How the NTSB Investigates an Aircraft Accident

The Role of the National Transportation Safety Board

The National Transportation Safety Board (NTSB) is the federal agency responsible for investigating civil aviation accidents in the United States. Its purpose is to determine the facts, circumstances, and probable cause of accidents and to issue safety recommendations intended to reduce future risk.

The NTSB’s work is investigative and safety-focused. It does not assign legal liability. However, its factual findings and technical analysis are often referenced by regulators, manufacturers, operators, insurers, and legal professionals.

Issues identified during the investigative process often form the foundation of subsequent aviation accident litigation, where questions of aircraft design, maintenance, operational decision-making, and regulatory compliance are examined in civil proceedings.

NTSB Investigation Resources

This page explains the phases and structure of NTSB aviation accident investigations. Two related resources address how these investigations intersect with civil aviation claims and how technical parties participate in the investigative process:

• NTSB Investigations & Civil Aviation Claims
• The NTSB Party Participant System in Aviation Accident Investigations

Stages of an Aviation Accident Investigation

While every investigation is different, most aviation accident investigations follow a similar sequence. The specific scope and timeline may vary depending on the type of aircraft, the severity of the event, and the complexity of the technical issues involved.

On-Scene Investigation

When the NTSB responds to an accident, investigators document the scene and preserve perishable evidence. This can include photographing wreckage and terrain, mapping debris fields, and recording observations that may assist later reconstruction.

Wreckage Examination

Investigators examine aircraft structures, systems, and components for evidence of damage, malfunction, or failure. In some cases, the wreckage is moved to a secure facility so components can be examined in a controlled environment.

Records and Maintenance Review

Investigators typically review maintenance logs, inspection records, airworthiness directives, and other documentation that may reflect the condition of the aircraft and compliance with regulatory requirements. Depending on the circumstances, they may also review pilot training records and operational policies.

Flight Data & Cockpit Voice Recorder Analysis

If the aircraft is equipped with recorders, the NTSB may recover and analyze flight data and cockpit voice recordings. These recordings can help investigators understand aircraft performance and cockpit activity leading up to the event. Not all aircraft—especially some general aviation aircraft—carry recorders.

Witness and Personnel Interviews

Investigators may interview witnesses, air traffic personnel, maintenance personnel, and others who may have relevant information. These interviews are used to supplement physical evidence and documentation.

What a Preliminary Report Does — and Does Not Mean

In the early stages of an investigation, the NTSB may release preliminary information. This information is typically factual and limited. A preliminary report is not a finding of fault, and it does not represent a final conclusion about the cause of the accident.

In many investigations, the NTSB’s final report and probable cause determination may take months (and sometimes longer), depending on the complexity of the evidence and analysis involved.

How NTSB Findings Relate to Civil Litigation

Although the NTSB does not assign legal liability, its factual findings may be referenced in civil proceedings and related evaluations. Civil litigation generally focuses on standards of care, regulatory compliance, and the responsibilities of parties such as operators, maintenance providers, manufacturers, or parts suppliers.

Aviation accident litigation often proceeds separately from the NTSB’s safety investigation. For an overview of the methodology involved see our firm’s Complex Aviation Litigation Methodology section.

Although National Transportation Safety Board investigations do not determine civil liability, the technical findings developed during the investigative process often play an important role in subsequent aviation accident litigation. Questions involving aircraft design, maintenance practices, operational decision-making, and regulatory compliance frequently become central issues in civil cases. We discuss several recurring patterns observed in reported aviation accident litigation in our analysis of Trends in Aviation Crash Verdicts: Observations from Reported Matters.

About This Page

This page is provided for informational purposes only. It describes general investigative procedures and does not provide legal advice or conclusions about any specific accident.