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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
ACTUATOR
ACTUATOR

CONDITION 1.
ACTION OF RUDDER PEDAL STEERING MECH. WHEN USED FOR STEERING. CLUTCH ARM RIDES ON STOPS ON STEERING CRANK. QUADRANT AND CLUTCH ARM WORK TOGETHER AND ARE DRIVEN BY ACTION OF STEERING CRANK.
Rudder Pedal Steering Mechanism Schematic Figure 4 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

ACTUATOR
ACTUATOR
STEERING RIGHT USING STEERING WHEEL CONDITION 2.
ACTION OF RUDDER PEDAL STEERING MECH. WHEN NORMAL STEERING IS USED. CLUTCH ARM RIDES ON STOPS ON STEERING ARM. QUADRANT, ETC. ARE DRIVEN BY CABLE ACTION.
Rudder Pedal Steering Mechanism Schematic Figure 4 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

RUDDER PEDAL

STOP
STOP
CONDITION 3.
ACTION OF RUDDER PEDAL STEERING WITH NOSE GEAR EXTENDED AND CLUTCH ARM RIDING ON STOPS ON CLUTCH CRANK. STEERING CRANK IS FREE TO MOVE WITH RUDDER MOVEMENT AND DOES NOT CONTACT CLUTCH ARM. CLUTCH CRANK WITH STOPS MOVED INTO CONTACT BY ACTION OF DRUM AND ECCENTRIC.
Rudder Pedal Steering Mechanism Schematic
Figure 4 (Sheet 3)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 6.  Operation
_________
 A.  Nose wheel steering is available when the nose gear is in the down position and compressed by weight of the airplane. Positioning the landing gear control lever to down makes system A hydraulic pressure availabe from the landing gear down line to the steering metering valve for steering. On some airplanes, in the event of loss of system A pressure, the alternate nose wheel steering system can be activated to provide system B pressure to the nose wheels. A select switch on the captain's forward panel allows the flight crew to activate the alternate steering system. The nose gear must be compressed more than two inches before steering is attempted to avoid damage to the centering cams.
 B.  When the steering wheel is rotated for a turn, the steering cables move and displace the steering metering valve piston. Hydraulic fluid is directed by the metering valve through the swivel valves to the steering actuators. The steering actuators produce a turning moment on the steering collar which is transmitted by the torsion links to the lower steerable portion of the nose gear. Continued displacement of the metering valve piston combined with the steering actuator swivel valves produces 78 degrees of wheel turn for 95 degrees of steering wheel rotation. During a turn, the metering valve piston is displaced until the required degree of nose wheel turning is reached and then returned to the center position by the follow-up action of the cable.
 C.  Nose wheel steering is also available through the rudder pedals. The rudder pedal steering mechanism is actuated by the squat switch/electric actuator system when the nose gear is compressed. The compression movement is transmitted electrically to move the eccentric and repositon the clutch crank and allow the clutch arm to contact the stops mounted on the steering crank. In this position, any movement of the rudder pedals is transmitted from the steering arm to the quadrant. The quadrant moves the nose wheel steering cables displacing the steering metering valve piston for the required turn.
　
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