Another Boeing whistleblower speaks out as CEO to testify before Congress

Sam Mohawk alleges he was told to conceal evidence from regulators while Dave Calhoun will face senators' questions

Another Boeing whistleblower has come forward, accusing the embattled planemaker of cutting corners on its production line hours before its CEO testifies before Congress.

Sam Mohawk, a quality assurance inspector for the company in Renton, Washington, alleged that he was instructed by his supervisors to conceal evidence from regulators.