(m)  
Push the MENU key on the CDU.

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747-400 MAINTENANCE MANUAL
 ACMS DATA MANAGEMENT UNIT - REMOVAL/INSTALLATION
________________________________________________
 1.  General_______
 A.  Two tasks are in this procedure. The first task is the removal of the ACMS Data Management Unit (DMU). The second task is the installation of the ACMS DMU. The installation task includes a test to make sure the DMU operates.
 B.  The ACMS DMU is installed in the main equipment center on the E1-3 shelf.
 TASK 31-35-01-004-001
 2.  ACMS DMU Removal________________
 A.  References
 (1) AMM 20-11-22/401, Rack-Mounted Electrical/Electronic Module
 B.  Access
 (1)  
Location Zone
 117 Electrical/Electronic Compartment, LH

 (2)  
Access Panel
 117AL E/E Compartment Access Door

 C.  Procedure
 S 864-002
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P415 Power Distribution Center - Right 1) 415L38 ACMS AC
 S 024-003
 (2)  Remove the ACMS DMU (AMM 20-11-22/401).
 TASK 31-35-01-404-004
 3.  ACMS DMU Installation_____________________
 A.  References
 (1)  
AMM 20-11-22/401, Rack-Mounted Electrical/Electronic Module

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

 (3)  
AMM 31-35-10/201, ACMS Data Management Unit Software Installation

 (4)  
IPC 31-35-01

 B.  Access
 (1)  Location Zone
 117 Electrical/Electronic Compartment, LH

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747-400 MAINTENANCE MANUAL
 (2)  Access Panel
 117AL E/E Compartment Access Door

 C.  Procedure
 S 424-006
 (1)  
Install the ACMS DMU (AMM 20-11-22/401).

 S 864-013

 (2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  P415 Power Distribution Center - Right
 1) 415L38 ACMS AC

 S 424-021
 (3)  Install the Applications Software into the ACMS DMU, if it is necessary (AMM 31-35-10/201).
 D.  ACMS DMU Installation Test
 S 864-012
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 754-040

 (2)
Do these steps to do a software configuration check of the DMU:

 NOTE: You must know the correct software part numbers for the DMU.
____ For the DMU to be an approved installation, software with the correct part number must be installed.
 (a)  
Push the MENU key on the center CDU. 1) Make sure that the <ACMS prompt shows on the CDU menu.

 (b)  
Push the line select key adjacent to <ACMS.

 (c)  
Push the line select key adjacent to the prompt that causes the software part number to show (usually REPROGRAM, STATUS, or VERSIONS AND P/N).

 (d)  
Make sure the correct software part number shows.

 1)  If the part number is not correct, then do this task: ACMS Data Management Unit Software Installation (AMM 31-35-10/201) or replace the DMU.
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747-400 MAINTENANCE MANUAL
 S 744-042
 (3)  Use a CDU to do a ground test of the ACMS DMU:
　
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