WARNING:_______ DO NOT LOOSEN THE AIR VALVE BODY UNLESS YOU FULLY DEFLATED THE SHOCK STRUT. THE INTERNAL PRESSURE CAN BLOW THE VALVE OUT. THIS WILL CAUSE INJURY TO PERSONS.
 (b)  Loosen the air valve nut two turns maximum.
 NOTE:____ The fluid in the shock strut will release bubbles immediately when you decrease the pressure. Deflate the shock strut slowly to prevent a flow of fluid through the air valve.
 (5)  S 426-066Install the jack attached tool to the bottom of the axle.
 (6)  S 426-067Put the axle jack below the inner cylinder of the nose landing gear.
 (7)  S 416-068Lift the inner cylinder with the axle jack until the dimension X on the NLG servicing chart (AMM 12-15-05/301) is 4 |0.25 inches. (a) Make sure the nose gear tires are off the ground. (b) Adjust the fuselage jack and the axle jack if it is necessary.
 (8)  S 416-069Install the tow pin at the summing mechanism to move away the hydraulic pressure from the metering valve (AMM 09-11-00/201).
 (9)  S 416-070Install the torsional play tool.
 NOTE:____ The torsional play tool has 4 parts. these parts. Figure 601, Sht 2 shows
 (a) (b) (c)  Install the lock assemblies (Parts 3 and 4) on the steering actuators.Install the dial indicator to read the axle nut motion.Install the torsional play tool into the jack attached tool. 1) Install the bare end of the reversible extension assembly (Part 2) into the jack attached tool. 2) Make the hole larger in the jack attached tool if it is necessary.
 NOTE:____ The reversible extension assembly is installed 5.00 inches into the jack attached tool. This distance is the distance from the end of the extension assembly to the outer edge of the stop collar.
 3)  Install the small end of the lever arm (Part 1) into the free end of the reversible extension assembly.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-21-03
 ALL  ú ú 01 Page 614 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (d)  Install the push and pull gage at the BLUE location on the lever arm (Part 1).
 S 866-071
 (10)
 Measure the play.

 (a)  
Apply a 50 |10 pound force in a left hand or right hand direction to the push and pull gage.

 (b)  
Set the dial indicator to zero.

 (c)  
Apply the same force in the opposite direction to the push and pull gage.

 (d)  
Write the reading from the dial indicator.

 (e)  
Release the loading force.

 S 966-072
 (11)
 If the torsional play is 0.19 inch or more, replace the torsion link bushings and the torsion link parts.

 S 866-073

 (12)
 Do a second play check and write the indication from the dial indicator.

 S 966-074

 (13)
 If the torsional play stays more than 0.19 inch, replace the steering actuators or other components.

 G.
Put the airplane back to its usual condition.

 S 086-073
 (1)  
Remove the torsional play tool.

 S 086-074

 (2)  
Remove the axle jack.

 S 086-075

 (3)  
Remove the jack attached tool from the bottom of the nose gear axle.

 S 866-076

 (4)  
Lower the nose of the airplane (AMM 07-11-02/201).

 (a)  
Remove the fuselage jack.

 (5)  
Do a servicing on the shock strut (AMM 12-15-05/301).

 S 616-077
 S 096-059
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ DOOR LOCKS FROM THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (6)  Remove the door locks for the nose landing gear if no more work on the airplane is necessary (AMM 32-00-30/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-21-03
 ALL  ú ú 01 Page 615 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 起落架 LANDING GEAR 3(136)