Federal Aviation Administration December 17, 2020 – Federal Register Recent Federal Regulation Documents

The FAA is adopting a new airworthiness directive (AD) for all ATRGIE 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.

The FAA proposes to supersede Airworthiness Directive (AD) 2017-19-25, which applies to all Airbus Defense and Space S.A. Model CN-235, CN-235-100, CN-235-200, and CN-235-300 airplanes; and Model C- 295 airplanes. AD 2017-19-25 requires repetitive inspections and operational checks of the affected fuel valves, and corrective actions if necessary. Since the FAA issued AD 2017-19-25, it has been determined that it is necessary to limit the installation of affected parts specified in AD 2017-19-25 to those parts that are maintained in accordance with certain instructions. This proposed AD would continue to require repetitive inspections and operational checks of the affected fuel valves, and corrective actions if necessary. This proposed AD would also limit the installation of affected parts to those that that are maintained in accordance with certain instructions, as specified in a European Union Aviation Safety Agency (EASA), which will be incorporated by reference. The FAA is proposing this AD to address the unsafe condition on these products.

These special conditions are issued for the Boeing Commercial Airplanes (Boeing) Model 777-9 airplane. This airplane will have a novel or unusual design feature when compared to the state of technology envisioned in the airworthiness standards for transport- category airplanes. This design feature is an overhead flightcrew rest (OFCR) compartment occupiable during taxi, takeoff, and landing (TT&L). The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. These special conditions contain the additional safety standards that the Administrator considers necessary to establish a level of safety equivalent to that established by the existing airworthiness standards.