The EASA and FAA have issued new emergency Airworthiness Directives (ADs) for the Eurocopter EC135 after detection of cracks on the lower hub-shaft flange of two more of the light twins. The ADs require repetitive preflight inspections.
The FAA is proposing an airworthiness directive for variants of the Bombardier Challenger 600 and 601. There have been several reported incidents of jamming/malfunctioning of the left-hand engine thrust control mechanism on the affected airplanes.
The FAA proposed an Airworthiness Directive for the Eurocopter SA365N, SA365N1, AS365N2, AS365N3, EC155B, EC155B1, SA365C, SA365C1, SA365C2 and SA366G1. It is prompted by reports of corrosion on the main gearbox (MGB) casing lower area between the two servo-control anchor-fitting attachment ribs. The proposed actions are to detect corrosion on the MGB casing, which could lead to a crack, failure of the MGB and subsequent loss of control. The FAA is accepting comments until August 17.
The FAA is proposing an airworthiness directive for the Bell Helicopter 412, 412EP and 412CF. It is the result of a reported failure of a collective lever. The proposed actions are intended to detect a crack in the collective lever, which could lead to failure of the collective lever and subsequent loss of control of the helicopter. The FAA is taking comments on the proposed AD until July 23.
The FAA has issued an airworthiness directive for all Honeywell ALF502L-2C; ALF502R-3; ALF502R-3A; ALF502R-5; LF507-1F; and LF507-1H turbofans. The AD was prompted by two reports of engines experiencing uncontained release of low-pressure (LP) turbine blades. The AD requires operational checks of the engine overspeed trip system to prevent LP turbine overspeed, which could lead to uncontained release of the LP turbine blades and damage to the airplane.
The Bell 427 is the subject of a new FAA airworthiness directive requiring replacement of certain tailboom attachment hardware and at certain intervals determining the torque of the attachment hardware. It was prompted by a review of the tailboom attachment installation that revealed the torque value of the bolts specified in the maintenance manual, and applied during manufacturing, was incorrect and exceeded the recommended torque range.
Avtrak has announced a new reporting feature for its GlobalNet maintenance tracking system designed to meet Mexican DGAC compliance requirements. Similar to most documentation in aviation, the GlobalNet system is in English; however, Mexico’s DGAC requires the format of an operator’s airworthiness directive and service bulletin reports to be in Spanish.
The FAA is proposing an airworthiness directive for the Agusta A109E and A109S based on cases of damage to the main drive shaft caused by improperly secured metallic spacers. The AD would require a one-time inspection of the lower semichannel assemblies to determine proper installation of the metallic spacers on the semichannels and for the correct seating of the gaskets. The FAA is taking comments until July 23.
The FAA issued a second Emergency Airworthiness Directive [2012-10-53] for the Eurocopter EC135 on May 18. This EAD supercedes the earlier EAD [2012-10-51] for an inspection of the main rotor hub shaft flange for cracks.
The EASA has issued a new emergency Airworthiness Directive (AD) after further cracks were detected on the lower hub-shaft flange of two other Eurocopter EC135 light-twin helicopters. Repetitive preflight inspections are required and different from those described in a first emergency AD, issued in March. The initial inspections proved insufficient. The investigation is ongoing.