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Cable quadrant arm
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Rudder pedal arm
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Free arm assembly (2)
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Roller (2)
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Centering spring (4).
The cable quadrant and cable quadrant arm are one assembly. The cable quadrant attaches directly to the upper cable loop.
The rudder pedal arm is directly below the cable quadrant arm and connects through a rod to rudder system forward control components.
EFFECTIVITY
BEJ ALL
A roller attaches to each of the free arm assemblies. The rollers can touch the cable quadrant arm and the rudder pedal arm.
Two centering springs are above and two centering springs are below (not shown) the cable quadrant arm. The springs are connected to the two free arm assemblies.
The cable quadrant and cable quadrant arm, the rudder pedal arm, and the free arm assemblies pivot about the same point.
Location
The NLG steering centering and rudder interconnect mechanism is below the flight deck floor. You get access to the mechanism through the forward equipment center access door.
Neutral Position
When the tillers and the rudder pedals are in the neutral position, the centering springs keep or return the cable quadrant and cable quadrant arm to the centered position. This keeps the upper cable loop and the nose gear steering system in the centered position.
32-51-00
Page 9 D633W101-BEJ Sep 05/2002
NOSE GEAR STEERING SYSTEM -NLG STEERING CENTERING AND RUDDER INTERCONNECT MECHANISM
Tiller Inputs
Tiller inputs move the upper cable loop. The upper cable loop directly moves the cable quadrant and cable quadrant arm. The cable quadrant arm pushes on one of the two rollers. This causes one of the free arm assemblies to move and pulls on the centering springs.
The centering springs pull the other free arm assembly and roller against the rudder pedal arm.
The rudder pedal arm does not move because the rudder pedal centering force (from springs in the rudder system forward control components) is greater than the force that pulls on the centering springs. This causes the centering springs to extend.
The result is that the tiller input moves the cable quadrant to make a steering input but the rudder system does not get an input.
Rudder Pedal Inputs
Rudder pedal inputs through the rudder system forward control components move the rudder pedal arm. This arm pushes against one of the two rollers and moves one of the free arm assemblies. The centering springs pull on the other free arm assembly and roller. If the nose landing gear is in the extended position, the roller pushes and moves the cable quadrant arm, the cable quadrant, and the upper cable loop. This results in a nose gear steering input.
The upper cable loop motion moves the steering tillers.
If the nose landing gear is in the retracted position, the upper cable loop is locked. This also locks the cable quadrant and quadrant arm. Rudder pedal inputs will then cause the centering springs to extend.
Training Information Point
Rig pin holes in the mechanism keep the system in the neutral position during cable rigging.
EFFECTIVITY BEJ ALL 32-51-00
Page 10
D633W101-BEJ Sep 05/2002
NOSE GEAR STEERING SYSTEM -NLG STEERING CENTERING AND RUDDER INTERCONNECT MECHANISM
EFFECTIVITY BEJ ALL 32-51-00
Page 11
D633W101-BEJ Jan 05/2002
NOSE GEAR STEERING SYSTEM -NLG STEERING BROKEN CABLE COMPENSATOR
Purpose
The NLG steering broken cable compensator protects the steering system from inputs caused by a break in the upper cable loop.
Physical Description
These are the NLG steering broken cable compensator components:
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Two pulleys
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Two force links
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A roller
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An output cam and shaft.
The pulleys are bearing-mounted on the output shaft. A roller connects to each of the pulleys by force links. The output cam attaches to the output shaft.
Location
The NLG steering broken cable compensator is on the aft side of the nose gear wheel well rear bulkhead in the main equipment center.
The output shaft of the broken cable compensator goes through the bulkhead into the wheel well.
Functional Description
Tension in the upper cable loop pulls on the force links. This keeps the roller in the output cam and permits cable motion to move the output cam.
A break in the upper cable loop causes tension to be lost in one cable. Asymmetric tension moves the roller out of the cam detent. This stops all steering inputs.
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