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A Boeing 737 Max airplane lands after a test flight at Boeing Field, in Seattle, Wash., on June 29, 2020.Karen Ducey/Reuters

China’s aviation authority on Thursday issued an airworthiness directive on the Boeing Co 737 Max that will help pave the way for the model’s return to service in China after more than two and a half years.

The directive instructs airline operators on the revisions required before the Max returns to service, although it does not specify when China will lift a ban on the Max in its airspace.

Boeing described the directive as an “important milestone” toward the return of service in China and its shares jumped 4.3 per cent on the news in pre-market trading, on track to break a four-day losing streak after the market was hit by concerns about the Omicron coronavirus variant.

The Civil Aviation Administration of China (CAAC), which was the first regulator globally to ground the Max in March 2019 after two deadly crashes, said it had completed a review of the design changes proposed by Boeing.

“After conducting sufficient assessment, CAAC considers the corrective actions are adequate to address this unsafe condition,” the regulator said in a statement on its website.

“The CAAC’s decision is an important milestone toward safely returning the 737 Max to service in China,” Boeing said on Thursday. “Boeing continues to work with regulators and our customers to return the airplane to service worldwide.”

The CAAC did not immediately respond to a Reuters request for comment on the next steps required before the Max returned to service. The regulator had sought industry feedback last month before issuing the airworthiness directive.

It has previously outlined three principles for the jet to return to service in China, including certified design changes, proper training for pilots and specific and definitive findings into the two crashes.

Boeing CEO David Calhoun said in October the company was working toward gaining Chinese approvals by the end of the year for the 737 Max to fly, with deliveries expected to resume in the first quarter of 2022.

Around a third of about 370 undelivered 737 Max airplanes in storage are for Chinese customers, Boeing said at the time.

China’s authorization of the 737 Max is very good news, which will support the drawdown of undelivered Max inventory, Safran CEO Olivier Andries told reporters on Thursday.

Safran makes Max engines as part of the CFM International joint venture with GE.

Before the 737 Max was grounded, Boeing was selling one-quarter of the planes it built annually to Chinese buyers, its largest customers.

Beyond safety concerns, Boeing’s sales in China have been hobbled by U.S.-China trade tensions, with Washington accusing Beijing of blocking purchases of Boeing planes by its domestic airlines.

Other Asia-Pacific countries – including Singapore, Malaysia, India, Japan, Australia and Fiji – have already approved the return of the 737 Max.

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