Monopropellant driven hydraulic pressure supply

A method of actuating a hydraulically operated device, comprising:

• exhausting, in response to a first demand to actuate the hydraulically operated device, a first volume of pressurized hydraulic fluid from a pressure supply device, the pressure supply device comprising an elongated body having an internal bore extending from a power end to a discharge end having a discharge port in fluid communication with the hydraulically operated device, a piston movably disposed in the internal bore, a hydraulic fluid disposed in the internal bore between the piston and the discharge end, and a gas generator comprising a monopropellant and a decomposition catalyst operationally connected to the power end of the internal bore, wherein the exhausting the first volume of pressurized hydraulic fluid comprises activating the gas generator;
• receiving, by the hydraulically operated device, the exhausted first volume of the pressurized hydraulic fluid;
• and
• actuating the hydraulically operated device to a first position in response to the receiving the exhausted first volume of the pressurized hydraulic fluid by the hydraulically operated device.