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 609. Technicians who service motor vehicle air conditioning must be certified. Servicing motor vehicle air conditioning includes repairs, leak testing, and topping off of air conditioning systems low on refrigerant as well as any other repair to the vehicle which requires dismantling any part of the air conditioner. The Section 609 Motor Vehicle Air Conditioning Exam is an open book test.