US safety board plans to quiz officials about FAA oversight of Boeing before a panel blew off a 737

abcnews.go.com:

Officials from Boeing and the Federal Aviation Administration are facing questions about the door plug that blew off a 737 Max jetliner in midflight

WASHINGTON — A federal safety board planned on Wednesday to probe the Federal Aviation Administration's oversight of Boeing and how it has changed since a door plug blew off a Boeing 737 Max in midflight.

The National Transportation Safety Board is holding a two-day hearing on the blowout during an Alaska Airlines flight in January.

Door plugs are installed on some 737s to seal a cutout left for an extra exit that was not required on the Alaska jet. The plug on the Alaska plane was opened at a Boeing factory to let workers fix damaged rivets, but bolts that help secure the panel were not replaced when the plug was closed.

A Boeing official said Tuesday that the company is redesigning door plugs so they cannot be closed until they are properly secured. Elizabeth Lund, who was named Boeing's senior vice president of quality shortly after the blowout, said the company hopes to complete the fix within about a year, and that 737s already in service will be retrofitted.

On Wednesday, representatives from Boeing and key supplier Spirit AeroSystems described their “safety management systems,” which encourage employees to report safety concerns. Boeing officials praised their “Speak Up” program for reporting concerns about quality and safety.

However, the president of the machinists' union local said Boeing often ignores safety concerns raised by the union until he lodges a complaint with federal regulators.

“It really sounds great,” the official, Lloyd Catlin, said of Boeing's safety plan. «In action on the factory floor, it is not.”

Later on Wednesday, NTSB members planned to