747-400
MAINTENANCE MANUAL

NOSE GEAR

49 X 17 TIRE  49 X 19-20 TIRE 
CONDITION  (INCHES) A  (INCHES) B  (INCHES) A  (INCHES) B 

AIRPLANE AT MAX TAXI WEIGHT TIRES NORMALLY INFLATED  20.0  16.0  20.0  13.5 
AIRPLANE AT MAX TAXI WEIGHT BOTH TIRES FLAT  13.5  13.0  14.0  10.5 
AIRPLANE AT MAX TAXI WEIGHT ON WHEEL RIMS  10.5  19.0  10.5  19.0 
AIRPLANE ON JACKS - HIGH ENOUGH FOR TIRE CHANGE  26.0  18.0  26.5  16.0 

NOTE:THE DIMENSIONS GIVEN IN THE TABLE ABOVE ARE APPROXIMATE
AND WILL BE DIFFERENT ON DIFFERENT TIRE TYPES AND CONDITIONS.

Jack Pad Locations - Axle Jacking
Figure 201 (Sheet 2)

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 ú  01  Page 203
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 B.

C.
D.
E.
F.
A
747-400 MAINTENANCE MANUAL
 (1)
Obey these warnings and cautions during all of this task.Special Tools and Equipment

 (1)  
8ME65B01202-3 Landing Gear Shock Strut Retention Tool

 (2)  
6ME65B00161-1 Main Gear Ground Locks (4 required)

 (3)  
2ME65B01202-1 Nose Gear Ground Lock

 (4)  
MIT65B18229 MLG Auxiliary Jacking Bar

 (5)  
3MIT65B00162 Nose Gear Steering Lock Assembly (for use on airplanes with steering piston rod of 2.24-inch diameter)

 (6)  
MIT65B01562 Nose Gear Steering Lock Assembly (for use on airplanes with steering piston rod of 2.37-inch diameter)

 (7)
2MIT65B04011-41 Steering Lockout PinStandard Tools and Equipment

 (1)  
Adapters - Axle

 (2)  
Adapters - Jacking

 (3)
Block - InclinedReferences

 (1)  
09-11-00/201, Towing

 (2)  
12-15-06/301, Landing Gear Tire

 (3)  
32-00-30/201, Landing Gear Door Locks

 (4)
32-41-09/401, Hydraulic Brake AccumulatorAccess

 (1)  
Location Zone 715 Nose Landing Gear 735 Wing Landing Gear, Left 745 Wing Landing Gear, Right 755 Body Landing Gear, Left 765 Body Landing Gear, Right

Prepare to Lift the Airplane on Jacks.
 S 492-021
 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 (Ref 09-11-00/201).
 S 492-022
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASKS 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 AND DAMAGE TO EQUIPMENT.
 (2)  Install the door locks in the main landing gear and the nose landing gear doors (Ref 32-00-30/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 07-11-03
 ALL  ú ú 01 Page 204 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 G. Lift the Main Landing Gear Axles (Normal Tire Conditions)
 S 492-003
 (1)  Put the jack directly below the jack pad of the applicable gear truck.
 NOTE: You can use the axle jacks below one axle, below the two
____ axles of a gear, or below all axles of all gears. See Fig. 202 for limits to lift the airplane in windy conditions.
 S 862-004
 CAUTION: THE LANDING GEAR STRUTS MUST BE CORRECTLY SERVICED TO PREVENT
_______ DAMAGE TO THE AIRPLANE STRUCTURE. WHEN YOU LIFT THE AIRPLANE, DO NOT LIFT A MAIN GEAR AXLE MORE THAN NECESSARY TO SUPPLY 2 INCHES OF TIRE CLEARANCE FOR A FULLY INFLATED TIRE.
 (2)  
Make sure the shock struts are inflated.

 S 492-005

 (3)  
Install the wheel chocks at the inflated tires of the truck that is not being lifted with the jack.

 NOTE: Make sure you have a set of wheel chocks on a set of landing
　
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