(a) Except as provided in Subpart E of this part regarding marine casualties, and unless specified by the National Transportation Safety Board (NTSB), the provisions of this subpart apply to all NTSB investigations conducted under its statutory authority.

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(b) Consistent with its statutory authority, the NTSB conducts investigations of transportation accidents that include, but are not limited to: accidents, collisions, crashes, derailments, explosions, incidents, mishaps, ruptures, or other similar accidents. Use of the term “accident” throughout this part includes all such occurrences.

(c) Throughout this part, the term “IIC” means the NTSB investigator-in-charge.