Abstract: This invention relates to an aircraft braking system which applies and regulates brake pressures automatically upon touchdown to achieve a pre-selected airplane deceleration level. Wheelspeed information signals are processed through wheelspeed logic circuits to provide an input to automatic brake control circuits having further logic circuits which, when satisfied by the presence of other signals, cause further automatic brake control circuits including a ramp generator circuit to generate control signals which are coupled in parallel with the anti-skid system to control the anti-skid valve driving current below skid levels so that braking pressure is increased at a controlled rate to achieve the above-mentioned pre-selected airplane deceleration level.

Abstract: A valving system for regulating the pressure of the fluid within a hydraulic actuator of the type having a hydraulic cylinder and movable piston therein that separates the cylinder into a first and second chamber comprises sensing apparatus in fluid communication with the first chamber of the hydraulic actuator cylinder. The sensing apparatus senses the differences in pressure between the fluid within the first chamber and the fluid in the second chamber. The valving system further includes a pressure regulator for regulating the pressure within the first chamber in response to the sensed pressure difference. Apparatus is also included for communicating the magnitude of the sensed pressure difference to the pressure regulator.