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.
export certifications will result in the issuance of an export certificate of airworthiness FAA Form 8130-4. When issued, it shows that an aircraft meets a specific airworthiness standard before being exported to a foreign country. export certifications will result in the issuance of an FAA Form 8130-3.When issued, it shows that an engine, propeller, or other aviation article meets the airworthiness standards for export to a foreign country.xport certifications will result in the issuance of an export certificate of airworthiness FAA Form 8130-4. When issued, it shows that an aircraft meets a specific airworthiness standard before being exported to a foreign country. export certifications will result in the issuance of an FAA Form 8130-3.