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.
Meet performance levels for climate control and refrigeration products. Air-Conditioning, Heating and Refrigeration Institute (AHRI) standards are used worldwide to verify manufacturersâ performance claims, enabling fair product comparisons across various manufacturers. These documents direct product design and manufacturing as well as specification for product type during procurement.