Yellow Hydraulic System - Schematic R Figure 010
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R Yellow Hydraulic System - Schematic
R Figure 010A
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There are two different types of EDP which are permitted. VICKERS make one type, ABEX the other. The two types are completely interchangeable. They give equivalent supplies of hydraulic power and their mechanical and electrical connections are the same. The Power Transfer Unit (PTU) 1088GM can also pressurize the Yellow HP circuit (Ref. 29-23-00). The PTU gets its power from the Green hydraulic system (Ref. 29-11-00). It supplies power to the Yellow hydraulic system if the pressure in the system falls to approximately 500 psi (34.48 bar) below the pressure in the Green hydraulic system. There is no hydraulic connection between the two hydraulic systems so no fluid can get from one system to the other.
If the EDP fails, or for maintenance on the ground, it is possible to pressurize the Yellow hydraulic system with the electric pump (Ref. 29-24-00). The output of the electric pump is connected to the HP supply downstream of the check valve 3050GM. A check valve 3083GM is installed in the output line from the electric pump to stop reverse flow of fluid to the pump.
On the ground, it is possible to pressurize the Yellow hydraulic system from a ground supply. The system has self-sealing connectors for a ground supply installed on the ground service panel.
The ground service panel for the Yellow hydraulic system is installed in the right belly fairing aft of the main gear compartment. The components and connections necessary to service the Yellow hydraulic system (not including the reservoir air pressurization connection and the reservoir drain) are installed in a group together on it. The ground service panel has these components on it:
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the ground test pressure and suction self-sealing connectors 3008GM and 3006GM,
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the Yellow reservoir depressurization valve 3087GM (Ref. 29-14-00),
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the hand pump lever 3270GM (which is for the reservoir filling and cargo door hand-pumps),
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the EL/MAN selector valve 2500MJ of the cargo door system (Ref. 52-36-00),
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the hand pump 3009GM of the cargo door system (Ref. 52-36-00).
A pressure switch 3074GD and a check valve 3050GM are installed downstream of the EDP. The pressure switch monitors the output pressure of the pump (Ref. 29-32-00). The check valve stops the flow of fluid to the pump if another source pressurizes the system.
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**ON A/C 001-049, 051-058, 101-101,
The supply to most of the consumers goes through the HP and Leakage Measurement System (LMS) manifolds. Thus it is possible to isolate some consumers to measure the internal leakage of parts of the system. The supply to the alternate and parking brake systems goes from the HP manifold through the brake manifold.
The HP manifold has ports which connect it to the other parts of the system as follows:
-a system pressure inlet from the pumps and ground supply,
-two outlets to the LMS manifold,
- one outlet to the PTU manifold,
- one inlet from the PTU manifold,
- one connection to the system accumulator/cargo doors/brake manifold.
A solenoid valve 3150GP on the HP manifold controls the flow of fluid to the LMS manifold. The solenoid valve is usually operated from the flight compartment but it also has an automatic function. This function is related to the operation of the cargo doors. When the cargo doors are set to open or close (and the Yellow electric pump starts), the solenoid valve is automatically closed. This stops the supply of fluid to the flight controls. Thus there is no danger of movement of flight controls because of operation of the cargo doors.
The system pressure inlet to the HP manifold has a filter 3048GM with a filtration rating of 15 microns. A check valve 3059GM is installed on the manifold. A sampling valve 3187GM makes it possible to take samples of fluid from the system for analysis. You can take the sample when the system is at full pressure.
A pressure relief valve (PRV) 3063GM is installed on the HP manifold to protect the system against overpressure. The PRV opens when the pressure is greater than or equal to 237 bar (3436 psi) and closes at 220 bar (3190 psi). Two pressure switches 3151GN, 10CE-3 and a pressure transducer 3065GN are also installed on the HP manifold to monitor the pressure in the system (Ref. 29-32-00).
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