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.
This instruction implements Air Force Policy Directive (AFPD)10-12, Space, AFPD16-7, Special Access Programs, Air Force Mission Directive (AFMD)5, Air Force Space Command, and Air Force Instruction (AFI)10-1201, Space Operations to provide guidance for the Air Force. Space Command (AFSPC) Weapons and Tactics (W&T) Program by amplifying guidance. contained in AFI11-415, Weapons and Tactics Programs.