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747-400 MAINTENANCE MANUAL
 HYDRAULIC INTERFACE MODULE (HYDIM) - ADJUSTMENT/TEST
____________________________________________________
 1.  General_______
 A.  This procedure has one task. This task does a ground test of the hdraulic interface module (referred to as the HYDIM). No adjustment of the HYDIM is possible.
 B.  The (HYDIM) is an electrical circuit card installed in the M7603 electrical systems card file. The M7603 electrical systems card file is located in the main equipment center on the left side of the nose gear wheel well.
 C.  The HYDIM ground test is a complete self test of the HYDIM circuit card . The test is performed upon receipt of command from the central maintenance computer. If a failure of the test occurs the HYDIM sets and latches the HYDIM fault discrete. Upon completion of the test HYDIM will automatically transmit shop relevant fault messages/codes to the central maintenance computer for storage and retrieval.
 TASK 29-11-42-745-001
 2.  Hydraulic Interface Module (HYDIM) Ground Test______________________________________________
 A.  General
 (1)  
This is a test of the BITE functions of the HYDIM.

 B.  
References

 (1)  
AMM 24-22-00/201, Manual Control

 C.  
Access

 (1)  
Location Zone
 221 Control Cabin
 222 Control Cabin

 D.  
Prepare for the Test

 S 865-002
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-004

 (2)  
Prepare the CDU for the test:

 (a)  
Push the MENU key on the CDU to show the MENU.

 (b)  
Push the line select key (LSK) that is adjacent to <CMC to show the CMC MENU.

 (c)  
If <RETURN shows after you push the LSK, push the LSK that is adjacent to <RETURN until you see the CMC MENU.

 (d)  
Push the LSK that is adjacent to <GROUND TESTS to show the GROUND TESTS menu.

 (e)  
Push the NEXT PAGE key until you find <29 HYDRAULIC POWER.

 (f)  
Push the LSK that is adjacent to <29 HYDRAULIC POWER to show the GROUND TESTS menu for the hydraulic system.

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747-400 MAINTENANCE MANUAL
 (g)  
Push the NEXT PAGE key until you find <HYDIM-1, -2, -3, or -4.

 E.  
HYDIM Ground Test

 S 745-005
 (1)  Push the LSK that is adjacent to the applicable prompt
 (<HYDIM-1, -2, -3, or -4).

 NOTE: IN PROGRESS shows during the test.
____
 S 745-006
 (2)  When IN PROGRESS goes out of view, look for PASS or FAIL> adjacent to <HYDIM-1, -2, -3, or -4.
 NOTE: If a PASS indication shows, no failures occured during
____
 the test.

 (a)  If FAIL> shows: 1) Push the LSK that is adjacent to FAIL> to see the GROUND TEST MSG pages for the failure. 2) Push the NEXT PAGE key until you find all the GROUND TEST MSG pages. 3) Make a list of all CMCS messages, CMCS message numbers, and ATA numbers that show on the GROUND TEST MSG pages.
 4)  Go to the CMCS Message Index of the Fault Isolation Manual (FIM) to find the corrective action for each CMCS message.
 F.  Put the Airplane in Its Usual Condition.
 S 865-008
 (1)  Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

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2.

3.

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747-400 MAINTENANCE MANUAL
 HYDRAULIC RESERVOIR PRESSURIZATION SYSTEM - DESCRIPTION AND OPERATION
　
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