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Chapter 03 of 23 · INV · Investigations

Structured findings,every factor to a barrier.

Investigate with the method the event deserves: 5-Why, Reason, HFACS, SHELL or Tripod, each with structured findings instead of a free-text essay. Every contributory factor links to the barrier it defeated, and every finding feeds a corrective action you can track to effectiveness.

INV-2026-0012NORTHGALE AIR · SYNTHETIC OPERATION
The why is pinned
The investigation runs structured, and its findings land as records: the defeated marshalling barrier and the corrective action that was closed without verification, both pinned as contributing factors on the graph.
Previously, on this operation
CAP-2026-0233
In the operation
INVInvestigations
4capabilities
3record types
4linked modules
Why it holds

A finding is structured, and it points at a barrier.

The method gives the investigation a shape, so two investigators reach comparable findings. Each contributory factor connects to the barrier it defeated and the action that will fix it, so the investigation ends in prevention, not a filed report.

What it does

The capabilities, on one record.

Method library

5-Why, Reason, HFACS, SHELL and Tripod, chosen to fit the event, not forced onto every one.

Structured findings

Findings are typed records with owners, not paragraphs. Comparable across investigators and across years.

Factor to barrier

Every contributory factor links to the barrier it defeated, so the hazard register learns from the event.

Feeds corrective action

Each finding spawns a corrective action that closes on a signed effectiveness gate, not on a written plan.

The records it produces

Real records, one reference each.

Every record carries a stable reference and a source on every field. Nothing is silently overwritten, and the trail is the record.

The method fits the event, not the other way around

Findings are structured records, not free text

Every contributory factor links to a barrier

An investigation ends in a tracked corrective action

INV
Investigations
5-Why, Reason, HFACS, SHELL, Tripod.
FND
Findings
Structured, owned, linked to a barrier.
CAP
Actions
Corrective, verified for effectiveness.
The gate

Findings are records, not prose.

Every contributory factor links back to a barrier or an action someone can own. A conclusion that cannot be acted on is not a finding.

◉ CHAPTER 03 / 23NORTHGALE AIR · SYNTHETIC OPERATION
Next chapter
04 · Safety Indicators

The why is on record. The next chapter is the instrument that saw it coming a month earlier, in the indicator drift.