(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 12-36-29-010-088
B. Get Access
(1)
Open the right MLG door (Ref. TASK 32-12-00-010-001).
(2)
Open the access door 198CB.
Yellow Hydraulic System of the PTU 1088GM - Flushing Schematic
Figure 305/TASK 12-36-29-991-005
Subtask 12-36-29-860-063
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 at the Zone 148.
(4)
Put the containers in position to collect the hydraulic fluid below:
-
the PTU 1088GM,
-
the LP manifold 3003GM.
(5)
Disconnect the pressure line from the Yellow hydraulic system side of the PTU 1088GM.
(6)
Disconnect the case drain line from the Yellow hydraulic system side of the PTU 1088GM.
(7)
Disconnect the case drain line from the LP manifold 3003GM.
(8)
Connect the pressure line and the case drain line together with a union.
(9)
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.
(10)
Connect the pressure hose of the hydraulic power cart to the delivery connector of 3008GM with an adaptor.
(11)
Connect the return hose of the hydraulic power cart to the manifold end of the case-drain line with a adaptor.
(12)
Put blanking plugs on the disconnected line ends.
4. Procedure
_________ (Ref. Fig. 305/TASK 12-36-29-991-005) Subtask 12-36-29-170-054
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. Subtask 12-36-29-960-054
B. Replace the LP filter element (Ref. TASK 29-13-44-610-001).
5. Close-up
________ Subtask 12-36-29-860-064
A. Put the system back to the serviceable condition.
(1)
Disconnect the return hose of the hydraulic power cart and the adaptor from the case drain line.
(2)
Disconnect the pressure hose of the hydraulic power cart and the adaptor from the delivery connector 3008GM.
(3)
Disconnect and remove the union from the pressure line and the case drain line.
(4)
Remove the hydraulic power cart.
(5)
Remove the blanking plugs.
(6)
Connect the case drain line to the PTU 1088GM.
(7)
Connect the pressure line to the PTU 1088GM.
(8)
Connect the case drain line to the LP manifold 3003GM.
Subtask 12-36-29-790-054
B. Leak Test of the Components which were Disconnected
(1)
Pressurize the Yellow hydraulic system (Ref. TASK 29-10-00-863-002).
(2)
Make sure that there is no hydraulic fluid leakage.
(3)
Depressurize the Yellow hydraulic system (Ref. TASK 29-10-00-864-002).
Subtask 12-36-29-942-093
C. Put the aircraft back to its initial configuration.
(1)
Remove the container.
(2)
Remove the safety barriers.
(3)
Remove the access platform(s).
(4) Remove the warning notice(s). Subtask 12-36-29-410-075
D. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Close the right MLG door (Ref. TASK 32-12-00-410-001).
(3)
Close the access door 198CB.
(4)
Remove the ground support and maintenance equipment, the special and standard tools and all other items.
TASK 12-36-29-170-006
Flushing of the Yellow Hydraulic System of the Electrically Driven Pump 3075GX
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