After reviewing Boeing’s proposed inspection and maintenance instructions, the FAA determined it needed additional data before approving them. Accordingly, the FAA is requiring plug-door inspections of 40 aircraft.

The FAA is encouraged by the exhaustive nature of Boeing’s instructions for inspections and maintenance. However, in the interest of maintaining the highest standard of safety the agency will not approve the inspection and maintenance process until it reviews data from the initial round of 40 inspections.