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 1.  General
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 A.  This procedure has two tasks. One task is the removal of the electrical-load control units (ELCU) (M3250, M3251, M3252, and M3253) for the utility power. The other task is the installation of the ELCU.
 B.  The utility power ELCUs are installed in the four generator power center panels P514, P515, P614, and P615. The panels are in the E/E compartment. Access to the E/E compartment is through the door behind the nose wheel or through the forward cargo compartment.
 TASK 24-51-05-004-001
 2.  Utility Power Electrical Load Control Unit Removal (Fig. 401)
__________________________________________________
 A.  References
 (1)
24-22-00/201, Manual Control

 (2)
IPC 24-51-02 Fig. 1

 (3)
IPC 24-51-02 Fig. 2

 (4)
IPC 24-51-02 Fig. 3

 (5)
IPC 24-51-02 Fig. 4

 (6)
WDM 24-51-11, 24-51-21, 24-51-31, 24-51-41

 (7)
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.  
Procedure

 (1)
Make sure all electrical power is off (Ref 24-22-00/201).

 S 864-003
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400 MAINTENANCE MANUAL
SEE B UTILITY POWER 1 ELCU (M3250)
SEE C
P514
SEE A
P614
UTILITY POWER 2 ELCU 
(M3251) 
SEE  C 
P514 and P614 GENERATOR 
1 and 2 POWER CENTER-LEFT 
UTILITY POWER 3 ELCU  A 
(M3252) 
SEE  C 

P515
P615
UTILITY POWER 4 ELCU (M3253)
SEE C
P515 and P615 GENERATOR 3 and 4 POWER CENTER-RIGHT
B
ELCU
(TYPICAL) C
Utility Power Electrical Load Control Unit Installation Figure 401
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 ALL  ú ú 01 Page 402 ú Oct 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 024-004
 (2)  Open the applicable panel to get access to the ELCU.
 ~........................................ | Equipment Number | .......................................... | ELCU | Connector | Panel | .......................................... | M3250 | DM3250 | P514 | | M3251 | DM3251 | P614 | | M3252 | DM3252 | P515 | | M3253 | DM3253 | P615 | 2.............….............…............1
 S 034-005
 (3)  
Disconnect the electrical connector from the ELCU.

 S 034-023

 (4)  
Disconnect the electrical leads from the ELCU:

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

 (b)  
Remove the terminal covers.

 (c)  
Remove the nuts and the washers that attach the electrical leads to the terminal studs on the ELCU.

 (d)  
Attach an identification tag to each electrical lead.

 (e)  
Remove the electrical leads from the terminal studs.

 S 024-022
 (5)  
Remove the ELCU:

 (a)  
Remove the four screws that attach the ELCU to the panel.

 (b)  
Remove the ELCU from the panel.

 (c)  
Install the terminal washers and the terminal nuts on the ELCU.

 TASK 24-51-05-404-010
 3.  Utility Power Electrical Load Control Unit Installation (Fig. 401)_______________________________________________________
 A. References
 (1)  24-22-00/201, Manual Control
　
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