China’s Civil Aviation Administration (CAAC) has conducted a comprehensive and in – depth technical investigation into the Boeing 737 Max, CAAC CEO Dong Ji said, giving the position of controller on the plane that landed in China in early 2019.

“Once major security concerns are resolved, we will gradually conduct air tests and reconsider,” Dong said, adding that cooperation with the FAA and Boeing was positive. China became the first country to land the 737 MAX in March 2019, after two fatal accidents. A quarter of Max Orders is in China.

The CAAC outlines three policies for the withdrawal of the 737-MAX, including certified design changes, proper pilot training and specific findings from accidents. The US Federal Aviation Administration (FAA) lifted the ban on flights in January. This was followed by the European Aviation Security Agency (ISA) and several agencies. Australia said on Friday it would lift Max’s ban.