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.
By Order of the Secretary of the Air Force, this is an AF Guidance Memorandum. immediately implementing changes to AFI 90-802. This AFGM implements tiering/waiver status. for the affected paragraphs. To the extent its directions are inconsistent with other Air Force.