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Reliable Robotics Advances ACAS Xu Flight Testing for FAA Certification

Reliable Robotics conducts extensive flight tests of ACAS Xu Detect and Avoid system near Hollister, California, supporting FAA certification efforts.

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This article is based on an official press release from Reliable Robotics.

Introduction to ACAS X Flight Testing

As the aviation industry pushes toward the integration of uncrewed aircraft systems (UAS) into the National Airspace System (NAS), advanced collision avoidance technologies are becoming critical. Reliable Robotics recently announced significant progress in this area, detailing a comprehensive flight test campaign for its Detect and Avoid (DAA) system. According to a company press release, this initiative is part of an ongoing contract with the Federal Aviation Administration (FAA) to provide validation data for certifying DAA systems based on the Airborne Collision Avoidance System X (ACAS X).

The testing focuses on ACAS Xu, a variant specifically designed for autonomous fixed-wing aircraft. By integrating this algorithm with air-to-air radar and other sensors, Reliable Robotics aims to create an FAA-certifiable DAA solution capable of operating under Instrument Flight Rules (IFR) across all airspace classes. This development marks a crucial step in ensuring that uncrewed aircraft can safely share the skies with traditional, piloted traffic.

Advancing ACAS X for Uncrewed Systems

The FAA has been developing the ACAS X family of algorithms to modernize and improve upon the legacy Traffic Alert and Collision Avoidance System II (TCAS II). The new suite includes several versions tailored to different aircraft types: ACAS Xu for fixed-wing UAS, ACAS Xr for rotorcraft, and ACAS Xa as a direct replacement for TCAS II in transport-category aircraft. The primary advantage of ACAS X is its ability to reduce unnecessary alerts, particularly in terminal areas, while enhancing overall safety and separation.

Reliable Robotics is leveraging the ACAS Xu variant as it works toward a Supplemental Type Certificate (STC) to convert the Cessna 208B Caravan into a fully uncrewed aircraft system. In their official statement, the company noted that their DAA solution will provide surveillance against both cooperative and non-cooperative traffic, a vital requirement for safe airspace integration.

Flight Test Campaign Details

Simulating Real-World Encounters

To validate the system, Reliable Robotics has transitioned from Hardware In The Loop (HITL) testing to a rigorous, month-long flight test campaign. The company reports that the campaign involves over 50 scripted encounters in and around the terminal area of the Hollister public airport (KCVH) in California.

During these tests, Reliable’s Cessna 208B (registration N927FE) flies RNAV approaches under the control of an advanced automation system, commanded by a remote pilot located 50 miles away. Simultaneously, an instrumented Cessna 182 acts as an “intruder” aircraft, flying converging paths to create specific encounter geometries. The encounters are meticulously planned to simulate a loss of safe separation while maintaining strict safety margins, particularly near the closest point of approach (CPA).

“Successful completion of each encounter requires meticulous planning, close communication between the remote pilot and intruder pilot, and precise execution,” Reliable Robotics stated in their release.

Testing Minimum Equipage Scenarios

A key component of the flight test campaign is evaluating the DAA system’s performance against aircraft with minimal cooperative equipment. The Cessna 182 intruder is outfitted with the minimum viable equipment set required for compliance with current FAA ADS-B OUT mandates, a configuration common among smaller, older general aviation aircraft.

Because ADS-B OUT relies on GPS data, its integrity must be independently validated. Reliable Robotics explains that Mode C omnidirectional interrogation is insufficient for this task. Instead, their system uses an integrated non-cooperative track source, such as radar, to validate the ADS-B tracks and provide complete positional data. This ensures that accurate collision avoidance alerts can be issued even when encountering minimally equipped traffic.

Regulatory and Financial Backing

The push for advanced collision avoidance technology has strong backing at the federal level. The FAA has been funding research and development for ACAS X since 2008. Furthermore, Reliable Robotics highlighted that the Senate Transportation, Housing and Urban Development, and Related Agencies’ draft appropriations bill for Fiscal Year 2026 allocates $16 million specifically for continued ACAS X development.

This sustained financial support underscores the growing focus on modernizing airspace safety technologies to accommodate new entrants without compromising the safety of existing NAS stakeholders.

AirPro News analysis

We view the successful validation of ACAS Xu through real-world flight testing as a major milestone for the UAS industry. By proving that uncrewed systems can reliably detect and avoid both cooperative and non-cooperative traffic, even those with minimal ADS-B equipage, companies like Reliable Robotics are dismantling one of the most significant technical barriers to routine beyond visual line of sight (BVLOS) operations. We note that the $16 million allocation in the FY 2026 draft appropriations bill further signals that lawmakers view ACAS X not just as an experimental project, but as foundational infrastructure for the future of the National Airspace System.

Frequently Asked Questions

What is ACAS X?
ACAS X (Airborne Collision Avoidance System X) is a family of collision avoidance algorithms developed by the FAA to replace and improve upon legacy TCAS II systems. It includes variants for transport aircraft, rotorcraft, and uncrewed systems.

What aircraft is Reliable Robotics using for these tests?
Reliable Robotics is using a Cessna 208B Caravan (N927FE) equipped with their DAA system, and a Cessna 182 acting as the intruder aircraft.

Where are the flight tests taking place?
The flight tests are being conducted in and around the terminal area of the Hollister public airport (KCVH) in California.

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Photo Credit: Reliable Robotics

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UAV & Drones

DLR Opens Counter-Drone Security Center at Cochstedt Airport

DLR launched its Technology Center for Drone Security on Aug 18, 2026, following an explosive drone incident at Leipzig/Halle Airport.

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This is a developing story. Information may change as official details are released.

The German Aerospace Center (DLR), in partnership with federal security and research ministries, officially opened the Technology Center for Drone Security on August 18, 2026, establishing a dedicated facility to test counter-Drones under realistic Airports conditions.

The inauguration of the facility at Magdeburg-Cochstedt Airport (CSO) and Braunschweig follows a major security breach on August 4 and 5, 2026, when an explosive-laden drone was discovered on the tarmac at Leipzig/Halle Airport (LEJ). According to a DLR press release, the new center will bring together researchers, security authorities, and industry partners to develop technologies that protect critical infrastructure from uncrewed aircraft systems (UAS) misuse and hybrid threats.

Expanding Counter-UAS Testing Capabilities

DLR announced it will invest more than 10 million euros to expand the Technology Center, a project expected to create up to 40 new jobs. The site builds upon existing infrastructure at Magdeburg-Cochstedt Airport, which DLR acquired in 2019 to establish a dedicated drone testing environment.

Following the official launch of the National Experimental Test Center for Unmanned Aircraft Systems in 2021, DLR resumed full operations at the airport in 2022. Since 2021, facility utilization has increased by approximately 20 percent annually. In 2025, the site recorded over 200 days of use, with external customers accounting for about half of the operational activity.

Federal Minister of the Interior Alexander Dobrindt emphasized the operational value of the location. He stated that researching and testing counter-drone technology directly at an active airport addresses environments where the threat situation is most sensitive.

Heightened Security Context Following Leipzig/Halle Incident

The opening of the Cochstedt facility aligns with an immediate operational need for counter-UAS defenses in Germany. During the first week of August 2026, security personnel discovered a quadcopter drone carrying semtex plastic explosives near a Ukrainian cargo aircraft at Leipzig/Halle Airport. The discovery prompted a major security alert and a temporary shutdown of the airfield.

German federal authorities are actively investigating the incident. While The Guardian reported that United States intelligence officials suspect Russian involvement in the attempted sabotage, the German government has not issued a formal accusation. The official cause and origin of the drone remain under investigation.

Dobrindt characterized the Leipzig/Halle event as a professional hybrid threat scenario representing a new level of danger for the country, underscoring the urgency of the research being conducted at the new DLR facility.

Federal and State Integration

The Technology Center represents a formal collaboration between the Federal Ministry of the Interior (BMI), the Federal Ministry of Research, Technology and Space (BMFTR), and the Federal Criminal Police Office (BKA). The joint initiative aims to streamline the transition of counter-UAS technologies from research and development into active deployment by security forces.

Anke Kaysser-Pyzalla, Chair of the DLR Executive Board, noted that the center serves as a logical continuation of the successful cooperation between federal and state police authorities. Dorothee Bär, Federal Minister of Research, Technology and Space, confirmed that her ministry already funds the existing UAS competence and test centers at the site, highlighting the joint financial and operational commitment between the research and interior ministries.

AirPro News analysis

We view the activation of the Technology Center for Drone Security as a critical step in addressing the escalating vulnerability of commercial aviation infrastructure to asymmetric threats. The recent incident at Leipzig/Halle Airport demonstrates that airports are increasingly targeted by low-cost, highly capable UAS platforms deployed for sabotage or disruption.

Testing counter-UAS systems at an active airport like Magdeburg-Cochstedt provides invaluable data that cannot be replicated in isolated airspace. Mitigating drone threats in an airport environment requires navigating complex radio frequency congestion, avoiding interference with air traffic control systems, and ensuring the safety of conventional aircraft operations. As hybrid threats continue to evolve, we expect European airport operators and regulators to accelerate the procurement and certification of the defensive technologies currently being validated at the DLR facility.

Sources: German Aerospace Center (DLR)

Photo Credit: German Aerospace Center

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UAV & Drones

Dufour Aerospace Aero-200 eVTOL Targets 2027 Serial Production

Dufour Aerospace advances Aero-200 eVTOL commercialization with payload tests, BVLOS infrastructure, and logistics partnerships in Sweden and Canada.

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Dufour Aerospace is transitioning its Aero-200 tilt-wing electric vertical takeoff and landing (eVTOL) aircraft program from controlled flight testing to commercial deployment, emphasizing real-world operational capabilities over isolated performance metrics.

In a press release issued on August 18, 2026, the Swiss manufacturer detailed a series of recent milestones aimed at integrating the aircraft into existing logistics and medical transport networks. The company is focusing on weather resilience, remote operations control, and strategic partnerships to prepare the Aero-200 for serial production, which is targeted for 2027.

Demonstrating payload and range capabilities

A core component of the commercialization effort involves proving the aircraft can handle demanding mission profiles. On July 10, 2026, Dufour Aerospace completed a flight campaign at its Zurich-based test facility, successfully demonstrating the Aero-200 carrying a 20-kilogram payload over a 200-kilometer range.

To support scalable Beyond Visual Line of Sight (BVLOS) operations, the company has established a remote operator room in Dübendorf, Switzerland. This infrastructure is designed to manage flights in unpredictable weather and limited infrastructure environments.

“This flight campaign illustrates the profound potential the Aero-200 has for long-range missions carrying critical cargo or high-value sensors,” said Timon Wehmann, Chief Engineer at Dufour Aerospace. “For a vertical takeoff and landing drone in this category, navigating this distance while maintaining flawless stability throughout continuous maneuvering is a remarkable achievement.”

Strategic partnerships for commercial rollout

Dufour Aerospace has aligned with international operators to build the regulatory and operational framework necessary for deployment across different regions.

On May 6, 2026, the manufacturer announced a commercial partnership with Savback Helicopters to establish a long-range drone logistics network in Sweden. The agreement included a Memorandum of Understanding (MoU) for the acquisition of three Aero-200 aircraft. Michael Savback, Founder and Chief Executive Officer of Savback Helicopters, noted that the vast distances and challenging terrain in Sweden present a unique opportunity for drone logistics, framing the partnership as a step toward future Nordic unmanned logistics.

In North America, Dufour Aerospace is working with Volatus Aerospace to develop operations control center capabilities. On May 21, 2026, the companies completed their initial integration in Canada, marking the first remotely operated flight from the Volatus control center using Dufour’s scaled-down Aero-30 drone platform.

“The focus of our work with Dufour Aerospace is on building operational capability, not promoting individual performance metrics,” said Glen Lynch, Chief Executive Officer of Volatus Aerospace. “Governments and commercial operators alike are increasingly looking for reliable, runway-independent cargo solutions that can operate in remote and challenging environments.”

Targeting medical and regional logistics

The Aero-200 is being positioned as a cost-effective alternative to light helicopters for regional logistics and medical transport. Traditional rotorcraft face high operating costs and are susceptible to weather disruptions. According to data from the European Organisation for the Safety of Air Navigation (Eurocontrol) covering 2023 and 2024, weather conditions caused an estimated 10 to 15 percent of delays across European airspace.

In the medical sector, the speed and reliability of runway-independent drones offer measurable advantages. The press release cited a 2025 MDPI paper analyzing inter-hospital emergency drone deliveries in Madrid, which found time savings of 2 to 26 minutes compared to road transport. This represents a 35 to 58 percent reduction in transit time, achieving delivery times of approximately 15 minutes even during peak traffic periods.

AirPro News analysis

We view Dufour Aerospace’s recent updates as a necessary maturation step for the eVTOL sector. The industry is moving past the era of highly choreographed technology demonstrators and entering the complex phase of operational integration. By focusing on BVLOS infrastructure, control center integration with Volatus Aerospace, and specific regional use cases with Savback Helicopters, Dufour is addressing the unglamorous but critical hurdles of commercial aviation.

The emphasis on weather resilience and payload-range validation indicates that the company is preparing for the rigorous demands of European Union Aviation Safety Agency (EASA) certification. If the Aero-200 can consistently deliver 20-kilogram payloads over 200 kilometers in varied conditions, it presents a viable economic alternative to light helicopters for specialized logistics and medical operators.

Sources: Dufour Aerospace

Photo Credit: Dufour Aerospace

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UAV & Drones

Shield AI V-BAT Earns SAIL III Authorization for EU Maritime Ops

Shield AI’s V-BAT UAS secured SAIL III approval from ENAC, enabling Frontex maritime surveillance in the Central Mediterranean.

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Shield AI’s V-BAT unmanned aircraft system (UAS) has secured Specific Assurance and Integrity Level III (SAIL III) authorization from the Italian Civil Aviation Authority (ENAC), marking the highest approval level issued to date in Europe for unmanned maritime operations.

The authorization, detailed in an operational report published by Shield AI on August 17, 2026, enabled a maritime surveillance mission operated by Global Sat Tech for the European Border and Coast Guard Agency (Frontex). The operations were conducted from the Italian Coast Guard offshore patrol vessel Dattilo in the Central Mediterranean Sea, validating the integration of large vertical take-off and landing (eVTOL) Drones into regular maritime service under the European Union Aviation Safety Agency (EASA) Specific Operations Risk Assessment (SORA) framework.

Operational performance and maritime integration

During the deployment, which concluded in July 2026, two V-BAT aircraft logged 150 flight hours over 19 days at sea. At peak operational tempo, the two aircraft were airborne simultaneously for a combined 20 hours per day.

The V-BATs operated at distances up to 150 kilometers from the host ship. According to Shield AI, the platform maintained a 98 percent mission-readiness rate throughout the deployment. Falling into the 50-to-100 kilogram class, the V-BAT is the largest unmanned aircraft in its weight category to be flown by Frontex from a maritime vessel.

On July 8, 2026, senior representatives from Frontex and the Italian Coast Guard observed a live search and rescue simulation. During the exercise, a V-BAT successfully located a small inflatable boat and assisted in coordinating the simulated rescue response.

Regulatory milestones and global deployment

The SAIL III authorization represents a significant regulatory milestone for beyond visual line of sight (BVLOS) operations in European airspace. Shield AI initially announced the authorization and the completion of the Frontex pilot project on July 21, 2026.

The European deployment builds on the V-BAT’s established operational record. The platform has previously been deployed aboard United States Navy and United States Coast Guard vessels and is currently in service with the Royal Netherlands Navy. It has also conducted daily flight operations in Ukraine in environments with heavy electronic jamming. Additionally, defense forces in Japan and India have selected the V-BAT for maritime and army operations, respectively.

AirPro News analysis

Securing SAIL III authorization under the EASA SORA framework is a rigorous process that requires extensive documentation of system reliability, containment strategies, and operational procedures. For Shield AI, achieving this level of approval from ENAC demonstrates that the V-BAT can meet stringent European Safety standards for BVLOS flights in complex maritime environments.

We view this deployment as a critical proof of concept for the broader adoption of Group 3 VTOL UAS in European border and coast guard operations. The ability to operate a 50-to-100 kilogram aircraft from a patrol vessel without requiring a runway or recovery net significantly expands the organic intelligence, surveillance, and reconnaissance capabilities of individual ships. The 98 percent readiness rate over 150 flight hours suggests the platform has matured sufficiently to handle the corrosive and dynamic conditions of extended maritime deployments.

Sources: Shield AI

Photo Credit: Shield AI

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