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Not Available An available source of pure oxygen, usually in the form of high pressure oxygen gas in storage cylinders, is especially important for military aircraft crews. On-board generation of high- pressure oxygen gas can decrease the ground support requirements for military (and commercial) aircraft by reducing the need for high-pressure oxygen transfer cylinders. Following preflight validation and in-flight qualification, the proposed oxygen trickle charger may be used to automatically replace oxygen in storage cylinders that has been consumed by aircrew personnel and/or lost through system leaks. The use of a water electrolyzer system as a trickle charger is ideal since the oxygen is generated from easily obtained consumables (electricity and a small amount of water). Such a system may be arbitrarily cycled on and off, oxygen generation and pressurization is accomplished with a minimal number of moving components, and the system is essentially maintenance free. The proposed system is compatible with the rigors of flight, including altitude, temperature extremes, orientation, dynamic loading, and is fully capable of performing real-time on-board diagnostics. In addition, the system is compact, lightweight, reliable, has a relatively low electrical power demand, and requires no special handling. This Phase I project will result in the development and performance testing of a breadboard electrolyzer oxygen generation system having an output of 0.5 liters per minute at a pressure of 500 psi. The system will be tested at temperature extremes including starting from a frozen state. In preparation for the development of a high pressure system (2500 psi) in Phase II, critical design aspects will be addressed as part of the Phase I effort.