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747-400 MAINTENANCE MANUAL
 2) Move the landing gear control handle, on the P2 panel, to the UP position, and hold momentarily. 3) Move the landing gear control handle, on the P2 panel, to the DN (down) position.
 (q)  
Make sure the landing gear control handle, on the P2 panel, is in the DN (down) position.

 (r)  
Do a check of the QTY (quantity) indication for hydraulic systems No. 1, 2, 3, and 4 on the EICAS status display (AMM 31-61-00/001). 1) Make sure that the QTY indication for each hydraulic system

 did not change by more than 0.05.

 (s)  
Remove the power from hydraulic systems No. 1 and 4 (AMM 29-11-00/201).

 S 794-017
 (6)  
Do a check of the return valve for leaks.

 S 614-018

 (7)  
Do a check of the fluid level in the reservoir for hydraulic system No. 1.

 (a)  
Fill up the reservoir to the correct level if the fluid level is low (AMM 12-12-01/301).

 S 614-019
 (8)  
Do a check of the fluid level in the reservoir for hydraulic system No. 2.

 (a)  
Fill up the reservoir to the correct level if the fluid level is low (AMM 12-12-01/301).

 F.
Put the Airplane Back to Its Usual Condition

 S 094-025
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK 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.
 (1)  Do this task: "Remove the Door Locks from the Wing Gear"
 (AMM 32-00-30/201).

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 (2)  S 094-021Do this task: "Remove the Door Locks from the Body Gear" (AMM 32-00-30/201).
 (3)  S 864-026Remove the electrical power, if it is not necessary (AMM 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 BRAKE SOURCE SELECTOR VALVE FUSE AND
____________________________________
 ACCUMULATOR ISOLATION VALVE FUSE - REMOVAL/INSTALLATION

_______________________________________________________
 1.  General
_______
 A.  There are three tasks in this procedure. There is a task for the removal and a task for the installation of the hydraulic fuses. There is also a task for the operational test of the hydraulic fuses.
 B.  The brake source selector valve fuse is installed in the left wing gear wheel well. The accumulator isolation valve fuse is installed in the right wing gear wheel well.
 TASK 32-41-77-004-010
 2.  Hydraulic Fuse Removal (Fig. 401)
______________________
 A.  References
 (1)
AMM 09-11-00/201, Towing

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

 (3)
AMM 29-11-00/201, Main Hydraulic Supply System

 (4)
AMM 32-00-30/201, Landing Gear Door Locks

 (5)
AIPC 29-11-67 Fig. 1

 (6)
AIPC 32-41-77-01 Fig. 1, Sheet 3

 B.  
Access

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

 C.  
Prepare for the removal.

 S 494-001
 WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING
_______ GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
　
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