Summary
We propose to supersede an existing airworthiness directive (AD) for ECD Model MBB-BK 117 C-2 helicopters. This proposed AD results from a mandatory continuing airworthiness information (MCAI) AD issued by the European Aviation Safety Agency (EASA), which is the Technical Agent for the Member States of the European Community. The MCAI AD states there was an in-flight incident in which a dynamic weight broke off the control lever leading to considerable vibrations. A visual inspection revealed that the threaded bolt of the control lever had broken off. The proposed actions are intended to prevent separation of dynamic weights, severe vibration, and subsequent loss of control of the helicopter.