13 REPLACE INNER CYLINDER ASSEMBLY.
Wear Limits of the Torsion Links For the Nose Landing Gear
Figure 602 (Sheet 4)

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747-400 MAINTENANCE MANUAL
 S 226-027
 (2)  
Do a check on the torsion links.

 (a)  
Measure the parts and compare the measured dimensions to the limit dimensions.

 (b)  
If a part is not in the tolerance, replace that part.

 S 426-028
 (3)  Install the torsion links (AMM 32-21-03/401).
 TASK 32-21-03-206-057
 4.  Free-Play Functional Check For The Torsion Link Of The Nose Landing Gear________________________________________________________________________ (Fig. 601)
 A.  Special Tools and Equipment
 (1)  
G32022-1 Test Equipment - Torsion Link Free Play Check, Nose Landing Gear

 (2)  
TE65B01202 Test Equipment - Nose Landing Gear Component Assembly (Jack Attachment Tool)

 (3)  
2MIT65B04011-41 Nose Gear Rig and Tow Safety Pin

 B.  
Standard Tools and Equipment

 (1)  
Indicator - Dial 25-441P; Universal Indicator Back - 672.2; Magnetic Base Indicator Holder - 657AA. L. S. Starrett Co., Athol, Massachusetts 01331

 (2)  
Gage - Dial Push/Pull model DPPH-100. John Chatillon and Sons Inc., 83-30 Kew Gardens Road, Kew Gardens, New York 11415

 C.  
References

 (1)  
AMM 07-11-02/201, Jacking Airplane Nose

 (2)  
AMM 09-11-00/201, Towing

 (3)  
AMM 12-15-05/301, Nose Landing Gear Shock Strut

 (4)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (5)  
AMM 32-00-30/201, Landing Gear Door Locks

 (6)  
AIPC 32-21-03 Fig. 1

 D.  
Access

 (1)  
Location Zone
 715 Nose Landing Gear

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747-400 MAINTENANCE MANUAL
 E. Prepare for the procedure
 S 866-055
 WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING
_______ GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1) Install the ground locks in all landing gear (AMM 09-11-00/201).
 S 496-056
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  
Do this task: "Installation of the Door Locks on the Nose Landing Gear" (AMM 32-00-30/201).

 F.
Procedure

 S 866-061
 (1)  
Make sure the airplane is empty (450,000 pound maximum) and in a hangar or in an open areas with light winds.

 S 866-062

 (2)  
Remove the hydraulic power from the system No. 1 (AMM 29-11-00/201).

 S 866-063

 (3)  
Lift the nose of the airplane with the fuselage jack until the dimension X on the NLG servicing chart (AMM 12-15-05/301) is approximately six inches (AMM 07-11-02/201).

 S 866-064

 (4)  
Deflate the shock strut for the nose landing gear.

 (a)  
Remove the air valve cap.

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