A320飞机维护手册 AMM HYDRAULIC POWER 液压1(95)

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R R R R  (6) If you will pressurize the Yellow system at the same time with the Green system through the PTU, the ECAM must not show these warnings: - Low air pressure in the Yellow reservoir - Low fluid level in the Yellow reservoir.
 (7) If necessary, pressurize the reservoirs (Ref. TASK 29-14-00-614-002).
 (8) If necessary, add fluid to the applicable reservoir(s) (Ref. TASK 12-12-29-611-001) or (Ref. TASK 12-12-29-611-002).
 (9) On the main instrument panel 400VU, make sure that the landing gear selector is in the down position.
R  (10) Put a warning notice on the lever of the landing gear selector to tell persons not to move it. 
R R  (11) If it is not necessary to pressurize the Yellow system at the same time with the Green system: 
R R R R  NOTE : Usually the PTU automatically pressurizes the Yellow hydraulic____ system at the same time with the Green hydraulic system. If you pressurize the Green system only, then it is necessary to stop the operation of the PTU. 
R R  (a) On section 40VU of the overhead panel, push the PTU pushbutton switch. Make sure that the OFF legend comes on.
 (b) Disconnect the PTU isolation coupling (Ref. TASK 29-23-00-860-001). 
R R  (12) Depressurize the reservoir of the Green hydraulic system (Ref. TASK 29-14-00-614-001). 
R R R  (13) Connect the suction and delivery lines of the hydraulic ground power-supply to the aircraft ground connectors: - 1006GM suction - 1008GM delivery.

 

R (14) Pressurize the reservoir of the Green hydraulic system (Ref. TASK 29-14-00-614-002).
 4. Procedure
_________
 Subtask 29-10-00-863-050

 A. Pressurization with the Hydraulic Ground Power Supply
 (1) Start the hydraulic ground power supply and pressurize the Green system to 3000 psi (206 bar).
 NOTE : If the PTU is not isolated obey the subsequent precautions to
____
 prevent damage to the PTU:

 -make sure that the air pressure in the Green and Yellow reservoirs does not fall below 3 bar (43.5113 psi)
 -limit the flow of the ground hydraulic supply to max 76 l.min (20.0769 USgal.mn).
 (2) Refer to the ECAM indication of the GREEN system pressure and make sure it shows 3000 psi.
 NOTE : If the PTU is not isolated, it pressurizes the Yellow system
____ at the same time. Usually, the PTU pressurizes the system to a nominal pressure of 3000 psi, but if no consumers operate, the pressure is not constant. The PTU operates in a cycle which keeps the pressure in the Yellow system between 2400 and 3100 psi.
 5. Close-up
________
 Subtask 29-10-00-860-054

 A. Put the aircraft back to the serviceable condition.
 (1) Depressurize the Green hydraulic system (Ref. TASK 29-10-00-864-001). R (2) Disconnect the hydraulic ground power-supply.
 (3)
 Remove the warning notice from the lever of the landing gear selector.

 (4)
 In section 40VU of the overhead panel, push the PTU pushbutton switch. Make sure that the OFF legend goes off.

 (5)
 Connect the PTU isolation coupling (Ref. TASK 29-23-00-860-002).

 

R R R  (6) Make sure that the fluid level in the reservoir of the Green hydraulic system is correct. Add fluid as necessary (Ref. TASK 12-12-29-611-001) or (Ref. TASK 12-12-29-611-002). 
R R  (7) If necessary, pressurize the reservoir of the Green hydraulic system (Ref. TASK 29-14-00-614-002). 
R  (8) Do the EIS stop procedure (Ref. TASK 31-60-00-860-002). 
R  (9) De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
 Subtask 29-10-00-410-050
 B. Close the access door 197CB.

 

 TASK 29-10-00-863-002
 Pressurize the Yellow Hydraulic System
 WARNING : OBEY THE HYDRAULIC SAFETY PROCEDURES.
_______
 WARNING : MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES ARE
_______
 CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.

 WARNING : PRESSURIZE ONLY THE HYDRAULIC SYSTEM(S) THAT IS (ARE) NECESSARY FOR
_______ THE TASK. ISOLATE THE OTHER HYDRAULIC SYSTEM(S) BEFORE YOU SUPPLY HYDRAULIC POWER TO THE AIRCRAFT.
 CAUTION : DO NOT CONNECT GROUND POWER SUPPLIES TO THE GREEN AND YELLOW
_______
 HYDRAULIC SYSTEMS AT THE SAME TIME. THIS COULD CAUSE:

 -THE PTU TO OPERATE TOO FAST
 -DAMAGE TO THE PTU IF ONE GROUND POWER SUPPLY IS IN OPERATION AND THE OTHER IS IN THE BY-PASS MODE.
 1. Reason for the Job
__________________
 To pressurize the Yellow hydraulic system (with a ground power supply) for maintenance.
 NOTE : The procedure to pressurize the Yellow hydraulic system with the
　
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