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 disconnect for the return module on hydraulic systems 2
 and 3.  If you must operate the landing gear, you must
 connect the return hose on the service cart to the
 return module through the access door.
 (b)  Connect the pressure hose on the hydraulic service cart to the
 ground service disconnect on the pressure module.
 S 862-011
 (9)  Push the HYD switch on the EICAS display select panel.
 S 862-012

 (10)
 Operate the hydraulic service cart.

 (a)  
Pressurize the hydraulic system to 3000 psig.

 S 862-013
 (11)
 When you complete the hydraulic power operation, stop the operation of the hydraulic service cart.

 S 862-464

 (12)
 Release the hydraulic pressure:

 (a)  
Release the pressure in the hydraulic system (Ref paragraph 5).

 (b)  
Release the pressure in the pneumatic system (AMM 36-00-00/201).

 (c)  
Operate the bleed valve on the reservoir pressurization module to release the air pressure in the reservoir.

 S 092-465
 (13)
 Disconnect the hydraulic service cart:

 (a)  
Disconnect the pressure hose on the hydraulic service cart from the ground service disconnect on the pressure module.

 (b)  
Disconnect the return hose on the hydraulic service cart from the ground service disconnect on the return module.

 S 412-019
 (14) If it was removed, install the access door for the return module.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 612-020
 (15) Do this task: "Hydraulic Reservoir Servicing" (AMM 12-12-01/301).
 S 412-022
 CAUTION: MAKE SURE YOU LATCH THE FAIRING DOORS ON THE TRAILING EDGE
_______ CORRECTLY. DAMAGE CAN OCCUR IF THE DOORS OPEN DURING A FLIGHT.
 (16) Close the fairing doors on the trailing edge of the strut (AMM 54-62-00/201).
 TASK 29-11-00-802-023
 3. Hydraulic System Pressurization With a Demand Pump
__________________________________________________
 A. Special Tools and Equipment
 (1)  
ME60B00158 Muffler - Air Driven Hydraulic Pump

 B.
References

 (1)  
AMM 24-22-00/201, Manual Control

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

 C.
Procedure

 S 862-024
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 862-025

 (2)  
Make sure these circuit breakers for the applicable system are closed:

 (a)  
P7 Circuit Breaker Panel
 1) 7F1 HYDRAULICS DEMAND 4
 2) 7F3 HYDRAULICS HYDIM 1
 3) 7G1 HYDRAULICS DEMAND 3
 4) 7G3 HYDRAULICS HYDIM 2
 5) 7H1 HYDRAULICS DEMAND 2
 6) 7H3 HYDRAULICS HYDIM 3
 7) 7J1 HYDRAULICS DEMAND 1
 8) 7J3 HYDRAULICS HYDIM 4

 (b)  
P415 Main Power Distribution Panel
 1) 415K37 HYD PRESS IND SYS 1
 2) 415K38 HYD PRESS IND SYS 2
 3) 415K39 HYD PRESS IND SYS 3

 (c)  
P414 Main Power Distribution Panel
 1) 414G23 HYD 4 PRESS IND

 

 S 492-480
 (3)  
On system 1 or 4, install the ADP muffler on the turbine exhaust on the right side of the strut.

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

 S 862-234
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 862-235
 (5)  Do a check to determine the amount of fuel in the fuel tanks.
 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 15 minutes.
　
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