Patent ID: 8118256
Filing Date: 2012-02-21
Classification: B60T,B64F

Abstract:
1. A brake system for applying a braking force to a rotatable wheel of an aircraft, comprising: a brake-disk stack; at least one brake actuator for applying and releasing a force on the brake-disk stack so as to effect a braking force on the wheel; a shutoff valve having an input port for receiving fluid pressure and an output port for outputting fluid pressure, the shutoff valve configured to selectively enable or inhibit the transmission of fluid pressure from the input port to the output port; at least one control valve operatively coupled to the shutoff valve output port and the at least one brake actuator, the at least one control valve configured to control a supply of fluid pressure from the shutoff valve to the at least one brake actuator; and a controller operatively coupled to the at least one control valve, the controller configured to determine whether the shutoff valve should be in an inhibited state, command, in response to a determination that the shutoff valve should be in the inhibited state, the at least one control valve to apply fluid pressure to the at least one actuator, and determine an operational status of the shutoff valve based on the absence or presence of wheel braking.