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747-400 MAINTENANCE MANUAL
 (b)  
Disconnect the tube at the OUT port on the pressure module (AMM 29-11-23/201).

 (c)  
Connect a drain hose to the OUT port of the pressure module.

 (d)  
Put the end of the drain hose into the container to catch the hydraulic fluid.

 WARNING: MAKE SURE THE END OF THE DRAIN HOSE CANNOT MOVE WHILE YOU
_______ FLUSH THE LINE. THE FLOW OF THE HYDRAULIC FLUID CAN CAUSE APPROXIMATELY 50 POUNDS OF THRUST. THIS CAN CAUSE CONTAMINATION OF THE SYSTEM, DAMAGE TO EQUIPMENT, AND INJURY TO PERSONS.
 (e)  
Flush the pressure line for 10 seconds with a flow of 30-40 gpm at 500-700 psig.

 (f)  
Turn off the hydraulic service cart.

 (g)  
Disconnect the hydraulic service cart from the EDP pressure hose.

 (h)  
Remove the drain hose from the OUT port on the pressure module.

 (i)  
Connect the tube to the OUT port on the pressure module.

 S 212-115
 (7)  
Examine the differential pressure indicator that monitors the EDP pressure filter.

 (a)  
If the indicator is extended, replace the pressure filter element (AMM 29-11-23/201).

 S 172-479
 (8)  
Flush the case drain line:

 (a)  
Disconnect the tube from the OUT port on the case drain module.

 (b)  
Connect the drain hose to the OUT port on the case drain module.

 (c)  
Put the end of the hose in the container to catch the hydraulic fluid.

 NOTE: The bowls for the case drain filter must be
____
 installed to permit fluid flow.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400
MAINTENANCE MANUAL

 (d)  Connect the pressure line of the hydraulic service cart to the EDP case drain hose.
 WARNING: MAKE SURE THE END OF THE DRAIN HOSE CANNOT MOVE WHILE YOU
_______ FLUSH THE LINE. THE HYDRAULIC FLUID FLOW CAN CAUSE APPROXIMATELY 10 POUNDS OF THRUST. THIS CAN CAUSE CONTAMINATION, DAMAGE TO EQUIPMENT, AND INJURY TO PERSONS.
 (e)  
Flush the case drain line for 10 seconds with a flow of 10 gpm at 500 psig.

 (f)  
Disconnect the hydraulic service cart from the case drain hose.

 (g)  
Connect the tube to the OUT port on the case drain module.

 S 422-516
 (9)  
Reinstall the check valves:

 (a)  
Do the steps which follow for the check valves, for the pressure and case drain, at the EDP (AMM 29-11-06/401): 1) Remove the check valve. 2) Visually inspect the check valve. If you find

 contamination, remove it.
 3)  Make sure check valve operates correctly. Use a nylon probe. a) Make sure the poppet moves freely.
 4) Replace the check valve, if it does not operate correctly. 5) Install the check valve.
 (b)  
Do the above steps for the check valves, for the pressure and case drain of the EDP, on the engine firewall.

 (c)  
Do the steps which follow for the check valve, for the EDP, in the pressure module (AMM 29-11-23/201): 1) Remove the check valve. 2) Visually inspect the check valve. If you find

 contamination, remove it.
 3)  Make sure check valve operates correctly. Use a nylon probe. a) Make sure the poppet moves freely.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-00
 ALL  ú ú 01 Page 234 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
　
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