The nosewheel steering system is used to control the direction the aircraft moves during taxiing, take-off, and landing operations. The nosewheel steering is electronically controlled and hydraulically operated. Operation of the steering control handwheel (tiller) or movement of the rudder pedals will operate the nosewheel steering.

The steering system is electronically controlled and hydraulically operated. The steering system has a steering control handwheel (tiller), a steering control unit, and two steering actuators. The steering actuators are installed on the left and right sides of the nose landing gear shock strut. The steering actuators steer the aircraft during taxi, take-off, and landing operations. When the steering system is off or has failed, the steering system continues to operate as a shimmy damper.

Steering inputs to the steering control unit (SCU), through the steering control handwheel (tiller), give full travel to the actuators. The amount of travel is decreased when steering inputs to the SCU are through the rudder pedals. Nosewheel position feedback to the SCU is from two linear transducers installed on the steering actuators. The SCU controls the steering solenoid valve, which sends hydraulic pressure to the steering actuators. The steering actuators operate in a push/pull mode to move the steering collar. Mechanical torque links connect the steering collar to the nosewheel.

The steering system has the system that follows:

Nosewheel-Steering Control System

The pilot uses the NOSE STEER, ARMED/OFF switch on the landing-gear control panel to arm the nosewheel steering system. If the steering control unit (SCU) finds no malfunctions in the system, the steering system is made ready for use. If the SCU finds any malfunctions it will remove hydraulic power from the nosewheel-steering control system. If there is a hydraulic malfunction, the nosewheel-steering control system will let the NLG turn freely.

When the aircraft is on the ground, steering inputs are electronically sent to the steering control unit. Steering inputs are sent from the steering control handwheel (tiller). They are also sent from the rudder pedals. The steering control handwheel (tiller) controls the steering system through its full travel. The amount of travel is decreased to seven degrees on each side of neutral when the rudder pedals are used to control the steering. The steering control handwheel (tiller) gives artificial feel control, positive breakout from the neutral position, mechanical stops at full travel, and automatic return to center.

The nose landing gear has two steering actuators, one on the left and one on the right. The two actuators get inputs from the steering control unit and hydraulically turn the nosewheel to the necessary position.

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