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.
1. GENERAL. Networthiness is the result of an operational assessment of IT to verify compliance with security, interoperability, supportability, sustainability, and usability regulations, guidelines, and policies as issued by Federal, DoD, and Combatant Command! Service!Agency Components. Consistent Networthiness assessment of IT connecting to DoD