Airworthiness Directive · Amendment 39-22000 · Rotorcraft flight control
Hélicoptères Guimbal Helicopters
This AD applies to Hélicoptères Guimbal (HG) Model Cabri G2 helicopters, all serial numbers, certificated in any category.
The FAA is superseding Airworthiness Directive (AD) 2021-02- 20, which applied to certain H[eacute]licopt[egrave]res Guimbal (HG) Model Cabri G2 helicopters. AD 2021-02-20 required initial and repetitive inspections of certain rotating and non-rotating scissor fittings, and depending on the results, replacing the affected assembly. AD 2021-02-20 also prohibited installing certain main rotor hubs (MRHs) and swashplate guides unless the initial inspection was accomplished. This AD was prompted by a report of a crack in a rotating scissor fitting. This AD retains certain requirements of AD 2021-02-20, and requires installation of newly designed parts, provides a terminating action for the initial and repetitive inspections, and revises the applicability. This AD also extends the repetitive inspection interval and prohibits installing certain MRHs and swashplate guides. The FAA is issuing this AD to address the unsafe condition on these products.
For helicopters with rotating or non-rotating scissor fitting part number (P/N) G12-00-200, installed on the main rotor hub (MRH) or swashplate guide, respectively:
(1) Within 30 hours time-in-service (TIS) or 30 calendar days, whichever occurs first after February 22, 2021 (the effective date of AD 2021-02-20):
(i) Remove the cotter pins and bolts connecting the rotating and non-rotating scissor fitting by following the Required Actions, IPC 4.1-2 a), of Guimbal Service Bulletin SB 20-012, Revision B, dated October 5, 2020 (SB 20-012 Rev B). Remove the cotter pins from service. Clean each scissor fitting. Using a flashlight, visually inspect each scissor fitting by following the Required Actions, IPC 4.1-2 b), of SB 20-012 Rev B. As an alternative to using SB 20-012 Rev B, you may remove the cotter pins and bolts in accordance with the Required Actions, IPC 4.1-2 a), of Guimbal Service Bulletin SB 20-012, Revision C, dated July 22, 2021 (SB 20-012 Rev C), and visually inspect each scissor fitting in accordance with the Required Actions, IPC 4.1-2 b), of SB 20-012 Rev C.
(ii) If there is a crack, before further flight, replace the MRH or swashplate guide with an airworthy part as applicable; or, as an alternative, you may accomplish the modification specified in paragraph (g)(3) of this AD.
(iii) If there is not a crack, reassemble the scissor fittings by following the Required Actions, IPC 4.1-2 c), of SB 20-012 Rev B. As an alternative to using SB 20-012 Rev B, you may reassemble the scissor fittings in accordance with the Required Actions, IPC 4.1-2 c), of SB 20-012 Rev C.
(2) Thereafter, within 60 hours TIS or 6 months, whichever occurs first after the effective date of this AD, and thereafter at intervals not to exceed 60 hours TIS or 6 months, whichever occurs first:
(i) Leaving each rotating and non-rotating scissor fitting assembled, clean each scissor fitting. Using a flashlight, visually inspect each scissor fitting by following the Required Actions, IPC 4.1-2 a), of Guimbal Service Bulletin SB 20-011, Revision D, dated July 22, 2021.
(ii) If there is a crack, before further flight, replace the MRH or swashplate guide, with an airworthy part as applicable; or, as an alternative, you may accomplish the modification specified in paragraph (g)(3) of this AD.
(3) Within 60 months, or during the next main gearbox overhaul, whichever occurs first after the effective date of this AD, remove MRH P/N G12-00-100, or G12-00-101, or G12-00-102 and swashplate guide P/N G21-01-101 or G21-01-102 from service and modify your helicopter by installing MRH P/N G12-00-103 and swashplate guide P/N G21-01-103 containing scissor fitting P/N G12-00-202 (HG modification (mod) 20-040) by following the Required Actions, IPC 2.1-0 a) through k) and m) through aa) of Guimbal Service Bulletin SB 21-007, Revision C, dated July 22, 2021.
Note 1 to paragraph (g)(3): HG mod 20-040, as referenced in paragraphs (g)(3), and (h)(1) and (2) of this AD, is accomplished after installation of MRH P/N G12-00-103 and swashplate guide P/N G21-01-103 containing scissor fitting P/N G12-00-202.
(4) Completing the actions required by paragraph (g)(3) of this AD constitutes a terminating action for the requirements in paragraphs (g)(1) and (2) of this AD.
(1) For any pre-HG mod 20-040 helicopter: As of February 22, 2021 (the effective date of AD 2021-02-20), do not install an MRH or swashplate guide, with rotating or non-rotating scissor fitting P/N G12-00-200 installed, respectively, on any helicopter, even if new, unless the actions required by paragraph (g)(1) of this AD have been accomplished.
(2) For any post-HG mod 20-040 helicopter: As of the effective date of this AD, do not install an MRH or swashplate guide, with rotating or non-rotating scissor fitting P/N G12-00-200 installed, respectively, on any helicopter.
