How AAIB conducts probe into air crashes

A helicopter crash near Joshimath in Uttarakhand’s Chamoli district killed everyone aboard. The six victims included the pilot. The accident matters because it triggers a formal investigation into what happened and how similar crashes might be prevented.

The helicopter was operated by Trans Bharat Aviation. It was travelling from Badrinath to Dehradun when it crashed into a hillside. The Aircraft Accident Investigation Bureau, or AAIB, is scheduled to investigate the accident under India’s Aircraft (Investigation of Accidents and Incidents) Rules, 2025.

The investigation will examine the circumstances and causes of the crash. It is not meant to assign blame or decide legal liability. Investigators will secure the wreckage, examine aircraft components, review maintenance and operational records, and analyse flight and cockpit recordings. Their findings can support safety recommendations for future flights.

The Aircraft Accident Investigation Bureau, or AAIB, investigates aircraft accidents in India. Its central task is to establish the circumstances and causes of an occurrence. This matters because a clear, independent safety investigation can reveal failures that need fixing, even when no person is blamed.

For example, the AAIB will investigate the helicopter crash near Joshimath. Investigators can examine the wreckage, flight recorders, maintenance records, operational procedures, witness accounts and other evidence. The investigation is conducted under the Aircraft (Investigation of Accidents and Incidents) Rules, 2025, which provide the operating framework.

The AAIB’s work is separate from judicial or disciplinary proceedings. The rules specifically state that an investigation is not intended to assign blame or determine liability. Instead, its findings should lead to recommendations that reduce the chance of another accident or serious incident.

Responsibility depends on the type of occurrence. The AAIB investigates all aircraft accidents in India. For incidents and serious incidents, responsibility is shared with the Directorate General of Civil Aviation, or DGCA. This division helps match investigations with the occurrence’s seriousness and the rules’ thresholds.

The AAIB investigates serious incidents involving aircraft weighing more than 2,250 kilograms or turbojet-powered aeroplanes. The DGCA investigates other incidents and serious incidents. However, the AAIB can take over any investigation. The AAIB also decides whether an occurrence is classified as an accident, serious incident or incident.

After a report is made, the AAIB Director General may authorise a preliminary investigation. That assessment establishes the occurrence’s nature, confirms its classification and identifies the technical expertise needed. For a full investigation, the Director General appoints an Investigator-in-Charge to lead the work.

Securing the crash site protects evidence from being altered, lost or contaminated. Under Rule 7, wreckage cannot be moved or disturbed unless doing so is necessary to save lives or prevent further damage. This preserves the physical clues investigators need to reconstruct the accident.

After search-and-rescue operations end, the AAIB becomes custodian of the wreckage and flight recorders. Investigators examine aircraft components and collect other evidence. They analyse the flight data recorder, or FDR, to establish the aircraft’s operating parameters. They also examine the cockpit voice recorder, or CVR, for communications between the cockpit crew and air traffic control.

These sources are combined with maintenance records, operational procedures, witness statements and other material. Together, they help investigators build a detailed account of the accident. Preserving the site and records therefore supports reliable conclusions and useful safety recommendations.

AAIB investigators have broad legal powers to establish what happened during an aircraft accident. These powers matter because evidence may be spread across people, records, aircraft parts and locations. Investigators need lawful access to gather and preserve the complete picture.

Under Rule 10, they can summon and examine witnesses and record their statements. They can obtain signed declarations, seize relevant documents and flight recorders, and enter and inspect places connected with the investigation. These powers support both technical analysis and the collection of firsthand accounts.

The evidence is then considered alongside wreckage, maintenance records, operational procedures and recorder information. A full investigation is led by an Investigator-in-Charge appointed by the AAIB Director General. The process is focused on identifying circumstances and causes, not assigning blame or determining liability, and its conclusions can inform prevention measures.

An AAIB investigation moves from evidence collection to a formal report. The report records the circumstances and causes identified by investigators. This matters because the investigation’s safety value continues after the wreckage and recordings have been examined.

For a full probe, an Investigator-in-Charge studies the wreckage, flight recorder information, maintenance records, operational procedures and other relevant material. The draft final report is then shared with the relevant States. They have thirty days to submit observations, and that period can be extended to sixty days. The AAIB Director General accepts the final report.

The article states that the investigation’s main objective is to recommend measures preventing similar occurrences. It is not intended to assign blame or determine liability. Therefore, the report’s forward-looking role is to identify safety lessons and improvements, while remaining separate from judicial and disciplinary proceedings.

An aircraft accident investigation is designed to explain an accident and improve future safety. Its main objective is to identify the circumstances and causes, then recommend measures to prevent similar occurrences. That purpose differs from deciding who should be punished or who is legally responsible.

For the Joshimath crash, investigators will examine wreckage, flight recorder data, cockpit communications, maintenance records, operational procedures and witness evidence. They can also question witnesses and obtain documents under their legal powers. This broad review helps identify contributing factors rather than narrowing the inquiry to a blame decision.

The rules expressly separate the investigation from judicial or disciplinary proceedings. That separation gives the investigation a distinct role: producing safety findings and recommendations. The final report can therefore highlight lessons for aviation operations and help reduce the risk of similar accidents, while other processes address legal or disciplinary questions separately.