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 C.  When a new CMC is installed, the fault history data and the option code in the other CMC are automatically transmitted to the new CMC. To keep the data with the airplane, replace only one CMC at a time.
 D.  The circuit breaker for the right CMC must be opened before the circuit breaker for the left CMC. This sequence of steps makes sure that CMCS messages from other flight legs do not show incorrectly as non-FDE faults in the present flight leg.
 E.  The CMCs (left and right) are installed in the main equipment center on shelf E1-4 of the electronic equipment rack.
 TASK 45-10-01-024-050
 2.  Central Maintenance Computer Removal____________________________________
 A.  References
 (1) AMM 20-11-22/401, Rack-Mounted Electrical/Electronic Module
 B.  Access
 (1)  Location Zone 117 Electrical and Electronics Compartment, LH
 C.  Procedure
 S 864-163
 (1)  Open these circuit breakers in the given sequence and attach DO-NOT-CLOSE tags:
 (a)  
P180 DC Power Distribution Panel
 1) 180D16 CMC-SW

 (b)  
P415 Power Distribution Center - Right Panel 1) 415L39 CMC RIGHT

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A
747-400
MAINTENANCE MANUAL

 

Central Maintenance Computer Location
Figure 401

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A
747-400 MAINTENANCE MANUAL
 (c)  P414 Power Distribution Center - Left Panel 1) 414L8 CMC LEFT
 S 024-052
 CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE CMC.
_______ IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE FROM YOUR BODY CAN CAUSE DAMAGE TO THE CMC.
 (2)  Remove the applicable CMC (AMM 20-11-22/401).
 TASK 45-10-01-424-165
 3. Central Maintenance Computer Installation
_________________________________________
 A. General
 (1)  To keep the fault history data and the CMC option code on the airplane, replace one CMC at a time.
 B. References
 (1)  
AMM 20-11-22/401, Rack-Mounted Electrical/Electronic Module

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

 (3)  
AMM 45-10-10/201, CMC Software Installation

 C. Access
 (1)  Location Zones 117 Electrical and Electronics Compartment, LH 221 Control Cabin, LH 222 Control Cabin, RH
 D. Procedure
 S 864-142
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-166

 (2)  
Make sure the captain's clock and the first officer's clock are set to the correct date and time (GMT |12 seconds).

 S 864-143

 (3)  
Make sure these circuit breakers are open with DO-NOT-CLOSE tags attached:

 NOTE: The circuit breakers must be opened in the given sequence.
____
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747-400 MAINTENANCE MANUAL
 (a)  P180 DC Power Distribution Panel 1) 180D16 CMC-SW
 (b)  P415 Power Distribution Center - Right Panel 1) 415L39 CMC RIGHT
 (c)  P414 Power Distribution Center - Left Panel 1) 414L8 CMC LEFT

 S 424-144
 CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE CMC.
_______ IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE FROM YOUR BODY CAN CAUSE DAMAGE TO THE CMC.
 (4)  
Install the replacement CMC (AMM 20-11-22/401).

 S 864-145
　
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