S 212-152
 (10)
 Examine the differential pressure indicator that monitors the case drain filter for the demand pump.

 (a)  
If the indicator is extended, replace the filter element for the case drain (AMM 29-11-18/201).

 S 612-153
 (11)
 Do this task: "Hydraulic Reservoir Servicing" (AMM 12-12-01/301).

 S 862-154

 (12)
 Pressurize the hydraulic system with the demand pump (Ref par. 3).

 S 792-155

 (13)
 Examine all the connections of the pressure hose and case drain hose for leakage.

 (a)  
If you find leakage, repair the cause of it.

 S 862-156
 (14) Release the pressure in the hydraulic system (Ref par. 5).
 S 412-159
 CAUTION: MAKE SURE YOU LATCH THE FAIRING DOORS ON THE TRAILING EDGE
_______ CORRECTLY. DAMAGE CAN OCCUR IF THE DOORS OPEN DURING A FLIGHT.
 (15) Close the fairing doors on the trailing edge of the strut (AMM 54-62-00/201).
 TASK 29-11-00-102-160
 11. Flush a Return Line
___________________
 A. Special Tools and Equipment
 (1)  G29006-1 Blanking Plate - Reservoir
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A
747-400
MAINTENANCE MANUAL

 B. Standard Tools and Equipment
 (1)  
Container - 1 U.S. Gallon (4 Liter) capacity, for hydraulic fluid

 (2)  
Hydraulic Service Cart - This cart must supply a flow of BMS 3-11 fire-resistant hydraulic fluid at 30 gpm at 60 psig.

 C.
References

 (1)  
AMM 12-12-01/301, Hydraulic Systems

 (2)  
AMM 29-33-01/401, Hydraulic Fluid Quantity Transmitter

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

 (4)  
AMM 36-00-00/201, Pneumatic System

 (5)  
AMM 54-62-00/201, Nacelle Strut Access Panels

 (6)  
AMM 78-31-00/201, Thrust Reverser System

 D.
Access

 (1)  
Location Zone
 412 Engine 1 - Gearbox Forward Face 5:00 o'clock
 454 System 1 - Strut Aft Fairing
 422 Engine 2 - Gearbox Forward Face 5:00 o'clock
 464 System 2 - Strut Aft Fairing
 735 System 2 - Wing Landing Gear Wheel Well
 432 Engine 3 - Gearbox Forward Face 5:00 o'clock
 474 System 3 - Strut Aft Fairing
 745 System 3 - Wing Landing Gear Wheel Well
 442 Engine 4 - Gearbox Forward Face 5:00 o'clock
 484 System 4 - Strut Aft Fairing

 (2)  
Access Panel
 416 Right Thrust Reverser Half - Engine 1
 454AL Trailing Edge Fairing Doors - System 1
 426 Right Thrust Reverser Half - Engine 2
 464AL Trailing Edge Fairing Doors - System 2
 436 Right Thrust Reverser Half - Engine 3
 474AL Trailing Edge Fairing Doors - System 3
 446 Right Thrust Reverser Half - Engine 4
 484AL Trailing Edge Fairing Doors - System 4

 E.
Procedure

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

 S 862-161
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A
747-400 MAINTENANCE MANUAL
 S 012-162
 (2)  
Open the fairing doors on the trailing edge of the strut (AMM 54-62-00/201).

 S 012-163

 (3)  
Open the right thrust reverser half (AMM 78-31-00/201).

 S 012-247
 WARNING: MAKE SURE ALL PERSONS AND EQUIPMENT ARE AWAY FROM THE DOOR
_______ OPERATION AREA. A FAST MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (4)  On hydraulic systems 2 and 3, open the landing gear doors (AMM 32-00-30/201).
 S 492-165
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE 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.
　
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