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07-11-03
ALL ú ú 01 Page 211 ú Jun 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(g)
Lift the axle with the auxiliary jacking bar until you can put the jack below the axle jack pad.
(h)
Put the jack directly below the jack pad of the applicable gear truck.
NOTE: If one tire is flat on each axle of a gear, it is
____ recommended that you use a jack below each axle. If only one jack is available, use cribbing below one axle while you lift the other axle. This is to prevent too much load on the tire on the axle that you will not lift, and will decrease the risk of tire failure. If two tires on one axle and one tire on other axle of a gear are flat, always replace the tire on the axle with one flat tire before you replace the tires on the other axle. Limits to lift the airplane in windy conditions are found on Fig. 202.
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.
(i) Lift the jack.
NOTE: Use the jack system manufacturer's instructions on the
____
jack placard.
I. Lift the Nose Gear Axle (Normal Tire Conditions)
S 492-014
(1) Install the jack directly below the jack pad on the nose gear axle.
NOTE: Limits to lift the airplane in wind conditions are on
____
Fig. 202.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
07-11-03
ALL ú ú 01 Page 212 ú Jun 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
S 492-015
(2) Install wheel chocks on the main gear tires.
NOTE: Put them at a set of the inflated tires of one truck on the
____ left side of the airplane and one truck on the right side of the airplane.
S 492-016
CAUTION: THE TILLER AND RUDDER PEDALS ARE DIRECTLY CONNECTED TO NOSE
_______ GEAR STEERING. IF THE TILLER OR RUDDER PEDALS MOVE, IT IS POSSIBLE TO MOVE THE NOSE GEAR OFF THE JACK. TO PREVENT THIS, MAKE SURE THE LOCKOUT PIN IS INSTALLED OR THE TORSION LINKS ARE DISCONNECTED.
(3)
Install the steering lockout pin.
S 492-017
(4)
Install lock assembly for the nose gear steering system.
S 862-018
CAUTION: DO NOT PERMIT MORE WEIGHT ON THE JACK OR JACK PAD THAN THE
_______ APPROVED LIMITS. IF THERE ARE GUSTY CROSSWINDS WHILE THE NOSE GEAR IS ON THE AXLE JACK, THE AXLE CAN TURN AROUND THE JACK CONE IF THE AIRPLANE WEATHERVANES. YOU CAN APPLY THE PARKING BRAKES TO DECREASE THE AIRPLANE MOVEMENT. WHEN THERE ARE SEVERE GUSTY WINDS, IT IS RECOMMENDED YOU LOWER THE AIRPLANE AS SOON AS POSSIBLE. AN OPTIONAL METHOD TO PREVENT THE AXLE FROM TURNING IS TO STATION A PERSON IN THE CONTROL CABIN, TO MONITOR THAT STEERING CONTROLS ARE NOT MOLESTED, AND TEMPORARILY REMOVE THE STEERING LOCKOUT PIN. IF REMOVED, INSERT THE LOCKOUT PIN AS SOON AS POSSIBLE AFTER MAINTENANCE IS DONE AND BEFORE YOU LOWER THE JACK.
(5) Lift the jack.
NOTE: Use the jack system manufacturer's instructions on the jack
____
placard.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
07-11-03
ALL ú ú 01 Page 213 ú Jun 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
J. Lift the Nose Gear Axle (Unusual Conditions - One or More Flat Tires)
S 582-019
(1) Lift the nose gear axle.
(a) You can use one of the procedures that follow to lift the nose gear axle and there are no load limits to these: 1) Inflate the tires 2) Use the minimum height jack 3) Use the incline block
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