Members of the main U.S. transportation regulator grilled Boeing executives Wednesday over the company’s workplace safety culture and allegations of retaliation linked to two employees who were sidelined over a January mishap involving a Boeing 737 Max 9 in which a door plug detached mid-flight. A preliminary report found that four bolts intended to secure the door plug had been missing when the accident occurred. The workers were placed in a different building where Boeing builds wings, which the NTSB said in a report workers refer to as “Boeing prison,” Homendy said at Tuesday’s hearing. Boeing is working on plug sensor changes that will not allow the door plug to fully close if there are any issues until it is firmly secured. Boeing committed under oath to work with the NTSB without interference on a safety culture survey of Boeing employees.

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Persons: Jennifer Homendy, Hector Silva, ” Homendy, ‘, ” Silva, “, Silva, Sabrina Woods, “ Bolts, ” Woods, Boeing execs, Homendy, you’re, Elizabeth Lund, Boeing’s, Lund, Kelly Ortberg Organizations: Boeing, National Transportation Safety Board, ‘ Boeing, Alaska Airlines Locations: U.S, Portland , Oregon, Ontario , California, Boeing’s Renton , Washington