The following independent safety investigation authorities (SIA) are members of ITSA:
- Australia – Australian Transport Safety Bureau (ATSB)
- Canada – Transportation Safety Board of Canada (TSB)
- Finland – Safety Investigation Authority (SIA)
- France – Bureau d’Enquêtes et d’Analyses pour la sécurité de l’aviation civile (BEA)
- India – Commission of Railway Safety (CRS)
- Japan – Japan Transport Safety Board (JTSB)
- Republic of Korea – Aviation and Railway Accident Investigation Board (ARAIB)
- Papua New Guinea – Papua New Guinea Acc. Invest. Comm. (AIC)
- The Netherlands – Dutch Safety Board (DSB)
- New Zealand – Transport Accident Investigation Commisssion (TAIC)
- Norway – Accident Investigation Board Norway (AIBN)
- Commonwealth of Independent States (former Soviet republics) – Interstate Aviation Committee (IAC)
- Singapore — Transport Safety Investigation Bureau of Singapore(AAIB)
- Sweden – Swedish Accident Investigation Authority (Statens haverikommission SHK)
- Chinese Taipei – Taiwan Transportation Safety Board (TTSB)
- United Kingdom – Board of Transport Accident Investigators (BTAI), representing:
- United States – National Transportation Safety Board (NTSB)
The following qualifications shall be the primary considerations for new admission to ITSA membership:
- The SIA is organized as a permanent entity, separate from any regulatory body.
- The legal basis for the functioning of the SIA is to be found in statutory law, such as in an act of parliament, a government regulation or similar legislative document.
- The SIA enjoys a budget of its own and it does not have to rely on financial contributions on a case by case basis from any other body, including any branch of government.
- The budgetary means of the SIA shall be sufficient to allow it to have its own office space, some permanently employed qualified staff, and other necessary resources.
- The task of the SIA shall be of a clearly non-judicial nature and shall have as its sole purpose to promote safety.
- Under no circumstances shall the investigations or reports of the SIA focus on issues of guilt, blame or liability.
- The SIA shall have no role in approving or warranting components of a transportation system as safe for use.
- The SIA is empowered to decide at its own discretion what occurrences to investigate, unless statutory law specifies such criteria.
- The SIA shall have the powers necessary to initiate and fully carry out a safety investigation independently and separately from any other form of investigation into the same occurrence.
- The SIA shall have the right to freely publish investigation reports, including any conclusions and safety recommendations it deems relevant, without the need for consent from any other body, including any branch of government.
- The SIA is recognized by its peers as a world leader in its field as demonstrated through the successful completion of major investigations involving multiple countries, the implementation of recommendations that result in major safety improvements in multiple countries, and/or the development of new investigation tools and techniques adopted by other countries.
An independent government transport safety investigation authority that fulfill the membership criteria and would like to become a member of ITSA, should contact the ITSA Secretariat.