Prompted by two incidents of mis-routed fire extinguisher wires, the FAA has issued an Airworthiness Directive [AD 2012-08-16] for several Learjet 60 models.The AD requires the inspection of electrical leads routed to the fire extinguishing containers for proper identification and to ensure the electrical leads are connected to the correct squibs.
The FAA has issued an Airworthiness Directive for the Bell 206L, 206L-1, 206L-3 and 206L-4 prompted by two accidents in which investigations revealed a main rotor blade failed because of fatigue cracking. Transport Canada advises there is no reliable inspection method to detect the cracks before blade failure and has reduced the life limit from 3,600 to 1,400 hours’ time-in-service.
The FAA has issued what could be an expensive tail-boom inspection airworthiness directive for the more than 100 Eurocopter EC130B4s in service in the U.S., most of them with air-tour operators. The AD mandates inspections for cracks in the region where the tail boom meets the fenestron assembly. If cracks are found the boom must be replaced at an estimated cost of $64,250 per helicopter.
The FAA is adopting a new airworthiness directive for all Agusta A109S and AW109SP helicopters. A fatigue crack found in the left elevator assembly along the riveting of the upper skin to the fourth rib on an Agusta A109S prompted the AD. The airworthiness directive requirements are designed to detect a crack that could lead to a failure of the elevator, reduced maneuverability of the helicopter, and subsequent loss of control of the helicopter.
The FAA has issued an NPRM for an Airworthiness Directive targeting the Learjet 60 fire extinguishing system. It is prompted by two incidents of swapped fire-extinguishing wires and would require inspecting the electrical leads routed to the fire-extinguishing containers for proper identification and missing labels; to ensure the electrical leads are connected to the correct squibs; and corrective actions if necessary.
The FAA has issued a final rule on an airworthiness directive for the Eurocopter EC 120B. It requires modifying the pilot cyclic control friction device by replacing a specified thrust washer with two thrust washers.
The FAA has issued an Airworthiness Directive for the Socata TBM 700 electrical system.
The FAA proposes to issue an airworthiness directive for certain variants of the Bombardier CL-600, 601 and 604.