Considering that the aircraft faces uncertainties in its airwo

irworthiness, after looking into the matter, the administration decided to suspend Boe

ing 737 MAX 8 airworthiness certifications immediately,” the Civil Aviation Administration of China said in a sta

tement unveiled on Tuesday, adding that the ongoing investigation had not ruled out design flaws in the aircraft.

“A certificate is granted by the country’s regulator after an aircraft has been inspected and

meets the requirements for safe operation,” said Li Xiaojin, a professor of aviation economics at Civil Aviatio

n University in Tianjin, “It’s a long process to determine whether an aircraft is airworthy.”

It took Boeing 15 months to get an airworthiness certificate for the first 737 MAX 8 from the a

dministration, he said, adding that the certificate was issued in October 2017.

The administration has sent experts to participate in investigations and will rev

iew the model’s airworthiness with a focus on alterations to the jet engine design and pla

cement. It will resume accepting applications for the certificate after the aircraft design is found to meet the requirements.

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