USA engineers have solid experience and expertise in maintaining 3,000 psi, variable flow rate hydraulic systems that supply hydraulic power to actuators and other end effectors. Their depth of knowledge ensures quick and effective methods and procedures for troubleshooting system anomalies.

USA's employees also provide expert sustaining engineering for auxiliary power units that supply high torque output for hydraulic pumps. These compact turbine engines extract stored chemical energy from hydrazine, using a catalyst to decompose the propellant. USA engineers sustain the fuel storage system, water cooling, electronic controllers, heaters and operational procedures and rules.

Similarly, USA engineers provide sustaining engineering for hydrogen/ oxygen propulsion systems, mechanical and pneumatic valves, wiring, heaters, and electronic controllers. They also sustain high pressure hypergolic propulsion systems, troubleshooting complex, interconnected system plumbing and related inert gas systems that are used to maintain propellant pressure. USA engineers sustain the cryogenic hydrogen and oxygen system storage tanks, distribution system plumbing and components, and the hypergolic storage and pressurization systems tanks, plumbing and heater systems.