49 CFR § 831.50 - Applicability of this subpart.
---
identifier: "/us/cfr/t49/s831.50"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 831.50 - Applicability of this subpart."
title_number: 49
title_name: "Transportation"
section_number: "831.50"
section_name: "Applicability of this subpart."
chapter_name: "NATIONAL TRANSPORTATION SAFETY BOARD"
part_number: "831"
part_name: "INVESTIGATION PROCEDURES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 1113(f)."
regulatory_source: "82 FR 29685, June 29, 2017, unless otherwise noted."
cfr_part: "831"
---
# 831.50 Applicability of this subpart.
(a) The regulations in this subpart apply when the NTSB is leading a marine or major marine casualty investigation.
(b) In a marine or major marine casualty investigation led by the United States Coast Guard (USCG), this subpart applies if:
(1) Upon USCG's request for assistance, the NTSB is leading an associated investigative activity; or
(2) Upon coordination with the USCG, the NTSB elects to collect, test or analyze additional evidence beyond the scope of the USCG's investigation.