(6)
32-51-00/501, Nose Wheel Steering System
E. Access
(1) Location Zones 191 Fairing Wing-To-Body Forward Lower Half, LH (Left Body Jack Point) 192 Fairing Wing-To-Body Forward Lower Half, RH (Right Body Jack Point) 116 Area Between Nose Gear Well and Fuselage, RH (Nose Jack
Point) 715 Nose Landing Gear - Shock Strut
F. Prepare to Lift the Airplane on Jacks
S 862-002
CAUTION: DO NOT LIFT THE AIRPLANE ON JACKS IN WINDS MORE THAN 30 KNOTS.
_______ IF YOU DO NOT OBEY THESE INSTRUCTIONS, DAMAGE TO THE AIRPLANE CAN OCCUR.
(1) Make sure the airplane is turned into the wind if it is possible, when it is out of the hangar.
S 492-003
WARNING: USE THE PROCEDURE IN 32-00-30/201 TO INSTALL THE DOOR LOCKS.
_______ THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
(2)
Open the doors for the nose landing gear and install the door locks (AMM 32-00-30/201).
S 492-026
(3)
Make sure the downlocks are installed on the nose and main landing gear (AMM 09-11-00/201).
S 972-004
(4)
Make sure the airplane gross weight and center of gravity (CG) are at the approved limits.
NOTE: You can move the airplane fuel load or cargo load to make
____ sure the jack point loads are at the approved limits.
(a)
The approved limits when you use the main jacks are found in Fig. 201.
(b)
The approved limits when you use the nose jacks are found in Fig. 202.
G. Lift the Airplane Nose with the Main Jacks I and II
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747-400
MAINTENANCE MANUAL
GROSS WEIGHT IN POUNDS
480,000
470,000
460,000
450,000
440,000
430,000
420,000
410,000
400,000
390,000
380,000
370,000
360,000
350,000
340,000
330,000
320,000
310,000
300,000
CENTER OF GRAVITY - % MAC
Dynamic Airplane Jacking-Maximum Gross Weight Versus C.G.
Figure 201
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747-400 MAINTENANCE MANUAL
S 612-031
CAUTION:_______ MAKE SURE THE NOSE LANDING GEAR IS PROPERLY SERVICED BEFORE YOU
PROCEED WITH THE STEPS IN THIS JACKING PROCE DURE. FAILURE TO
SERVICE THE NOSE LANDING GEAR CAN CAUSE DAMAGE TO THE AIRPLANE
AND EQUIPMENT.
(1) Do the servicing of the shock strut on the nose landing gear (AMM 12-15-05/301).
NOTE: Do not do this step if the shock strut retention tool is
____ going to be used.
0 10 20 30 40 42.4 50
CENTER OF GRAVITY - % MAC
NOTE:____ 1. NOSE GEAR FULL EXTENDED WITH
1 - INCH TIRE CLEARANCE
2. AIRPLANE ON LEVEL RAMP
3. JACK POINT REACTION
LIMITED TO 39,400 LBS
(17,800 KG)
Nose Jackpoint Weight/CG. Limitations
Figure 202
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747-400 MAINTENANCE MANUAL
S 862-028
(2) An optional method that can be used to perform maintenance on the nose landing gear and reduce the over all jacking height to acheive nose wheel clearance is to lift the airplane nose and use the retention tool for the shock strut and the body jacks at jack points I and II.
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