Worldwide catastrophic fatigue-related aircraft accidents for aircraft types on the canadian civil register

The International Civil Aviation Organization (ICAO) has issued guidance material (Reference 1) for use in assessing and maintaining the airworthiness of aeroplanes. This guidance material provides a technical basis for a continuing aasessment of structural integrity and emphasizes the necessity of additional inspections for aging aircraft. In particu1ar, a Supplementary Inspection Document (SID) is recommended that would include information to ensure that the structural integrity provided by damage tolerant or safe-life design features are maintained over the life of the aircraft. Several civil airworthiness authorities have adopted a position simHar to that expressed by ICAO, and have issued directives to implement the policy. The Canadian Hinistry of Transport is reviewing the best method of applying similiar aupplementary inapection requirements to Canadian Civil Aircraft. Because of the large proportion of small commercial and business operators in Canada, attention is also being focused on aircraft smaller than have been generally considered by other authorities.