Boeing doesnt know who removed, reinstalled part that blew off Alaska Airlines jet [Video]

Seven months of investigations. Nearly 10 hours of hearings. And yet neither Boeing nor the National Transportation Safety Board know how a 737 Max was delivered to Alaska Airlines without the four bolts needed to keep a door plug in place.What is known: Boeing’s procedures and training – by employees, and by safety investigators – have drawn enormous skepticism and criticism from regulators. That was on full display in the first day of a two-day hearing. The NTSB called a rare public hearing to examine the near tragedy on the Jan. 5 Alaska Air flight in which a door plug blew out, leaving a gaping hole in the side of the plane – and in Boeing’s already battered reputation.The door plug was removed at the Boeing factory in Renton, Washington, last September so that problems with some rivets could be repaired. But the necessary paperwork for that temporary door plug …