Aerojet Rocketdyne Test-Fires AR-22 At Stennis Space Center Written 5 July 2018

The AP reported that Aerojet Rocketdyne test-fired its experimental AR-22 rocket engine Monday at NASA’s Stennis Space Center in Mississippi. The engine is designed to be part of a “reusable spacecraft that can launch into space repeatedly with a quick turnaround time.” The Phantom Express spacecraft is a “collaboration between the Defense Advanced Research Projects Agency, Boeing and Aerojet Rocketdyne.” The AR-22 will be tested by engineers “over a 10-day period by firing it up for 100 seconds and then doing it again 24 hours later.” Monday is the sixth of a planned 10 test fires. Aerojet Rocketdyne’s Tom Martin described the test’s data as “exactly what we expected,” adding that the “engine did exactly what we were expecting it to.” According to DARPA’s Scott Wierzbanowski, Phantom Express utilizes many space shuttle technologies, specifically its main engine and thermal protection system. 
More Info (Associated Press)