(2)  
Hydraulic System No. 2 Gross Internal Leakage Check.

 (3)  
Hydraulic System No. 3 Gross Internal Leakage Check.

 (4)  
Hydraulic System No. 4 Gross Internal Leakage Check.

 (5)  
Hydraulic System No. 1 Full Internal Leakage Check.

 (6)  
Hydraulic System No. 2 Full Internal Leakage Check.

 (7)  
Hydraulic System No. 3 Full Internal Leakage Check.

 (8)  
Hydraulic System No. 4 Full Internal Leakage Check.

 (9)  
Differential Pressure Indicators Inspection for the Pressure and Return Filters.

 (10)
 Differential Pressure Indicators Inspection for the Case Drain Filters.

 (11)
 Case Drain Filter Check.

 (12)
 Hydraulic System External Leakage Check.

 (13)
 Hydraulic System Internal Leakage Pressure Check.

 (14)
 Movement of the Fluid Between the Hydraulic Systems Check.

 B.  
To do the internal leakage check, it is necessary to pressurize each hydraulic system to 3000 psig. A hydraulic service cart or the system demand pump can be used as a pressure source. If a hydraulic service cart is used as a pressure source, it is necessary to install a flowmeter in the hydraulic pressure line between the cart and the system pressure module. If the system demand pump is used, it is necessary to:

 (1)  
Install a flowmeter in the hydraulic line between the demand pump pressure port and the pressure module

 (2)  
Have a sufficent quantity of fuel in the fuel tanks for the operation of the heat exhanger.

 C.  
To do the external leakage check, it is necessary to pressurize each hydraulic system to 3000 psig. Each system pump is used as a pressure source. It is necessary to have a sufficient quantity of fuel in the fuel tanks for the operation of the heat exchanger.

 D.  
It is necessary to open the doors on the trailing edge fairing to get access for these tasks. On the inboard systems, it is also necessary to open the landing gear doors.

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 29-11-00
 ALL  ú ú 01 Page 601 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 TASK 29-11-00-796-639
 2.  Hydraulic System No. 1 - Gross Internal Leakage Check_______________________________________________
 A. Standard Tools and Equipment
 (1)  410DME-10AR Flowmeter (commercially available)
 ACL Technologies Inc.
 Santa Clara, CA 92705-5419

 -
It must be able to pass a flow of 32 gpm at 3000 psig without damage.

 -
It must measure a flow of 0.25 to 7.50 gpm with a precision of | 0.5% of the reading.

 (2)  
Hydraulic Service Cart - 0 to 3000 psi with hydraulic fluid, fire-resistant, BMS 3-11.

 B.
References

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

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (3)  
AMM 32-00-30/201, Landing Gear Doors

 (4)  
AMM 54-62-00/201, Nacelle Strut Access Panels

 (5)  
AMM 54-62-02/501, Nacelle Strut Access Doors

 (6)  
AMM 54-62-03/501, Trailing Edge Fairing Doors

 C.
Access

 (1)  
Location Zone
 454 System 1 - Strut Aft Fairing
 484 System 4 - Strut Aft Fairing

 (2)  
Access Panel 454AL Trailing Edge Fairing Doors - System 1 484AL Trailing Edge Fairing Doors - System 4

 D.
Prepare for the Hydraulic System No. 1 Gross Internal Leakage Check

 S 866-640
 (1)  Supply electrical power (AMM 24-22-00/201).
 S 496-641
 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.
 (2)  
Make sure that the locks for the landing gear doors are installed (AMM 32-00-30/201).

 S 866-642

 (3)  
Make sure that the person in the flight compartment can speak with the person on the ground.

 S 016-643

 (4)  
Open the doors on the trailing edge fairing for engines No. 1 and No. 4 (AMM 54-62-00/201).
　
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