-
the cartridge type,
-
the in-line type.
The cartridge type 3059GM, 3094GM is installed on the HP and PTU manifolds. These two check valves are the same as the check valves 1059GM, 1094GM installed in the Green hydraulic system (Ref. 29-11-00).
The in-line type of check valve is installed in all other locations in the system. It is the same as the in-line check valve installed in the Green hydraulic system (Ref. 29-11-00).
R **ON A/C 059-099, 102-149, 151-199, 201-299, 301-399, 401-499,
M. Priority Valve 3064GM The priority valve 3064GM is installed on the PTU manifold. It is the same as the priority valve 1064GM installed in the Green hydraulic system (Ref. 29-11-00).
N. Sampling Valve 3187GM The sampling valve 3187GM is installed on the HP manifold. It is the same as the sampling valve 1187GM installed in the Green hydraulic system (Ref. 29-11-00).
P. Check Valves
The system has two types of check valve. They are:
-
the cartridge type,
-
the in-line type.
Two cartridge type check valves are installed on the HP and PTU manifolds. These two check valves are the same as the check valves installed in the Green hydraulic system (Ref. 29-11-00).
The in-line type of check valve is installed in all other locations in the system. It is the same as the in-line check valve installed in the Green hydraulic system (Ref. 29-11-00).
**ON A/C ALL
Q. Compensated Slide 3010GM
R (Ref. Fig. 015) Couplings at the housing end and at the end termination connect the compensated slide assembly to the pipework of the hydraulic system. The housing end is screwed into the housing to make a cylinder for the piston. Temperature changes or movement of the wing which changes the length of the pipework is compensated in the unit with the movement of the piston. 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.
R Compensated Slide Figure 015
1EFF : 1 1 1CES ALL 1 111 29-13-00 Page 39 Aug 01/05
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 EDP starts to supply the system as soon as the No. 2 (right) engine is started. The supply is then continuous. The EDP supplies 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 because of the response time of the EDP.
If the pressure in the Yellow hydraulic system decreases to approximately 500 psi (34.5 bar) less than the pressure in the Green hydraulic system, the PTU automatically operates. It pressurizes the Yellow hydraulic system to approximately the same pressure as the Green hydraulic 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 displays and as FAULT warnings on the overhead panel.
**ON A/C 001-049, 051-058, 101-101,
Two P/B switches on the overhead panel 40VU control the operation of the Yellow hydraulic system. One P/B switch 3703GD 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 HP system. The EDP stays connected to the suction line and keeps an internal pressure which is sufficient for lubrication of the pump.
The second P/B switch 1802GL controls the two PTU solenoid valves (one in the Yellow hydraulic system, one in the Green hydraulic 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.
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