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A
747-400 MAINTENANCE MANUAL
S 862-010
WARNING: WHEN YOU LIFT AN AXLE ON THE MAIN GEAR, DO NOT PUT A LOAD ON
_______ THE JACK MORE THAN 85,000 POUNDS (38,500 KG) IF THE AXLE OPPOSITE THE ONE YOU WILL LIFT HAS ONLY ONE INFLATED TIRE AND THE AXLE IS NOT HELD. IF YOU DO NOT OBEY THIS CAUTION, THE TIRE CAN FAIL BECAUSE OF TOO MUCH LOAD.
(3) Lift the jack.
NOTE: Use the jack system manufacturer's instructions on the jack
____
placard.
S 862-011
CAUTION: WHEN YOU USE AN INCLINED BLOCK, IT IS NECESSARY THAT ALL GEAR
_______ STRUT ARE CORRECTLY SERVICED AND THE TIRES THAT REMAIN ARE SERVICEABLE, AND THE AIRPLANE MGTW IS 450,000 POUNDS (204,000 KG) OR LESS. THERE ARE LIMITS WHEN YOU USE THE INCLINED BLOCKS BECAUSE OF TIRE OVERLOAD, NOT BECAUSE OF AIRPLANE STRUCTURAL LIMITS.
(4) If you cannot use jacks or they are not available, push or tow the airplane until the main gear moves up an inclined block (Fig. 203) on serviceable tires only (Ref 09-11-00/201).
NOTE: A 7 1/2-inch high block will supply approximately 1-inch tire
____
clearance on the wing or the body gear.
S 012-024
CAUTION:_______YOU MUST USE AUXILIARY JACKING BARS IN PAIRS. IF YOU JACK THE AXLE WITH A SINGLE JACKING BAR, DAMAGE TO THE AXLE CAN OCCUR.
(5)
If you will use the auxiliary jacking bars for the main landing gear to lift the airplane, remove the applicable antiskid transducer and support (Ref 32-41-09/401).
S 582-013
(6)
If you cannot install the jack below the axle pad, lift the airplane with the auxiliary jacking bar for the main landing gear.
CAUTION:_______DO NOT THE REMOVE AXLE NUT. IT IS POSSIBLE THE NUTS WILL HAVE A HIGH LOAD ON THEM.
(a) Refer to Fig. 204 to find if one or two jacking adapters are necessary.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL
77 INCHES
238 INCHES
20 INCHES 77 INCHES
Inclined Block (Example)
Figure 203
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07-11-03
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747-400
MAINTENANCE MANUAL
CAUTION: YOU MUST PUSH THE JACKING BAR IN UNTIL IT TOUCHES THE AXLE
_______ END. THIS WILL PREVENT DAMAGE TO THE AXLE.
(b) Install the auxiliary jacking bar in the end of the axle as far as it is possible.
CAUTION: YOU MUST LIFT THE AIRPLANE WITH THE SHOCK STRUT INFLATED.
_______
(c)
Make sure the shock struts are inflated.
(d)
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 at a set of
____ landing gear tires on the right side and the left side of the airplane. If both trucks on one side of the airplane are lifted with axle jacks, put wheel chocks at the nose gear tires.
(e)
Release the brakes.
(f)
Put the axle jack below the jack pad for the auxiliary jacking bar.
0 100,000 200,000 300,000 400,000 500,000 600,000 700,000 800,000
0 (45,350) (90,700) (136,050) (181,400) (226,750) (272,100) (317,450) (362,800)
WEIGHT OF AIRPLANE IN POUNDS (IN KG)
DO NOT PERMIT MORE THAN 60,000 POUNDS (27,200 KG) LOAD ON EACH AUXILIARY JACKING BAR. DO NOT PERMIT MORE THAN 111,000 POUNDS (50,300 KG) TOTAL JACK LOAD ON EACH AXLE. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 LIFTING AND SHORING(15)
