UAV & Drones
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.

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.
Sources
Photo Credit: Reliable Robotics
UAV & Drones
NAVAIR Issues RFI for Carrier-Based Autonomous Combat Drone
NAVAIR seeks industry proposals for a carrier-capable autonomous combat drone with a 24-month first flight requirement and $30M unit cost goal.

This is original reporting and analysis by AirPro News.
The Naval Air Systems Command (NAVAIR) has formally initiated its search for a carrier-capable autonomous combat drone, issuing a Request for Information on August 31, 2026, that demands a first flight within 24 months of a contract award.
The solicitation, published on the U.S. government contracting site SAM.gov on behalf of the Future Advanced Capability Program Management Office (PMA-228), outlines requirements for the Navy Collaborative Combat Aircraft (CCA) Increment 1 Prototype Project. The Navy is seeking industry capability statements to deliver two fully functional prototype air vehicles capable of operating from Nimitz-class and Gerald R. Ford-class nuclear aircraft carriers (CVNs).
Rapid acquisition and technical specifications
The RFI establishes an aggressive development schedule for the CCA program. NAVAIR requires the selected contractor to achieve first flight of the prototype within 24 months of the agreement award. The aircraft must also reach shore-based carrier certification within three years.
To meet the Navy’s operational needs, the uncrewed aircraft must be capable of carrying up to four weapons externally, with a maximum weight of 2,500 pounds per weapon. The prototypes must be designed to operate in maritime environments up to Sea State 5. The solicitation emphasizes that physical dimensions, height, width, and weight thresholds must align with existing carrier deck, elevator, and hangar bay constraints.
According to the RFI document, the Navy has set an affordability goal of $30 million per unit. The service outlined the strategic necessity of the program in the solicitation:
As threat networks grow increasingly complex, the Navy must adapt combat strategies by focusing on collaborative manned-unmanned operations, modular open standards, and rapid, cost-effective prototyping.
Strategic shift toward uncrewed carrier aviation
The Navy’s move into hardware prototyping follows similar initiatives across the Department of Defense (DoD). According to reporting by DefenseScoop, the U.S. Air Force awarded Increment 1 production contracts in mid-2026 to General Atomics for the YFQ-42A Dark Merlin and Anduril for the YFQ-44A Fury. The outlet also noted that the U.S. Marine Corps has awarded development contracts to Northrop Grumman and Kratos for uncrewed platforms.
The NAVAIR program aims to provide the Carrier Air Wing (CVW) with lethal, survivable, and persistent platforms capable of operating directly from the sea. Industry responses to the RFI are due by September 18, 2026. NAVAIR has scheduled an Industry Day for September 22, 2026, in California, Maryland, to further discuss the prototype project requirements with prospective contractors.
AirPro News analysis
We note that the specifications outlined in the August 31 RFI suggest a pivot toward a heavy, strike-capable uncrewed combat air vehicle (UCAV) rather than a lightweight “loyal wingman” designed solely to absorb enemy fire or carry sensors. The requirement to carry four 2,500-pound external weapons indicates a platform with significant payload capacity and structural robustness. This capability profile closely echoes the ambitions of the Unmanned Carrier-Launched Airborne Surveillance and Strike (UCLASS) program and the Northrop Grumman X-47B demonstrator, a historical parallel also highlighted by aviation publication The War Zone. By demanding a $30 million unit cost alongside heavy payload and carrier suitability, the Navy is setting a high bar for manufacturers attempting to balance affordability with the structural penalties inherent to carrier aviation.
Sources: SAM.gov (NAVAIR)
Photo Credit: General Atomics
UAV & Drones
FAA Completes First Remotely Piloted eVTOL Cargo Flight
FAA, Elroy Air, and Louisiana complete first remotely piloted hybrid-electric cargo demo under the eIPP on Aug 31, 2026.

The Federal Aviation Administration (FAA), in partnership with Elroy Air and the Louisiana Department of Transportation and Development (LADOTD), announced the completion of the first remotely piloted hybrid-electric cargo demonstration flight under the agency’s eVTOL Integration Pilot Program (eIPP) on August 31, 2026.
Conducted at Houma-Terrebonne Airport (HUM) in Houma, Louisiana, the test utilized the Elroy Air Chaparral, a highly automated hybrid-electric vertical takeoff and landing (VTOL) aircraft. According to the FAA press release, the demonstration is designed to provide operational data to identify regulatory gaps, refine procedures, and support the safe integration of Advanced Air Mobility (AAM) aircraft into the National Airspace System.
Expanding autonomous cargo delivery capabilities
The Houma demonstration marks a specific milestone for the eIPP by focusing on uncrewed, remotely piloted operations for logistics. FAA Administrator Bryan Bedford stated that the collaboration with LADOTD yields data necessary to transition AAM concepts from trial phases to active deployment.
“These test flights demonstrate how these new aircraft can expand cargo delivery options to communities nationwide and improve our logistics infrastructure,” Bedford said.
Elroy Air CEO Andrew Clare characterized the autonomous flights as the initial step in a broader deployment strategy, acknowledging the coordination between state and federal authorities to facilitate the testing.
“This week’s series of uncrewed, autonomous flights in Houma, Louisiana are the first step in that process, and we’re grateful to the FAA, the State of Louisiana, Secretary Duffy, USDOT, and the White House for their leadership in making it possible. We’re ready to deliver,” Clare said.
The eVTOL Integration Pilot Program timeline
The eIPP framework originates from the Unleashing Drone Dominance Executive Order issued in June 2025. Following the directive, the U.S. Department of Transportation (USDOT) selected eight projects in March 2026 to participate in the program, encompassing operations across 26 states.
The Elroy Air test follows a series of recent eIPP demonstrations conducted throughout August 2026. On August 6, 2026, Ampaire Inc. and the Utah Department of Transportation completed a hybrid-electric flight along the Interstate 15 corridor between Salt Lake City International Airport (SLC) and Cedar City Regional Airport (CDC) to test future cargo service.
Subsequently, on August 18, 2026, the FAA announced that Electra partnered with transportation departments in Pennsylvania and New Jersey to test hybrid-electric flights connecting local facilities in Manassas, Virginia, to major airline hubs in Philadelphia, Pennsylvania.
AirPro News analysis
The progression of eIPP demonstrations throughout August 2026 highlights a deliberate FAA strategy to test diverse AAM use cases in rapid succession. While the Ampaire and Electra flights focused on hybrid-electric connections between regional and major airports, the Elroy Air demonstration introduces the regulatory complexities of remotely piloted, autonomous systems. By gathering data on uncrewed VTOL operations in a controlled environment like Houma-Terrebonne Airport, regulators can better define the certification pathways and airspace management protocols required before autonomous middle-mile cargo delivery can achieve commercial scale. We expect the FAA to utilize this operational data to draft specific operational rules for uncrewed AAM platforms in the coming year.
Sources: Federal Aviation Administration, Federal Aviation Administration (Electra demonstration), Federal Aviation Administration (Ampaire demonstration)
Photo Credit: FAA
UAV & Drones
Zuri Unveils Uncrewed Cargo VTOL With 6M Euro Series A
Czech developer Zuri launches its hybrid-electric cargo VTOL, opens a 6M euro Series A, and targets first deliveries by 2029.

Czech aircraft developer Zuri has officially unveiled its uncrewed cargo vertical takeoff and landing (eVTOL) aircraft, marking the company’s first commercial product launch. The announcement on August 27, 2026, coincides with the opening of a €6 million Series A funding tranche designed to finance the upcoming flight test campaign for its Technology Demonstrator 2.0 (TD 2.0).
In a press release issued today, Zuri detailed its strategic shift toward commercializing an uncrewed logistics variant before pursuing a passenger-carrying model. The hybrid-electric tiltrotor targets civil and defense logistics operations, including offshore platform resupply and disaster relief, utilizing a regulatory pathway that bypasses traditional passenger type certification.
Hybrid-electric architecture and performance capabilities
The Zuri cargo VTOL utilizes a hybrid-electric powertrain featuring an in-flight generator, a design choice intended to overcome the range limitations of current battery technology. According to the Manufacturers, the hybrid system achieves an energy density of 1,500 watt-hours per kilogram at the system level. This compares favorably to current aviation batteries, which typically offer between 230 and 280 watt-hours per kilogram.
This power architecture enables a total useful load of 165 kg, which includes both payload and fuel. The aircraft is designed to carry a 115 kg payload across a maximum design range of 679 km. When factoring in a full 30-minute fuel reserve, the range with a 115 kg payload is 569 km. For shorter missions, the aircraft can transport a heavier 145 kg payload over a distance of 272 km.
Zuri also outlined a sensing configuration for the aircraft. By replacing cargo capacity with extra fuel tanks and sensor payloads, the VTOL can achieve an estimated range of 1,908 km. The aircraft operates at a cruise speed of 220 km/h.
Series A funding and flight test schedule
To bring the cargo variant to market, Zuri is raising a €6 million Series A first tranche. The company confirmed that €1.1 million has already been committed by existing investors in the current round. Since its founding, Zuri has raised a total of €7.6 million.
Zuri founder and CEO Michal Illich emphasized the culmination of the company’s research and development efforts in the official announcement.
“We spent nine years and more than fifteen aircraft teaching ourselves what this architecture can do. The uncrewed cargo VTOL is the first one we are building for someone else to fly. This round funds the demonstrator and its full flight test campaign.”
The company established its foundational architecture decisions, including tilting rotors and wing-borne cruise, in 2017. Zuri registered its first aircraft with the Civil Aviation Authority of the Czech Republic (CAA CZ) in 2018 and achieved full-scale hover with its initial technology demonstrator in 2021. Test-Flights for TD 2.0 is planned to begin in early 2027, with the company targeting first commercial deliveries of the cargo aircraft between 2027 and 2029.
Regulatory pathway and market positioning
Zuri intends to certify the uncrewed cargo VTOL under the European Union Aviation Safety Agency (EASA) Specific category. Operations will be risk-assessed using the Specific Operations Risk Assessment (SORA) framework. This approach allows the company to begin commercial operations without securing a traditional passenger type certificate.
According to reporting by Aviation Week on August 27, 2026, Zuri’s pivot to an uncrewed cargo platform is a strategic move to generate revenue faster while continuing to pursue its long-term ambition of developing a passenger aircraft. The market demand for such platforms has already been demonstrated. In November 2025, Aviation International News reported that Ambitious Air Mobility Group (AAMG) signed a binding investment agreement to back Zuri’s platform, which included forward orders for uncrewed and optionally piloted variants for logistics and defense applications.
AirPro News analysis
We view Zuri’s pivot to an uncrewed cargo variant as a pragmatic response to the current realities of the advanced air mobility sector. The capital requirements and regulatory timelines for certifying passenger-carrying eVTOLs have proven daunting for many Startups. By targeting the EASA Specific category and utilizing the SORA framework, Zuri is charting a much shorter path to commercial revenue.
Furthermore, the commitment to a hybrid-electric powertrain rather than a pure battery-electric system aligns with the practical needs of logistics operators. Pure Electric-Aviation struggle to offer the range required for offshore resupply or regional cargo transport. Zuri’s claimed 1,500 watt-hours per kilogram system-level energy density provides the operational flexibility that defense and civil logistics customers actually require, positioning the company well in a market segment that values payload and range over zero-emission marketing.
Sources: Zuri
Photo Credit: Zuri
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