__________________________________________
1. General
_______
The aircraft has a power transfer system to transfer hydraulic power between the Green and Yellow systems. This is necessary if one of the engine pumps fails. It also makes it possible to pressurize the Green system from the Yellow system for maintenance (with the Yellow system electric pump).
The power transfer system is always armed when the hydraulic systems are
pressurized. However, the crew can switch it off if necessary.
The connection between the two systems is mechanical. It is impossible for
fluid to get from one system to the other.
When the isolation coupling is disconnected (during ground maintenance
operations only), there is no transfer of power.
2. Component Location
__________________
**ON A/C 001-049, 051-058, 101-101,
(Ref. Fig. 001)
R **ON A/C 059-099, 102-149, 151-199, 201-299, 301-399, 401-499,
(Ref. Fig. 001A)
**ON A/C 001-049, 051-058, 101-101,
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA
| | | | DOOR | REF. -------------------------------------------------------------------------------1088GM PTU-G/Y 148 734 29-23-41 1012GL SOL VALVE-PTU, G 146 734 29-23-51 3012GL SOL VALVE-PTU, Y 147 734 29-23-51 3701GM SELF SEALING CPLG-PTU DELIVERY, Y 148 734 29-10-00
R **ON A/C 059-099, 102-149, 151-199, 201-299, 301-399, 401-499,
1088GM PTU-G/Y 148 734 29-23-41 3701GM SELF SEALING CPLG-PTU DELIVERY, Y 148 734 29-10-00
Component Location Figure 001
R 1EFF : 1 1 1CES 001-049, 051-058, 101-101, 1 111 29-23-00 Page 2 May 01/05
Component Location
Figure 001A
R 1EFF : 059-099, 102-149, 151-199, 201-299, 1 29-23-00Page 3 1301-399, 401-499, 1Aug 01/05 1 1 1CES 1 **ON A/C ALL
3. System Description
__________________
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
(Ref. Fig. 002)
R **ON A/C 401-499,
R (Ref. Fig. 002A)
**ON A/C 001-049, 051-058, 101-101,
The primary components in the power transfer system are:
-
the Power Transfer Unit (PTU)
-
the Green-System solenoid valve (1012GL)
-
the Yellow-System solenoid valve (3012GL)
-
the isolation coupling
-
the PTU switch.
Power is automatically sensed and transferred through the PTU. A piston in the PTU's control valve is exposed to the Green and Yellow system pressure. When the pressure difference between the Green and Yellow systems is more than 500 psi (34.5 bar), the PTU starts to operate. The PTU transfers power from the system with the larger pressure to the other system. The PTU of the Green and Yellow systems is connected to the Green and Yellow-system solenoid valves.
When the Yellow electric pump starts because of operation of the cargo doors, movement of the flight controls is prevented. Electrical power is supplied to the two solenoid valves of the Green and Yellow systems (1012GL and 3012GL) and the solenoid valve of the Yellow-leakage measurement system (3150GP). Thus no hydraulic power is supplied to the Green or Yellow system.
The two solenoid valves keep the PTU either armed or off. The solenoid valve of the Green system (1012GL) is connected to the Green PTU manifold. The solenoid valve of the Yellow system (3012GL) is connected to the Yellow PTU manifold. The two solenoid valves operate at the same time. The PTU switch on the overhead panel 40VU controls the solenoid valves.
There is no transfer of power when the isolation coupling is disconnected.
Power Transfer - Schematic
Figure 002
R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 29-23-00Page 5 1201-299, 301-399, 1Aug 01/05 1 1 1CES 1
R Power Transfer - Schematic
R Figure 002A
R 1EFF : 401-499, 1 29-23-00 Page 6
1 1 Aug 01/05
1 1
1CES 1
The PTU switch is installed in the overhead panel 40VU. All other components are installed in the main landing-gear compartment.
R **ON A/C 059-099, 102-149, 151-199, 201-299, 301-399, 401-499,
The primary components in the power transfer system are:
-
the Power Transfer Unit (PTU)
-
the Green-System solenoid valve
-
the Yellow-System solenoid valve
-
the isolation coupling
-
the PTU switch.
Power is automatically sensed and transferred through the PTU. A piston in the PTU's control valve is exposed to the Green and Yellow system pressure. When the pressure difference between the Green and Yellow systems is more than 500 psi (34.5 bar), the PTU starts to operate. The PTU transfers power from the system with the larger pressure to the other system. The PTU of the Green and Yellow systems is connected to the Green and Yellow-system solenoid valves.
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