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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

 (2)  
AMM 45-10-00/201, Central Maintenance Computer System

 (3)  
IPC 24-51-02 Fig. 1

 (4)  
IPC 24-51-02 Fig. 2

 (5)  
IPC 24-51-02 Fig. 3

 (6)  
IPC 24-51-02 Fig. 4

 (7)  
WDM 24-51-11, 24-51-21, 24-51-31, 24-51-41

 (8)  
SSM 24-51-01, 24-51-02, 24-51-03, 24-51-04

 B. Access
 (1)  
Location Zone
 117 Electrical and Electronics Compartment, LH
 118 Electrical and Electronics Compartment, RH

 (2)  
Access Panel
 P514 Generator 1 Power Center - Left
 P614 Generator 2 Power Center - Left
 P515 Generator 3 Power Center - Right
 P615 Generator 4 Power Center - Right

 C. Install the Utility Power Electrical Load Control Unit
 S 424-024
 (1)  
Install the ELCU:

 (a)  
Put the ELCU in its position in the applicable panel.

 (b)  
Install the four screws that attach the ELCU to the panel.

 (c)  
Tighten the screws.

 S 434-028
 (2)  
Connect the electrical leads to the ELCU:

 (a)  
Remove the screws that attach the terminal covers to the ELCU.

 (b)  
Remove the terminal covers.

 (c)  
Remove the nuts and the washers from the terminal studs on the ELCU.

 CAUTION: MAKE SURE YOU CONNECT THE CORRECT ELECTRICAL LEAD TO EACH
_______ STUD ON THE ELCU. AN INCORRECT INSTALLATION CAN CAUSE A MALFUNCTION OF THE CIRCUIT AND DAMAGE TO THE EQUIPMENT.
 (d)  Connect the electrical leads to the terminal studs on the ELCU.
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 CAUTION: DO NOT INSTALL THE WASHERS BELOW THE ELECTRICAL LEADS.
_______ THIS WILL CAUSE HEAT THAT CAN BURN THE STUDS ON THE ELCU.
 (e)  
Install the washers and the nuts on the terminal studs.

 (f)  
Torque the nuts to 120 +/- 5 inch-pounds.

 (g)  
Remove the identification tags from the electrical leads.

 (h)  
Put the terminal covers in their positions on the ELCU.

 (i)  
Install the screws that attach the terminal cover to the ELCU.

 (j)  
Tighten the screws.

 S 434-014
 (3)  Connect the applicable electrical connector to the ELCU.
 ~........................................ | Equipment Number | .......................................... | ELCU | Connector | Panel | .......................................... | M3250 | DM3250 | P514 | | M3251 | DM3251 | P614 | | M3252 | DM3252 | P515 | | M3253 | DM3253 | P615 | 2.............….............…............1
 S 414-015
 (4)  
Close the access door for the panel.

 D.
Do a Test of the Utility Power Electrical Load Control Unit

 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 714-025

 (2)  
Do a test of the ELCU:

 (a)  
Get access to the EXISTING FAULTS page for Chapter 24 (if any) on the CMCS (AMM 45-10-00/201).

 S 864-026
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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MAINTENANCE MANUAL

 (b)  
Make sure the CMCS messages for the utility power ELCUs do not show.
　
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