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What Twenty Years of NTSB Records Say About VFR Into IMC

History

Written by
The FlightReady Team
Category
Risk Method
Date
May 26, 2026

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The Shape of the Record

Read enough NTSB reports on continued VFR into instrument conditions and the striking thing is how similar the beginnings are. Not the weather — the weather varies. What repeats is the setup: a flight that departed in acceptable conditions, a deterioration that arrived gradually, and a sequence of small decisions each of which was individually defensible. The accident is rarely a single bad choice. It is the absence of a moment where the whole picture was reassessed at once.

Historical accident records grouped by contributing factor on a laptop

Gradual Is the Dangerous Word

A sharp deterioration triggers a decision. A gradual one does not, because no single moment feels like the moment. The record is full of flights where visibility fell over forty minutes and no leg of that descent was, by itself, the point at which a turn was obviously required. This is a known human-factors problem and not a competence problem, which is why the countermeasure is structural: decide the trigger before you launch, and make the reassessment happen on a schedule rather than on a feeling.

What History Can and Cannot Tell You

Accident records describe what has already happened along a corridor. They do not predict what will happen on your flight, and any tool that implies otherwise is overselling. Their real value is narrower and still considerable: they tell you which factors have actually mattered in the terrain and airspace you are about to enter, so your attention goes to the questions that have historically been the ones worth asking there.

Using It Before the Flight

FlightReady searches an ingested NTSB corpus along the corridor around your route, rather than only near the departure and destination fields, and groups what it finds by contributing factor. It is always presented as historical. The point is not a number to clear you — it is to have read, before departure, what has gone wrong in this particular place, while there is still time for that to change the plan.

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Table of Content

  • The Shape of the Record
  • Gradual Is the Dangerous Word
  • What History Can and Cannot Tell You
  • Using It Before the Flight

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