Space & Satellites
Isar Aerospace Opens Acceptance Test Facility at Esrange Space Center
Isar Aerospace launches a new test site at Esrange, Sweden, to support industrial-scale production of Spectrum rocket ahead of March 2026 flight.
This article is based on an official press release from Isar Aerospace.
Isar Aerospace has officially inaugurated a new acceptance test facility at the Esrange Space Center in Kiruna, Sweden. Announced on February 4, 2026, the opening marks a significant transition for the Munich-based launch provider as it shifts focus from prototype development to the industrial-scale production of its Spectrum launch vehicle.
The new site is purpose-built to verify the flight readiness of manufactured hardware, a critical step in ensuring high-cadence Launch operations. According to the company, the facility is designed to test over 30 Aquila engines per month, alongside fully integrated rocket stages. This infrastructure expansion comes just weeks before Isar Aerospace attempts its second Test-Flights, mission “Onward and Upward,” scheduled to First-Flight from Andøya Spaceport in Norway in March 2026.
Industrializing Launch Capabilities
Unlike development testing, which focuses on validating design concepts, acceptance testing is the final quality control step before hardware is shipped to the launch pad. Isar Aerospace stated in their press release that the new facility is specifically engineered to remove production bottlenecks. By securing dedicated infrastructure for acceptance testing, the company aims to ensure that every engine and stage coming off the assembly line is immediately qualified for flight.
The facility operates alongside Isar’s existing vertical test stand (VTS-2) at Esrange, which has been utilized for development testing since 2019. The addition of the new site allows for parallel operations: R&D can continue on the vertical stand while the new facility handles the volume required for serial production.
“Scaling reliable access to space requires not only advanced launch vehicle design but also the right infrastructure to support rapid development and production. With our second test facility at Esrange, we are unlocking new capabilities and accelerating our progress.”
, Daniel Metzler, CEO & Co-Founder, Isar Aerospace
Capacity and Specs
The new infrastructure significantly increases the company’s throughput. Isar Aerospace reports that the site is equipped to handle the acceptance testing of more than 30 Aquila engines monthly. Furthermore, the site supports integrated stage testing, allowing engineers to verify the entire rocket stage as a cohesive unit before it leaves Sweden.
Strategic Context: The Race for European Sovereignty
The opening of this facility highlights the intensifying race among European launch Startups to provide sovereign access to space. Isar Aerospace is competing with peers such as Rocket Factory Augsburg (RFA) and Orbex to fill the gap in Europe’s launch market. By vertically integrating its testing capabilities, Isar Aerospace reduces reliance on shared facilities, potentially giving it an advantage in scheduling and launch cadence.
Swedish Space Corporation (SSC), which operates Esrange, emphasized the importance of this Partnerships for the broader European ecosystem.
“This new facility strengthens Europe’s path toward scalable and reliable access to space… Together, we are building the infrastructure that will enable a new generation of launch services.”
, Mats Tyni, Director of Business Development, SSC
AirPro News Analysis
The distinction between “development” and “acceptance” testing is often overlooked, yet it is the primary hurdle for launch companies moving from a single successful flight to a commercial service. In our view, Isar Aerospace’s Investments in a high-volume acceptance facility signals confidence in their hardware design. It suggests the company believes the Aquila engine design is mature enough to freeze for mass production. If the upcoming March 2026 flight is successful, this infrastructure will be the key enabler that allows them to fulfill their backlog without the testing bottlenecks that have historically plagued the industry.
Upcoming Mission: “Onward and Upward”
The facility inauguration serves as a prelude to Isar Aerospace’s next major milestone. The company confirmed that its second test flight, dubbed “Onward and Upward,” is targeted for a launch window in March 2026. This mission will utilize the Spectrum vehicle, a two-stage rocket designed to carry up to 1,000 kg to Low Earth Orbit (LEO).
The Spectrum vehicle relies on the Aquila engines tested at Esrange, which utilize Liquid Oxygen (LOX) and Propane. Following a flight termination during the first test launch in March 2025, the company has conducted extensive hot-fire tests to validate system corrections. The new acceptance facility will likely play a central role in qualifying engines for vehicles 3 through 7, which are currently planned for concurrent production.
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Photo Credit: Isar Aerospace