Rudder Pedal Steering Mechanism Schematic 500
32-51-0 Figure 4 (Sheet 1) May 15/67
Page 8
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Rudder Pedal Steering Mechanism Schematic
May 15/67 Figure 4 (Sheet 2) 32-51-0
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Rudder Pedal Steering Mechanism Schematic 500
32-51-0 Figure 4 (Sheet 3) May 15/67
Page 10
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
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 hydraulic pressure available from the landing gear down line to the steering metering valve for steering. 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 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 piston position system when the nose gear is compressed. The compression movement is transmitted by linkage and cables to move the eccentric and reposition 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.
500
May 15/67 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-51-0 Page 11
NOSE WHEEL STEERING SYSTEM - TROUBLE SHOOTING
1. Prepare for Trouble Shooting
A. Jack nose wheels.
B. Place greased plates under nose wheels.
C. Lower airplane.
D. Place landing gear handle in DN position.
E. Pressurize hydraulic system A per 29-11-0, Hydraulic System A - Maintenance Practices.
2. Trouble Shooting Charts
WARNING: TO PREVENT PERSONNEL INJURY OR EQUIPMENT DAMAGE DURING INTERNAL LEAKAGE CHECKS, KEEP PERSONNEL AND EQUIPMENT CLEAR OF HYDRAULIC COMPONENTS THAT CAN MOVE.
500
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500
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500
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500
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500
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NOSE WHEEL STEERING SYSTEM - ADJUSTMENT/TEST
1. Nose Wheel Steering System Adjustment
A. General
(1) Adjustment of the nose wheel steering system consists of rigging the nose wheel steering cables and the nose gear piston position cables. The steering system is rigged to operate the steering metering valve by either the steering wheel or rudder pedal steering. In general, cables require rigging when tension values deviate from the values given in Table I of Fig. 501 more than (+15/-5) pounds. Cable temperatures should be allowed to stabilize at least 1 hour before attempting rigging and/or checking the cable tension.
B. Nose Wheel Piston Position System Adjustment
(1)
Equipment and Materials
(a)
Rigging Pins - 5/16-inch diameter, Type MS20392 (4 required)
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本文链接地址：737 AMM 飞机维护手册 起落架 LANDING GEAR(170)
