A recent fatal collision between two firefighting helicopters west of Athens has highlighted the dangers inherent in aerial firefighting operations, as efforts continue to develop technologies aimed at reducing such risks. The crash, which occurred on Sunday, resulted in the deaths of two crew members. While one of the helicopters managed to release its water payload and land safely, the other was unable to avoid the collision, leading to the fatal outcome.
The incident comes amid a rise in wildfires worldwide, a trend attributed largely to the climate crisis, which has increased reliance on aerial firefighting assets including planes, helicopters, and drones. These platforms often operate simultaneously in complex and hazardous environments characterized by smoke and limited visibility. Ground crews deploy drones to monitor fire progression, coordinate firefighting efforts, and identify threats to personnel, but pilots must navigate congested airspace without clear visibility of all nearby aircraft.
This challenge is well known in military aviation as well, with helicopter midair collisions having caused significant losses. In Israel, the deadliest such event occurred in 1997 when two CH-53 heavy lift helicopters collided, killing all 73 soldiers and crew on board both aircraft.
In response to these risks, an Israeli company named Ciconia has developed a decentralized collision avoidance system intended to prevent midair accidents. Drawing inspiration from the flocking behavior of storks, the system shares flight data and trajectories within a several-kilometer range among participating aircraft. This enables each aircraft to independently construct a real-time map of nearby traffic without depending on centralized control.
For manned aircraft, the technology issues collision warnings and, if required, direct instructions for evasive maneuvers. In the case of drones, commands are sent directly to their flight control systems. The Israel Air Force has tested the system on two Black Hawk helicopters, with pilots providing positive assessments. Despite these trials, the system has not yet been adopted by the Israel Air Force for widespread use, nearly three decades after the 1997 disaster, although some argue it could have prevented such accidents.
Beyond Israel, Ciconia is part of a U.S. initiative to enhance aerial wildfire operations amid increasing wildfire frequency and severity linked to climate change. The company has conducted demonstrations of its collision avoidance system in Texas and is scheduled for another trial next week in San Bernardino County, California. These efforts are supported by Qualcomm and include plans to equip several helicopters with the system as part of a pilot program for further assessment.