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.
For example, the findings of the initial safety oversight audit conducted by ICAO. relating to Annex 1â Personnel Licensing, Annex 6 â Operation of Aircraft and Annex 8 â Airworthiness. of Aircraft, indicated that of the 181 Contracting States that were audited between March 1999 and.