Aircraft automatic braking system having auto-brake control logic

Claim 1

An aircraft automatic braking system comprising in combination: first means for providing a brake pressure control signal; automatic braking pressure modulating valve means responsive to said brake pressure control signal for metering automatic braking pressure to first shuttle valve means for application of brakes on one side of the aircraft and second shuttle valve means for application of brakes on the other side of the aircraft; first manually controlled pressure metering valve means coupled to said first shuttle valve means and second manually controlled pressure metering valve mean coupled to said second shuttle valve means; shutoff valve means for transmitting hydraulic power to said automatic braking pressure modulating valve means; and automatic brake control logic circuit means including: arming means for applying D.C. power to said first means, said arming means including arming switch means and arming relay means; a first arming circuit for energizing a first relay to interrupt holding power to said arming switch means and said arming relay means in response to a disarm signal thereby releasing automatic braking pressure; a second arming circuit for energizing a second relay and interrupting power coupled to a third relay in response to said disarm signal thereby releasing automatic braking pressure; ON-RAMP COMMAND logic circuit means coupled to said third relay for energizing said third relay when said first and second arming circuits are in an armed condition, thereby opening said shutoff valve and enabling said automatic braking pressure valve to regulate automatic braking pressure.