(2)
Install chocks at each wheel.

 (3)
Release the parking brake.

 S 494-002
 S 864-003
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A

747-400 MAINTENANCE MANUAL
ACCUMULATOR ISOLATION VALVE FUSE
SEE A
SEE B
A
BRAKE SOURCE SELECTORVALVE FUSE
B
Accumulator Isolation Valve Fuse and Brake Source
Selector Valve Fuse Installation
Figure 401

D06743
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A
747-400
MAINTENANCE MANUAL

 S 494-004
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (4)  
Do this task: "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).

 S 494-005

 (5)  
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).

 S 864-006

 (6)  
Remove pressure from hydraulic system No. 1, 2 and 4
 (AMM 29-11-00/201).

 S 864-007

 (7)  
Remove the pressure from the brake accumulator:

 (a)  
Look at the pressure on the HYD BRAKE PRESS gage on the captain's instrument panel.

 (b)  
Push the brake pedals fully 10 times.

 (c)  
Make sure the pressure does not decrease the last time you operate the brake pedals.

 S 864-008
 (8)  
Remove the pressure from hydraulic system No. 1, 2, and 4 reservoirs (AMM 29-11-00/201).

 D.
Procedure

 S 034-007
 (1)  
Remove the support clamps from the hydraulic fuse.

 S 034-008

 (2)  
Loosen the two nuts on the hydraulic fuse.

 NOTE: Make sure there is no leakage of the hydraulic fluid.
____
 S 164-009
 (3)  
If there is leakage of the fluid, identify the fluid and clean the area (AMM 12-25-01/301).

 (4)  
Remove the hydraulic fuse.

 S 024-010
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A
747-400 MAINTENANCE MANUAL
 S 434-011
 CAUTION: DO NOT LET THE HYDRAULIC LINES AND FITTINGS STAY OPEN.
_______ CONTAMINATION OF THE HYDRAULIC SYSTEM CAN OCCUR. THIS CAN CAUSE DAMAGE TO THE SYSTEM COMPONENTS AND LEAKAGE OF HYDRAULIC FLUID.
 MAKE SURE YOU FULLY CLEAN ALL HYDRAULIC FLUID LEAKAGE. HYDRAULIC FLUID CAN CAUSE CORROSION.
 (5)  Install the caps on the hydraulic tubes.
 TASK 32-41-77-404-026
 3.  Hydraulic Fuse Installation (Fig. 401)___________________________
 A. Consumable Materials
 (1)  
D00054 Assembly Lube - Skydrol, MCS 352

 B.
References

 (1)  
AMM 12-12-01/301, Hydraulic Systems

 (2)  
AMM 12-25-01/301, Exterior Cleaning

 (3)  
AIPC 29-11-67 Fig. 1

 (4)  
AIPC 32-41-77-01 Fig. 1, sheet 3

 C.
Access

 (1)  
Location Zone
 135 Wing Landing Gear Well, LH
 136 Wing Landing Gear Well, RH

 D.
Procedure

 S 034-012
 CAUTION: DO NOT LET THE HYDRAULIC LINES AND FITTINGS STAY OPEN.
　
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