(3)
Whenever the nose gear steering hydraulic system is opened for servicing, it is important that the system be bled completely to assure effective shimmy damping. This can be accomplished by pressurizing the A hydraulic system per Chapter 29, and exercising the steering system through at least 15 complete cycles from full left to full right.
B. Equipment and Materials
(1)
Nose Gear Rigging Protractor - TE65-73762 or F80184-1
(2)
Stop watch
(3)
Spring scale - calibrated from 0 to 25 pounds
(4)
Greased turning plates to allow nose wheels to steer
(5)
Ground Lock Assembly (Ref 32-00-01)
500
32-51-0 Page 506 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 20/91
C. Prepare to Test Nose Wheel Steering System
(1)
Check that ground lock assembly is installed in nose gear (Ref 32-00-01).
(2)
Jack nose wheels of airplane using axle jack until nose gear tires clear ground (Ref Chapter 7).
(3)
Remove retaining bolt from upper torsion link pin.
(4)
Install nose gear rigging protractor and adjust protractor to zero with shock strut centered by aligning marker on steering collar with marker on steering collar bearing.
(5)
Position greased turning plates under nose gear tires and lower airplane so that weight of airplane is supported by landing gear.
(6)
Pressurize hydraulic system A (Ref 29-11-0, MP).
(7)
Check that nose gear does not attempt to steer when hydraulic system A is pressurized.
D. Test Nose Wheel Steering System
(1)
Check that steering wheel is in neutral (centered) position.
(2)
Check that rudder pedals are in neutral position.
NOTE: When performing steps (1) and (2), use rigging pin holes for alignment reference but do not leave any rigging pins installed.
Oct 20/84 32-51-0 Page 507
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Nose Wheel Steering Adjustment 500
32-51-0 Figure 501 (Sheet 1) May 15/69
Page 508
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Nose Wheel Steering Adjustment
Sep 15/70 Figure 501 (Sheet 2) 32-51-0
Page 509
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Nose Wheel Steering Adjustment 500
32-51-0 Figure 501 (Sheet 3) Feb 20/84
Page 510
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(3)
Rotate steering wheel counterclockwise to left stop position and hold.
(a)
Check that nose gear steers to left 78 (+1/-2) degrees.
(b)
Check that the piston position spring cartridge clears all structure throughout travel.
NOTE: It is permissible for the spring cartridge rod ends to contact the inner surfaces of mating clevises.
(c)
Check that steering piston rods clear steering collar at all nose gear piston positions.
(d)
Check that all pulleys, quadrants, and components are operating freely and that there is no evidence of binding or galling throughout the system.
(4)
Release steering wheel.
(a)
Check that steering wheel returns to neutral position.
(b)
Check that nose gear returns to centered position within + 1-1/4 degrees.
(5)
Rotate steering wheel clockwise to right stop position and hold.
(a)
Check that nose gear steers to right 78 (+1/-2) degrees.
(b)
Repeat steps (3)(b) through (3)(d) for nose gear right.
(6)
Release steering wheel.
(a)
Check that steering wheel returns to neutral position.
(b)
Check that nose gear returns to centered position within + 1-1/4 degrees.
(7)
Rotate steering wheel counterclockwise sufficiently to steer nose gear left 70 (+ 5) degrees and hold.
(8)
Attach spring scale to steering wheel and check that load on steering wheel rim required to initiate further left steering to 78 (+1/-2) degrees does not exceed 13 pounds.
(9)
Repeat steps (7) and (8) but steer nose gear to right. Result should be same.
(l0) Remove spring scale from steering wheel.
(11)
Rotate steering wheel as rapidly as possible counterclockwise to left stop position and hold.
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：737 AMM 飛機維護手冊 起落架 LANDING GEAR(173)
