According to CASA definition, all aircrafts are aged even from their date of birth, so aging problem of aircrafts appear from the beginning of their early life and continuous aging operation must get preformed to secure their safety. Moreover of aging aircraft definition, Sahay said Boeing definition of an aircraft is: “Thousands of components and multiple engines,fitted to an airframe, flying in unison; which need to be
maintained using ground support equipment so that the aircraft can fly again and again till it is retired or in some unfortunate circumstances rendered incapable of flying [1].”Therefore, all aircrafts need to be maintained and repaired.