Diamond airplanes must fix their doors after they kept flying open mid-flight

The US aviation regulator proposes new rules for Diamond DA 40, DA 40 F, and DA 40 NG airplanes. This means owners must inspect and potentially repair passenger door latching mechanisms and update flight manuals.

This is a direct response to a serious safety issue: airplane doors separating during flight. It means that a specific manufacturer, Diamond Aircraft Industries, must now ensure its planes meet a higher safety standard for door integrity. This will likely increase maintenance costs for owners and operators of these models.