747-400 AMM 飞机维护手册 液压 HYDRAULIC 1(42)

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 S 862-250
 WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
 FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP
 CONTROL LEVER.  WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL
 MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP
 CONTROL LEVER.  THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO

 EQUIPMENT.
 (2)  Do this task: "Trailing Edge Flap Extension" (AMM 27-51-00/201) to extend the outboard flaps to the 5 position.
 NOTE: This permits the operation of the outboard ailerons.
____
 S 862-203
 (3)  
Put the L ISLN and the R ISLN switches on the P5 panel in the OFF position.

 (a)  
Stop for approximately 10 seconds while the valves close.

 S 862-204
 (4)  
Open these circuit breakers:

 (a)  
P6 Main Power Supply Panel 1) 6H20 L ISO VLV AIR SUPPLY PWR 2) 6H24 R ISO VLV AIR SUPPLY PWR

 S 862-205
 (5)  
Release the pressure in the hydraulic system (Ref par. 4).

 S 012-206

 (6)  
Open the right thrust reverser half (AMM 78-31-00/201).

 S 492-475

 (7)  
Connect the hydraulic service cart:

 (a)  
Disconnect the supply hose and the pressure hose from the EDP.

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747-400 MAINTENANCE MANUAL
 (b)  
Connect a drain hose to the supply hose.

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

 (d)  
Connect the pressure hose on the hydraulic service cart to the EDP pressure hose.

 S 032-211
 (8)  
For system No. 1, disconnect the torsion links on the nose landing gear (AMM 32-21-03/401).

 S 032-212

 (9)  
Disconnect the torsion links for the body landing gear (AMM 32-53-11/201).

 S 862-213

 (10)
 Adjust the hydraulic service cart to supply a flow of 10-20 gpm at 3000 psig.

 S 962-214

 (11)
 Replace the hydraulic fluid in system No. 1:

 NOTE: System No. 1 uses approximately 52 gallons (197 liters)
____ of new hydraulic fluid. The steps that follow replace approximately 58% of the total fluid volume.
 (a)  
Pressurize the hydraulic system with the service cart (Ref par. 2).

 (b)  
Operate the elevators through 10 full cycles.

 (c)  
Operate the rudder through 3 full cycles.

 (d)  
Operate the lateral flight controls through 6 full cycles.

 (e)  
Operate the nose and body gear steering through 2 full cycles.

 (f)  
Operate the elevators through 20 full cycles.

 (g)  
Do this task if it is necessary: "Hydraulic Reservoir Servicing" (AMM 12-12-01/301).

 (12)
 Replace the hydraulic fluid in system No. 2 or 3:

 S 962-215
 NOTE: Systems No. 2 and 3 use approximately 36 gallons
____ (136 liters) of new hydraulic fluid each. The steps that follow replace approximately 85% of the total fluid volume.
 (a)  Pressurize the hydraulic system with the service cart (Ref par. 2).
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747-400 MAINTENANCE MANUAL
 (b)  
Put the STAB TRIM in the 9 position.

 (c)  
Make sure the stabilizer motion stops, then put the STAB TRIM in the 0 position.

 (d)  
Operate the rudder through 3 full cycles.

 (e)  
Operate the elevators through 3 full cycles.

 (f)  
Operate the lateral controls through 13 full cycles.

 (g)  
Put the STAB TRIM in the 14 position.

 (h)  
　
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