The ASC's occurrence investigation process includes factual data phase (on-scene investigation, evidence collection, documentation and pertinent facts identification), analyses phase (drawing conclusions, proposing safety recommendations, drafting the Final Report) and Final Report phase( parties' review and comments of the draft Final Report, comments review and approving process of the draft Final Report by the Council Meeting, if required, hearing and reviewing the stated comments from of parties, and the Final Report publishing). In general, the ASC needs to take about one year to complete an occurrence investigation. As for the major aviation occurrence, the ASC may take nearly two years to complete it.

        According to occurrences statistics to year 2014, the ASC has investigated or joined investigation over 103 occurrence investigations since it established in 1998. An average is about 6 to 7 investigations per year, therefore the investigation works almost consume all the ASC investigators' working time around the year.