@CCTV International News: According to the New York Times on March 11th local time, the Federal Aviation Administration of the United States found that Boeing had "many quality control issues" after a six-week audit. Out of all 89 audits, Boeing passed 56 and 33 failed, accounting for over 37% of the total. A total of 97 possible non compliant situations were identified.
The Federal Aviation Administration of the United States also conducted 13 product audits on the supplier of fuselage components for Boeing 737 MAX series aircraft, Airborne Systems, with 7 of them failing. One audit related to door plug installation and the other audit related to door plug components identified 5 issues.
On January 13th, the Federal Aviation Administration of the United States announced an audit of the manufacturing of Boeing 737 MAX series aircraft. The trigger for this action was a door stopper (embedded emergency hatch) that fell off during the flight of a Boeing 737 MAX 9 aircraft operated by Alaska Airlines on January 5th. This plane made an emergency landing without causing any casualties. After inspection by investigators, it was found that four bolts that were supposed to fix the door plug in place were missing.