Liquid oxygen is added in an oxygen mole fraction exists in the test medium.
The remote location of the facility plus the straight line ejector exhaust configuration, allows for unique test capabilities. For example, test article hardware separation, i.e. releasable model shrouds, is allowed. The facility is also sited for 10,000 pounds of Class 1.3 explosives. This air storage system is also the source for an annular air ejector, located in the exhaust duct, which is used to lower the test cell pressure to obtain various altitude simulations. APTU Free-Jet Exhauster Auxiliary air ejectors have been installed to augment the pumping capacity of the original air ejector.