85
$323
$408
$13,056

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.

Regulatory Findings

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
Order 12866,
(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
reference, Safety.

The Amendment

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
directive: