Airworthiness Directives; Airbus Helicopters Deutschland GmbH

We propose to adopt a new airworthiness directive (AD) for Airbus Helicopters Deutschland GmbH (Airbus Helicopters) Model MBB-BK 117 C-2 and MBB-BK 117 D-2 helicopters. This proposed AD would require repetitive visual inspections and a one-time torque of each hydraulic module plate assembly attachment point (attachment point). This proposed AD is prompted by a design reassessment showing the current attachment point design is insufficient in preventing an attachment point failure. The proposed actions are intended to prevent failure of an attachment point, loss of the hydraulic module plate, and subsequent loss of control of the helicopter.