A. Shut-Off Valve Opening/Closing Operation The hydraulic power for the thrust reverser operation is obtained from the engine driven pump of the hydraulic system (ref. 29-10-00), which supplies the HCU through the filter and the thrust reverser SOV. The thrust reverser SOV is designed to isolate the thrust reverser from the aircraft hydraulic system. When the solenoid is de-energized the pilot and spool valves are pressure and spring driven to close the supply port. When the supply port is closed the thrust reverser is isolated from the aircraft hydraulic system. When the solenoid is energized the pilot valve releases the pressure from on the spool and opens a path to the return port. The sub-piston, which always has system pressure acting on it, will move the spool against the spring to open the control port. When the control port opens it allows the aircraft hydraulic fluid from the supply port to pass through the valve, exit the valve from the control port and enter the HCU. The thrust reverser SOV is commanded in the open position when the following conditions are satisfied:
R - aircraft is on ground proximity (less than 6 ft)
 - reverse thrust is selected

 - high forward thrust not selected on opposite engine The SOV pilot valve solenoid is supplied with 115 VAC through a dedicated and physically segregated wiring. This power supply to the SOV is controlled by a power relay commanded by a static relay. The power relay coil is enegized to open the SOV and de-energized to close the SOV. Its energization/de-energization is controlled through the 28VDC static relay which is piloted by the SEC (SEC 1 or 2 for engine 1 and SEC 1 or 3 for engine 2).

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 Thrust Reverser System Operation - Schematic
 Figure 003
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 VALVE - THRUST REVERSER, HYDRAULIC ISOLATION - SERVICING

________________________________________________________
 TASK 78-37-51-600-002
 Replacement of the Thrust Reverser Hydraulic Isolation Valve Filter
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific drain can 1 USgal (4 l)
 No specific packing installation tool AA-B847-6SE3
 No specific spatula
 No specific warning notice
 No specific 1-1/4 inch (31.75 mm) open end wrench
 No specific access platform 1 m (3 ft. 3 in.)
 No specific Torque Wrench : range 15.00 to 150.00 lbf.ft

 (2.00 to 20.00 m.daN)
 B. Expendable Parts
 -------------------------------------------------------------------------------FIG.ITEM |DESIGNATION |IPC-CSN -------------------------------------------------------------------------------
R 3 packing 78-37-51 01 -110 R 5 C-ring 78-37-51 01 -130 R 6 filter element 78-37-51 01 -100 R 8 packing 78-37-51 01 -090 R
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 C. Referenced Information

 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
29-14-00-614-001 Depressurization of the Hydraulic Reservoirs 29-14-00-614-002 Pressurization of the Hydraulic Reservoirs through
 the Ground Connector
 71-13-00-010-040 Opening of the Fan Cowl Doors
 71-13-00-410-040 Closing of the Fan Cowl Doors

R  CMM 783155 78-37-51-991-301 Fig. 301 78-37-51-991-302 Fig. 302
 3. Job Set-up
__________
 Subtask 78-37-51-941-054
 A. Safety Precautions
 (1) On the center pedestal, on the ENG panel 115VU:

 (a) Put a warning notice to tell persons not to start the engine.

 (2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.

 (3) On the overhead maintenance panel 50VU:

 (a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.

 (b) Put a warning notice to tell persons not to energize the FADEC 1(2).
　
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