---
kind: "unit"
title: "49"
title_heading: "Transportation"
key: "subtB/chVIII/part831"
level: "part"
label: "Part 831"
heading: "Investigation Procedures"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/49/subtB-chVIII-part831"
sections_count: 35
---

# Part 831 — Investigation Procedures

Title 49 C.F.R. — Transportation › Subtitle B — Other Regulations Relating to Transportation › Chapter VIII — National Transportation Safety Board

## Contents

- [Subpart A — General](/cfr/49/subtB-chVIII-part831-subpartA.md)
- [Subpart B — Aviation Investigations](/cfr/49/subtB-chVIII-part831-subpartB.md)
- [Subpart C — Highway Investigations](/cfr/49/subtB-chVIII-part831-subpartC.md)
- [Subpart D — Railroad, Pipeline, and Hazardous Materials Investigations](/cfr/49/subtB-chVIII-part831-subpartD.md)
- [Subpart E — Marine Investigations](/cfr/49/subtB-chVIII-part831-subpartE.md)