(2)
Depressurize the Yellow hydraulic system (Ref. TASK 29-10-00-864-002).
(3)
Depressurize the reservoir of the Yellow hydraulic system (Ref. TASK 29-14-00-614-001).
(4)
De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
Subtask 12-36-29-010-085
B. Get Access
(1)
Open the right MLG door (Ref. TASK 32-12-00-010-001).
(2)
Open the engine 2 fan-cowl doors (Ref. TASK 71-13-00-010-040).
Yellow Hydraulic System of the EDP 3030GD - Flushing Schematic
Figure 302/TASK 12-36-29-991-002
(3) Open the access door 198CB. Subtask 12-36-29-860-054
C. Preparation for the Flushing Procedure
(1)
Put the warning notices in position.
(2)
Put the safety barriers in position.
(3)
Put the access platform in position below the Zone 147.
(4)
Put the containers in position to collect the hydraulic fluid below:
-
the engine driven pump 3030GD,
-
the case drain filter 3084GM,
-
the LP manifold 3003GM.
(5)
Disconnect the case-drain lower line from the engine driven pump 3030GD.
(6)
Disconnect the pressure line from the engine driven pump 3030GD.
(7)
Disconnect the case-drain upper and lower lines from the case drain filter 3084GM.
(8)
Disconnect the case-drain upper line from the LP manifold 3003GM.
(9)
Connect the pressure line and the case-drain lower line together with a union.
(10)
Put the hydraulic power cart in position as necessary. CAUTION : MAKE SURE THAT THE FLOW RATE AND THE SUPPLY PRESSURE ON THE
_______ GROUND HYDRAULIC CART ARE SET TO A MINIMUM.
(11)
Connect the pressure hose of the hydraulic power cart to the filter end of the case-drain lower-line with an adaptor.
(12)
Connect the return hose of the hydraulic power cart to the delivery connector 3008GM with an adaptor.
(13)
Put blanking plugs on the disconnected line ends.
4. Procedure
_________
(Ref. Fig. 302/TASK 12-36-29-991-002) Subtask 12-36-29-170-051
A. Flush the Yellow hydraulic system.
(1)
Operate the hydraulic power cart for 20 s at 20 bar (290.0754 psi).
(2)
Stop the hydraulic power cart.
(3)
Disconnect the pressure hose of the hydraulic power cart and the adaptor from the case-drain lower line.
(4)
Disconnect the return hose of the hydraulic power cart and the adaptor from the delivery connector 3008GM.
(5)
Remove the blanking plugs. CAUTION : MAKE SURE THAT THE FLOW RATE AND THE SUPPLY PRESSURE ON THE
_______ GROUND HYDRAULIC CART ARE SET TO A MINIMUM.
(6)
Connect the pressure hose of the hydraulic power cart to the filter end of the case-drain upper-line with an adaptor.
(7)
Connect the return hose of the hydraulic power cart to the manifold end of the case-drain upper-line with an adaptor.
(8)
Put blanking plugs on the disconnected line ends.
(9)
Operate the hydraulic power cart for 20 s at 20 bar (290.0754 psi).
(10) Stop the hydraulic power cart. Subtask 12-36-29-960-051
B. Replace the subsequent components:
(1)
The case-drain filter element (Ref. TASK 29-13-43-610-040).
(2)
The HP filter element (Ref. TASK 29-13-45-610-001).
5. Close-up
________ Subtask 12-36-29-860-055
A. Put the system back to the serviceable condition.
(1)
Disconnect the pressure and return hoses of the hydraulic power cart and the adaptors from the case-drain upper line.
(2)
Disconnect and remove the union from the pressure line and the case-drain lower line.
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