Summary
The FAA proposes to adopt a new airworthiness directive (AD) for Airbus Helicopters Deutschland GmbH Model MBB-BK117 A-1, MBB-BK117 A-3, MBB-BK117 A-4, MBB-BK117 B-1, MBB-BK117 B-2, MBB-BK117 C-1, and MBB-BK117 C-2 helicopters. This proposed AD would require inspecting the tail gearbox (TGB) bellcrank attachment arm (arm) for a crack. This proposed AD was prompted by a report of a cracked TGB arm. The actions of this proposed AD are intended to address an unsafe condition on these products.