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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 588-063
 (2)  
Put the weight of the airplane back to the landing gear (AMM 07-11-01/201).

 S 618-064

 (3)  
Do the servicing of the shock strut for the wing landing gear (AMM 12-15-03/301).

 S 938-065

 (4)  
Remove the label that shows "one or two sets of spare seals were used".

 S 098-103
 WARNING: YOU MUST CAREFULLY DO THE STEPS BELOW TO REMOVE THE DOOR LOCKS
_______ FROM THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (5)  
Do this task: "Removal of the Door Locks from the Wing Landing Gear" (AMM 32-00-30/201).

 S 098-104

 (6)  
Do this task: "Removal of the Door Locks from the Body Landing Gear" (AMM 32-00-30/201).

 TASK 32-11-02-368-117
 4.  Inner Cylinder Seals Replacement With Spare Seals (Fig. 801)_________________________________________________
 A. General
 (1)  
The use of the airplane jacks in this task for the seal replacement is not necessary.

 (2)  
It is necessary to extend the shock strut for the wing landing gear to permit the seal replacement.

 (3)  
When you do this seal replacement, the airplane gross weight must not be more than 564,000 pounds. And the center of gravity must not be more than the flight limits (15-33% MAC) in less than 20 knots wind velocity. In wind more than 20 knots, decrease the maximum approved gross weight of the airplane with the Fig. 806 data. Do not replace the seals in wind more than 50 knots. The wind velocity is independent of direction.

 (4)  
The airplane must have an clean condition (the flaps retracted, the zero stabilizer setting and etc).

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 32-11-02
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
WIND VELOCITY VS MAXIMUM GROSS WEIGHT FOR REPLACEMENT OF THE LOWER SEALS WITH THESPARE SEALS WITHOUT THE AIRPLANE ON JACKS

0  10  20  30  40  50 
WIND VELOCITY (KNOTS)  MAXIMUM WIND 
VELOCITY 

Wind Velocity VS Gross Weight Chart
Figure 806

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 32-11-02
 ALL  ú ú 01A Page 829 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (5)  
The subsequent procedure gives the seal replacement on the shock strut for the left wing landing gear. For the seal replacement on the shock strut for the right wing landing gear, do the equivalent operations.

 (6)  
This procedure gives the removal of the lower bearing for the shock strut with a puller. An optional procedure is to increase the pressure on the shock strut with nitrogen or dry air. It is necessary to have approximately 100 psi to remove the lower bearing. This procedure prevents to use a special tool but is necessary to follow the safety precautions.

 (7)  
As an alternative, fill the shock strut for the nose landing gear with nitrogen or dry air only. Keep the dimension A to a limit to approximately 24.85 inches (AMM 12-15-05/301). Fill the shock strut with nitrogen or dry air for the nose landing gear. And fill the shock strut with oil for the body landing gear at the same time.

 B.
Special Tools and Equipment

 (1)  
MIT65B01201 Lower Gland Nut Wrench Adapter

 (2)  
G32011-1 - Oversize Gland Nut Wrench Adapter (Airplanes with oversize gland nut)

 (3)  
7MIT65B01211-1 Lower Gland Seal Split Guide

 (4)  
21MIT65B01211-1 Gland Seating Tool

 (5)  
2MIT65B01201 Lower Bearing Seal Retainer Puller

 C.
Standard Tools and Equipment
　
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