The Federal Aviation Administration said that Boeing’s instructions for how airlines should check the planes were insufficient and that the company would revise them.
Bob Sauer said that his 50-foot cedar trees had acted on the same scientific principle as an airbag, disrupting the door plug’s fall in an act known in physics as impulse.
Boeing and the Federal Aviation Administration issued technical instructions to airlines two days after a part of a plane was blown out near Portland, Ore.