R  Compensated Slide Figure 025
 1EFF : 1 1 1CES  ALL  1 111 29-11-00 Page 49 Aug 01/05

 The housing end is vented by four orifices with filters and filter retainers. The end termination is screwed into the piston. Both parts are locked by roll pins. A scraper ring, retained by a circlip, is installed in the housing. The scraper ring prevents contamination of the cylinder during movement of the piston. O-rings are installed in the housing and the housing end. These O-rings seal the different shaft diameters of the piston. A single elastomer O-ring is installed at the piston to make a seal between the piston and the cylinder wall. An O-ring with an anti-extrusion ring seals the piston with the end termination.
 6. Operation_________
 The operation of the system is fully automatic. If necessary (because of a fault or for maintenance) it is possible to stop the automatic operation of the system.
 The engine-driven pump (EDP) starts to supply the system as soon as the no 1 (left) engine is started. The supply is then continuous. The EDP pressurizes the system with fluid at 3000 psi (206 bar) and changes its output to that which is necessary for the system. The system accumulator makes allowance for any temporary decrease in pressure because of the response time of the EDP. The accumulator also smoothes the output from the EDP.
 If the EDP stays in the high output configuration and there is no demand there is an increase in pressure in the system. The pressure relief valve (PRV) opens and the fluid goes to the reservoir through the PRV. The restriction to t he flow caused by the PRV causes an increase in the temperature of the fluid. This is detected by the sensor on the LP filter and a warning is given in the flight compartment.
 If the pressure in the Green system decreases to 500 psi (34.5 bar) less than the pressure in the Yellow system, the PTU automatically operates. It pressurizes the Green system to approximately the same pressure as the Yellow system (the pressure is less because the PTU is not 100 % efficient). The condition of the system is monitored continuously. Temperature and pressure sensors send information to the flight compartment. The information is shown on the ECAM and as FAULT warnings on the overhead panel.
 Two pushbutton (P/B) switches on the overhead panel 40VU control the operation of the Green main system. One P/B switch (1705GK) controls the solenoid valve in the EDP. When the P/B switch is operated, the solenoid valve is energized and the EDP is isolated from the high pressure (HP) system. The EDP stays connected to the suction line and keeps an internal pressure which is sufficient for lubrication of the EDP.

 **ON A/C 001-049, 051-058, 101-101,
 The second P/B switch (1802GL) controls the two PTU solenoid valves (one in the Green system, one in the Yellow system). On operation of the P/B switch, the two solenoid valves are energized and the PTU is isolated from the two systems. Thus no transfer of power between the two systems is possible.
 A P/B switch (1882GP) at the rear of the overhead panel 50VU controls the solenoid valve (1150GP) of the leakage measurement system. This P/B switch is used only for maintenance.
 Operation of the fire valve 1046GK makes it possible for the crew to stop the supply of fluid to the EDP (if there is a fire in the nacelle). The fire valve closes when the ENG 1 FIRE pushbutton is operated. A symbol on the HYD page of the ECAM system display shows if the fire valve is open or closed.

R **ON A/C 059-099, 102-149, 151-199, 201-299, 301-399, 401-499,
 The second P/B switch (1802GL) controls the two PTU solenoid valves (one in the Green system, one in the Yellow system). On operation of the P/B switch, the two solenoid valves are energized and the PTU is isolated from the two systems. Thus no transfer of power between the two systems is possible.
 A P/B switch (1882GP) at the rear of the overhead panel 50VU controls the solenoid valve of the leakage measurement system. This P/B switch is used only for maintenance.
 Operation of the fire valve 1046GK makes it possible for the crew to stop the supply of fluid to the EDP (if there is a fire in the nacelle). The fire valve closes when the ENG 1 FIRE pushbutton is operated. A symbol on the HYD page of the ECAM system display shows if the fire valve is open or closed.

 GREEN MAIN HYDRAULIC POWER - ADJUSTMENT/TEST
____________________________________________
 TASK 29-11-00-710-001
 Operational Test of the Green Hydraulic System
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
　
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