Airworthiness Directive · Amendment 39-21722 · Rotorcraft flight control
Hélicoptères Guimbal Helicopters
This AD applies to Hélicoptères 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 HG22-1001 or HG modification 16-009.
The FAA is adopting a new airworthiness directive (AD) for H[eacute]licopt[egrave]res 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 part- numbered 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.
(1) Within 50 hours time-in-service (TIS) or 2 months, whichever occurs first after the effective date of this AD:
(i) Disconnect the bellcrank from the swashplate guide by removing each bolt and, ensuring that the bellcrank remains attached to the flight control rod, remove each metal bushing from service using a bushing disassembly tool.
(ii) Visually inspect the lug bore area for any corrosion and any cracks. If there is any corrosion or any cracks, before further flight, remove the swashplate guide from service or repair it using an FAA-approved method. If there is no corrosion and no cracks, install plastic bushing part number HG22-1001, coat plastic bushing with isolation compound, re-install the bellcrank, torque each bolt to 7.5 Nm-9 Nm (5.5 ft-lbs-6.6 ft-lbs), and install cotter pins.
(2) As of the effective date of this AD, do not install any metal bushing on any helicopter.
