(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.

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 (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).

 Subtask 78-31-51-864-050
 B. Depressurization of the Hydraulic System
 FOR 1000EM1

 (1) Depressurize the Green hydraulic system (Ref. TASK 29-10-00-864-001). FOR 1000EM2

 (2) Depressurize the Yellow hydraulic system (Ref. TASK 29-10-00-864-002).

 (3) Put a warning notice in position to tell persons not to pressurize the applicable system.

 - On the panel 40VU.

 - On the ground service panel of the applicable hydraulic system.

 Subtask 78-31-51-010-050
 C. Get Access
 (1) Open the fan cowl doors (Ref. TASK 71-13-00-010-040):
 FOR 1000EM1
 437AL, 438AR
 FOR 1000EM2
 447AL, 448AR

 (2) Put the access platform in position.

 Subtask 78-31-51-040-050
 D. Make the right thrust reverser unserviceable (Ref. TASK 78-30-00-481-041).
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 Subtask 78-31-51-010-051
 E. Open the right thrust reverser door (Ref. TASK 78-36-00-010-040): FOR 1000EM1 452AR FOR 1000EM2 462AR
 4. Procedure
_________
 (Ref. Fig. 301/TASK 78-31-51-991-300)
 Subtask 78-31-51-020-050
 A. Removal of the Hydraulic Control Unit (HCU) Filter
 (1) Put a drain can 1 USgal (4 l) under the HCU filter.

 (2) Remove and discard the lockwire.

 (3) Remove the filter bowl: WARNING : YOU MUST REMOVE THE FILTER BOWL CAREFULLY BECAUSE IT IS

_______ FULL OF HYDRAULIC FLUID AND INJURY CAN OCCUR.
 (a) Remove the filter bowl (5) from the HCU (15).
 (4) Remove the filter cartridge (10) from the filter bowl (5). Discard the filter cartridge.
 Subtask 78-31-51-420-050
 B. Installation of the Hydraulic Control Unit Filter R (1) Put a new filter cartridge (10) into the filter bowl (5).
 (2) Fill the filter bowl (5) with thrust reverser hydraulic fluid.

 (3) Install the filter bowl on the HCU. Tighten the filter bowl with your hand.

 NOTE : Apply a witness line of finish paint EA4 blue 5991 (Material
____ No. CP2245) after the filter bowl is tighten.
 (4) Safety the filter bowl with lockwire 0.032 in. (0.8 mm) dia. (Material No. CP8001) or lockwire 0.032 in. (0.8 mm) dia. (Material No. CP8002).
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 Hydraulic Control Unit Filter
 Figure 301/TASK 78-31-51-991-300

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 (5) Remove the drain can.

 Subtask 78-31-51-863-050
 C. Pressurization of the Hydraulic System
 WARNING : PRESSURIZATION OF THE HYDRAULIC SYSTEM CAN RESULT IN
_______ INADVERTENT THRUST REVERSER OPERATION. REMOVE ALL PERSONNEL FROM THE AREA AROUND THE THRUST REVERSER BEFORE THE HYDRAULIC SYSTEM IS PRESSURIZED. FAILURE TO COMPLY CAN RESULT IN INJURY TO PERSONNEL.
 FOR 1000EM1
 (1) pressurize the Green hydraulic system (Ref. TASK 29-10-00-863-002). FOR 1000EM2

 (2) pressurize the Yellow hydraulic system (Ref. TASK 29-10-00-863-003). The red clogging indicator is not extended.

 Subtask 78-31-51-410-057
 D. Close Access
 (1) Make sure that the work area is clean and clear of tool(s) and other items.

 (2) Close the right thrust reverser cowl door (Ref. TASK 78-36-00-410-040):

 - FOR 1000EM1
 452AR

 - FOR 1000EM2
 462AR

 Subtask 78-31-51-440-052
 E. Make the thrust reverser serviceable (Ref. TASK 78-30-00-081-041).
 Subtask 78-31-51-869-053
 F. Bleed the air from the thrust reverser hydraulic system (Ref. TASK 78-30-00-710-040).
　
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