(d) If the system pressure is less than 2800 psi (193.0531 bar) during the test:
1 Do the steps (1) (a) thru (f) of this procedure.
_ MAIN HYDRAULIC POWER - DESCRIPTION AND OPERATION
________________________________________________
1. General_______ The main hydraulic power systems are those which supply the high power consumers of the aircraft with hydraulic power. The aircraft has three main hydraulic systems, they are:
-
the Green main system (Ref. 29-11-00),
-
the Blue main system (Ref. 29-12-00),
-
the Yellow main system (Ref. 29-13-00).
The three main systems are hydraulically isolated from each other. It is not
possible for hydraulic fluid to go from one main system to any other main
system.
Reservoir volume included, the volume of fluid in each system is
approximately:
-100l for the Green system,
-60l for the Blue system,
-75l for the Yellow system.
Engine-driven pumps (EDP) supply the Green and Yellow main systems with hydraulic power. The EDP of the Green system is connected to the left (No. 1) engine. The EDP of the Yellow system is connected to the right (No. 2) engine. An electric pump supplies the Blue main system.
The three main systems automatically supply hydraulic power when the engines operate. The two EDP are connected directly to their related engine (through the accessory gearbox), and the Blue electric pump operates when any one of the two engines starts. All of the main systems operate at a nominal pressure of 3000 psi (206 bar).
It is also possible to pressurize each main system with one or more of the
auxiliary systems if the main pumps can not be used.
The Yellow electric pump (Ref. 29-24-00) or the power transfer unit (PTU)
(Ref. 29-33-00) can pressurize the Yellow main system. The PTU (Ref.
29-23-00) can pressurize the Green main system. The ram air turbine
(Ref.29-22-00) can pressurize the Blue main system.
For maintenance all of the systems can be pressurized from a ground hydraulic supply. Connectors are installed on the ground service panels of the three systems. On the ground it is also possible to pressurize the main systems as follows:
-Yellow main system, with the Yellow electric pump,
-Green main system, with the Yellow electric pump (through the PTU),
-Blue main system, with the Blue electric pump.
Operation of the systems is usually fully automatic. If there is a fault or for maintenance, it is possible to control parts of the systems from the flight compartment.
The condition of the main systems is monitored at different places in the systems. The data is used in the electronic centralized aircraft monitor (ECAM) system and also for the indication of faults.
MAIN HYDRAULIC POWER - MAINTENANCE PRACTICES
____________________________________________ TASK 29-10-00-864-001 Depressurize the Green 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.
1. Reason for the Job
__________________
To make sure that the Green hydraulic system is depressurized before work is done on the system.
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
29-23-00-860-001 Disconnection of the Isolation Coupling of the Power Transfer Unit (PTU) 29-23-00-860-002 Connection of the Isolation Coupling of the Power
Transfer Unit (PTU) 31-60-00-860-001 EIS Start Procedure 31-60-00-860-002 EIS Stop Procedure 32-12-00-010-001 Open the Main Gear Doors for Access 32-12-00-410-001 Close the Main Gear Doors after Access
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