“Major safety concerns” raised by Chinese regulators “have not been fully resolved,” said
Design changes must pass approval for airworthiness, pilots must receive “effective flight training” and conclusions of investigations into the two crashes must be clear, Dong said.
“The technical review has not yet entered the certification and flight test stage," Dong said. He gave no timeline for when that might happen.
Crash investigators blamed anti-stall software that countered the plane’s tendency to tilt nose-up because of the size and placement of the engines. That software pushed the nose down repeatedly, overcoming the pilots’ struggles to regain control. In each case, a single faulty sensor triggered the nose-down pitch.
The new software now requires inputs from two sensors to activate the software, which
Chinese airlines own about 100 737 Maxes, according to news reports.
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