B.
Access

 (1)  
Location Zone
 221/222 Control Cabin

 C.
Procedure

 S 862-484
 (1)  
Supply external power or APU generator power to the ground handling bus (AMM 24-22-00/201).

 S 862-518

 (2)  
Pressurize the pneumatic system with a ground air source or the APU (AMM 36-00-00/201).

 S 212-485

 (3)
Do a check to determine the amount of fuel in the fuel tank.

 NOTE: If there is sufficient fuel in the applicable tank, there is
____ no time limit on the operation of the hydraulic pump. If there is less fuel than the quantities below, then the hydraulic pump operation is limited to 30 minutes.
 NOTE: The fuel weight values given below are found on a
____ specified fuel density of 6.7 pounds for a gallon (0.802 Kg for a liter).
 (a)  
For system No. 1, there must be 2000 pounds (900 KG) of fuel in the No. 1 main tank.

 (b)  
For system No. 4, there must be 2000 pounds (900 KG) of fuel in the No. 4 main tank.

 (4)  
Push the HYD switch on the EICAS display select panel.

 S 862-486
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400 MAINTENANCE MANUAL
 S 862-515
 WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL THE
 CONTROL SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER.  THE
 AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR,
 AND THE THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY
 HYDRAULIC POWER.  THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE
 TO EQUIPMENT.

 CAUTION: DO NOT OPERATE THE PUMPS IN A HYDRAULIC SYSTEM WHEN THE SYSTEM
_______ IS TOO HOT. THIS CAN CAUSE DAMAGE TO THE PUMPS.
 DO NOT OPERATE AN AUXILIARY AC HYDRAULIC PUMP FOR MORE THAN 30 MINUTES IF THERE IS NOT SUFFICIENT FUEL FOR THE OPERATION. THE HEAT EXCHANGERS IN THE HYDRAULIC SYSTEM USE FUEL TO REMOVE THE HEAT FROM THE HYDRAULIC FLUID.
 DO NOT OPERATE A HYDRAULIC SYSTEM FOR 20 MINUTES AFTER A SYSTEM BECOMES TOO HOT.
 (5)  Put the HYD PUMPS DEMAND switch, for the applicable system, in the AUX position.
 NOTE: The switch is on the overhead panel, P5.
____
 S 212-488
 (6)  
Make sure the pressure in the applicable hydraulic system becomes stable between 1800 and 3200 psi.

 S 862-489

 (7)  
When you complete the hydraulic pump operation, put the HYD PUMPS DEMAND switch in the OFF position.

 S 862-490

 (8)  
Remove the electrical power, if it is not necessary (AMM 24-22-00/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 862-519
 (9)
Release the pressure in the pneumatic system (AMM 36-00-00/201).

 S 862-520

 (10)
 Release the pressure in the hydraulic system (Ref, par. 6).

 TASK 29-11-00-802-048
 6.  Hydraulic System Depressurization_________________________________
 A. References
 (1)
AMM 24-22-00/201, Manual Control

 (2)
AMM 36-00-00/201, Pneumatic System

 B.
Access

 (1)  
Location Zone
 454 System 1 - Strut Aft Fairing
 464 System 2 - Strut Aft Fairing
 474 System 3 - Strut Aft Fairing
 484 System 4 - Strut Aft Fairing

 (2)  
Access Panel 454AL Trailing Edge Fairing Doors - System 1 454DR Hydraulic Depressurization Valve Access Door - System 1 464AL Trailing Edge Fairing Doors - System 2 464DR Hydraulic Depressurization Valve Access Door - System 2 474AL Trailing Edge Fairing Doors - System 3 474DR Hydraulic Depressurization Valve Access Door - System 3 484AL Trailing Edge Fairing Doors - System 4 484DR Hydraulic Depressurization Valve Access Door - System 4
　
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