(g)
Remove the optional retention tool for if it was installed on the shock strut.
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747-400 MAINTENANCE MANUAL
S 612-022
(5) Do the servicing of the shock strut on the nose landing gear (AMM 12-15-05/301).
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747-400 MAINTENANCE MANUAL
JACK AIRPLANE AXLES - MAINTENANCE PRACTICES
___________________________________________
1. General_______
A. This procedure contains one task. The task is to lift the airplane axles with jacks.
B. There are jack points on the truck beam below each landing gear axle. You can use these to remove a wheel and tire or brake assemblies without lifting the airplane. For approximate heights of the axle jack pads and clearances between the tires, see Fig. 201.
C. You must lift the axle to permit the use of the axle jacks if there are conditions that are not normal. An example of non normal conditions are as follows:
(1) The two tires on the same axle are flat, and the height of the axle jack point is decreased to where normal axle jacks are too high.
TASK 07-11-03-582-023
2. Lift Airplane Axles (Fig. 201)___________________
A. General
WARNING: TRUCKS CAN SCRUB AROUND WHEN YOU TOW OR TAXI AN AIRPLANE IN A
_______ TURN. THEREFORE, IF A TRUCK IS LIFTED WHEN THE AIRPLANE IS STOPPED DURING A TURN, THE GEAR WILL TEND TO UNTWIST. THE JACK CAN FAIL WHEN LARGE SIDE LOADS ARE GENERATED. IF YOU THINK THERE ARE SIDE LOADS, MOVE THE AIRPLANE STRAIGHT FORWARD OR AFT A MINIMUM OF 10 FEET TO REMOVE THE LOADS.
CAUTION: DO NOT LIFT THE AIRPLANE OR THE GEAR ASSEMBLY WITH A JACK BELOW
_______ A PART OF THE TRUCK OTHER THAN THE AXLE JACK PADS. YOU CAN CAUSE TRUCK FAILURE IF THERE IS DAMAGE FROM THE JACK.
INSTALL CHOCKS ON THE WHEELS THAT ARE NOT JACKED AND RELEASE THE BRAKES BEFORE YOU LIFT OR LOWER THE AXLE. THE TRUCK BEAM MUST BE FREE TO TURN RELATIVE TO THE WHEELS WHICH STAY ON THE GROUND.
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747-400
MAINTENANCE MANUAL
AFT END OF TRUCK BEAM MAIN GEAR
CONDITION 49 X 17 TIRE 49 X 19 TIRE
A B C A B C
(INCHES) (INCHES) (INCHES) (INCHES) (INCHES) (INCHES)
TIRES NORMALLY INFLATED AIRPLANE AT MAX TAXI WEIGHT 12.5 23.5 8.6 9.0 1 2 12.5 21.5 8.6 9.0 2 1
BOTH TIRES FLAT AIRPLANE AT MAX TAXI WEIGHT 7.0 20.0 8.6 9.0 2 1 7.5 18.5 8.6 9.0 2 1
ON WHEEL RIMS AIRPLANE AT MAX TAXI WEIGHT 4.5 27.0 8.6 9.0 2 1 4.5 27.0 8.6 9.0 1 2
ENOUGH FOR TIRE CHANGE AIRPLANE ON JACKS - HIGH 20.0 26.0 8.6 9.0 2 1 20.5 24.0 8.6 9.0 1 2
IF BOLT HEADS FACE EACH OTHER
IF BOLTS TURNED UNTIL
BOTH HEADS FACE AWAY
FROM TRUCK CENTERLINE
____THE DIMENSIONS GIVEN IN THE TABLE ABOVE ARE APPROXIMATE
NOTE: AND WILL BE DIFFERENT ON DIFFERENT TIRE TYPES AND CONDITIONS.
Jack Pad Locations - Axle Jacking Figure 201 (Sheet 1)
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