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COMPONENTS AND OPERATION STEERING CONTROL UNIT The steering control unit (SCU) controls the electro-hydraulic steering valve to port hydraulic fluid to either end of the steering actuator to turn the nose gear. Hydraulic pressure will move the rack, which in turn engages and rotates the pinion gear on the steering cuff. Mechanical torque links transmit the movement of the steering cuff to the nose landing gear axle. Nosewheel feedback is sent to the SCU from transducers mounted on the steering actuator. The SCU continuously monitors the NWS. Fault detection results in steering system shutdown. Any faults detected are annunciated as CAS messages. When the steering system is shutdown or disarmed, the SCU reverts the nosewheel steering to free-castering mode. WARNING: -Prior to taxi, ensure that the nosewheel assembly is clear of personnel and towing equipment before selecting the nosewheel steering to the on position. The system is operable when: -Left hydraulic system is pressurized -Nose landing gear is down -The locked and a weight-on-wheels signal is present -NWS selected on Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6 15-01-15 STEERING CONTROL SYSTEM STEERING ACTUATORS STEERING HANDWHEEL CFO1501002_020 The EICAS landing gear indications provide the pilots increased situational awareness regarding the position and condition of the landing gear. LANDING GEAR DOWNLOCKED “SAFE”: LANDING GEAR UP: GEAR UP AND NO GEAR WARNING AND GEAR DISAGREE GEAR UP AND GEAR WARNING LANDING GEAR IN TRANSIT: CFO1501002_021
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