The Federal Aviation Authority said the aircraft would remain grounded until data from the inspected aircraft had been reviewed.
It said: “All 737-9 Max aircraft with door plugs will remain grounded pending the FAA’s review and final approval of an inspection and maintenance process that satisfies all FAA safety requirements.
“Once the FAA approves an inspection and maintenance process, it will be required on every grounded 737-9 Max prior to future operation.
“The safety of the flying public, not speed, will determine the timeline for returning these aircraft to service.”
The Alaska Airlines 737 was only two months old, and the FAA is probing Boeing’s manufacturing processes. The type is also used by United Airlines, Turkish Airlines and Icelandair.
“The FAA is now investigating Boeing’s manufacturing practices and production lines, including those involving subcontractor Spirit AeroSystems, bolstering its oversight of Boeing, and examining potential system change,” it added.
