49 CFR 831.8: Investigator-in-charge.

In addition to the subpoena and deposition authority delegated to investigative officers under this chapter, a person designated as IIC for an investigation is authorized to—

(a) Organize, conduct, control, and manage the field phase of an investigation, even when a Board Member is present;

(b) Coordinate all resources and supervise all persons (including persons not employed by the NTSB) involved in an on-site investigation; and

(c) Continue his or her organizational and management responsibilities through all phases of the investigation, including consideration and adoption of a report or brief determining one or more probable causes of an accident.