AD FAA-2020-1133

The FAA is adopting a new airworthiness directive (AD) for all ATR--GIE Avions de Transport R[eacute]gional Model ATR42-500 and ATR72 airplanes. This AD was prompted by a report of damage found on a wire bundle connecting an angle-of-attack (AOA) probe and a multi-function computer (MFC), which can inhibit activation of the stick pusher without any indication to the flight crew by the stall warning system. This AD requires a repetitive operational test for discrepancies of the stall warning system and stick pusher in the flight configuration, an inspection for discrepancies in the wiring bundles between AOA probes and MFCs, and corrective action if necessary, as specified in a European Union Aviation Safety Agency (EASA) AD, which is incorporated by reference. The FAA is issuing this AD to address the unsafe condition on these products.