| No. | Ch. 4 major investigation |
|---|---|
| 1 | General |
| 2 | Responding to a notification |
| 3 | Securing documentation |
| 4 | Field phase of the investigation |
| 5 | Post-field phase of the investigation |
| 6 | Investigation reporting |
| 7 | Investigation management system (IMS) |
| 8 | Major accident investigation Guide(MAIG) |