49 U.S.C. §  46101. Complaints and investigations

(a)          General.--(1) A person may file a complaint in writing with the . . .Administrator of the Federal Aviation Administration with respect to aviation safety duties and powers designated to be carried out by the Administrator) about a person violating this part or a requirement prescribed under this part.  [The] Administrator shall investigate the complaint if a reasonable ground appears to . . .  Administrator for the investigation.

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(3) The Secretary of Transportation, Under Secretary, or Administrator may dismiss a complaint without a hearing when the Secretary, Under Secretary, or Administrator is of the opinion that the complaint does not state facts that warrant an investigation or action.

(4) After notice and an opportunity for a hearing and subject to section 40105(b) of this title, the Secretary of Transportation, Under Secretary, or Administrator shall issue an order to compel compliance with this part if the Secretary, Under Secretary, or Administrator finds in an investigation under this subsection that a person is violating this part.