S 086-614

 (2)  
If you used the system demand pump for a pressure source, remove the flowmeter:

 (a)  
Remove the flowmeter from the pressure line on the demand pump.

 (b)  
Connect the pressure line to the pressure port on the demand pump.

 (c)  
Put the system HYD PUMPS DEMAND switch on the P5 overhead panel in the ON position.

 (d)  
Examine the pressure port connection on the demand pump for leakage.

 (e)  
Put the system HYD PUMPS DEMAND switch in the OFF position.

 (f)  
Repair the cause of all leakage from the pressure connection on the demand pump.

 S 086-615
 (3)  
If you used a hydraulic service cart for a pressure source,
 disconnect the hydraulic service cart:

 (a)  
Disconnect the pressure line of the hydraulic service cart from the system No. 2 and 4 pressure modules.

 (b)  
Disconnect the return line of the hydraulic service cart from the system No. 2 and 4 return modules.

 S 616-709
 (4)  
Service the Hydraulic reservoir (AMM 12-12-01/301).

 S 216-616

 (5)  
Examine the doors on the trailing edge fairing.

 (a)  
Examine the door latches on the trailing edge fairing for cracks and wear.

 (b)  
Make sure that all latch assemblies are installed.

 (c)  
Repair and adjust the latches if it is necessary (AMM 54-62-02/501).

 S 416-617
 CAUTION: MAKE SURE YOU LATCH THE FAIRING DOORS ON THE TRAILING EDGE
_______ CORRECTLY. DAMAGE CAN OCCUR IF THE DOORS OPEN DURING A FLIGHT.
 (6)  Close the doors on the trailing edge fairing (AMM 54-62-00/201).
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 29-11-00
 ALL  ú ú 01 Page 609 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 TASK 29-11-00-706-592
 4. Hydraulic System No. 3 - 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 Zones
 474 System 3 - Strut Aft Fairing
 745 Wing Landing Gear Wheel Well

 (2)  
Access Panel
 474AL Trailing Edge Fairing Doors

 D.
Prepare for the Hydraulic System No. 3 Gross Internal Leakage Check

 S 866-593
 (1)  Supply electrical power (AMM 24-22-00/201).
 S 496-594
 WARNING: REFER TO AMM 32-00-30/201 FOR THE INSTALLATION PROCEDURE FOR
_______ LOCKS ON THE LANDING GEAR DOORS. SUDDEN MOVEMENT OF THE DOORS CAN CAUSE INJURY AND DAMAGE.
 (2)  
Make sure that the locks for the landing gear doors and the landing gears are installed (AMM 32-00-30/201).

 S 866-595

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

 S 016-596

 (4)  
Open the doors in the trailing edge fairing for engine No. 3 (AMM 54-62-00/201).

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