Aerospace giant Boeing will pay a $51 million civil penalty to the State Department to resolve alleged export control violations related to unauthorized transfers and retransfers of technical data to foreign-person employees and contractors.

Boeing voluntarily disclosed the apparent violations of the International Traffic in Arms Regulations (ITAR), the majority of which occurred before 2020, the State Department said Thursday in a press release. The airline manufacturer cooperated with the agency’s investigation.

As part of the settlement, Boeing signed a three-year consent agreement, to be overseen by a special compliance officer. The agreement will also require two external audits of the company’s ITAR compliance program and the implementation of additional compliance measures.