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.