Boeing CEO Dave Calhoun is testifying before the the Senate Homeland Security Subcommittee at 2 p.m. on Capitol Hill.

The hearing will focus on “Boeing’s Broken Safety Culture,” which follows an April session of the Senate Permanent Subcommittee on Investigations, during which a Boeing engineer testified that he was punished for questioning the safety of the 787 Dreamliner and 777. Last week, Boeing disclosed some of the fasteners on the fuselages of their 787 Dreamliner fleet may have been improperly installed.

“Five years ago, Boeing made a promise to overhaul its safety practices and culture,” Sen. Richard Blumenthal (D-CT) said earlier this month. “That promise proved empty, and the American people deserve an explanation.”

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“Years of putting profits ahead of safety, stock price ahead of quality, and production speed ahead of responsibility has brought Boeing to this moment of reckoning, and its hollow promises can no longer stand,” he continued.

In recent months, Boeing has experienced a string of problems, with many flights being diverted or forced to land shortly after takeoff due to problems mid-air. Boeing’s problems started in January when the door plug blew off an Alaska Airlines plane mid-flight.