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: An aircraft brake control system responsive to air-ground condition of the aircraft, nose gear analog wheel speed, and main gear analog wheel speed for providing brake release signals to deactivate main gear wheel braking in the event of the occurrence of any of the following conditions: (1) locked main gear wheel; (2) nose gear wheel is off the ground and main gear wheel is not spinning; (3) nose gear wheel is on the ground but main gear wheel is locked; and (4) nose gear wheel is on the ground but main gear wheel speed is about 50 percent below nose gear wheel speed.