§ 831.51 Definitions.

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Title 49 CFR: Transportation › Chapter VIII: NATIONAL TRANSPORTATION SAFETY BOARD › Part 831: INVESTIGATION PROCEDURES › Subpart E: Marine Investigations › § 831.51: § 831.51 Definitions.

This text was captured on Aug 14, 2026. It is a snapshot, not a live feed, so check the official code before relying on it.

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The following definitions apply throughout this subpart.

IIC

means the NTSB investigator-in-charge.

Investigative activity

means an activity performed by or under the direction of the NTSB during a casualty investigation led by the USCG.

Major marine casualty

is defined in joint regulations of the NTSB and USCG at 49 CFR 850.5(e) and 46 CFR 4.40-5(d), respectively.

Marine casualty

means—

(1) Any casualty, accident or event described in 46 CFR 4.03-1

(2) An occurrence that results in an abandonment of a vessel

(3) Other marine occurrences that the NTSB or USCG, or both, determine require investigation.

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