Abstract: A Protection Barrier adapted to provide a barrier between an aircraft propeller on one side, and an engine on the opposite side is disclosed. The protection barrier isolates a technician from a rotating propeller while performing engine maintenance, such as adjustments during an aircraft run-up procedure. The Protection Barrier includes a frame assembly supporting dual panels in an elevated position independently adjustable vertically, laterally, and for inclination.

Abstract: A power system, comprising: a primary power source in electrical communication with a bus and a bridging power source, wherein the bridging power source comprises at least one of a capacitor, a battery, and an electrolysis cell, and the bridging power source is in electrical communication with the bus; and a secondary power source in electrical communication with the bus. A method for operating a power system, comprising: monitoring a primary power source; if the primary power source exhibits selected characteristics, directing power from a bridging power source to a bus and initiating a secondary power source, and the bridging power source comprises at least one of a capacitor, a battery, and an electrolysis cell; and unless the secondary power source exhibits the selected characteristics, powering the bus with the secondary power source and ceasing the directing power from the bridging power source.

Abstract: A system for providing back-up power to a load powered by a primary power source comprises: a fuel cell arrangement for generating back-up power for the load, a bridging power source for generating bridge power for the load, and a controller in operable communication with the fuel cell arrangement and the bridging power source. The controller is adapted to initiate application of the bridge power to the load upon detecting a deterioration of power from the primary power source, and is further adapted to initiate application of the back-up power to the load upon detecting a power capability of the back-up power to power the load.

Abstract: A regenerative fuel cell system is provided having at least one hydrogen storage container fluidly coupled to at least one hydrogen generator and at least one power generator. Each power generator further includes a fuel cell fluidly coupled to the hydrogen storage container, an electric energy storage device, and an unregulated dc bus electrically connected to said fuel cell and said electric storage device. The system further provides for a health monitoring system for determining the occurrence of critical events which may necessitate the disabling of the system.

Abstract: A power system, comprising: a primary power source in electrical communication with a bus and a bridging power source, wherein the bridging power source comprises at least one of a capacitor, a battery, and an electrolysis cell, and the bridging power source is in electrical communication with said the; and a secondary power source in electrical communication with the bus. A method for operating a power system, comprising: monitoring a primary power source; if the primary power source exhibits selected characteristics, directing power from a bridging power source to a bus and initiating a secondary power source, and the bridging power source comprises at least one of a capacitor, a battery, and an electrolysis cell; and unless the secondary power source exhibits the selected characteristics, powering the bus with the secondary power source and ceasing the directing power from the bridging power source.