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August 7, 2019 - by for Alex Davies for wired.com

IN THE NEARLY five months since the Federal Aviation Administration grounded Boeing's 737 MAX, investigators have revealed a series of issues with the jet's software and raised questions about how the planemaker and the regulator allowed it to take off in the first place.

The timeline for returning the MAX to passenger service remains murky, but that doesn't mean it can't fly at all.

Monday morning, a Boeing-owned 737 MAX 7 took off from King County International Airport-Boeing Field near Seattle, climbing to 24,000 feet as it headed west to the Pacific Ocean, then due south.

Over the next few minutes, according to tracking service FlightRadar24, the plane shed altitude and speed, until it was flying at about 13,000 feet and a lazy 250 mph, about 50 miles off the Oregon coast.

For the next two hours, the MAX slowed as it climbed, then sped up as it dropped, cycling between the two more than a dozen times. Its altitude fluctuated between 10,000 and 14,000 feet, its speed between 150 and 300 mph...

Read more https://www.wired.com/story/boeing-737-max-test-flight-ups-and-downs/