BERLIN, Germany (AP) — Europe’s flight safety authority said Friday the first flight tests for the Boeing 737 Max, which has been grounded worldwide after two deadly crashes revealed design issues with the jet, have now been completed.

The test flights conducted over the past week by the European Aviation Safety Agency (EASA) took place in Vancouver, Canada, because of travel restrictions due to the novel coronavirus and are now complete, the agency said.

“As the next step in its evaluation of the aircraft for return to service, EASA is now analysing the data and other information gathered during the flights,” the agency said.

The data will then be turned over to EASA’s joint operations evaluation board, which is scheduled to start its assessment next week in London.

EASA emphasised it has been working with the US Federal Aviation Administration (FAA), which began its own recertification test flights in June, and Boeing “to return the Boeing 737 Max aircraft to service as soon as possible, but only once we are convinced it is safe”.

Airlines began using the Max in 2017. There were nearly 400 in service when the planes were grounded after a 2018 crash in Indonesia and a 2019 crash in Ethiopia. Investigators have pointed to the role played by flight-control software called MCAS that pushed the noses of the planes down based on faulty sensor readings.

Last month, the FAA outlined a list of design changes required before it would lift its order grounding the aircraft.