CAUTION: MAKE SURE YOU USE BMS 3-11 HYDRAULIC FLUID TO FLUSH THE
_______ HYDRAULIC SYSTEM. HYDRAULIC FLUID WHICH DOES NOT AGREE WITH THE BMS 3-11 SPECIFICATION CAN CAUSE CONTAMINATION OF THE HYDRAULIC SYSTEM.
(b)
Connect the pressure hose to the pressure hose of the hydraulic service cart.
(c)
Connect the return hose of the hydraulic service cart to the ground service disconnect on the system return module.
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747-400 MAINTENANCE MANUAL
(d)
Operate the hydraulic service cart.
(e)
Pressurize the system to 3000 psig.
(f)
Operate the flight controls quickly in the sequence shown below:
~..............................................................................
| | HYDRAULIC SYSTEM CYCLES |
| CONTROL ............. .... ............................... .......... ...
| SURFACES | NO. 1 | NO. 2 | NO. 3 | NO. 4 |
................................................................................ | 1. ELEVATORS | 10 | 10 | 10 | 10 | ................................................................................ | 2. RUDDER | 3 | 3 | 3 | 3 | ................................................................................ | 3. LATERAL | 6 | 12 | 12 | 12 | ................................................................................ | 4. ELEVATORS | 20 | 20 | 20 | 20 | 2..................…..............…..............…..............…..............1
S 962-573
(9)
Replace the filter elements for the case drain module (AMM 29-11-18/201).
S 212-574
(10)
Examine the pressure module.
(a)
If the diferential pressure indicators are extended, replace the filter elements for the pressure module (AMM 29-11-23/201).
S 092-576
(11)
Disconnect the hydraulic service cart:
(a)
Disconnect the return line on the service cart from the ground service disconnect on the return module.
(b)
Disconnect the pressure line on the service cart from the EDP pressure hose.
(c)
Connect the pressure hose to the EDP pressure port.
S 862-577
(12) Presuririze the hydraulic system with the EDP (Ref Par. 4).
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747-400 MAINTENANCE MANUAL
S 862-578
(13)
Operate all the flight controls.
S 792-579
(14)
When you complete the flight control operation, do a check for leakage:
(a)
Examine all connections that were disconnected, either for maintenance or while performing the bleeding procedures.
(b)
Examine the installations of the hydraulic power filters.
(c)
Examine the EDP connections.
(d)
If you find leakage, repair the cause of it.
S 862-581
(15)
Release the hydraulic system pressure if it is not necessary for other operations (Ref par. 5).
S 612-582
(16)
Do this task: "Hydraulic Reservoir Servicing" (AMM 12-12-01/301).
S 412-583
CAUTION: MAKE SURE YOU LATCH THE FAIRING DOORS ON THE TRAILING EDGE
_______ CORRECTLY. DAMAGE CAN OCCUR IF THE DOORS OPEN DURING A FLIGHT.
(17)
Close the fairing doors on the trailing edge of the strut (AMM 54-62-00/201).
(18)
Close the right thrust reverser half (AMM 78-31-00/201).
S 412-584
TASK 29-11-00-102-099
9. Flush an EDP Pressure Line and Case Drain Line
______________________________________________
A. Standard Tools and Equipment
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