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-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
R 7. Examine the clamps and the parts that attach the clamps, look for:
A. Missing clamp or None allowed If a clamp or nut is
attaching part missing replace it (Ref. IPC 78-36-51) (Ref. TASK 78-36-51-400-041).
5. Close-up
________
Subtask 78-36-51-410-052
A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Close the thrust reverser cowl doors (Ref. TASK 78-36-00-410-040): FOR 1000EM1 451AL, 452AR FOR 1000EM2 461AL, 462AR
(3) Remove the access platform(s).
Subtask 78-36-51-440-051
B. Make the thrust reverser serviceable (Ref. TASK 78-30-00-081-041).
Subtask 78-36-51-410-053
C. Close Access
(1) Close the fan cowl doors (Ref. TASK 71-13-00-410-040): FOR 1000EM1 437AL, 438AR FOR 1000EM2 447AL, 448AR
(2) Remove the warning notice(s).
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THRUST REVERSER INDEPENDENT LOCKING SYSTEM - DESCRIPTION AND OPERATION
______________________________________________________________________
1. General
_______ An independent locking system is designed to isolate the thrust reverser from the aircraft hydraulic system. This system consists of thrust reverser Shut-Off Valve (SOV) upstream of the Hydraulic Control Unit (HCU), a filter and associated plumbing, mounting and electrical supply. The SOV is electrically actuated from an independent signal from the SEC (Spoiler Elevator Computer), bypassing the FADEC command circuit.
2. Component Location
__________________
The SOV and the filter are located under the pylon.
(Ref. Fig. 001)
-------------------------------------------------------------------------------| FIN | FUNCTIONAL DESIGNATION | PANEL | ZONE | ACCESS | ATA | | | | | | | REF. | -------------------------------------------------------------------------------
50EG1 VALVE-THRUST REVERSER 410 437AL 78-37-51 ISOLATION, ENG1 50EG2 VALVE-THRUST REVERSER 420 447AL 78-37-51 ISOLATION, ENG2 3455KM1 FILTER-THRUST REVERSER 410 437AL 78-37-51 ISOLATION VALVE, ENG1 3455KM2 FILTER-THRUST REVERSER 420 447AL 78-37-51 ISOLATION VALVE, ENG2
3. Component Description
_____________________
(Ref. Fig. 002)
A. Shut-Off Valve The thrust reverser Shut-Off Valve (SOV) is a 3 port, two position spool valve. It is controlled by a solenoid driven 3 port, two position normally open pilot valve. Electrical power is supplied to the SOV through the fan electrical feeder box.
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Shut-Off Valve and Filter Location
Figure 001
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Shut-Off Valve Schematic
Figure 002
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B. Filter and Clogging Indicator It is used to filter the fluid from the aircraft hydraulic system. The filter is a flow-through cartridge-type filter. The clogging indicator monitors the pressure loss through the filter cartridge and has a pop-out indicator to signal when it is necessary to replace the filter element. Two spring-loaded magnetic pistons keep the pop out indicator in retracted position. The lower magnetic piston monitors the differential between the filtered and unfiltered fluid pressure across the filter element. As the differential pressure increases, the piston compresses its spring and moves away from the upper magnetic piston. At a preset displacement of approximately 2 mm, the upper magnetic piston spring overcomes the magnetic force and drives the pop-out indicator from its retracted position. The filter assembly contains a check valve to permit the removal of the canister and the change of the filter element with a minimum of spillage.
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