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.
No. The air conditioning and refrigeration technician registration is required for an individual who performs air conditioning and refrigeration maintenance work for a licensed air conditioning contractor.egistration is required for air conditioning technicians who work under a licensed air conditioning and refrigeration contractor and who performs air conditioning and refrigeration maintenance work. Certification is optional.