Investigators examining the helicopter crash in Uttarakhand that killed six people are widening their inquiry to include other flights that took off from Badrinath around the same time, as they try to determine whether adverse weather alone caused the accident or whether a combination of factors was involved.
The focus on neighbouring flights reflects a central puzzle in the case: several other helicopters flew the same route on the same day and reached their destinations safely, raising questions about what was different about the flight that crashed.
The aircraft, operated by Trans Bharat Aviation, crashed at Sthan Marwadi in Uttarakhand on Friday, while returning to Dehradun from the Badrinath shrine. According to reporting by The Indian Express, two other helicopters departed from Badrinath not long after the ill-fated aircraft took off, and both landed safely. One left just eight minutes after the crashed helicopter, and another departed nearly an hour later.
In addition, two flights that flew before the Trans Bharat helicopter also completed their journeys safely. Officials told the newspaper that this pattern will be considered as part of the probe, because it complicates any simple explanation based solely on weather.
Flying operations in the Badrinath Valley had been suspended for three hours on Friday morning because of inclement weather between 9 am and noon, before resuming after conditions were judged to have improved. The Trans Bharat helicopter departed from Dehradun at 12.20 pm and landed at Badrinath at 1.11 pm. Immediately after landing, the pilot picked up five passengers for the return journey to Dehradun.
It was during that return leg that the helicopter crashed. An official, speaking on condition of anonymity, told The Indian Express that the flight had already completed a successful trip from Dehradun to Badrinath before turning back, and that the fact that other flights succeeded before and after it made the cause less clear.
The official was quoted as saying that investigators were not sure what exactly went wrong, and that it could have been a local weather phenomenon or some other issue. That uncertainty is at the heart of the investigation. In mountain flying, weather can change dramatically over a short distance and a short period.
A valley that appears clear from one vantage point can contain a sudden patch of cloud, rain or turbulence a few kilometres away, and a pilot's experience of conditions can differ sharply from that of another pilot flying minutes earlier or later.
That is why investigators are speaking to pilots who flew in the region around the time of the accident, to build a detailed picture of the conditions prevailing at the time, rather than relying on a single forecast or a single observation.
The Chamoli district administration's initial Action Taken Report had said the helicopter encountered adverse weather conditions in the Hathi Parvat area and crashed while descending towards a lower altitude. The India Meteorological Department had issued an orange alert for Chamoli on October 30, warning of thunderstorms accompanied by lightning, hail and gusty winds of 40 to 50 kilometres per hour in isolated areas.
That alert provides important context, but it does not by itself answer the question of why this particular flight, among several on the day, met with disaster. Investigators will need to reconcile the forecast, the actual conditions reported by other pilots, and the physical evidence from the wreckage.
The Aircraft Accident Investigation Bureau, the country's principal agency for investigating serious aircraft accidents, has sent a team to the accident site. Efforts are under way to retrieve as many aircraft components as possible in order to reconstruct the sequence of events.
An official told The Indian Express that the team had not yet received the black box, and that it was at the accident spot trying to retrieve as many parts as possible to analyse the situation completely. The wreckage has been almost entirely destroyed, with the tail section being the only part that remains relatively intact, which will make the reconstruction work painstaking and dependent on whatever data can be recovered.
Recovery of the victims was itself a difficult operation. The bodies of all six victims were recovered in an overnight operation, but the work was hampered and delayed by difficult terrain. The accident site is 20 to 22 kilometres from the nearest roadhead and can only be accessed through a difficult trek.
The bodies were brought from the mountainous site to the road near Chai village and then taken to the Community Health Centre in Jyotirmath, before being transported to Rishikesh for post-mortem examinations, after which they would be handed over to their families. The remoteness of the site, which complicated rescue and recovery, will also complicate the investigation, since investigators must work in the same difficult terrain.
In parallel with the investigation, regulators have moved to tighten safety rules for the remainder of the Char Dham season. The Directorate General of Civil Aviation has decided to make the presence of a co-pilot mandatory for all charter helicopter operations for the rest of the season, ending the practice of single-pilot charter flights in this context.
A meeting was held on Saturday to discuss flight operations for the remainder of the season, after which the regulator decided against allowing single-pilot operations for charter flights. An official said the decision had been set in stone, with a co-pilot now mandatory for all charter operations from that point on, while further investigation into the cause of the accident continues.
The Uttarakhand Civil Aviation Development Authority has also introduced a new clearance regime. Pilots operating on the Char Dham route will now have to obtain separate clearance from the authority before every flight, following instructions from the Directorate General of Civil Aviation. Previously, permission could be granted for a complete journey, such as from Dehradun to Badrinath and back.
In this case, the helicopter had been granted permission for the complete journey from Dehradun to Badrinath and back. Under the new rules, a pilot who wants to fly from one point to another, and then onward to a third point, will need fresh permission for each leg.
The authority's chief executive, Prateek Jain, explained the change to the Press Trust of India, noting that the regulator had categorically stated that every sortie between one point and the second point would require clear permission.
The authority has also pointed to a gap in weather monitoring. It has a weather observation system at Badrinath, but it lacks such a system in the valley near Joshimath, where the crash occurred. Pilots rely on local observations and radio communication to warn about rain patches or change direction.
Officials told the Press Trust of India that three helicopters had taken off within a 15-minute window before and after the crash, and that those pilots usually communicate by radio and alert each other about conditions. Investigators will therefore examine whether information about conditions was shared effectively, and whether the absence of a monitoring station in the valley contributed to a gap in situational awareness.
The crash has renewed attention on the safety record of helicopter operations on the Char Dham pilgrimage routes, which have witnessed several accidents and emergency landings in recent years. The routes involve high-altitude flying in mountainous terrain, often in rapidly changing weather, with a high volume of pilgrim traffic during the season. Those factors combine to create a challenging operating environment, even for experienced pilots and well-maintained aircraft.
Each accident prompts a review of rules, but the recurrence of incidents suggests that the underlying risks are structural, linked to terrain, weather, traffic density and the pressure of seasonal demand, rather than to a single lapse.
At this stage, investigators have been careful not to prejudge the outcome. The fact that other flights succeeded does not prove that weather was not a factor, because local conditions can vary sharply in the mountains. Equally, the fact that an orange alert was in force does not prove that weather alone caused the crash, because other pilots navigated the same period safely.
The truth is likely to emerge only from a careful reconstruction that combines wreckage analysis, flight data if it can be recovered, pilot testimony, weather records and the sequence of clearances. That work will take time, and officials have indicated that preliminary findings are expected within a month, followed by a detailed report with safety recommendations.
Until then, the immediate priority is to ensure that the remainder of the season operates under tighter safeguards. The mandatory co-pilot rule and the flight-by-flight clearance requirement are designed to add layers of redundancy and oversight at a time when confidence in the system has been shaken.
Whether those measures are sufficient, and whether they should become permanent features of Char Dham helicopter operations, will depend on what the investigation ultimately finds about a flight that began as a routine return journey from Badrinath and ended in tragedy in the mountains of Chamoli.
(Reporting based on The Indian Express and The Times of India.)