Abstract: A pressure regulating valve controller for controlling the flow of refrigerant airflow through one of a plurality of air cycle systems is described. The controller includes pressure regulating means (145) for controlling flow in response to changes in ram air temperature as well as pressure regulating means (140 and 315) in response to the number of operating air cycle systems.

Abstract: An anti-ice control system for controlling flow of heated air in response to the temperature of the heated air and ambient air.

Abstract: Fluid temperature control system for providing a supply fluid at a select temperature by warming or cooling a first fluid with a controlled flow of a second fluid. The control of the second fluid flow is achieved by a modulation valve adjustable in response to the pressure of a supply of servo fluid which is itself adjusted in response to the temperature of the supply fluid. The adjustment of the servo fluid pressure by the control system is such that the change in servo fluid pressure from a steady state condition is initially great, diminishing with time to a lesser, steady state value, thereby enhancing the transient response of the control system.

Abstract: A temperature control system safely and efficiently protects critical aircraft surfaces from reaching fuel auto ignition temperature with cooling provided by a relatively small and light heat exchanger.

Abstract: A temperature control system safely and efficiently protects critical aircraft surfaces from reaching fuel auto ignition temperature with cooling provided by a relatively small and light heat exchanger.