S 215-048

 (15)
 For hydraulic systems No. 1 and No. 4 only, do these steps:

 (a)  
Put the HYD PUMP DEMAND selector switch in the AUX position.

 (b)  
Make sure the AUX PUMP ON message shows on the EICAS SYNOPTIC display.

 (c)  
Put the HYD PUMPS DEMAND selector switch in the OFF position.

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747-400 MAINTENANCE MANUAL
 S 415-053
 (16) Close the doors on the trailing edge fairing (AMM 54-62-00/201).
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747-400 MAINTENANCE MANUAL
 HYDRAULIC INTERFACE MODULE (HYDIM) - REMOVAL/INSTALLATION
_________________________________________________________
 1.  General_______
 A.  This procedure has two tasks. The first task removes the hydraulic interface module (HYDIM). The second task installs the hydraulic interface module (HYDIM). The second task also contains a test procedure for the HYDIM.
 B.  The hydraulic interface module (HYDIM) is on the left side of the nose gear wheel well, in the main equipment center. The HYDIM has four circuit cards in the electrical systems card file, M7603. There is one circuit card for each hydraulic system.
 C.  The circuit cards are interchangeable between the hydraulic systems.
 TASK 29-11-42-004-001
 2.  Hydraulic Interface Module (HYDIM) Removal (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 45-10-00/201, Central Maintenance Computer System

 B.  
Access

 (1)  
Location Zone
 117 Main Equipment Center

 C.  
Make a Record of the Shop Faults for the Hydraulic Interface Module (HYDIM)

 NOTE: This procedure is optional.
____ S 864-028
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-029

 (2)  
Do the Display of Shops Faults procedure for the HYDIM (AMM 45-10-00/201).

 S 974-030

 (3)  
Make a record of the shop faults for the HYDIM:

 (a)  
Make a selection of 29 HYDRAULICS from the shop faults menu.

 (b)  
Make a selection of HYDIM-1, HYDIM-2, HYDIM-3, or HYDIM-4 for the applicable hydraulic system.

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747-400
MAINTENANCE MANUAL

CIRCUIT CARDS FOR THE HYDRAULIC INTERFACE MODULE (HYDIM)
ELECTRICAL SYSTEMS CARD FILE, M7603
SEE A
ELECTRICAL SYSTEMS CARD FILE, M7603
A

Hydraulic Interface Module (HYDIM) Installation
Figure 401

FWD
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 (c)  
Make a record of the shop faults which come into view.

 (d)  
If the shop faults do not show, make a selection of the applicable HYDIM again, until the shop fault page comes into view.
　
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