Under rules overseen by the United Nations' Montreal-based aviation agency, ICAO, Ethiopia must issue a preliminary report within 30 days of the disaster, meaning the deadline is April 9. The rules governing aircraft accident investigations are known throughout the industry by their legal name "Annex 13". ICAO does not participate in accident investigations unless it receives a special request from the country in charge. It is not participating in investigations on Ethiopian Airlines and a separate Lion Air crash last October involving the 737 MAX. It cannot impose binding rules on governments, but wields clout through its safety and security standards which are approved by its 192 member countries.

Source: Ethiopian News April 01, 2019 11:48 UTC