(i)
Do this task if it is necessary: "Hydraulic Reservoir Servicing" (AMM 12-12-01/301).
S 962-216
(13) Replace the hydraulic fluid in system No. 4:
NOTE: System No. 4 uses approximately 52 gallons (197 liters)
____ of new hydraulic fluid. The steps that follow replace approximately 60% of the total fluid volume.
(a)
Pressurize the hydraulic system with the service cart
(Ref par. 2).
(b)
Operate the elevators through 9 full cycles.
(c)
Operate the rudder through 3 full cycles.
(d)
Operate the lateral controls through 12 full cycles.
(e)
Operate the elevators through 18 full cycles.
(f)
Do this task if it is necessary: "Hydraulic Reservoir Servicing" (AMM 12-12-01/301).
(14)
Turn off the hydraulic service cart.
(15)
Operate the rudder to release the pressure in the hydraulic system.
S 432-476
(16)
For system No. 1, connect the torsion links on the nose landing gear (AMM 32-21-03/401).
S 862-217
S 862-218
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(17)
Connect the torsion links for the body landing gear (AMM 32-53-11/201).
S 092-478
(18)
Disconnect the hydraulic service cart:
(a)
Disconnect the drain hose from the EDP supply hose.
(b)
Disconnect the hydraulic service cart from the EDP pressure hose.
(c)
Connect the supply hose and the pressure hose to the EDP.
S 862-222
(19)
Pressurize the hydraulic system with the EDP (Ref par. 4).
S 792-223
(20)
Examine the EDP hose connections for leakage.
(a)
If you find leakage, repair the cause of it.
S 862-252
(21)
Operate the rudder to release the hydraulic system pressure.
S 412-226
(22)
Close the right thrust reverser half (AMM 78-31-00/201).
S 862-228
(23)
Close 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 862-512
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.
(24) Do this task: "Trailing Edge Flap Retraction" (AMM 27-51-00/201).
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S 862-230
(25) Remove the electrical power if it is not necessary for other operations (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
MAIN HYDRAULIC SUPPLY SYSTEM - INSPECTION/CHECK
_______________________________________________
1. General_______
A. This procdure has the tasks which follow:
(1)
Hydraulic System No. 1 Gross Internal Leakage Check.
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