(2) Put the access platform in position in the right side of engine.

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 Subtask 78-31-51-040-051

 C. Make the thrust reverser unserviceable (Ref. TASK 78-30-00-481-041).
 Subtask 78-31-51-010-053

 D. Open the right thrust reverser cowl door (Ref. TASK 78-36-00-010-040): FOR 1000EM1 452AR FOR 1000EM2 462AR
 Subtask 78-31-51-614-050
 E. Depressurization of the Hydraulic Reservoirs
 (1) For engine 1 depressurize the Green hydraulic reservoir (Ref. TASK 29-14-00-614-001).

 (2) For engine 2 depressurize the Yellow hydraulic reservoir (Ref. TASK 29-14-00-614-001).

 4. Procedure
_________
 (Ref. Fig. 401/TASK 78-31-51-991-301)
 Subtask 78-31-51-020-051

 A. Removal of the Hydraulic Control Unit (HCU)
 (1) Disconnect the electrical connector 4101KS-A from solenoid A of the HCU.
 NOTE : If necessary, use the softnose pliers to loosen the electrical
____
 connectors.

 (2) Disconnect the electrical connector 4101KS-B from solenoid B of the HCU.

 (3) Disconnect the electrical connector 4102KS-A from the HCU pressure switch.

 (4) Remove the nut (25) and the bolt (5) that attach the clamp (10) to the interface bracket (15).

 (5) Move the right thrust reverser harness (30) aside.

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 Hydraulic Control Unit
 Figure 401/TASK 78-31-51-991-301- 13 (SHEET 1)
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 Hydraulic Control Unit
 Figure 401/TASK 78-31-51-991-301- 23 (SHEET 2)
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 Hydraulic Control Unit
 Figure 401/TASK 78-31-51-991-301- 33 (SHEET 3)
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 (6) Put a cover on the engine case to keep hydraulic fluid off.

 (7) Disconnect hoses:
R  WARNING : DO NOT GET THE FLUID ON YOUR SKIN OR IN YOUR EYES. IF YOU_______
R  DO:
R  - FLUSH IT AWAY WITH CLEAN WATER
R  - GET MEDICAL AID.
 (a) Disconnect the supply hose (50), the return hose (45), and the latch return hose (40) from the left side of the HCU (20). Drain hydraulic fluid into the drain can.

 (b) Disconnect the latch supply hose (55), the head supply hose (60), and the rod supply hose (65) from the pipes at the interface bracket (15).

 (8) Disconnect the CVR pipe (100) from the check valve restrictor.

 (9) Remove the nut (95) that attaches the CVR pipe (100) to the support (90). Remove the CVR pipe (100).

 (10) Remove the nut (105) that attaches the rod supply pipe (75) to the interface bracket (15).

 (11) Remove the nuts (80) and (85) that attach the latch return pipe (35), the head supply pipe (70) and the support (90) to the interface bracket (15).

 (12) Disconnect the latch supply pipe (110), the head supply pipe (70) and the rod supply pipe (75) from the right side of the HCU (20).

 (13) Remove the bolts (115) that attach the HCU (20) to the forward frame. Remove the HCU (20).

 (14) Remove the thermal blankets as follows:
 (Ref. Fig. 402/TASK 78-31-51-991-303)

 NOTE : Removal of the thermal blanket is not required, and is
____ included for reference only. The thermal blanket must be installed if the HCU is to be returned to the supplier.
 (a) Remove the bolts (120) that attach the interface bracket (15) to the HCU (20).

 (b) Remove the thermal blankets (175) and (180) from the HCU (20).

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 Hydraulic Control Unit Thermal Blankets
 Figure 402/TASK 78-31-51-991-303
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