https://phys.org/news/2019-03-ethiopian-airline-defends-standards.html

He said in a statement the pilots were also made aware of an emergency directive issued by the U.S. regulator, the FAA, following the crash of a Boeing 737 Max 8 owned by Indonesia's Lion Air in October.

As investigators look into the crashes, attention has turned to a new software in the jets that can push their nose down in some circumstances, for example when the sensors suggest the plane may be stalling.