These special conditions are issued for the ATR-GIE Avions de Transport R[eacute]gional (ATR) Model ATR42-500 and ATR72-212A airplanes. These airplanes 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 the installation of a digital system that contains a wireless and hardwired network with hosted application functionality that allows access, from sources internal to the airplane, to the airplane's internal electronic components. 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.

This document announces the availability of ASTM International (ASTM) consensus standards for use as an FAA-accepted means of compliance (MOC) to support issuance of special airworthiness certificates for the categories of light-sport category aircraft and light-sport category kit-built aircraft described herein. The FAA accepts the following ASTM standards (with changes identified in this document): F3815-26a, "Standard Specification for Integration for Light Sport Airplane," F3836-26, "Standard Specification for Integration for Light Sport Glider," F3840-26,\1\ "Standard Specification for Integration for Light Sport Powered-Lift and Multicopter," and F3841-26, "Standard Specification for Integration for Light Sport Gyroplane". FAA's acceptance of these ASTM integration standards as an MOC includes FAA's acceptance of the underlying ASTM functional standards as set forth Tables 1-8 herein. The FAA will maintain a listing of FAA accepted MOCs for light-sport category aircraft on the FAA's Light-Sport Category Aircraft web page at https:/ /www.faa.gov/aircraft/gen_av/light_sport. ---------------------------------------------------------------------------

The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 707, 717, and 727 airplanes; Model DC-8, DC-9, and DC-10 airplanes; Model MD-10 and MD-11 airplanes; Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and MD-88 airplanes; and Model MD 90-30 airplanes. This AD was prompted by the determination that radio altimeters cannot be relied upon to perform their intended function if they experience interference from wireless broadband operations in the 3.7-3.98 GHz frequency band (5G Lower C- Band) while operating in Canadian airspace, and the determination that during approach, landings, and go-arounds, as a result of this interference, certain airplane systems may not properly function, resulting in increased flightcrew workload while on approach with the flight director, autothrottle, or autopilot engaged, which could result in reduced ability of the flightcrew to maintain safe flight and landing of the airplane. This AD requires revising the existing airplane flight manual (AFM) to incorporate limitations prohibiting certain operations requiring radio altimeter data when operating in Canadian airspace. The FAA is issuing this AD to address the unsafe condition on these products.