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.
EPA Section 608 Certification. One of the U.S. Environmental Protection Agencyâs many duties is to oversee programs that protect the stratospheric ozone layer. Section 608 of the Clean Air Act enforces activities that protect the ozone layer as they apply to stationary refrigeration and air conditioning systems. Under this program, certification is required to ensure that technicians measure up to a variety of EPA requirements on service practices and refrigerant reclamation.