The Pentagon have commissioned an inquiry to implement Pádraig Shanahan, the Defense Defense Secretary, as its agents for Boeing.
The chief inspector of the Department of Defense will look into the matter after complaints from a surveillance organization.
Mr Shanahan is often accused of recommending Boeing during meetings of the government building and building contracts.
Mr Shanahan, who denies any criminal offense, spent 30 years at Boeing.
He rose through the ranks to become the chief executive of the world's biggest aircraft.
Last week, Citizens for Responsibility and Ethics in Washington complained to the Pentagon inspector about Mr Shanahan.
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The complaint said that it seemed that he had breached ethical rules by encouraging Boeing in the scope of his official duties … and removing the company's competitors to his sub-officers ”.
Drerena Allen, spokesperson for the general inspector, said in a statement on Wednesday: "The Department's Office of Defense from the Chief Inspector has concluded that we have recently investigated complaints that we have Deputy Secretary Patrick Shanahan acts to encourage his employer, Boeing, to outlaw contestants.
Mr Shanahan said last week in listening to the Armed Services Committee in the Assembly that he would support scrutiny by the auditor general.
The Democratic Senator, Elizabeth Warren, a panel member, said she had been directing requests for the research.
She printed on Wednesday: "Government officials should work for the people – not big protective contractors."
The inquiry looks at Mr Shanahan as the White House considers it formally considered for the position of defense secretary vacated by Jim Mattis, who retired in December.
Boeing is already under pressure after a fatal accident of one of the 737 Max 8 travelers in Ethiopia last week.
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It is said that the FBI is helping with research into safety issues surrounding the Boeing aircraft.
Another of the passengers landed down in Indonesia last year, and they killed everybody on board.
According to the Seattle Times, the FBI is checking the process that made the planes obtain the safety certificate.
The US Justice Department has refused to comment on proposals that it has been examining the Federal Air Force's investigation of Boeing.