R **ON A/C 059-099, 102-149, 151-199, 201-299, 301-399, 401-499,
(Ref. Fig. 004A)
**ON A/C ALL
The ground internal leak test system gets electrical power from the DC system of the aircraft. The service bus 601PP supplies 28 V DC to each solenoid valve through the applicable pushbutton switch.
5. Component Description
_____________________
A. Ground Leakage-Measurement Manifold (1146GM, 2146GM and 3146GM) (Ref. Fig. 005)
There are three ground leakage-measurement manifolds. One is installed in each hydraulic system. All three manifolds are the same.
Power Supply Figure 004
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Power Supply Figure 004A
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Ground Leakage-Measurement Manifold Figure 005
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The manifold has two pairs of inlet ports (2 are identified as A and 2 are identified as B) and three outlet ports (identified as C, D and E). Only one inlet port from each pair is used, the ports which are not used are sealed.
In the manifold there are three check valves and three 2/2-way valves. All of the valves are spring loaded poppet type valves. The 2/2-way valves are manually operated. They are only selected to open for ground maintenance tasks.
**ON A/C 001-049, 051-058, 101-101,
B. Solenoid Valve (1150GP, 2150GP and 3150GP)
(Ref. Fig. 006)
R **ON A/C 059-099, 102-149, 151-199, 201-299, 301-399, 401-499,
B. Solenoid Valve
**ON A/C 001-049, 051-058, 101-101,
Each hydraulic system has a 3/2 way solenoid valve. It controls the supply of fluid to the leakage measurement manifold. The solenoid valves (1150GP and 2150GP) installed in the Green and Blue hydraulic systems are the same as one another. The solenoid valve (3150GP) installed in the Yellow hydraulic system is different from the other two.
The solenoid valves are attached to the high pressure (HP) manifold of their related system. Each solenoid valve has three hydraulic connections between it and the manifold. They are:
-
HP inlet (from system), port A,
-
HP outlet (to consumers), port C,
-LP outlet (to return), port B.
All hydraulic connections are of the bobbin type.
The two types of solenoid valve operate in the same way. When the system is pressurized, and the solenoid is de-energized, ports A and C are connected together. When the solenoid is energized ports B and C are connected and the connection between ports A and C is closed.
Solenoid Valve Figure 006
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In addition, the solenoid valve (3150GP) of the Yellow hydraulic system has a restrictor. When the solenoid is energized, this restrictor allows a small (2.5 +0.2 -0.2 l.min (0.6604 +0.0528 -0.0528 USgal.mn)) flow between ports A and B. This internal leakage is related to the automatic function of the solenoid valve on operation of the cargo doors. It makes sure that the flight control surfaces do not move during such operation.
R **ON A/C 059-099, 102-149, 151-199, 201-299, 301-399, 401-499,
Each hydraulic system has a 3/2 way solenoid valve. It controls the supply of fluid to the leakage measurement manifold. The solenoid valves installed in the Green and Blue hydraulic systems are the same as one another. The solenoid valve installed in the Yellow hydraulic system is different from the other two.
The solenoid valves are attached to the high pressure (HP) manifold of their related system. Each solenoid valve controls the:
-
HP inlet (from system),
-
HP outlet (to consumers),
-LP outlet (to return). The two types of solenoid valve operate in the same way. When the system is pressurized, and the solenoid is de-energized, the HP inlet and the HP outlet are connected together. When the solenoid is energized, the LP outlet and the HP outlet are connected and the connection between the HP inlet and HP outlet is closed.
In addition, the solenoid valve of the Yellow hydraulic system has a restrictor. When the solenoid is energized, this restrictor allows a small (2.5 +0.2 -0.2 l.min (0.6604 +0.0528 -0.0528 USgal.mn)) flow between the HP inlet and the LP outlet. This internal leakage is related to the automatic function of the solenoid valve on operation of the cargo doors. It makes sure that the flight control surfaces do not move during such operation.
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