The iron and sulphur still behave like iron and sulphur in the mixture, but iron sulphide has different properties from both iron and sulphur. You can separate the iron from the mixture using a magnet but this does not work for iron sulphide. 1  Page.
Search for: An Airworthiness Directive (A.D.) is a directive issued when the FAA realizes that a perilous condition exists in a product (aircraft engine, airframe, appliance or propeller). They notify aircraft operators and owners of potentially unsafe conditions that need special inspections, alterations, or repairs.
In accordance with (IAW) AFMC. Mission Directive (AFMCMD) 401, Headquarters Air Force Materiel Command, it identifies. elements of systems engineering (SE) practices and management required to provide and sustain. cost-effective products and systems that are operationally safe, suitable and effective.