The FAA has issued a new airworthiness directive for specific models of Airbus Helicopters Deutschland GmbH, including EC135 and its variants. This directive requires operators to remove certain Titanium (Ti) bolts, identified by specific part numbers and markings, from service and ban their installation on the forward tail rotor drive shaft. These actions were prompted by safety concerns following a report of a broken Ti-bolt, which could lead to reduced control of the helicopter. The rule is effective as of March 29, 2021, and aims to prevent possible helicopter control issues linked to these Ti-bolts.
Simple Explanation
The FAA is telling people who fly certain Airbus helicopters to stop using a specific type of screw in a part of the helicopter because one of those screws broke and it could make flying the helicopter dangerous.