S 864-031
 (4)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 D.  
Remove the Hydraulic Interface Module (HYDIM)

 S 864-002
 (1)  
Open these circuit breakers for the applicable hydraulic system and attach DO-NOT-CLOSE tags:

 (a)  
P7 Overhead Circuit Breaker Panel
 1) 7F03 HYDRAULICS HYDIM 1
 2) 7G03 HYDRAULICS HYDIM 2
 3) 7H03 HYDRAULICS HYDIM 3
 4) 7J03 HYDRAULICS HYDIM 4
 5) 7J01 HYDRAULICS DEMAND 1
 6) 7H01 HYDRAULICS DEMAND 2
 7) 7G01 HYDRAULICS DEMAND 3
 8) 7F01 HYDRAULICS DEMAND 4

 (b)  
P415 Main Power Distribution
 1) 415K37 HYD PRESS IND SYS 1
 2) 415K38 HYD PRESS IND SYS 2
 3) 415K39 HYD PRESS IND SYS 3

 (c)  
P414 Power Distribution Center - Left 1) 414G23 HYD 4 PRESS IND

 2)  P414 Left Auxiliary External Power Center Panel a) 414F18 HYDR PUMP CONT AUX 4 b) 414E18 HYDR PUMP CONT AUX 1
 S 024-003
 (2)  Remove the applicable circuit card for the HYDIM (AMM 20-11-22/401).
 TASK 29-11-42-404-004
 3.  Hydraulic Interface Module (HYDIM) Installation (Fig. 401)
_______________________________________________
 A.  References
 (1)  
AMM 20-11-22/401, Rack-Mounted Electrical/Electronic Module

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 29-11-42/501, Hydraulic Interface Module (HYDIM)

 B.  
Access

 (1)  
Location Zone
 117 Main Equipment Center

 C.  
Procedure

 S 424-005
 (1)  Install the applicable circuit card for the HYDIM
 (AMM 20-11-22/401).

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 S 864-006
 (2)  Supply electrical power (AMM 24-22-00/201).
 S 864-007
 (3)  Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P7 Overhead Circuit Breaker Panel 1) 7F03 HYDRAULICS HYDIM 1 2) 7G03 HYDRAULICS HYDIM 2 3) 7H03 HYDRAULICS HYDIM 3 4) 7J03 HYDRAULICS HYDIM 4 5) 7J01 HYDRAULICS DEMAND 1 6) 7H01 HYDRAULICS DEMAND 2 7) 7G01 HYDRAULICS DEMAND 3 8) 7F01 HYDRAULICS DEMAND 4 (b) P415 Main Power Distribution 1) 415K37 HYD PRESS IND SYS 1 2) 415K38 HYD PRESS IND SYS 2 3) 415K39 HYD PRESS IND SYS 3 (c) P414 Power Distribution Center - Left 1) 414L08 CMC L 2) 414G23 HYD 4 PRESS IND 3) P414 Left Auxiliary External Power Center Panel a) 414F18 HYDR PUMP CONT AUX 4 b) 414E18 HYDR PUMP CONT AUX 1 (d) P415 Power Distribution Center - Right. 1) 414L39 CMC R
 S 744-032
 (4)  Do the self-test procedure for the HYDIM (AMM 29-11-42/501).
 S 864-021
 (5)  Put the HYD PUMPS DEMAND switch, for the applicable hydraulic system, to the AUTO position.
 S 784-022
 (6)  Make sure the hydraulic system pressure on the EICAS status display is between 2900 and 3150 psig.
 S 714-023
 (7)  Make sure the PRESS light, for the demand pump, on the P7 overhead panel is off.

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747-400 MAINTENANCE MANUAL
 (8)  S 864-024Put the HYD PUMPS DEMAND switch, for the applicable hydraulic system, to the OFF position.
 (9)  S 714-025Make sure the PRESS light for the demand pump comes on.
 S 714-026

 (10)
 Make sure a temperature indication, for the applicable hydraulic system, shows on the EICAS status display.

 S 864-027

 (11)
 Remove electrical power if it is not necessary (AMM 24-22-00/201).

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