Remotely Piloted Aircraft Help FAA Test ACAS X

Testing found that the technology’s “behavior and output” change between en route and terminal airspace.

Jack Daleo

Tuesday, April 07, 2026 at 02:45 PM ET

Verified

Edited By:

Zach Vasile

Reliable Robotics’ automated Cessna Caravan and Cessna 182 “intruder” aircraft sit on the tarmac at San Martin Airport (E16) in California. [Credit: Reliable Robotics]

Key Takeaways:

The FAA is collaborating with Reliable Robotics on flight tests using remotely piloted aircraft to develop crucial certification standards for large uncrewed aircraft systems (UAS) weighing over 55 pounds, which currently lack specific regulations.
Reliable Robotics' Detect and Avoid (DAA) system, based on FAA's ACAS Xu technology and equipped with radar and sensors, was successfully tested in over 50 simulated encounters to ensure safe separation from both cooperative and non-cooperative aircraft.
The real-world data gathered from these tests is vital for the FAA and standardization bodies to create robust DAA and ACAS Xr (for rotorcraft/eVTOL) standards, enabling the safe integration of autonomous aircraft into airport environments and various airspace.
This effort is part of Reliable Robotics' broader goal to achieve full flight autonomy and secure certification for large UAS operations, with ongoing partnerships and future demonstrations aimed at providing regulators with valuable real-world insights.

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Remotely piloted aircraft are flying in and around airports to help the FAA develop certification standards for large uncrewed aircraft systems (UAS).

The data collection flights in and around the terminal area of Hollister Municipal Airport (KCVH) in California are intended to guide the FAA and standardization bodies in their quest to safely integrate larger UAS models. The FAA has regulations for small UAS, such as delivery drones, but they do not cover models weighing over 55 pounds.