(Reuters) - The National Transportation Safety Board plans to conduct a safety culture survey of employees at Boeing's ( BA ) 737 MAX factory in Renton, Washington, the board's chair said on Wednesday.

NTSB Chair Jennifer Homendy disclosed the plan at a hearing after criticizing the planemaker's prior safety efforts before a January 737 MAX mid-air emergency and Boeing's ( BA ) failure to prevent unauthorized or undocumented work at the 737 factory. Boeing ( BA ) executive Paul Wright said at the hearing that the planemaker would commit to work with the NTSB to carry out the board's survey without interference.