Airworthiness Directives; Short Brothers Model SD3-60 SHERPA and SD3 SHERPA Series Airplanes

This amendment adopts a new airworthiness directive (AD), applicable to all Short Brothers Model SD3-60 SHERPA and SD3 SHERPA series airplanes, that requires removing the aluminum alloy oxygen pipe assembly and replacing it with a stainless steel assembly. This amendment is prompted by the issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent aluminum oxygen tubing from bursting and releasing a high- pressure oxygen flow into the passenger cabin, which could result in a fire hazard during flight.