(2)
Pressurize the Yellow hydraulic system (Ref. TASK 29-10-00-863-002).
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(3)
Do the operational test of the Power Transfer Unit (PTU) (Ref. TASK 29-23-00-710-002).
(4)
Examine the connection of the solenoid valve and make sure that there are no leaks.
(5)
Depressurize the Yellow hydraulic system (Ref. TASK 29-10-00-864-002).
Subtask 29-23-51-869-051
D. Check of the Torque Value of the Bolts
(1)
Do a check and if necessary torque the bolts (9) again to between 1.6 and 1.8 m.daN (11.79 and 13.27 lbf.ft).
(2)
Safety the bolts (9) with lockwire, corrosion resistant steel dia.
0.8 mm (0.032 in.).
5. Close-up
________ Subtask 29-23-51-860-053
A. Put the aircraft back to the serviceable condition.
(1)
Remove the container.
(2)
Connect the isolation coupling of the PTU (Ref. TASK 29-23-00-860-002).
(3)
Remove the warning notice(s).
(4)
Make sure that the work area is clean and clear of tool(s) and other items.
(5)
Close the main door of the main gear (Ref. TASK 32-12-00-410-001).
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______________________________________________________ DESCRIPTION AND OPERATION
_________________________
1. General
_______
The Yellow auxiliary generation system supplies hydraulic power for operation of all components in the Yellow system. The system has an electric pump which provides the auxiliary hydraulic power. One task of the system is the operation of the forward and aft cargo doors. The system can also provide Green hydraulic power through the power transfer unit.
The Yellow system hand pump provides hydraulic power for operation of the forward and aft cargo doors. The data about the hand pump is contained in 52-36-00.
2. Component Location
__________________
(Ref. Fig. 001, 002)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA
| | | | DOOR | REF. -------------------------------------------------------------------------------3075GX ELEC PUMP-Y 196 196BB 29-24-51 3009GM HAND PUMP-CARGO DOOR, Y 198 198CB 29-10-00 3270GM LEVER-HAND PUMP 198 198CB 29-10-00 3807GX CT-Y ELEC PUMP 107VU 126 822 29-24-15 3808GX DET-PHASE UNBALANCE, Y ELEC PUMP 126 822 29-24-16
3. System Description
__________________ (Ref. Fig. 003) The electric pump provides hydraulic pressure for the auxiliary generation system. It is installed in the Yellow hydraulic bay. The pushbutton switch (3804GX) on the overhead panel controls the operation of the electric pump.
The electric hydraulic pump supplies hydraulic pressure to the right thrust reverser and the High-Pressure (HP) manifold. A hand pump is installed on the ground service panel of the Yellow system. It supplies pressure to the forward and aft cargo-compartment doors (through the selector valve).
The system has a current transformer (3807GX) and a phase unbalance detector (3808GX) which protect the electric circuit of the electric pump. The current transformer and the phase unbalance detector are installed on panel 107VU.
Component Location
Figure 001
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Component Location
Figure 002
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System Description
Figure 003
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4. Power Supply____________ (Ref. Fig. 004) The power supply for the electric pump is three-phase, 115 V AC. It comes from either AC bus 2 2XP or external supply.
Two contactors are installed in the system. One contactor is connected to the supply line from the AC bus supply, the other is connected to the supply line from the external power supply. The two contactors are connected to each other by shunts. Operation of the contactors controls the supply of electrical power to the electric pump.
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