Understand your flight

How does an NTSB investigation work, and how long does it take?

After an accident in the US, the NTSB sends a team of specialists, publishes a short factual preliminary report within about 30 days, and aims to finish with a final report and probable cause in 12 to 24 months. Knowing the timeline makes the news easier to read.

4 official sources, listed at the end Checked October 19, 2026
Photo: unknown photographer (Koninklijke Luchtmacht), CC0
In this article · 7 sections
  1. Why this helps when you're anxious
  2. Who the NTSB is
  3. The five stages
  4. The Go Team
  5. The timeline, in plain numbers
  6. Reading the news with this in mind
  7. Keep reading

Why this helps when you're anxious

When a plane crash is in the news, the hardest part is often the gap: lots of coverage, few answers. Knowing how the official process works, and roughly when real information arrives, makes it easier to put the phone down and wait for facts instead of guesses.

This page explains the US process, run by the National Transportation Safety Board (NTSB). It doesn't comment on any open investigation.

Who the NTSB is

The NTSB is the independent US agency that investigates transportation accidents and works out their probable cause. Its focus is safety, not blame: if an event turns out to be criminal, the NTSB says law enforcement or the FBI takes the lead instead.1 The NTSB's party system lets it investigate about 1,200 aviation accidents and incidents a year.1

The five stages

The NTSB describes every investigation as going through the same general process, with phases that overlap:1

  1. Notification and the decision to investigate.
  2. On-scene fact gathering. Wreckage, records, interviews.
  3. Analysis of the facts and determination of probable cause.
  4. A final report, adopted by the Board or approved under delegated authority.
  5. Safety recommendations to regulators, manufacturers and others, which the NTSB then follows up.

The Go Team

For a major accident, the NTSB sends a Go Team of specialists who are on call around the clock. It's led by an Investigator-in-Charge, and each member covers one area: operations, structures, engines, aircraft systems, air traffic control, weather, human performance and survival factors.2 Representatives of the "parties" (often the FAA, the airline, unions and the manufacturers) work in groups under each NTSB specialist.2

The flight recorders, the so-called black boxes, go to the NTSB's laboratory in Washington, DC, where their data is read out.4 More on those in what is a black box?

The timeline, in plain numbers

  • The first days: investigators on scene. Briefings describe facts, not causes.
  • About 30 days: NTSB investigation pages typically say a preliminary report is expected within 30 days. It contains factual information from the first phase of the investigation.3
  • 12 to 24 months: the final report, with the probable cause and any contributing factors.3 The NTSB says it generally aims to finish within that window, though complex cases and workload can affect it.1

Reading the news with this in mind

  • "Investigators haven't said what caused it." That's normal and correct in the first weeks. Cause comes at the end.
  • Theories in the first 48 hours usually come from commentators, not investigators.
  • Cockpit audio is never released. Congress requires the NTSB not to release any part of a cockpit voice recording; at most, a written transcript of pertinent parts is released later.4
  • Recommendations are the point. The NTSB says its work doesn't end with the probable cause; it pushes for safety changes and tracks whether they're adopted.1

If headlines are getting to you, our guide to coping with crash news and the Is it safe to fly right now? page put things in context, without odds or scores.

The calm takeaway: a slow, careful investigation is the system working. Facts arrive in stages, and each one feeds back into making flying safer.

Keep reading

Quick answers

How long does an NTSB investigation take?

The NTSB says it generally tries to complete an investigation within 12 to 24 months, though complexity and workload can change that.

When does the NTSB release a preliminary report?

NTSB investigation pages typically say a preliminary report is expected within 30 days of the accident. It contains factual information only, not a cause.

Does the NTSB say what caused a crash right away?

No. The probable cause comes in the final report. Early on, investigators gather facts; the preliminary report describes what happened without deciding why.

Who takes part in an NTSB investigation?

NTSB specialists lead it. Under the NTSB's party system, organisations such as the FAA, the airline, unions and the manufacturers can be named as parties to help with technical work.

Sources

(4)
  1. NTSB, The Investigative Process
  2. NTSB, The Go Team
  3. NTSB investigation page WPR26MA063 (example of the standard timeline wording)
  4. NTSB, Cockpit Voice Recorders (CVR) and Flight Data Recorders (FDR)

Facts last checked against these sources: October 19, 2026.