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does not have hydraulic system pressure.
A towing lever on the steering metering valve module controls a
towing shutoff valve.
NOSE WHEEL STEERING SYSTEM - SUMMING MECHANISM AND STEERING METERING VALVE MODULE
EFFECTIVITY
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The swivel valves control hydraulic flow to the two sides of the
steering actuators.
Functional Description
Steering wheel or rudder pedal input moves the summing
mechanism from the neutral position. This makes an input to
the steering metering valve module that sends pressure to the
nose wheel steering actuators. The nose wheel steering
actuators turn the nose landing gear wheels.
The movement of the nose gear wheels moves the summing
mechanism back towards the neutral position. When the nose
landing gear wheel position agrees with the steering wheel or
rudder pedal position, the summing mechanism moves the
metering valve to the neutral position. This stops the flow to the
nose wheel steering actuators.
A towing lever lets you depressurize the nose wheel steering
system. Because of this, you do not have to depressurize
hydraulic system A to tow the airplane.
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NOSE WHEEL STEERING SYSTEM - SUMMING MECHANISM AND STEERING METERING VALVE MODULE
NOSE WHEEL STEERING SYSTEM - SUMMING MECHANISM AND STEERING METERING VALVE MODULE
EFFECTIVITY
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Purpose
The hydraulic steering actuators move the steering collar to
turn the nose wheels.
The steering collar transmits steering torque through the upper
and lower torque links to the inner cylinder of nose landing
gear.
Location
The steering actuators are trunnion-mounted between the
upper and lower steering plates. Each actuator is connected
to a swivel valve at one end and the steering collar at the other
end.
The steering collar is bearing-mounted around the nose gear
shock strut outer cylinder. The torsion links connect the steering
collar to the shock strut inner cylinder.
Physical Description
The steering actuators are unbalanced piston type actuators.
Each actuator can swivel left or right. The rod ends of the
actuators are connected to the steering collar.
Functional Description
The steering actuators get hydraulic pressure from the landing
gear hydraulic system and supply steering forces to turn the
steering collar.
The steering collar transmits the actuator steering forces,
through the torsion links and shock strut inner cylinder, and to
the nose landing gear wheels.
NOSE WHEEL STEERING SYSTEM - STEERING ACTUATORS AND STEERING COLLAR
EFFECTIVITY
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NOSE WHEEL STEERING SYSTEM - STEERING ACTUATORS AND STEERING COLLAR
NOSE WHEEL STEERING SYSTEM - STEERING ACTUATORS AND STEERING COLLAR
EFFECTIVITY
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General
The nose wheel system uses landing gear down pressure to
turn the nose landing gear wheels.
Steering inputs from the steering wheel or rudder pedals go
though the control cables to the metering valve. This makes an
input through the summing mechanism to move the steering
metering valve. This lets hydraulic pressure go through the
swivel valves to the steering actuators.
The actuators get pressure on the extend side, the retract side,
or both sides to move the nose landing gear wheels from 0 - 78
　
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